当前位置: X-MOL 学术ACS Catal. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Fundamental Aspects of Enhancing Low-Temperature CO2 Splitting to CO on a Double La2NiFeO6 Perovskite
ACS Catalysis ( IF 12.9 ) Pub Date : 2021-09-17 , DOI: 10.1021/acscatal.1c03398
Hyun Suk Lim 1 , Yikyeom Kim 1 , Dohyung Kang 2 , Minbeom Lee 1 , Ayeong Jo 1 , Jae W. Lee 1
Affiliation  

This paper addresses the synergistic effect of binary Ni–Fe sites in double La2NiFeO6 perovskite on low-temperature CO2 conversion to CO in the reverse water–gas shift-chemical looping process. Experimental investigations and DFT calculations proved that, for the reduction of perovskite, the Ni-site facilitates the formation of surface oxygen vacancies and the adsorption of hydrogen with agile lattice oxygen mobility. Thus, incorporating Ni can improve the reducibility at low temperature. The Fe-site prevents strong adsorption of the CO2 molecules on the La-site to facilitate its direct dissociation into CO molecules, and thereby CO2 conversion increases with Fe loading. Consequently, La2NiFeO6 can satisfy both high reducibility and CO2 splitting activity by the synergy of binary Ni–Fe sites. It presents an average CO productivity of 2.14 mmol/gcat and a maximum CO production rate of 1.69 mmol/gcat·min at 700 °C, more than 4.7-fold and 10-fold higher than each single LaNiO3 and LaFeO3 perovskites, respectively.

中文翻译:

在双 La2NiFeO6 钙钛矿上促进低温 CO2 分裂为 CO 的基本方面

本文讨论了双 La 2 NiFeO 6钙钛矿中二元 Ni-Fe 位点对逆向水-气变换-化学循环过程中低温 CO 2转化为 CO的协同作用。实验研究和 DFT 计算证明,对于钙钛矿的还原,Ni 位点有利于表面氧空位的形成和氢的吸附,并且具有灵活的晶格氧迁移率。因此,加入Ni可以提高低温还原性。Fe位阻止CO 2分子在La位上的强吸附以促进其直接解离为CO分子,从而CO 2转化率随着Fe负载而增加。因此,La 2NiFeO 6可以通过二元Ni-Fe位点的协同作用同时满足高还原性和CO 2裂解活性。它在 700 °C 下的平均 CO 生产率为 2.14 mmol/g cat,最大 CO 生产率为 1.69 mmol/g cat ·min,比单独的 LaNiO 3和 LaFeO 3钙钛矿分别高出 4.7 倍和 10 倍以上, 分别。
更新日期:2021-10-01
down
wechat
bug