Coking behaviors and kinetics on HZSM-5/SAPO-34 catalysts for conversion of ethanol to propylene

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• 作者：Ting Bai ; Xin Zhang ; ^{zhangxinzhangcn@aliyun.com" class="auth_mail" title="E-mail the corresponding author} ; Feng Wang ; Wenting Qu ; Xiling Liu ; Chao Duan
• 关键词：Ethanol ; HZSM-5/SAPO-34 catalyst ; Acidity ; Coke ; Regeneration
• 刊名：Journal of Energy Chemistry
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：25
• 期：3
• 页码：545-552
• 全文大小：799 K

文摘

The coke deposition on HZSM-5/SAPO-34 composite catalysts has been studied in the conversion of ethanol to propylene. The HZSM-5/SAPO-34 composite catalysts were synthesized by hydrothermal method (ZS-HS) and fully blending (ZS-MM). The used catalysts were characterized by XRD, N₂ adsorption–desorption, TGA, TPO, elemental analysis, FTIR and XPS. The coking kinetics on both ZS-HS and ZS-MM has been investigated and their coking rate equations were obtained. The used ZS-MM catalyst had higher amount of coke and lower n_C:n_H than the used ZS-HS. 90% of the coke was deposited in the micropores of ZS-HS, while almost 45% of the coke located in the micropores of ZS-MM. The coke deposited on ZS-HS catalyst was mainly graphite-like carbon species, whereas dehydrogenated coke species was the major on ZS-MM. The coking activation energy of ZS-MM was lower than that of ZS-HS, and the coking rate on ZS-MM was faster than on ZS-HS. In addition, the regeneration of ZS-MM catalyst showed that it had a good hydrothermal stability. The differences on coking behaviors on the two catalysts were due to their different acidic properties and textures.