Confining Pore‐mouth: an Efficient Way to Increase the Selectivity to Ethylene in the MTO Reaction,ChemCatChem

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Confining Pore‐mouth: an Efficient Way to Increase the Selectivity to Ethylene in the MTO Reaction
ChemCatChem ( IF 3.8 ) Pub Date : 2020-10-03 , DOI: 10.1002/cctc.202001241
Jiajia Ding ₁ , Xuefeng Shen ₁ , Jian Zhou ₁ , Yingchun Ye ₁ , Hongxing Liu ₁ , Zaiku Xie ₂

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The chemical liquid deposition modification can decorate the pore aperture size by external surface deposition, which is a very efficient way to further improve the shape‐selective performance of zeolites. Here, SAPO‐34 zeolite was modified with silica by chemical liquid deposition, and then was applied in MTO reaction. It was found the Brønsted acid of SiO₂‐modified SAPO‐34 zeolite increased, mainly due to the transformation from Al‐OH to Si‐OH‐Al, which can promote the selectivity to light olefins in MTO reaction. After the chemical liquid deposition, the silica located on the external surface of SAPO‐34 zeolite, reduces the apparent diffusion coefficient of propylene, which will restrain the formation and diffusion of propylene. So the selectivity to ethylene and the ratio of ethylene to propylene were significantly increased over the SiO₂‐modified SAPO‐34 in the MTO reaction. Furthermore, the increase of the reactive sites can prolong the lifetime of catalyst effectively.

中文翻译：

限制孔口：提高MTO反应中乙烯选择性的有效方法

化学液体沉积改性可以通过外表面沉积来修饰孔径大小，这是进一步提高沸石的形状选择性能的非常有效的方法。在这里，SAPO-34沸石通过化学液体沉积法用二氧化硅改性，然后应用于MTO反应。发现SiO ₂的布朗斯台德酸经预改性的SAPO-34沸石增加，主要是由于从Al-OH向Si-OH-Al的转变，这可以促进MTO反应中对轻烯烃的选择性。化学液体沉积后，位于SAPO-34沸石外表面的二氧化硅会降低丙烯的表观扩散系数，这会限制丙烯的形成和扩散。因此，在MTO反应中，与SiO ₂改性的SAPO-34相比，对乙烯的选择性和乙烯与丙烯的比率显着提高。此外，反应位点的增加可以有效地延长催化剂的寿命。

更新日期：2020-10-03

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