Tandem propane dehydrogenation and surface oxidation catalysts for selective propylene synthesis

Author:

Wang Wei123ORCID,Chen Sai13,Pei Chunlei13ORCID,Luo Ran123,Sun Jiachen13,Song Hongbo13ORCID,Sun Guodong13,Wang Xianhui13,Zhao Zhi-Jian13ORCID,Gong Jinlong123ORCID

Affiliation:

1. Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China.

2. Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City, Fuzhou 350207, China.

3. Collaborative Innovation Center for Chemical Science and Engineering (Tianjin), Tianjin 300072, China.

Abstract

Direct propane dehydrogenation (PDH) to propylene is a desirable commercial reaction but is highly endothermic and severely limited by thermodynamic equilibrium. Routes that oxidatively remove hydrogen as water have safety and cost challenges. We coupled chemical looping–selective hydrogen (H 2 ) combustion and PDH with multifunctional ferric vanadate–vanadium oxide (FeVO 4 -VO x ) redox catalysts. Well-dispersed VO x supported on aluminum oxide (Al 2 O 3 ) provides dehydrogenation sites, and adjacent nanoscale FeVO 4 acts as an oxygen carrier for subsequent H 2 combustion. We achieved an integral performance of 81.3% propylene selectivity at 42.7% propane conversion at 550°C for 200 chemical looping cycles for the reoxidization of FeVO 4 . Based on catalytic experiments, spectroscopic characterization, and theory calculations, we propose a hydrogen spillover–mediated coupling mechanism. The hydrogen species generated at the VO x sites migrated to adjacent FeVO 4 for combustion, which shifted PDH toward propylene. This mechanism is favored by the proximity between the dehydrogenation and combustion sites.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3