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Effect of different SAPO-34 film thickness on coke resistance performance of SAPO-34/ZSM-5/quartz film in MTA reaction

2023; Elsevier BV; Volume: 145; Linguagem: Inglês

10.1016/j.jtice.2023.104819

1876-1089

Ruizhi Chu, Bangming Yang, Yang Zhou, Jiaxin Wu, Pengcheng Li, Mingzhi Dai, Xianliang Meng, Xiao Li, Weisong Li, Guoguang Wu, Chenxiao Wang,

Catalytic Processes in Materials Science

3 Brief informative subheadings: SAPO-34 film thickness, Coke deposition analysis, Rich hierarchical pores. Composite zeolite film had a shorter lifetime due to the easy deactivation of SAPO-34. We explored the effect of SAPO-34 film thickness on anti-coking performance of composite zeolite film. Three SAPO-34/ZSM-5/quartz films with different SAPO-34 film thicknesses were prepared for MTA reaction. TG, N2 isothermal adsorption-desorption, XPS, FTIR, and GC-MS were used to explore the content, location, and composition of coke formed on the composite zeolite film. The deactivation behaviors of three catalysts were comparatively analyzed. The results showed the change in SAPO-34 film thickness could affect the reactivity. The zeolite with the SAPO-34 film thickness of 8 μm had excellent coke resistance performance because of the reasonable acid distribution and rich hierarchical pores. This could improve their coke-holding capacity and hinder the formation of graphite-like carbon. The analysis of coke species indicated that the intermediate products of the composite film were mostly tetrasubstituted methylbenzene. And the composite zeolite film with medium-thickness SAPO-34 film had the simplest composition of soluble coke, such as bicyclic or tricyclic aromatic hydrocarbons. This provided a new idea for improving the anti-coking performance of composite material.