Abstract
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.
Highlights
Chlorine-containing volatile organic compounds (CVOCs) are widely present in waste gas emitted by industries such as dry cleaning, medicine, organic synthesis, and metal processing [1,2,3,4]
This indicated that using Ru colloid instead of the original RuO2 as precursor to load active components could improve the catalytic activity of the catalyst to a large extent
By further comparing the catalytic activity of the c-1-RuST and the o-5-RuST sample, it could be seen that the catalytic activity of the c-1-RuST was significantly higher than that of the o-5-RuST (T90 was about 290 ◦C and 340 ◦C, respectively)
Summary
Chlorine-containing volatile organic compounds (CVOCs) are widely present in waste gas emitted by industries such as dry cleaning, medicine, organic synthesis, and metal processing [1,2,3,4]. The acidic sites on the surface of the catalyst can effectively adsorb and activate the C-Cl bonds of the CVOC molecules, thereby improving the low-temperature catalytic activity of the catalyst [10,18,19]. We optimized the Ru precursor and used Sn0.2Ti0.8O2 as support to prepare efficient and stable CVOCs catalysts. Catalysts 2021, 11, 1306 improvement in the catalytic performance by the optimization of Ru precursor, we prepared the o-5-RuST sample with a Ru loading of 5 wt% for catalytic activity comparison. The Ru colloid solution was taken with different content and fully mixed with the support powder, evaporated, dried, ground, and calcined at 500 ◦C for 5 h to obtain the three samples with different Ru contents.
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