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铂基催化剂快速部分催化氧化甲烷的研究 认领

Study on Rapid and Partial Oxidation of Methane by Platinum Promoted Catalyst
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摘要 以Al 2O 3为载体,采用浸渍法制备Pt/Al 2O 3催化剂,通过测量重整反应过程中催化剂的温度分布情况,研究了改变甲烷快速部分氧化重整反应中反应条件(反应气体预混合温度、N 2体积比例、CH 4/O 2比)对反应物的转化率及产物选择性的影响。研究发现,催化剂床层温度的上升可以促进CH 4的转化,使H 2和CO的选择性升高且H 2与CO的物质的量的比(简称H 2/CO比,依此类推)升高。N 2体积比例及CH 4/O 2比的升高,会降低催化剂床层温度,进一步造成CH 4的转化率和H 2/CO比降低,但与仅降低混合气预热温度不同的是,提高N 2体积比例及CH 4/O 2比会造成H 2和CO的选择性升高,这可能是催化剂表面的活性氧导致的。通过对甲烷在Pt催化剂上的反应机理进行了初步讨论,认为甲烷的快速部分催化氧化反应为多种反应路径共存,不同的反应条件下各种反应路径所占比例会发生变化。 A Pt/Al 2O 3 catalyst was prepared from the impregnation ofα-Al 2O 3 foam,and an experimental system for methane reforming was established.By adjusting the reaction parameters,the effects of different reaction parameters(including CH 4/O 2 ratio,feed gas temperature,N 2 volume percent)on the conversion rate of reactants and the selectivity of product were researched.The results show that the increase of catalyst bed temperature can promote the conversion of CH 4,the selectivity of H 2 and CO,and the ratio of H 2/CO.The increase of the N 2 volume percent and CH 4/O 2 ratio will cause a decrease in the temperature of the catalyst bed,which further leads to a reduction in the conversion rate of CH 4 and H 2/CO ratio,but it would also increase the selectivity of H 2 and CO,which may be due to the active oxygen on the surface of the catalyst.By measuring the temperature distribution of the catalyst and analyzing the reaction mechanism of methane by the platinum promoted catalyst,it is found that the rapid and partial catalytic oxidation of methane had multiple reaction paths,and the proportion of very reaction path will change under different reaction conditions.
作者 郑建 包叶朋 周锐 张毅然 林赫 ZHENG Jian;BAO Yepeng;ZHOU Rui;ZHANG Yiran;LIN He(Key Laboratory of Power Machinery and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)
出处 《内燃机工程》 EI CAS CSCD 北大核心 2021年第1期28-33,共6页 Chinese Internal Combustion Engine Engineering
关键词 甲烷 快速重整 部分氧化 氢气 methane quick reforming partial oxidation H 2 Pt
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