论文部分内容阅读
采用甘氨酸燃烧法制备了不同负载量的Co/CeO_2催化剂,考察了钴负载量和反应温度对其在富氢气氛中选择性催化氧化CO的反应性能,并与浸渍法制备的Co/CeO_2催化剂进行了对比;同时采用XRD、SEM和H_2-TPR等手段对催化剂进行了表征.结果表明,在富氢气氛下,甘氨酸燃烧法制备的Co/CeO_2催化剂,对CO的选择性催化氧化反应,具有较好的低温反应活性和较高的选择性.当钴金属氧化物负载量为30%时,在150~200℃,催化剂对CO的催化氧化率达到99%以上;并且在反应温度为150℃时,催化剂对CO催化氧化的选择性达到100%.另外,通过用XRD、Raman和TPR对催化剂进行分析表征,在甘氨酸燃烧法制备的催化剂中Co_3O_4具有较好的分散度,Co和Ce之间的相互协同作用提高了催化剂的催化氧化活性和选择性.
The Co / CeO_2 catalysts with different loadings were prepared by the combustion method of glycine. The catalytic activity of cobalt loading and reaction temperature on the selective catalytic oxidation of CO in the hydrogen-rich atmosphere were investigated. The results were compared with that of the Co / CeO_2 catalyst prepared by the impregnation method The catalysts were characterized by means of XRD, SEM and H_2-TPR.The results showed that the selective catalytic oxidation of CO by the glycine combustion method in the hydrogen-rich atmosphere has the advantages over the CO Good low temperature reactivity and high selectivity.When the cobalt metal oxide loading is 30%, the catalytic oxidation rate of CO over 99% at 150 ~ 200 ℃, and when the reaction temperature is 150 ℃ , The selectivity of the catalyst to CO catalytic oxidation was 100%. In addition, the catalyst prepared by the method of combustion of glycine showed better dispersivity and higher catalytic activity than Co and Ce by means of XRD, Raman and TPR analysis The synergistic effect enhances the catalyst’s catalytic oxidation activity and selectivity.