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Spatial confinement effects of cage-type SAPO molecular sieves on product distribution and coke formation in methanol-to-olefin reaction

2013; Elsevier BV; Volume: 46; Linguagem: Inglês

10.1016/j.catcom.2013.11.016

1873-3905

Jingrun Chen, Jinzhe Li, Yingxu Wei, Cuiyu Yuan, Bing Li, Shutao Xu, You Zhou, Jinbang Wang, Mozhi Zhang, Zhongmin Liu,

Catalysis and Oxidation Reactions

Three kinds of 8-membered ring silicoaluminophosphate (SAPO) molecular sieves with different cage structures, SAPO-34, SAPO-18 and SAPO-35, were employed in methanol-to-olefin (MTO) reaction. The main products over SAPO-34 and SAPO-18 were propene and butenes, whereas ethene and propene especially ethene were predominantly generated over SAPO-35. Coke species formation greatly depended on reaction temperature and varied systematically with cage size. The differences in production distribution and generated coke species in the MTO reaction suggest great spatial confinement effects imposed by cage structure of SAPO catalysts.