【摘 要】
：
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
【机 构】
：
School of Chemical Engineering, Northwest University, Xi’an 710069, Shaanxi, China
论文部分内容阅读
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 nc:nH 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.
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