Effect of Impregnation Sequences of Catalysts on CO Preferential Oxidation in H2-rich Gases

Yan Jing, Ma Jianxin*#
(Institute of Industrial Catalysis, East China University of Science and Technology, Shanghai 200237)
(# Clean Energy Automotive Engineering Center, Tongji University, Shanghai 200092)

Abstract Preferential oxidation was used to reduce 1% CO below 50ppm in H2-rich gases in order to minimize the poison of CO on the Pt anode of fuel cell. The effect of impregnation sequences of K and Pt on CO preferential oxidation in H2-rich gases was studied. The results showed that when K was added after Pt impregnation, the activity of catalyst was improved significantly with the 90% CO conversion and 30% O2 selectivity at 120°C. CO/O2-TPD showed that the addition of K after Pt could enhance CO weak adsorption and facilitate O2 dissociative adsorption.
Key words Impregnation, Preferential oxidation, Carbon monoxide, H2-rich gases, Platinum

　

催化剂浸渍顺序对CO在富氢气氛下选择性氧化性能的影响

严菁 马建新*#
(华东理工大学工业催化研究所 上海 200237 # 同济大学 新能源汽车工程中心 上海 200092)

摘要 采用选择性氧化法将燃料电池阳极富氢气体中约1%的CO降至50ppm以下，以减少对Pt电极的毒害。通过改变K2O和Pt在g-Al2O3上的浸渍顺序，考察其对改善CO转化率和O2选择性的影响。结果表明，采取在负载Pt后再添加K的方式时，可显著改善催化剂的低温活性，在120°C时CO转化率达到90%，选择性达到30%左右。CO/O2-TPD的研究结果表明，后添加K可适当增强CO的弱吸附态并促进O2的解离吸附。
关键词 浸渍 选择性氧化 CO 富氢气体 铂

严菁 女，28岁，博士生，现从事燃料电池供氢系统的催化过程研究。 *联系人， E-mail:jxma@fcv-sh.com

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