Amorphous Boron Dispersed in LaCoO<sub>3</sub> with Large Oxygen Vacancies for Efficient Catalytic Propane Oxidation
Yingbin Zheng, Yinye Chen, Enhui Wu, Xinping Liu, Baoquan Huang, Hun Xue, Changlin Cao, Yongjin Luo, Qingrong Qian, Qinghua Chen
Abstract
Abstract Unsatisfactory oxygen mobility is a considerable barrier to the development of perovskites for low‐temperature volatile organic compounds (VOCs) oxidation. This work introduced small amounts of dispersed non‐metal boron into the LaCoO 3 crystal through an easy sol‐gel method to create more oxygen defects, which are conducive to the catalytic performance of propane (C 3 H 8 ) oxidation. It reveals that moderate addition of boron successfully induces a high distortion of the LaCoO 3 crystal, decreases the perovskite particle size, and produces a large proportion of bulk Co 2+ species corresponding to abundant oxygen vacancies. Additionally, surface Co 3+ species, as the acid sites, which are active for cleaving the C−H bonds of C 3 H 8 molecules, are enriched. As a result, the LCB‐7 (molar ratio of Co/B=0.93:0.07) displays the best C 3 H 8 oxidation activity. Simultaneously, the above catalyst exhibits superior thermal stability against CO 2 and H 2 O, lasting 200 h. This work provides a new strategy for modifying the catalytic VOCs oxidation performance of perovskites by the regulation of amorphous boron dispersion.