Kubarev Alexey V, Breynaert Eric, Van Loon Jordi, Layek Arunasish, Fleury Guillaume, Radhakrishnan Sambhu, Martens Johan, Roeffaers Maarten B J
Center for Surface Chemistry and Catalysis, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium.
ACS Catal. 2017 Jul 7;7(7):4248-4252. doi: 10.1021/acscatal.7b00782. Epub 2017 May 22.
Molecular-sized micropores of ZSM-5 zeolite catalysts provide spatial restrictions around catalytic sites that allow for shape-selective catalysis. However, the fact that ZSM-5 has two main pore systems with different geometries is relatively unexploited as a potential source of additional shape selectivity. Here, we use confocal laser-scanning microscopy to show that by changing the polarity of the solvent, the acid-catalyzed furfuryl alcohol oligomerization can be directed to selectively occur within either of two locations in the microporous network. This finding is confirmed for H-ZSM-5 particles with different Si/Al ratios and indicates a general trend for shape-selective catalytic reactions.
ZSM-5沸石催化剂的分子尺寸微孔在催化位点周围提供了空间限制，从而实现择形催化。然而，ZSM-5具有两种不同几何形状的主要孔道系统这一事实，作为额外择形选择性的潜在来源，尚未得到充分利用。在此，我们使用共聚焦激光扫描显微镜表明，通过改变溶剂的极性，酸催化的糠醇低聚反应可以被引导至在微孔网络的两个位置中的任意一个位置选择性地发生。对于具有不同硅铝比的H-ZSM-5颗粒，这一发现得到了证实，并表明了择形催化反应的一般趋势。
