Highly Active CuO/KCC−1 Catalysts for Low-Temperature CO Oxidation
Highly Active CuO/KCC−1 Catalysts for Low-Temperature CO Oxidation
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DOI：
10.3390/pr10010145
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发表时间：
2022-01
期刊：
影响因子：
3.5
通讯作者：
Yiwei Luo;Yonglong Li;Conghui Wang;Jing Wang;Wenming Liu;Honggen Peng;Daishe Wu
中科院分区：
文献类型：
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作者：
Yiwei Luo;Yonglong Li;Conghui Wang;Jing Wang;Wenming Liu;Honggen Peng;Daishe Wu
铜系催化剂在低温下CO氧化反应中得到了广泛的研究。另一方面，以前关于这种催化剂稳定性的研究结果表明，它们在极端情况下会严重失活。因此，本工作采用浸渍法成功制备了一系列KCC−1负载氧化铜催化剂，其中5%CuO/KCC−1表现出最佳活性：CO在120 °C下可完全转化。5%CuO/KCC−1催化剂表现出更好的热稳定性，这主要归因于KCC−1的大比表面积有利于CuO物种的高度分散，并且因为树枝状层状壁可以延长颗粒之间的运动距离，从而有助于减缓活性组分烧结的趋势。此外，5%CuO/KCC−1具有丰富的介孔和表面活性氧物种，有利于传质，促进CO的吸附和Cu+-CO物种的分解，从而提高催化剂的CO氧化性能。
Copper catalysts have been extensively studied for CO oxidation at low temperatures. Previous findings on the stability of such catalysts, on the other hand, revealed that they deactivated badly under extreme circumstances. Therefore, in this work, a series of KCC−1-supported copper oxide catalysts were successfully prepared by impregnation method, of which 5% CuO/KCC−1 exhibited the best activity: CO could be completely converted at 120 °C. The 5% CuO/KCC−1 catalyst exhibited better thermal stability, which is mainly attributed to the large specific surface area of KCC−1 that facilitates the high dispersion of CuO species, and because the dendritic layered walls can lengthen the movement distances from particle-to-particle, thus helping to slow down the tendency of active components to sinter. In addition, the 5% CuO/KCC−1 has abundant mesoporous and surface active oxygen species, which are beneficial to the mass transfer and promote the adsorption of CO and the decomposition of Cu+–CO species, thus improving the CO oxidation performance of the catalyst.