Open AccessModification of Metal (Fe, Al) Doping on Reaction Properties of a NiO Oxygen Carrier with CO during Chemical Looping Combustion
Author(s) -
Shubo Chen,
Wenguo Xiang,
Shiyi Chen
Publication year - 2022
Publication title -
acs omega
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.779
H-Index - 40
ISSN - 2470-1343
DOI - 10.1021/acsomega.1c06182
Subject(s) - non blocking i/o , chemical looping combustion , doping , oxygen , materials science , metal , steric effects , reactivity (psychology) , density functional theory , activation energy , chemical reaction , surface modification , inorganic chemistry , chemistry , chemical engineering , catalysis , computational chemistry , stereochemistry , metallurgy , organic chemistry , medicine , alternative medicine , optoelectronics , pathology , engineering
Oxygen carriers can significantly enhance the performance of chemical looping combustion at low energy-cost CO 2 capture. Based on the density functional theory, a microscopic model of the metal Fe, Al-doped NiO oxygen carrier was established. The results indicate that the intermediate state energy and the reaction energy reduce due to electronic interaction of the Al-doped surface. With the progress of the reaction, the NiO-Al surface promotes the oxidation process of CO, indicating that the activity of the NiO surface enhanced, which is attributed to the electronic and steric effects of the Al-O structure. For the decomposition of CO on the OC surface, doping with other atoms is beneficial to suppress the carbon deposition, which is related to the steric hindrance caused by doping with other atoms. Besides, doping with iron and aluminum atoms is more conducive to the movement of OC bulk crystal lattice oxygen to the surface, thereby promoting subsequent reactions. Therefore, it is feasible to improve the reactivity of the Ni-based OC by doping metal Al, and its modification effect is closely related to the characteristics of the components.