A novel chromic oxide catalyst for NO oxidation at ambient temperature
A novel chromic oxide catalyst for NO oxidation at ambient temperature
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DOI：
10.1039/c4ra02681k
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发表时间：
2014-07
期刊：
影响因子：
3.9
通讯作者：
Shuang Liu;Zhang Min-tao;Yanqiang Huang;Zhao Kunfeng;Gao Zhenyuan;Wu Meijian;Dong Yamei;W. Ting;Jianlin Shi;D. He
中科院分区：
文献类型：
--
作者：
Shuang Liu;Zhang Min-tao;Yanqiang Huang;Zhao Kunfeng;Gao Zhenyuan;Wu Meijian;Dong Yamei;W. Ting;Jianlin Shi;D. He
采用氨沉淀法制备了氧化铬催化剂，并首次用于常温下NO氧化制NO2。在300 °C下煅烧后，催化剂表现出更高的催化活性，NO转化率为100%，并且比迄今为止报道的活性炭或活性炭纤维显著更长的寿命。采用XRD、HRTEM、TG、XPS、拉曼和DRIFT等技术研究了催化剂晶相和表面羟基对NO氧化活性和耐久性的影响。结果表明，催化剂的非晶态结构和表面羟基共同作用，使其具有较高的催化活性和长期稳定性。非晶态氧化铬催化剂的碱处理证实了表面羟基对长时间稳定性的促进作用。
Chromic oxide catalysts were prepared by ammonia precipitation method and first used in NO oxidation to NO2 at ambient temperature. After calcination at 300 °C, the catalyst exhibited higher catalytic activity with 100% conversion of NO and significantly longer lifetime than activated carbon or activated carbon fiber that has been reported so far. The effects of crystalline phases and surface hydroxyl groups on the activity as well as the durability of catalysts in NO oxidation were investigated by XRD, HRTEM, TG, XPS, Raman and DRIFT techniques. The results indicated that the amorphous structure and surface hydroxyl groups together contributed to the high catalytic activity and long-time stability of the catalysts. The promoting effect of surface hydroxyl groups for long-time stability was confirmed by the alkaline treatments of amorphous chromic oxide catalysts.