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首页> 外文期刊>Catalysis science & technology >In situ sulfation of Cu/TiO2 catalysts for catalytic combustion of dichloromethane
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In situ sulfation of Cu/TiO2 catalysts for catalytic combustion of dichloromethane

机译：原位铜/二氧化钛催化剂硫酸盐化作用二氯甲烷的催化燃烧

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摘要

Herein, a facile in situ sulfation strategy was employed for modifying Cu/TiO2 catalysts using CuSO4 as the precursor to enhance the performance of dichloromethane (DCM) catalytic combustion. The experimental results revealed that the modified samples exhibited superior DCM conversion and COx yield compared to the pristine Cu/TiO2 catalyst. Among these, the 1CuSO(4)/TiO2 sample showed the best activity with near 90% conversion during 50 h of reaction at 275 degrees C. Characterization results showed that the in situ sulfation modification could considerably improve the catalyst acidity, benefiting the dissociative adsorption of DCM with C-Cl rupture. Notably, the surface sulfate groups provided abundant Bronsted acidic sites that release surface Cl species in the form of HCl at relatively low temperatures, preventing the surface Cu species from chloride poisoning. With excess CuSO4 addition, the intermediates derived from DCM dechlorination could not be decomposed in time due to the decreased reducibility, leading to their deactivation due to coke deposition. The superior performance of 1CuSO(4)/TiO2 is attributed to the balance achieved between acidity and redox capacity for DCM catalytic decomposition. Moreover, it was found that CuSO4/TiO2 could partially replace noble-metal Ru/TiO2 catalysts and achieve comparable performances. The findings of this study will aid the development of CVOCs catalytic combustion catalysts with good activity and stability.
机译：在此,简单原位硫酸盐化作用的策略用于修改铜/二氧化钛催化剂使用CuSO4作为前体来提高性能二氯甲烷(DCM)的催化燃烧。实验结果表明修改后的样品表现出优越的扩张型心肌病转换和考克斯收益率相对于原始铜/二氧化钛催化剂。示例显示近90%的最好的活动在275度反应的转换在50 h表征结果表明,在原地硫酸盐化作用改造可以很大提高催化剂的酸度,受益解离吸附的DCM C-Cl破裂。值得注意的是,表面硫酸组提供丰富的布仑斯惕酸性网站发布表面Cl物种在盐酸的形式相对较低的温度,防止表面铜物种从氯中毒。过剩CuSO4之外,中间体从DCM脱氯不能分解由于还原能力下降,由于可口可乐导致其失活沉积。1 cuso(4) /二氧化钛是归因于平衡实现了酸性和氧化还原能力之间的关系DCM催化分解。发现CuSO4 /二氧化钛可以部分取代贵金属俄文/二氧化钛催化剂,实现类似的表演。研究将援助CVOCs催化的发展燃烧催化剂具有良好的活性和稳定。

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