Mesocellular-foam-silica-supported Ni catalyst: Effect of pore size on H₂ production from cellulose pyrolysis

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• 作者：Rosalia N. Widyaningrum ; ^{rwid5907@uni.sydney.edu.au} ; Tamara L. Church ; Ming Zhao ; Andrew T. Harris ; ^{andrew.harris@sydney.edu.au} ; ^{tamara.church@sydney.edu.au}
• 关键词：Mesocellular foam ; Nickel ; Cellulose pyrolysis ; H2 production ; Tar cracking
• 刊名：International Journal of Hydrogen Energy
• 出版年：2012
• 出版时间：June, 2012
• 年：2012
• 卷：37
• 期：12
• 页码：9590-9601
• 全文大小：1350 K

文摘

Supported nickel metal can be used as a tar-cracking catalyst in the thermal processing of large organics to give H₂. Though porous supports offer the opportunity to disperse a relatively large amount of nickel, catalytic sites within small pores may be inaccessible to large tar molecules. To investigate this, we prepared nickel catalysts supported on ¦Ã-Al₂O₃ and on SBA-15- and mesocellular-foam-(MCF)-type silicas and studied their catalytic activities in the pyrolytic decomposition of cellulose (RT?¡ú?00?¡ãC, ?T/?em>t?=?40?¡ãC/min). A thermogravimetric analyser-mass spectrometer (TG-MS) was used to study the influence of the Ni catalyst and support materials on the H₂ yield and selectivity. The silica-MCF-supported Ni catalyst decreased char residue and enhanced H₂ yield, producing 1.6 and 3.5¡Á?the H₂ yield obtained using SBA-15-supported Ni and ¦Ã-Al₂O₃-supported Ni, respectively. MCF, with ultra-large pores (d?¡«?5?0?nm), was thus identified as the most beneficial catalyst support for this application.