Pd catalyst supported on activated carbon honeycomb monolith for CO oxidation and the application in air purification of vehicular tunnel

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• 作者：Li Wang ; Yanhui Zhang ; Yang Lou ; Yanglong Guo ; Guanzhong Lu ; Yun Guo ; ^{yunguo@ecust.edu.cn" class="auth_mail}
• 关键词：CO oxidation ; Ambient temperature ; Monolithic activated carbon ; Support pretreatment ; Tunnel air purification
• 刊名：Fuel Processing Technology
• 出版年：June, 2014
• 年：2014
• 卷：122
• 期：Complete
• 页码：23-29
• 全文大小：932 K

文摘

Different pretreatments (wet, oxidation and complex pretreatments) were used to modify activated carbon honeycomb monolith, and the role of surface properties of support in CO oxidation over Pd/ACHM catalysts was also investigated. Pretreatment was an efficient way to introduce oxygen groups, especially by complex pretreatment. Oxygen-containing groups increased 1.7 times as much as that of original ACHM, and 86% conversion was obtained at 30 掳C and 100% relative humidity on supported Pd catalyst prepared from modified ACHM. Oxygen-containing species on the support not only improved Pd dispersion but also affected Pd states. Compared with Pd dispersion, Pd states played a more important role in CO oxidation. The amount of low-valent Pd species (Pd⁰, Pd^+ 1) on catalyst surface was consistent with CO oxidation activity. The presence of NO caused CO oxidation conversion to decrease by 15% which was attributed to the difference between NO and CO adsorption energy on Pd surfaces confirmed by density functional theory calculation. 90 days' 1000 m³/h pilot experiment results showed that the catalyst exhibited high activity and stability in the presence of moisture and NO_x.