Optimizing zeolite stabilized Pt-Zn catalysts for propane dehydrogenation

IF 14.9 1区化学 Q1 CHEMISTRY, APPLIED

能源化学 Pub Date : 2021-06-01 Epub Date: 2020-09-08 DOI:10.1016/j.jechem.2020.08.058

Linjun Xie , Yuchao Chai , Lanlan Sun , Weili Dai , Guangjun Wu , Naijia Guan , Landong Li

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引用次数: 39

Abstract

Propane dehydrogenation (PDH) provides an alternative route to non-petroleum based propylene and eligible catalysts with good overall performance are still being explored. Herein, we report the construction of zeolite stabilized Pt-Zn catalysts Pt-Zn/Si-Beta for PDH. Characterization results from transmission electron microscopy (TEM), ultraviolet–visible (UV–vis) and Fourier transform infrared (FTIR) spectroscopy reveal that highly-dispersed Zn species are stabilized by the silanols from zeolite framework dealumination, which then act as the anchoring sites for Pt species. The close contact between Pt-Zn species and the electronic interaction thereof make Pt-Zn/Si-Beta robust PDH catalysts. Under optimized conditions, a high propylene production rate of 4.11 $m o l {m o l}_{P t}^{- 1} s^{- 1}$ , high propylene selectivity of 98% and a sustainable deactivation rate of ~ 0.02 h⁻¹ can be simultaneously achieved at 823 K. Coke deposition is not the key reason for the catalytic deactivation, while the loss of Zn species and the resulting aggregation of Pt species under high temperatures are responsible for the irreversible deactivation of Pt-Zn/Si-Beta catalyst in PDH reaction.

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沸石稳定Pt-Zn丙烷脱氢催化剂的优化

丙烷脱氢(PDH)为非石油基丙烯提供了一种替代途径，综合性能良好的催化剂仍在探索中。本文报道了沸石稳定Pt-Zn催化剂Pt-Zn/Si-Beta用于PDH的构建。透射电镜(TEM)、紫外-可见(UV-vis)和傅里叶变换红外(FTIR)光谱的表征结果表明，沸石骨架脱铝产生的硅烷醇稳定了高度分散的Zn，然后作为Pt的锚定位点。Pt-Zn之间的密切接触及其电子相互作用使Pt-Zn/Si-Beta成为强大的PDH催化剂。在此条件下，在823 K温度下，丙烯的产率为4.11 molmolPt-1s-1，丙烯选择性为98%，持续失活率为~ 0.02 h−1。焦炭沉积并不是催化失活的主要原因，而高温下Zn的损失和Pt的聚集是PDH反应中Pt-Zn/Si-Beta催化剂不可逆失活的主要原因。

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

能源化学

CiteScore

23.60

自引率

0.00%

发文量

2875