Oxidation of Carbon Monoxide over Nanoparticles of Cobalt Oxides

Yeong-Jey Chen; Dai-en Wu; Chuin-tih Yeh

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Oxidation of Carbon Monoxide over Nanoparticles of Cobalt Oxides

机译：一氧化碳在氧化钴纳米颗粒上的氧化

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Nanoparticles of CoO_x and Au/CoO_x (x is an atomic ratio between 1.00 and 1.33) were prepared to study their catalytic activity towards the CO oxidation. The oxidation state of cobalt ions in the prepared samples was characterized with TPR (the temperature programmed reduction) technique. Their catalytic activities towards the CO oxidation were further tested in a fixed bed flow reactor. The measured activity generally increased with ratio x in CoO_x and Au/CoO_x. Observed variation in activity was interpreted with a mechanism of competitive CO oxidation by two kinds of oxygen species, i.e., the oxygen molecularly adsorbed on CoO_x surface and the oxygen ions on the surface of Co₃O₄ spinel structure. A deposition of Au crystallites onto the surface of CoO_x not only promoted the catalytic activity but also altered the kinetic order of CO.

机译：制备了CoO _{x 和Au / CoO _{x （x原子比在1.00和1.33之间）的纳米颗粒，以研究其对CO氧化的催化活性。用TPR（程序升温还原）技术表征了制备样品中钴离子的氧化态。在固定床流动反应器中进一步测试了它们对CO氧化的催化活性。在CoO _{x 和Au / CoO _{x 中，活性通常随x的增加而增加。观察到的活性变化是通过两种氧分子竞争性CO氧化的机理来解释的，即分子吸附在CoO _{x 表面的氧和Co _{3表面的氧离子 O _{4 尖晶石结构。 Au微晶在CoO _{x 表面的沉积不仅促进了催化活性，而且改变了CO的动力学顺序。}}}}}}}}

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《Reviews on Advanced Materials Science》 |2003年第1期|共页
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Yeong-Jey Chen; Dai-en Wu; Chuin-tih Yeh;
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Oxidation of Carbon Monoxide over Nanoparticles of Cobalt Oxides

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