Glycerol is an attractive bio-based platform chemical that can be converted to a variety of bio-based chemicals. We here report a catalytic co-conversion strategy where glycerol in combination with a second (bio-)feed (fatty acids, alcohols, alkanes) is used for the production of bio-based aromatics (BTX). Experiments were performed in a fixed bed reactor (10 g catalyst loading and WHSV of (co-)feed of 1 h-1) at 550 °C using a technical H-ZSM-5/Al2O3 catalyst. Synergistic effects of the co-feeding on the peak BTX carbon yield, product selectivity, total BTX productivity, catalyst life-time, and catalyst regenerability were observed and quantified. Best results were obtained for the co-conversion of glycerol and oleic acid (45/55 wt%), showing a peak BTX carbon yield of 26.7 C%. The distribution of C and H of the individual co-feeds in the BTX product was investigated using an integrated fast pyrolysis-GC-Orbitrap MS unit, showing that the aromatics are formed from both glycerol and the co-feed. The results of this study may be used to develop optimized co-feeding strategies for BTX formation. This journal is
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The catalytic conversion of glycerol to aromatics (GTA, e.g., benzene, toluene, and xylenes, BTX) over a shaped H-ZSM-5/Al2O3 (60/40 wt%) catalyst was investigated in a continuous fixed-bed reactor to study the addition of the Al2O3 binder in the catalyst formulation on catalyst performance. The experiments were performed under N2 at 550 °C, a WHSV of glycerol (pure) of 1 h−1, and atmospheric pressure. The spent H-ZSM-5/Al2O3 catalysts were reused after an oxidative regeneration at 680 °C and in total 5 reaction-regeneration cycles were performed. Catalyst characterization studies show that the addition of the Al2O3 binder does not affect the surface area and crystallinity of the formulation, but increases the total pore volume (mesopores in particular) and total acidity (Lewis acidity in particular). The H-ZSM-5/Al2O3 (60/40 wt%) catalyst shows a considerably prolonged catalyst life-time (8.5 vs. 6.5 h for H-ZSM-5), resulting in a significant increase in the total BTX productivity (710 vs. 556 mg g−1 H-ZSM-5). Besides, the addition of the Al2O3 binder retards irreversible deactivation. For instance, after 3 regenerations, catalyst performance is comparable to the fresh one. However, after 4 regenerations, some irreversible catalyst deactivation occurs, associated with a reduction in total pore volume, crystallinity, and acidity (Brønsted acidity in particular), and meso-porosity of the Al2O3 binder. This study shows that both the stability and reusability of H-ZSM-5-based catalysts for GTA are remarkably enhanced when using a suitable binder.
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Abstract of a lecture that was held on the annual congress of AESOP (Association of European Schools of Planning) in 2014.
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The scope of this thesis of Gerrit Bouwhuis, lecturer at Saxion Research Centre for Design and Technology in Enschede is the development of a new industrial applicable pre-treatment process for cotton based on catalysis. The pre-treatment generally consists of desizing, scouring and bleaching. These processes can be continuous or batch wise. Advances in the science of biocatalytic pre-treatment of cotton and catalytic bleaching formed the scientific basis for this work. The work of Agrawal on enzymes for bio-scouring and of Topalovic on catalytic bleaching led to the conclusion that reduced reaction temperatures for the pre-treatment processes of cotton are possible. A second reason for the present work is a persistent and strong pressure on the industry to implement ‘more sustainable’ and environmental friendlier processes. It was clear that for the industrial implementation of the newly developed process it would be necessary to ‘translate’ the academic knowledge based on the catalysts, into a process at conditions that are applicable in textile industry. Previous experiences learned that the transition from academic knowledge into industrial applicable processes often failed. This is caused by lack of experience of university researchers with industrial product and process development as well as a lack of awareness of industrial developers of academic research. This is especially evident for the so-called Small and Medium Enterprises (SME’s). To overcome this gap a first step was to organize collaboration between academic institutes and industries. The basis for the collaboration was the prospect of this work for benefits for all parties involved. A rational approach has been adopted by first gathering knowledge about the properties and morphology of cotton and the know how on the conventional pre-treatment process. To be able to understand the conventional processes it was necessary not only to explore the chemical and physical aspects but also to evaluate the process conditions and equipment that are used. This information has been the basis for the present lab research on combined bio-catalytic desizing and scouring as well as catalytic bleaching. For the measurement of the performance of the treatments and the process steps, the performance indicators have been evaluated and selected. Here the choice has been made to use industrially known and accepted performance indicators. For the new bio-catalytic pre-treatment an enzyme cocktail, consisting of amylase, cutinase and pectinase has been developed. The process conditions in the enzyme cocktail tests have been explored reflecting different pre-treatment equipment as they are used in practice and for their different operation conditions. The exploration showed that combined bio-catalytic desizing and scouring seemed attractive for industrial application, with major reduction of the reaction and the rinsing temperatures, leading to several advantages. The performance of this treatment, when compared with the existing industrial treatment showed that the quality of the treated fabric was comparable or better than the present industrial standard, while concentrations enzymes in the cocktail have not yet been fully optimized. To explore the application of a manganese catalyst in the bleaching step of the pre-treatment process the fabrics were treated with the enzyme cocktail prior to the bleaching. It has been decided not to use conventional pre-treatment processes because in that case the combined desizing and scouring step would not be integrated in the newly developed process. To explore catalytic bleaching it has been tried to mimic the existing industrial processes where possible. The use of the catalyst at 100°C, as occurs in a conventional steamer, leads to decomposition of the catalyst and thus no bleach activation occurs. This led to the conclusion that catalytic bleaching is not possible in present steamers nor at low temperatur
