Pd/K/Co-oxide catalyst for water gas shift
Pd/K/Co-oxide catalyst for water gas shift
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DOI：
10.1016/j.apcata.2014.10.016
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发表时间：
2015
影响因子：
5.5
通讯作者：
E. Kono;Sakurako Tamura;Keisuke Yamamuro;Shuhei Ogo;Yasushi Sekine
中科院分区：
文献类型：
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作者：
E. Kono;Sakurako Tamura;Keisuke Yamamuro;Shuhei Ogo;Yasushi Sekine
考察了不同Co 3 O 4催化剂在水煤气变换制氢反应中的催化性能。虽然单独负载Pd的催化剂（Pd/Co 3 O 4）表现出较低的催化活性和较高的甲烷化选择性，但当钾负载量超过0.78wt%时，Pd/K/Co 3 O 4催化剂表现出较高的WGS反应活性。Pd和K紧密存在的催化剂表现出高活性，这一点通过各种制备方法得到证实。Pd/K/Co 3 O 4催化剂的XPS测试结果表明，负载的钾为Pd和Co提供了电子，钾负载量影响了CO吸附物种的状态，从而使Pd/K/Co 3 O 4催化剂具有较高的催化活性。这些效应使得Pd/K/Co 3 O 4催化剂对WGS反应具有高的催化活性。该反应在Pd/K/Co 3 O 4上进行，通过表面羰基钴，然后甲酸酯中间体，如所揭示的TG和同位素交换测量使用H218 O和DRIFT。
Various Co3O4catalysts were investigated for the water gas shift (WGS) reaction for hydrogen production. Although the catalyst supporting only palladium (Pd/Co3O4) showed low catalytic activity and higher selectivity to methanation, Pd/K/Co3O4catalyst, with loading of potassium exceeding 0.78 wt%, showed high catalytic activity for the WGS reaction. Catalysts on which Pd and K exist closely showed high activity, as confirmed using various preparation methods. Results of XPS measurements for Pd/K/Co3O4revealed that supported potassium donated electrons to Pd and Co. The state of CO adsorption species was affected by the potassium loading, resulting in high catalytic activity for the Pd/K/Co3O4catalyst. These effects gave the Pd/K/Co3O4catalyst high catalytic activity for the WGS reaction. That reaction over Pd/K/Co3O4proceeds via surface cobalt carbonyl and then formate intermediates, as revealed by the TG and isotope exchange measurements using H218O and DRIFT.