制备方法对Pt-Sn-K-Mg/γ-Al2O3催化剂正十二烷脱氢性能的影响
Influence of Preparation Methods on n-Dodecane Dehydrogenation Performance of Pt-Sn-K-Mg/γ-Al2O3 Catalysts
王帅 1孙杰 2陈诚 2魏海国 2丑凌军 3杨建 3宋焕玲3
作者信息
- 1. 中国科学院兰州化学物理研究所羰基合成与选择氧化国家重点实验室,甘肃兰州 730000;中国科学院大学,北京 100049
- 2. 中国石油天然气股份有限公司规划总院,北京 100083
- 3. 中国科学院兰州化学物理研究所羰基合成与选择氧化国家重点实验室,甘肃兰州 730000
- 折叠
摘要
以正十二烷脱氢反应为探针反应,采用顺序浸渍、乙醇共浸渍、盐酸共浸渍的方法制备了 Pt-Sn-K-Mg/γ-Al2O3催化剂,并采用NH3-TPD、CO脉冲吸附、H2-TPR、准原位XPS等表征手段探究浸渍顺序和溶剂对催化剂构效关系的影响.结果表明,盐酸水溶液共浸渍的方法制备的催化剂表现出了最佳的初始活性和较好的稳定性.催化剂的弱酸性位点的增加有利于Pt的分散,从而提高催化性能.采用乙醇为溶剂的共浸渍方法更有利于PtSn间形成更强的相互作用生成更多的PtSn合金,这对初始活性不利,但对选择性影响较小.
Abstract
Pt-Sn-K-Mg/γ-Al2O3 catalysts were prepared by sequential impregnation,ethanol co-impregnation and hydrochloric acid co-impregnation using n-dodecane dehydrogenation as a probe reaction,and the effects of impregnation sequence and solvent on the structure-activity relationship of the catalysts were investigated by using characterization methods such as NH3-TPD,CO pulse adsorption,H2-TPR and quasi-in situ XPS.The results showed that the catalyst prepared by co-impregnation with hydrochloric acid aqueous solution exhibited the best initial activity and better stability.The increase of weakly acidic sites of the catalyst facilitated the dispersion of Pt,which improved the catalytic performance.The co-impregnation method using ethanol as the solvent is more favorable to the formation of stronger interactions between PtSn to generate more PtSn alloys,which is unfavorable to the initial activity but has less effect on the selectivity.
关键词
长链烷烃/脱氢/PtSn合金/浸渍顺序/溶剂效应Key words
long-chain alkanes/dehydrogenation/PtSn alloy/impregnation sequence/solvent effect引用本文复制引用
出版年
2024
NETL
NSTL
万方数据