High yield of pentane production by aqueous-phase reforming of xylitol over Ni/HZSM-5 and Ni/MCM22 catalysts

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• 作者：Ting Jiang^a ; ^b ; Qing Zhang^a ; Tie-Jun Wang^a ; Qi Zhang^a ; Long-Long Ma^a ; ^{mall@ms.giec.ac.cn}
• 关键词：Xylitol ; Pentane ; Ni/HZSM-5 ; Ni/MCM22 ; Aqueous-phase reforming
• 刊名：Energy Conversion and Management
• 出版年：2012
• 期刊代码：13_01968904
• 类别：pw
• 出版时间：July, 2012
• 卷：59
• 期：Complete
• 页码：58-65
• 文件大小：796 K

摘要

Ni/HZSM-5 and Ni/MCM22 catalysts with different Ni loadings were prepared by impregnation method and evaluated for aqueous-phase reforming (APR) reaction of xylitol at 240 掳C and 4 MPa. Effects of Ni loadings on the xylitol conversion and pentane selectivity of the catalyst was investigated. The results showed that the catalytic activities of the two Ni/HZSM-5 and Ni/MCM22 catalysts both increased with increasing Ni loading in the range of 0-2%, and then decreased as Ni loading further increased to 4%. Maximum pentane yields of 91%and 95%could be obtained over 2%Ni/HZSM-5 and 2%Ni/MCM22, respectively. 2%Ni/HZSM-5 deactivated obviously after five recycle runs, while 2%Ni/MCM22 still kept excellent activity with the pentane yield of 90-95%. The catalysts with different Ni loading were characterized by BET, H₂-TPR and NH₃-TPD techniques and the used selected 2%Ni/MCM22 and 2%Ni/HZSM-5 catalyst were also characterized by XRD, FTIR and TG. The characterization results revealed that 2%Ni/MCM22 and 2%Ni/HZSM-5 have similar amounts of Ni active sites, while the 2%Ni/MCM22 has larger surface area, more mesopore and less strong acid sites than the 2%Ni/HZSM-5. Moreover, partial dealumination and coke formation of the used 2%Ni/HZSM-5 catalyst were found. All these factors resulted in the deactivation of 2%Ni/HZSM-5 after five recycle runs.