燃料化学学报2020，Vol.48Issue(3)：311-320,10.
ZSM-5分子筛酸性质对甲醛合成三聚甲醛催化性能的影响
Effect of acidity on the catalytic performance of ZSM-5 zeolites in the synthesis of trioxane from formaldehyde
摘要
Abstract
ZSM-5 zeolite is considered as an effective catalyst in the synthesis of trioxane from formaldehyde. In this work, a series of ZSM-5 zeolites with different SiO2/Al2 O3 molar ratios were used in the synthesis of trioxane from formaldehyde; through characterization by XRF, XRD, SEM, NH3-TPD, Py-FTIR and 27 Al MAS NMR, the effect of acidity including the Br?nsted and Lewis acid sites on the catalytic performance of ZSM-5 zeolites in the trioxane synthesis was investigated. The results indicate that the ZSM-5-250 zeolite with a SiO2/Al2 O3 molar ratio of 250 exhibits excellent catalytic performance in the synthesis of trioxane. The ZSM-5-250 zeolite owns sufficient amount of Br?nsted acid sites which are active for the synthesis of formaldehyde to trioxane;meanwhile, it has few Lewis acid sites and can then effectively inhibit various side-reactions like the Cannizzaro or Tishchenko reactions. Moreover, the ZSM-5-250 zeolite displays high stability with a single-pass lifetime of 114 h and can be regenerated easily through calcination at 550℃.关键词
三聚甲醛/ZSM-5分子筛/甲醛/酸性/Br∅nsted酸/Lewis酸Key words
trioxane/ZSM-5 zeolite/formaldehyde/acidity/Br∅nsted acid/Lewis acid分类
化学化工引用本文复制引用
叶宇玲,付梦倩,陈洪林,张小明..ZSM-5分子筛酸性质对甲醛合成三聚甲醛催化性能的影响[J].燃料化学学报,2020,48(3):311-320,10.基金项目
The project was supported by the National Key R&D Program of China (2018YFB0604902). （2018YFB0604902）
