Amorphous Boron Dispersed in LaCoO3 with Large Oxygen Vacancies for Efficient Catalytic Propane Oxidation. Issue 14 (3rd February 2021)

• Record Type: Journal Article
• Authors: Zheng, Yingbin; Chen, Yinye; Wu, Enhui; Liu, Xinping; Huang, Baoquan; Xue, Hun; Cao, Changlin; Luo, Yongjin; Qian, Qingrong; Chen, Qinghua
• Is Part Of: Chemistry. Volume 27:Issue 14(2021)
• Page Start: 4738
• Page End: 4745
• Publication Date: 2021-02-03
• Subjects: amorphous boron dispersion -- catalytic propane oxidation -- durability -- LaCoO3 -- oxygen vacancies; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.202004848
• Languages: English
• ISSNs: 0947-6539

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 LaCoO3 crystal through an easy sol‐gel method to create more oxygen defects, which are conducive to the catalytic performance of propane (C3 H8 ) oxidation. It reveals that moderate addition of boron successfully induces a high distortion of the LaCoO3 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 C3 H8 molecules, are enriched. As a result, the LCB‐7 (molar ratio of Co/B=0.93:0.07) displays the best C3 H8 oxidation activity. Simultaneously, the above catalyst exhibits superior thermal stability against CO2 and H2 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. Abstract : Boron‐induced oxygen defects : Unsatisfactory oxygen mobility is a barrier to the development of perovskites for low‐temperature volatile organic compound oxidation. This work introduces small amounts of dispersed non‐metal boron into the LaCoO3 crystal through an easy sol‐gel method to create more oxygen defects. The resulting Co 3+ rich surface and large oxygen vacancies realized with the amorphous boron dispersed in LaCoO3 shows efficient propane oxidation activity.