燃料化学学报2021，Vol.49Issue(10)：1468-1486,19.DOI:10.1016/S1872-5813(21)60130-5
HZSM-5纳米颗粒中Ca含量对甲醇制烯烃反应及积炭生成的影响
Effects of Ca content on the activity of HZSM-5 nanoparticles in the conversion of methanol to olefins and coke formation
摘要
Abstract
Effects of calcium content on the performance of HZSM-5 nanoparticles of 150 nm with Si/Al ratio = 230 in the methanol to olefin conversion were investigated. The parent and modified catalysts showed their largest yields of ethylene and propylene at 490 ℃ and lower WHSV (= 3.3 h?1). The selectivity for propylene over HZSM-5 was 0.45 at 490 ℃ whereas it was promoted to 0.51 over Ca27-HZSM-5 (Ca/Al = 27). With decreasing temperature from 490 to 440, and 390 ℃, the yield of propylene and ethylene remained nearly constant at 0.13?0.14 and 0.10?0.11 over Ca27-HZSM-5, respectively; more narrow than the corresponding range of yields for HZSM-5 (0.10?0.14 and 0.08?0.12). FT-IR results confirmed the formation of oxygenated and poly alkyl aromatic species in the carbon deposits. TG results indicated that oxygenate coke was formed and converted to heavier poly aromatic coke species with time. Increasing Ca in the porous structure of HZSM-5 may lead to heavier aromatic carbonaceous deposits. In general, Ca content positively affected activity through modification of the density, strength, and accessibility of Br?nsted and Lewis acid sites. Long-term MTO activity test of HZSM-5 with Ca/Al =27 showed stable performance over 100 h, although with an oscillatory feature.关键词
ZSM-5/分子筛/甲醇制烯烃/催化剂/反应/纳米技术Key words
ZSM-5/zeolite/MTO/catalyst/reaction/nano分类
化学化工引用本文复制引用
GHAEDI Mohammad,IZADBAKHSH Ali..HZSM-5纳米颗粒中Ca含量对甲醇制烯烃反应及积炭生成的影响[J].燃料化学学报,2021,49(10):1468-1486,19.基金项目
Financial support of South Pars Gas Complex(S.P.G.C),Vice-Presidency of Research and Technology is gratefully acknowledged. （S.P.G.C）
