The Study on the Active Site Regulated RuOx/Sn0.2Ti0.8O2 Catalysts with Different Ru Precursors for the Catalytic Oxidation of Dichloromethane
The Study on the Active Site Regulated RuOx/Sn0.2Ti0.8O2 Catalysts with Different Ru Precursors for the Catalytic Oxidation of Dichloromethane
复制标题
不同Ru前驱体的活性中心调节型RuOx/Sn0.2Ti0.8O2催化剂催化氧化二氯甲烷的研究
DOI：
10.3390/catal11111306
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发表时间：
2021-10
期刊：
影响因子：
3.9
通讯作者：
Yang Yang-Yang;Zhong Zheng;Mengyue Kong;Zhesheng Hua;Zhengda Yang;Ye Jiang;Shaojun Liu;Xinhuan Yan;Xiang Gao
中科院分区：
文献类型：
--
作者：
Yang Yang-Yang;Zhong Zheng;Mengyue Kong;Zhesheng Hua;Zhengda Yang;Ye Jiang;Shaojun Liu;Xinhuan Yan;Xiang Gao
工业废气中存在的含氯挥发性有机化合物(CVOCs)会对人体和环境造成极大的危害。为了进一步研究CVOCs的催化氧化，开发了不同Ru前驱体的活性中心可调节RuOx/Sn0.2Ti0.8O2催化剂。以二氯甲烷为模型分子，活性测试结果表明，用Ru胶体优化Ru前驱体可显著提高催化剂的活性(当Ru负载量为1wt%时，T90降低约90℃)。对表征结果的分析表明，催化剂性能的提高主要是由于活性物种分散性的改善(Ru团簇的尺寸从3~4 nm减小到1.3 nm左右)以及活性物种与载体之间相互作用的增强。提高了活性组分的利用率，TOF值提高了近一倍，催化剂的整体氧化性能也得到了提高。研究了催化剂的Ru负载量与催化活性的关系，以更好地确定催化剂的最佳Ru负载量。结果表明，随着Ru负载量的增加，RuOx物种在催化剂表面的分散性逐渐降低，但其总量有所增加。这两种效应的共同作用，使催化剂的催化活性先是变化不大，然后显著提高。因此，本课题的研究对于有效处理氯代烃，进一步降低催化剂中活性组份的含量具有重要意义。
Chlorine-containing volatile organic compounds (CVOCs) present in industrial exhaust gas can cause great harm to the human body and the environment. In order to further study the catalytic oxidation of CVOCs, an active site regulated RuOx/Sn0.2Ti0.8O2 catalyst with different Ru precursors was developed. With Dichloromethane as the model molecule, the activity test results showed that the optimization of Ru precursor using Ru colloid significantly increased the activity of the catalyst (T90 was reduced by about 90 °C when the Ru loading was 1 wt%). The analysis of characterization results showed that the improvement of the catalytic performance was mainly due to the improvement of the active species dispersion (the size of Ru cluster was reduced from 3–4 nm to about 1.3 nm) and the enhancement of the interaction between the active species and the support. The utilization efficiency of the active components was improved by nearly doubling TOF value, and the overall oxidation performance of the catalyst was also enhanced. The relationship between the Ru loading and the catalytic activity of the catalyst was also studied to better determine the optimal Ru loading. It could be found that with the increase in Ru loading, the dispersibility of RuOx species on the catalyst surface gradually decreased, despite the increase in their total amount. The combined influence of these two effects led to little change in the catalytic activity of the catalyst at first, and then a significant increase. Therefore, this research is meaningful for the efficient treatment of CVOCs and further reducing the content of active components in the catalysts.