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

Journal of Natural Gas Chemistry Pub Date : 2012-05-01 DOI:10.1016/S1003-9953(11)60372-1

Mengwei Xue , Yuming Zhou , Yiwei Zhang , Xuan Liu , Yongzheng Duan , Xiaoli Sheng

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引用次数: 16

Abstract

The effect of cerium addition on the catalytic performance of propane dehydrogenation over PtSnNa/ZSM-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%.

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铈对PtSnNa/ZSM-5催化剂丙烷脱氢性能的影响

通过反应试验和XRD、BET、TEM、XPS、NH3-TPD、H2化学吸附、TPR、TPO等理化表征技术，研究了铈对PtSnNa/ZSM-5催化剂丙烷脱氢催化性能的影响。研究发现，适当的铈添加量增加了铂的分散性，而碳沉积容易消除。在这些情况下，铈的存在不仅可以实现金属颗粒在载体上更好的分布，而且可以加强锡种与载体的相互作用。此外，XPS光谱证实了更多的锡可以以氧化形式存在，这有利于反应。在我们的实验中，PtSnNaCe (1.1 wt%)/ZSM-5催化剂表现出最好的催化性能。反应750 h后，丙烷转化率保持在30%以上，丙烯的选择性约为97%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Natural Gas Chemistry 化学-工程：化工

自引率

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审稿时长

2 months