石油化工2025，Vol.54Issue(3)：304-310,7.DOI:10.3969/j.issn.1000-8144.2025.03.002
溶剂分子在失活ZSM-5催化剂中的扩散行为
Diffusion behavior of solvent molecules in deactivated ZSM-5 catalyst
吕正忠 1常素萍 1凌嘉俊 1王礼云 1卜令坤1
作者信息
- 1. 国家能源集团 宁夏煤业煤制油化工质检计量中心,宁夏 银川 750411
- 折叠
摘要
Abstract
Catalysts with different amounts of carbon deposition were prepared from ZMS-5 zeolite.The spin-lattice relaxation time(T1),spin-spin relaxation time(T2),self-diffusion coefficient and tortuosity factor(ξ)were obtained by NMR test.The pore size distribution of the carbon deposition catalyst was analyzed.The diffusion behavior of different solvent molecules in carbon deposition catalyst,the relaxation behavior of carbon deposition catalyst,and the influence of carbon deposition on the mass transfer performance of solvent molecules were explored.The characterization results show that ZSM-5 zeolite has a non-steady state stage with a fast carbon deposition rate and a steady state stage with a slow carbon deposition rate.When heptane and methanol are used as solvent probe molecules,with the increase in carbon deposition,T1 increases,T2 is small,and ξ is basically the same.When cyclohexane serves as a probe molecule,with the increase in carbon deposition,T1 decreases,and T2 is large.With the increases of molecular size of solvent,ξ increases.When heptane,methanol,and cyclohexane are used as probe molecules,the self-diffusion coefficients of probe molecules in various coked catalysts demonstrated negligible variation.关键词
甲醇制丙烯/催化剂/ZSM-5分子筛/溶剂分子Key words
methanol to propylene/catalyst/ZSM-5 zeolite/solvent molecule分类
化学工程引用本文复制引用
吕正忠,常素萍,凌嘉俊,王礼云,卜令坤..溶剂分子在失活ZSM-5催化剂中的扩散行为[J].石油化工,2025,54(3):304-310,7.
