Abstract
In this work, modified Ru/Ti catalysts with support sulfation by the introduction of solid superacid Ti(SO4)2 were employed for the catalytic combustion of dichloromethane (DCM). The experimental results showed that the optimal Ru/TiS0.05 sample yielded a near 100% DCM conversion at 275 °C, which was almost 30% higher than that of the pristine Ru/Ti catalyst. After a series of sample characterizations, it was found that there existed strong interactions between Ru species and sulfated TiO2 support, which would improve the dispersion of Ru species, thereby generating more active sites for DCM deep oxidation. Furthermore, the enhanced acidity derived from sulfation modification would facilitate DCM dissociation, and the generation of Brønsted acidic sites improved HCl selectivity. As such, both the enhancements in acidity and Ru dispersion after sulfation modification resulted in its superior performance of DCM catalytic abatement. Moreover, excessive Ti(SO4)2 addition would lead to the blockage of the pore structure and significantly decrease in the reducibility of the catalyst, leading to the loss of the activity.
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