Jain Ruchi, Gnanakumar Edwin S, Gopinath Chinnakonda S
Catalysis Division, National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411 008, India.
Centre of Excellence on Surface Science, National Chemical Laboratory, Pune 411 008, India.
ACS Omega. 2017 Mar 7;2(3):828-834. doi: 10.1021/acsomega.6b00471. eCollection 2017 Mar 31.
Catalytic activity, electronic structure, and the mechanistic aspects of CoO nanorod (NR) surfaces have been explored for CO oxidation in dry and wet atmosphere using near-ambient pressure ultraviolet photoelectron spectroscopy. Presence of water with CO + O plummets the catalytic activity because of the change in the electronic nature from predominantly oxide (without water in feed) to a CoO surface covered by a few intermediates. However, at ≥375 K, the CoO surface recovers and regains the oxidation activity, at least partially, even in the presence of water. This is fully supported by the changes observed in the work function of CoO under wet (HO + CO + O) conditions compared with dry (CO + O) conditions. This study focuses on the comparative CO oxidation rate on CoO NR surfaces and highlights the changes in the electronic structure that occur in the catalyst during the CO oxidation reaction.
利用近常压紫外光电子能谱，研究了CoO纳米棒（NR）表面在干燥和潮湿气氛中对CO氧化的催化活性、电子结构及反应机理。由于进料中无水时主要为氧化物，而有水时CoO表面被一些中间体覆盖，电子性质发生变化，所以CO + O体系中存在水会使催化活性骤降。然而，在≥375 K时，即使存在水，CoO表面也能恢复并至少部分恢复氧化活性。与干燥（CO + O）条件相比，在潮湿（H₂O + CO + O）条件下CoO功函数的变化充分证实了这一点。本研究重点关注CoO NR表面上CO的氧化速率比较，并突出了CO氧化反应过程中催化剂电子结构的变化。
