摘要
运用程序升温脱附/还原(TPD/R)技术,研究了不同材质制备的活性炭表面性质,并与其负载的钌基氨合成催化剂活性进行关联。同时,采用H2-TPD和N2-TPD手段考察了一系列钌基催化剂; 研究了助剂对H2、N2吸附的影响。研究结果表明:活性炭表面性质随材质的不同有较大的差异,导致其负载钌基催化剂活性的不同。而助剂的加入也极大地影响了H2和N2的脱附性能, 特别是助剂K使催化剂的低温H2吸附量显著提高,脱附温度从288℃降低到166℃,使N2的脱附量也明显增加,且脱附温度从420℃降到385℃。
The surface characteristics of different active carbons and their effects on the catalytic activities of Ru calalysts for NH3 synthesis were studied by temperature programmed reduction of H2 (H2—TPR) experiments. The results showed that the effect of the surface characteristic of active carbon on the activities of catalyst is significant. The promotion of Ba and K were characterized by temperature programmed desorption (TPD). The results showed that the addition of promoter has remarkable influence on the adsorption of H2 and N2. Especially, the K improves remarkably the adsorption of H2 and N2, and that it makes the desorption temperature of H2 and N2 low from 288C to 166C and420C to 385C, respectively.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2002年第5期565-569,共5页
Journal of Chemical Engineering of Chinese Universities
基金
中国石油化工总公司资助项目(499051)。
关键词
活性炭
表面性质
钌
氨合成催化剂
程序升温脱附/还原
active carbon
surface characteristic
ruthenium
ammonia synthesis catalysts
temperature programmed desorption/reduction (TPD/R).
