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@article{2292767, author = {Dassie, PierreandIgor and Haddad, Ryma and Lenez, Maud and Chaumonnot, Alexandra and Boualleg, Malika and Legriel, Patrick and Stýskalík, Aleš and Haye, Bernard and Selmane, Mohamed and Debecker, Damien P and Sanchez, Clement and Chaneac, Corinne and Boissiere, Cedric}, article_number = {7}, doi = {http://dx.doi.org/10.1039/d2gc04714d}, language = {eng}, issn = {1463-9262}, journal = {Green Chemistry}, note = {Neodvádět do RIV. Autoři článku nemají afiliaci k MU.}, title = {Coupling of solvent-free synthesis and reactive extrusion of alumina: an ecologically efficient integration for heterogenous catalyst synthesis}, url = {https://doi.org/10.1039/D2GC04714D}, volume = {25}, year = {2023} }
TY - JOUR ID - 2292767 AU - Dassie, Pierre-Igor - Haddad, Ryma - Lenez, Maud - Chaumonnot, Alexandra - Boualleg, Malika - Legriel, Patrick - Stýskalík, Aleš - Haye, Bernard - Selmane, Mohamed - Debecker, Damien P - Sanchez, Clement - Chaneac, Corinne - Boissiere, Cedric PY - 2023 TI - Coupling of solvent-free synthesis and reactive extrusion of alumina: an ecologically efficient integration for heterogenous catalyst synthesis JF - Green Chemistry VL - 25 IS - 7 SP - 2800-2814 EP - 2800-2814 PB - Royal Society of Chemistry SN - 14639262 N1 - Neodvádět do RIV. Autoři článku nemají afiliaci k MU. UR - https://doi.org/10.1039/D2GC04714D N2 - Innovation in materials manufacturing processes is a challenge to reduce the environmental impact of the chemical industry in line with sustainable development objectives, such as promoting sustainable industrialization and ensuring responsible consumption and production patterns. One of the ways to reach this goal is to revisit the main synthesis processes and to rethink their use. Reactive extrusion is a well-known continuous process used to produce and shape various materials in the polymer and food industries, but hardly leads to the direct synthesis and shaping of metal oxide materials (ceramics). In contrast, sol-gel chemistry offers tremendous opportunities to synthesize metal oxide networks by polycondensation of molecular precursors at a low temperature, but it is mostly operated in sluggish batch processes, using massive amounts of solvent contaminants and producing large amounts of chemical waste (E-factor > 40). In this work, for the first time, we coupled extrusion with sol-gel chemistry to produce high surface area shaped alumina-based materials that meet or exceed the requirements to be used as heterogeneous catalysts or catalyst supports. The necessity to adapt sol-gel chemistry - usually done in a diluted environment - to meet the twin-extruder technical constraints - usually working in a viscous environment - led to a peculiar choice of reaction conditions little discussed in the literature: the hydrolysis/condensation of (solid) alkoxide precursors without a solvent. We were able to synthesize and shaped high specific surface area boehmite (gamma-AlOOH) at room temperature, in a continuous mode, and under solvent-free conditions. The solids are directly shaped in the form of self-standing "spaghetti" or extrudates. Upon calcination, the shaped hydroxides are converted into mesoporous and high specific surface area gamma alumina (gamma-Al2O3) materials. We show that such materials exhibit high catalytic activity in the dehydration of ethanol. The process intensification presented here paves the way towards very low-waste, low-energy, and - all in all - more sustainable manufacturing practices for shaped high surface area metal oxides. In addition, it could be potentially less expensive since the simplification of the equipment and the lower energy consumption will contribute to drastically reduce the production costs even if the reagents are more expensive. ER -
DASSIE, Pierre-Igor, Ryma HADDAD, Maud LENEZ, Alexandra CHAUMONNOT, Malika BOUALLEG, Patrick LEGRIEL, Aleš STÝSKALÍK, Bernard HAYE, Mohamed SELMANE, Damien P DEBECKER, Clement SANCHEZ, Corinne CHANEAC a Cedric BOISSIERE. Coupling of solvent-free synthesis and reactive extrusion of alumina: an ecologically efficient integration for heterogenous catalyst synthesis. \textit{Green Chemistry}. Royal Society of Chemistry, 2023, roč.~25, č.~7, s.~2800-2814. ISSN~1463-9262. Dostupné z: https://dx.doi.org/10.1039/d2gc04714d.
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