Effect of Si/Al ratio of high-silica HZSM-5 catalysts on the prins condensation of isobutylene and formaldehyde to isoprene

被引：18

作者：

Yu, Xue ^{[1
]}

Li, Bing ^{[2
]}

Zhang, Yuewei ^{[1
]}

机构：

[1] Jilin Inst Chem Technol, Jilin 132022, Jilin, Peoples R China

[2] Jilin Univ, Coll Chem, Natl Key Lab Inorgan Synth & Preparat Chem, Changchun 130012, Jilin, Peoples R China

来源：

HELIYON | 2019年 / 5卷 / 05期

关键词：

Organic chemistry; Materials chemistry; ZSM-5; ZEOLITES; METHANOL; VAPOR; PERFORMANCE; CONVERSION; AROMATICS; ISOBUTENE; CRACKING; ETHANOL;

D O I：

10.1016/j.heliyon.2019.e01640

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

A series of HZSM-5 catalysts with different Si/Al ratio were prepared and characterized with various characteristic methods XRD, BET, NH3-TPD, FT-IR spectra of adsorbed pyridine, etc. The effect of Si/Al ratio of HZSM-5 catalysts on the prins condensation of isobutylene and formaldehyde to isoprene was investigated in detail. It is resulted that the catalytic activities are dependent on the acid strength, decreasing with the ratio of Si/Al increases. The optimized catalyst was HZSM-5 (600) with 8.8% of isobutene conversion and 90.2% of selectivity to isoprene, indicating that the higher Si/Al ratio was termed as appropriate for prins condensation of isobutylene and formaldehyde to isoprene. On the contrary, the low Si/Al ratio may lead to the formation of by-products and coke deposits, which leads the catalysts deactivation.

引用

页数：5

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