Preparation of shaped magnesium oxide/carbon catalysts using rice grains as an exotemplate and carbon precursor

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• 作者：Li Ma ; Xiaoyue Zhang ; Dan Lin ; Yuan Chun ; ^{ychun@nju.edu.cn} ; Qinhua Xu
• 关键词：Magnesium oxide ; Rice grains ; In situ transformation ; Exotemplate ; Black carbon
• 刊名：Applied Catalysis A: General
• 出版年：2013
• 出版时间：10 June, 2013
• 年：2013
• 卷：460-461
• 期：Complete
• 页码：26-35
• 全文大小：3423 K

文摘

Biomorphic magnesium oxide and magnesium oxide/carbon catalysts have been synthesized via an in situ transformation technique using rice grains as a template and carbon precursor. During preparation, MgO precursors are dispersed on the surface of rice grains with the aid of the rice-cooking process, and further transformed into solid bases upon calcination. Biomorphic MgO/carbon materials are formed when calcination is performed in a nitrogen atmosphere. These particles are spindle shaped catalysts with a circumference of several millimeters. Pyrolysis at higher temperature aids in the formation of porous structures, and the resulting MgO/carbon materials display high specific surface area (>260 m²/g) and more strongly basic sites. The presence of black carbon affects the catalytic behavior of MgO in the methylation of cyclopentadiene. These shaped MgO/carbon materials exhibit much higher catalytic performance than MgO at lower reaction temperatures.