Synergy between the proton conducting and a mixed electronic and oxygen ionic conducting phases in a composite anode for electrocatalytic propane ODH
Synergy between the proton conducting and a mixed electronic and oxygen ionic conducting phases in a composite anode for electrocatalytic propane ODH
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DOI：
10.1016/j.apcata.2023.119169
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发表时间：
2023-04-04
影响因子：
5.5
通讯作者：
Ozkan，Umit S.
中科院分区：
文献类型：
--
作者：
Kim，Jaesung;Deka，Dhruba J.;Ozkan，Umit S.
丙烷氧化脱氢（ODH）是提高丙烯产量以满足日益增长的需求的一种有吸引力和可行的方法。本文研究了质子导电SrCe0.95Yb0.05O3（SCY）和氧离子电子混合导电（La0.8Sr0.2）0.95MnO3（LSM）组成的双相催化剂用于丙烷ODH。利用TPD-DRIFTS研究了SCY表面的H2O吸附和碱性晶格氧的存在。在LSM中加入40%的SCY，可以显著提高丙烷转化率和烯烃选择性。这些增强可能是由于SCY表面的高度碱性，有助于丙烯的快速解吸，从而提高丙烯的产量。此外，质子导电的SCY有助于从丙烷中提取质子并将其传输到SCY和LSM之间的界面，从而发生氧化反应。用c3h8和c3h6进行的TPrxn实验表明，丙烷选择性转化为烯烃需要适度的氧离子电导率和催化剂的碱性表面。
Oxidative dehydrogenation (ODH) of propane offers an attractive and feasible method for increasing propylene production to meet the growing demand. In this study, a dual phase catalyst composed of proton conducting SrCe0.95Yb0.05O3(SCY) and mixed oxygen ionic and electronic conducting (La0.8Sr0.2)0.95MnO3(LSM) has been investigated for propane ODH. TPD-DRIFTS was used to study H2O adsorption and the presence of basic lattice oxygen on the surface of SCY. The addition of 40 wt% SCY to LSM resulted in significant improvements in propane conversion and olefin selectivity. These enhancements were likely due to the highly basic nature of the SCY surface by helping rapid desorption of propylene resulting in high propylene yields. In addition, proton conductive SCY facilitated the proton abstraction from propane and its transport to the interface between SCY and LSM where an oxidation reaction occurs. It was demonstrated by TPrxn experiments using C3H8and C3H6that a moderate oxygen ionic conductivity and a basic surface of the catalyst are needed for the selective conversion of propane to olefins.