Effect of cerium addition on catalytic performance of PtSnNa/ZSM-5 catalyst for propane dehydrogenation

• Published in: Journal of natural gas chemistry 2012-05, Vol.21 (3), p.324-331
• Main Authors: Xue, Mengwei, Zhou, Yuming, Zhang, Yiwei, Liu, Xuan, Duan, Yongzheng, Sheng, Xiaoli
• Format: Article
• Language: English
• Subjects: Applied sciences; Catalysis; catalyst; Catalysts; Catalysts: preparations and properties; Cerium; Chemisorption; Chemistry; Dehydrogenation; Energy; Exact sciences and technology; Fuels; Gas conditioning and treatments. Desulphurization. Liquefaction; Gas industry; General and physical chemistry; Metal particles; NH3-TPD; Propane; propane dehydrogenation; Pt-Sn; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; X-ray photoelectron spectroscopy; X射线光电子能谱; X射线衍射; ZSM-5催化剂; 丙烷脱氢; 催化性能; 脱氢催化剂; 铈
• ISSN: 1003-9953
• DOI: 10.1016/s1003-9953(11)60372-1

The effect of cerium addition on the catalytic performance of propane dehydrogenation over PtSnNaIZSM-5 catalyst has been investigated by reaction tests and some physicochemical characterization such as XRD, BET, TEM, XPS, NH3-TPD, H2 chemisorption, TPR and TPO techniques. It has been found that with suitable amount of cerium addition, the platinum dispersion increased, while the carbon deposition tended to be eliminated easily. In these cases, the presence of cerium could not only realize the better distribution of metallic particles on the support, but also strengthen the interactions between Sn species and the support. Additionally, XPS spectra confirmed that more amounts of tin could exist in oxidized form, which was advantageous to the reaction. In our experiments, PtSnNaCe （1.1 wt%）/ZSM-5 catalyst exhibited the best catalytic performance. After running the reaction for 750 h, propane conversion was maintained higher than 30% with the corresponding selectivity to propylene of about 97%.