碱金属碳酸盐掺杂的Ce-Zr-O对甲烷转化催化性能的影响

摘要

Pure Ce-Zr-O mixed oxide was prepared via precipitation method, and catalysts doped with alkali carbonates (M2CO3, M=Li, Na, K) were prepared by incipient wetness impregnation methods. The catalytic activity for methane was investigated by the gas-solid reaction in a fixed bed reactor, and characterized by means of XRD and H2-TPR techniques. The results show that the catalytic activity of Ce-Zr-O is promoted with varied following the doping of alkali carbonates, the anti-coking and anti-sintering properties of the catalysts are enhanced, and the surface oxygen species and the bulk oxygen species of the catalysts are improved as well.%采用共沉淀法制备了Ce-Zr-O载体,通过等体积浸渍法得到碱金属碳酸盐掺杂的M2CO3/Ce-Zr-O(M=Li,Na,K)催化剂.采用自制的小型固定床反应器考察了催化剂的甲烷转化催化活性,并利用XRD和H2-TPR对催化剂进行了表征.研究结果表明,碱金属碳酸盐的添加均不同程度地提高了Ce-Zr-O催化剂的催化活性、抗积碳性能和抗烧结性能,还改善了催化剂表面氧物种和体相氧物种的氧化还原性能.