The surplus production of glycerol as a by-product of biodiesel has become a serious problem for the sustainability of the biodiesel industry. Glycerol dehydration over MFI zeolites offers a green route to acrolein production. However, conventional MFI zeolites suffer diffusion limitation, which inhibits accessibility to active sites and causes quick deactivation of catalysts because of severe coke deposition. In this study, self-pillared MFI nanosheet catalysts were prepared with different Si/Al ratios to catalyze glycerol dehydration. The nanosheets with interlayered meso-space possessing wide a,c-planes of ∼2 nm thickness in the b-axis provide a shortened diffusion pathway to easily access the active acid sites. In contrast to conventional MFI zeolites, the nanosheet morphology significantly enhanced the catalyst selectivity, activity, and stability; gave a high acrolein selectivity (92%) at a higher WHSV of 4 h^–1; and remained stable after up to 100 h of the reaction of 5% glycerol in water.

中文翻译：

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自爆MFI型沸石纳米片作为甘油脱水为丙烯醛的选择性催化剂

作为生物柴油副产物的甘油的过剩生产已经成为生物柴油工业可持续性的严重问题。MFI沸石上的甘油脱水为丙烯醛生产提供了一条绿色途径。但是，常规的MFI沸石受到扩散限制，由于严重的焦炭沉积，抑制了活性位的可及性，并使催化剂快速失活。在这项研究中，制备了具有不同Si / Al比的自堆积MFI纳米片状催化剂，以催化甘油脱水。具有层间介观空间的纳米片在b处具有约2 nm厚的a，c平面轴提供了缩短的扩散途径，可轻松访问活性酸位点。与常规的MFI沸石相比，纳米片形态显着提高了催化剂的选择性，活性和稳定性。在4 h ^–1的较高WHSV下，具有较高的丙烯醛选择性（92％）；并在5％甘油在水中反应100小时后仍保持稳定。