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Stricter environmental policies, increased energy prices and depletion of resources are forcing industries to look for bio-based and low carbon footprint products. For industries, flax is interesting resource since it is light, strong, environmental friendly and renewable. From flax plant to fiber products involves biochemical and mechanical processes. Moreover, production and processing costs have to compete with other products, like petroleum based materials. This research focusses on sustainable process improvement from flax plant to fiber production. Flax retting is a biological process at which mainly pectin is removed. Without retting, the desired fibre remains attached to the wooden core of the flax stem. As a result, the flax fibres cannot be gained, or have a lows quality. After retting, the fibers are released from the wooden core. Furthermore, machines have been introduced in the flax production process, but the best quality fibers are still produced manually. Due to the high labor intensity the process is too expensive and the process needs to be economical optimized. Since the retting process determines all other downstream processes, retting is the first step to focus on. Lab-scale experiments were performed to investigate the retting process. Factors that were researched were low cost processing conditions like, temperature, pH, dew retting and water retting. The retting rate was low, around three weeks for complete retting. The best retting conditions were at 20°C with water and any addition of chemicals. The process could be shortened to two weeks by recycling the water phase. In a scale-up experiment, a rotating drum was used at the optimal conditions from the lab-experiment (20°C and water). First the flax did not mix with the water content in the rotating drum. The flax was too rigid and did not tumble. Therefore, bundles of flax plants were used. The inner core of the bundle seemed to be protected and the retting rate was less compared to the flax on the surface of the flax bundle. This implies that mechanical impact increased retting in the rotating drum, however heterogeneous retting should be avoided. To overcome the heterogeneous retting problem, a water column was used to improve heterogeneous retting. Retting was performed in a water column and mixing was accomplished by bubbling air. As a result of the mixing, the flax bundle was retted homogenously. And after drying, it was possible to separate the fibers from the wooden flax core. Retting with a bubble column can overcome this problem and seems to be a usable retting process step. Water samples of the lab-scale experiments, the rotating drum and the bubble column showed a chemical oxygen demand (COD) content up to 4 g/L. Overall, 1 kg Flax resulted in 40 g COD. This indicates the possibility to produce biogas that can be used for generating heat and electricity, to make the process sustainable. Around 50% of the weight consists of wooden shives. The shives can be used for pyrolysis and it was possible to produce around 30% coal and 20% oil. These compounds can be used as building blocks, but also to generate heat and electricity. Heat and electricity can be used for the flax processing. Shives were only dried for 1 day at 105°C and slow pyrolysis was used. This indicates that a higher yield can be expected at fast pyrolysis. Overall, the reported implicates that quality fiber production from flax plant can be a feasible, sustainable and a renewable production process. Feasibility of the process can be obtained by, (1) retting at low-cost process conditions of 20°C and using water without any addition of chemicals, (2) with increased flax retting rate by recycling water, (3) with increased flax retting rate by introducing mixing forces, and the ability to lower the energy consumption of the overall process, (4) producing biogas from the COD with anaerobic digestion and (5) producing pyrolysis oil and pyrolysis c
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Bio-based and circular building materials and techniques can play an important role in the transition toward a more sustainable construction sector. This study focuses on the Northern Netherlands and explores those competencies (in terms of knowledge, skills, and attitude) required by construction workers to meet thechallenges of material transition. The perspectives on this topic of construction companies, vocational education institutions, and local networking initiatives have been collected and analyzed by using the thematic analysis method. The results indicate that the limited knowledge availability, combined with the restricted experimentation possibilities, shape the current experiences, as well as the positioning of these stakeholders, regarding the desired competencies of construction workers. It is found that mainly attitudinal aspects of the construction workers need to receive particular attention and prioritization. To achieve that, the results highlight the importance of knowledge exchange and awareness-raising initiatives, as well as the development of a flexible, regional, and comprehensive learning environment.
