摘要
考察了贵金属钯的加入对Cu/ZrO2催化剂合成甲醇性能的影响。结果表明,在较温和的条件下(温度280℃,压力8 0MPa),w(Pd)=0 35%可使CO的转化率和合成甲醇的活性显著提高,时空产率从0 31g/(ml·h)提高到0 78g/(ml·h)。程序升温还原(TPR)和程序升温脱附(TPD)的结果表明,贵金属钯的存在促进了氧化铜的还原;同时,添加钯后增强了催化剂对CO的吸附、活化作用。总之,钯改性的Cu/ZrO2催化剂促进了对氢的活化、溢流及催化剂各组分间特别是铜锆间的协同作用;另一方面,钯的添加使催化剂对CO吸附、活化能力增强,有力地削弱了CO分子中碳-氧键,使CO的反应活性增大,从而显著增加了催化剂的加氢速率。
The effect of palladium promoter on the catalytic performance of Cu/ZrO_2 catalyst for the hydrogenation of carbon monoxide was studied in this work. Carbon monoxide conversion and methanol yield were improved markedly with the addition of a low concentration of precious metal Pd. Temperature-programmed reduction and temperature-programmed desorption techniques revealed that Pd enhanced copper oxide reduction while Cu inhibits reduction of Pd species; simultaneously, the presence of palladium improved the adsorption and activation of CO molecular adsorbed on the surface of catalyst. In conclusion, the importance of the palladium incorporated to the Cu/ZrO_2 catalyst in determining the catalytic activity was related to the relative ease with which hydrogen is dissociated on the Pd particles and then spilt over the Cu and ZrO_2 phase of the base catalyst, and the stronger capability of activating CO molecular.
出处
《天然气化工—C1化学与化工》
CAS
CSCD
北大核心
2004年第4期5-10,共6页
Natural Gas Chemical Industry
基金
上海市重大科技项目
国家重点基础研究发展规划项目 (G1 9990 2 2 40 4)
