Deactivation of HZSM-5 catalyst in methanol to gasoline

doi:10.11949/j.issn.0438-1157.20150891

Abstract

Abstract:

The catalytic performances and the main deactivation mode of HZSM-5 zeolite were investigated by methanol to gasoline (MTG) reaction in a stainless-steel fixed bed reactor. The catalyst was characterized by means of techniques such as TGA-DTA, XRD, FT-IR, N₂ adsorption-desorption and GC-MS. The results showed that the methanol conversion was 40% and the gasoline yield could drop to 12.6% after 336 h for the reaction, resulting in the serious deactivation of HZSM-5 catalyst. However, the regenerated catalyst at 700℃ in the air had high activity and the MFI framework structure. It was found that the coke, which deposited mainly on micropores of HZSM-5, was the main reason for catalyst deactivation. The main components of coke deposits were polymer with double bond or/and polycyclic aromatic hydrocarbon.

Key words: HZSM-5 zeolite, methanol to gasoline(MTG), catalysis, deactivation, coking

摘要：

在固定床不锈钢反应器中进行了HZSM-5分子筛催化甲醇制汽油(MTG)反应的催化性能和失活实验。采用热重、X射线衍射、FT-IR、低温氮吸附-脱附、色谱-质谱联用仪等方法对催化剂进行了表征。结果表明,在反应进行到336 h时,甲醇转化率为40%,汽油收率低至12.6%,催化剂严重失活,但在700℃有氧再生后活性恢复,且保持了完整的MFI结构。积炭是催化剂失活的主要原因,大部分积炭沉积在分子筛微孔中,积炭物种主要是带有双键的聚合态化合物和稠环芳烃。

关键词: HZSM-5沸石, MTG反应, 催化, 失活, 焦化

CLC Number:

TQ221.21

ZHANG Xiangjing, MA Renjuan, SUN Ruiyu, LIU Yumin. Deactivation of HZSM-5 catalyst in methanol to gasoline[J]. CIESC Journal, 2015, 66(9): 3483-3489.

张向京, 马仁娟, 孙瑞钰, 刘玉敏. HZSM-5催化剂在MTG反应中的积炭失活[J]. 化工学报, 2015, 66(9): 3483-3489.

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