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Sustainable urban drainage systems (SuDS) or nature-based solutions (NBSs) are widely implemented to collect, store and infiltrate stormwater. The buildup of pollutants is expected in NBSs, and Dutch guidelines advise monitoring the topsoil of bio-swales every 5 years. In the Netherlands, almost every municipality has implemented bio-swales. Some municipalities have over 300 bio-swales, and monitoring all their NBSs is challenging due to cost and capacity. In this study, 20 locations where bio-swales with ages ranging between 10 and 20 years old were selected for a field investigation to answer the following question: is the soil quality of bio-swales after 10 years still acceptable? Portable XRF instruments were used to detect potential toxic elements (PTEs) for in situ measurements. The results showed that for copper (Cu), zinc (Zn) and lead (Pb), 30%, 40% and 25% of the locations show values above the threshold and 5%, 20% and 0% above the intervention threshold, meaning immediate action should be taken. The results are of importance for stakeholders in (inter)national cities that implement, maintain, and monitor NBS. Knowledge of stormwater and soil quality related to long-term health risks from NBS enables urban planners to implement the mostappropriate stormwater management strategies. With these research results, the Dutch guidelines for design, construction, and maintenance can be updated, and stakeholders are reminded that the monitoring of green infrastructure should be planned and executed every 5 years.
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Much research effort is invested in developing enzymatic treatments of textiles by focusing on the performance of enzymes at the laboratory scale. Despite all of this work, upgrading these developments from the laboratory scale to an industrial scale has not been very successful.Nowadays,companies are confronted with rapid developments of markets, logistics, and social and environmental responsibilities. Moreover, these organizations have to supply an ever-increasing amount of information to the authorities, shareholders, lobbyists, and pressure groups. Companies have tried to fulfill all of these demands, but this has often led to the loss of focus on new products and process development. However, both theory and practices of breakthrough innovations have shown that those rightfully proud of previous successes are usually not the ones that led the introduction of new technology, as shown and excellently documented by Christensen [1]. The textile industry is no exception to this observation.With the lack of management impetus for new product and process developments, companies began to reduce investments in these activities.However, this results in a reduction of the size of the company or even closure. Besides the hesitation from the top management of textile companies to focus on new developments,middle management level is also reluctant to evaluate and implement developments in new products and processes. One of the reasons for this reluctance is that many processes in the textile industry are notfully explored or known. From this lack of knowledge, it is easy to explain that there is hesitation for change, since not all consequences of a change in processing or production can be predicted. Often new developments cannot be fully tested and evaluated on the laboratory- or pilot-scale level.This is caused by the impossibility of mimicking industrial-scale production in a laboratory.Additionally, pilot-scale equipment is very expensive and for many companies it is not realistic to invest in this type of equipment. Fortunately an increasing number of textile companies have realized that they have to invest in new products and processes for their future survival and prosperity. New developments are decisive for future successes. If such companies decide to invest in new developments, it is clear that with the scarcity of capital for product and process developments, the chance of failure should be minimized. For successful process and product development, it is necessary to organize the development process with external partners because it is clear that it is almost impossible for individual textile companies to control the process from idea generation to academic research, implementation research, and development and industrial testing. These issues are especially characteristic for small- and medium-sized enterprises (SMEs). Herein, the collaboration has been organized on two research levels. The first research level is knowledge and know-how based. The universities and chemical suppliers worked closely together to investigate the new process.The aim was to explore the influence of process conditions and interactions of chemicals in sub-process steps as a result of the treatment.The second level is that of the industrial implementation of the new process. The universities and chemical suppliers worked closely together with different industries to implement the newly developed process. The focus in this part of the research was the interaction between the chemistry of the new process, equipment, and fabrics. A co-operation between the beneficiaries of the new process was established.The selection criterion for the co-peration was “who will earn something with the new process”. To answer this question, the value chain has been drawn as the simplified scheme shown in Fig. 1 [2].
