Ivanova Svetlana, Vanhaecke Estelle, Louis Benoit, Libs Suzanne, Ledoux Marc-Jacques, Rigolet Sévérine, Marichal Claire, Pham Charlotte, Luck Francis, Pham-Huu Cuong
Laboratoire des Matériaux Surfaces et Procédés pour la Catalyse, UMR 7515 du CNRS, Université Louis Pasteur, European Laboratory of Catalysis and Surface Sciences (ELCASS), 25 rue Becquerel, 67087 Strasbourg, France.
ChemSusChem. 2008;1(10):851-7. doi: 10.1002/cssc.200800024.
In this study, we aimed to produce a highly selective and stable catalyst for the production of dimethyl ether by methanol dehydration. The activities were compared of different active phases of the employed system, zeolite HZSM-5 or gamma-alumina, supported on silicon carbide as foam, and it was found that the supported zeolite catalysts are more active than and as selective as the alumina-based catalysts. The as-prepared zeolite/SiC composites reveal good stability in long-term tests in the presence or absence of steam. The high stability is attributed to the presence of highly dispersed micrometer-sized zeolite particles, which make the active sites more accessible to the reactants and promote the quick transfer of the desired product, dimethyl ether, out of the catalyst bed, minimizing deactivation of the catalyst.
在本研究中，我们旨在制备一种用于甲醇脱水制二甲醚的高选择性和稳定的催化剂。比较了以泡沫碳化硅为载体的所用体系（沸石HZSM-5或γ-氧化铝）不同活性相的活性，发现负载型沸石催化剂比氧化铝基催化剂更具活性且选择性相当。所制备的沸石/碳化硅复合材料在有或无蒸汽存在的长期测试中显示出良好的稳定性。高稳定性归因于存在高度分散的微米级沸石颗粒，这些颗粒使活性位点更容易被反应物接触，并促进所需产物二甲醚快速从催化剂床层中转移出来，从而使催化剂失活最小化。
