Institute of Nanoscience and Nanotechnology, University of Kashan, P.O. Box 8731751117, Kashan, Iran.
School of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology (IUST), P.O. Box 16765-163, Tehran, Iran.
Environ Sci Pollut Res Int. 2021 Jan;28(1):379-388. doi: 10.1007/s11356-020-10484-x. Epub 2020 Aug 18.
The Mn/Co mixed powders with various Mn/Co molar ratios were prepared by the coprecipitation method and used in low-temperature CO oxidation. The physicochemical characteristics of these powders were characterized using the Brunauer-Emmett-Teller (BET), X-ray diffraction (XRD), temperature-programmed reduction (TPR), and scanning electron microscopy (SEM) analyses. The results demonstrated that the Mn/Co molar ratio significantly affected both the textural and catalytic properties and the sample with a Mn/Co = 1:1 possessed a BET area of 123.7 mg with a small mean pore size of 6.44 nm. The catalytic results revealed that the pure cobalt and manganese catalysts possessed the low catalytic activity and the pure Co catalyst is not active at temperatures lower than 140 °C. The highest catalytic activity was observed for the catalyst with a Mn/Co = 1. The obtained results showed that the incorporation of Pd into the Mn/Co catalyst significantly enhanced the catalytic activity for oxidation of carbon monoxide and the highest CO conversion was observed for the catalyst with 1 wt.% Pd and this catalyst exhibited a CO conversion of 100% at 80 C.
采用共沉淀法制备了不同 Mn/Co 摩尔比的 Mn/Co 混合粉末，并将其用于低温 CO 氧化反应中。采用 BET、XRD、TPR 和 SEM 分析对这些粉末的物理化学特性进行了表征。结果表明，Mn/Co 摩尔比对其结构和催化性能均有显著影响，Mn/Co=1:1 的样品具有 123.7mg 的 BET 比表面积和 6.44nm 的小平均孔径。催化结果表明，纯钴和锰催化剂的催化活性较低，而纯 Co 催化剂在低于 140°C 的温度下不具有活性。Mn/Co=1 的催化剂具有最高的催化活性。结果表明，将 Pd 掺入 Mn/Co 催化剂中可显著提高 CO 氧化的催化活性，在添加 1wt.%Pd 的催化剂中观察到最高的 CO 转化率，该催化剂在 80°C 时的 CO 转化率达到 100%。