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Abstract: Aureobasidium is omnipresent and can be isolated from air, water bodies, soil, wood, and other plant materials, as well as inorganic materials such as rocks and marble. A total of 32 species of this fungal genus have been identified at the level of DNA, of which Aureobasidium pullulans is best known. Aureobasidium is of interest for a sustainable economy because it can be used to produce a wide variety of compounds, including enzymes, polysaccharides, and biosurfactants. Moreover, it can be used to promote plant growth and protect wood and crops. To this end, Aureobasidium cells adhere to wood or plants by producing extracellular polysaccharides, thereby forming a biofilm. This biofilm provides a sustainable alternative to petrol-based coatings and toxic chemicals. This and the fact that Aureobasidium biofilms have the potential of self-repair make them a potential engineered living material avant la lettre. Key points: •Aureobasidium produces products of interest to the industry •Aureobasidium can stimulate plant growth and protect crops •Biofinish of A. pullulans is a sustainable alternative to petrol-based coatings •Aureobasidium biofilms have the potential to function as engineered living materials.
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A lot of research effort is put in developing enzymatic treatment of textiles by focusing on the performance of enzymes on lab-scale. Despite all this work upgrading of these developments from lab-scale to industrial scale has not been really successful. Companies are nowadays confronted with rapid developments of markets, logistics and social and environmental responsibilities. Moreover these organizations have to supply an evenincreasing amount of information to the authorities, shareholders, lobbyists and pressure groups. Companies have tried to fulfill all these demands, but this led often to the loss of focus on new product and process development. However, both theory and practices of breakthrough innovations has shown that those rightfully proud on previous successes in the past, are usually not the ones that lead the introduction of new technology, aswas shown and excellently documented by Harvard professor Clayton Christensen [Christenson, 2003]. The textile industry is no exception in this observation. With the lack of management impulses on new product and process developments companies began to reduce the investments in these activities. Finally, however, this will result in a reduction of the size of the company or even closing down. Besides the hesitation from the topmanagement of textile companies to focus on new developments it is also seen that the middle management level is reluctant to evaluate and implement developments in new products and processes. One of the reasons for this reluctance is that many processes in textile industry are not fully explored and known yet. From this lack of knowledge it is easy to explain that there is hesitation for changes, since not all consequences of a change inprocessing or production can be overseen. Often new developments cannot be fully tested and evaluated on labor pilot scale level. This is caused by the impossibility to mimic industrial scale production in a lab. Besides of that, pilot scale equipment is very expensive and for many companies it is not realistic to invest in this type of equipment.Fortunately an increasing number of textile companies realize that they have to invest in new products and processes for their future survival and prosperity. New developments are decisive for future successes. If such companies decide to invest in new developments it is obvious that with the scarcity of capital for product- and process developments, the chance of failures should be minimized. For successful process- and product development it is necessary to organize the development process with external partners, as it is clear that it is almost not possible for individual textile companies to control the process from idea generation, academic research, implementation research and development and industrial testing. These issues are specially characteristic for small and medium sized enterprises (SME’s). In the present work the collaboration has been organized on two research levels. The first research level is knowledge and know-how based. Here the universities and the chemical supplier worked closely together to investigate the new process. The aim was to explore the influence of process conditions and interaction of the chemicals in the sub process steps on the result of the treatment. The second level is that of the industrialimplementation of the new process. Here universities and chemical supplier worked closely together with different industries to implement the newly developed process. The focus in this part of the research was the interaction between the chemistry of the new process, equipment and fabrics.A co-operation between the beneficiaries of the new process has been established. The selection criterion for the co-operation was “who will earn something with the new process”. Paper from the Saxion Research Centre for Design and Technology for Proceedings of IPTB Conference, Milan, Italy, M
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