Selective corrosion of LaCoO3 by NaOH: structural evolution and enhanced activity for benzene oxidation. Issue 2 (11th January 2017)

• Record Type: Journal Article
• Authors: Luo, Yongjin; Wang, Kuncan; Zuo, Jiachang; Qian, Qingrong; Xu, Yuxian; Liu, Xinping; Xue, Hun; Chen, Qinghua
• Is Part Of: Catalysis science & technology. Volume 7:Issue 2(2017)
• Page Start: 496
• Page End: 501
• Publication Date: 2017-01-11
• Subjects: Catalysis -- Periodicals; 541.395
• DOI: 10.1039/c6cy02489k
• Languages: English
• ISSNs: 2044-4753

Abstract

Abstract : NaOH corrosion of electrospun LaCoO3 shows enhanced benzene oxidation activity due to mutual effects among La2 O3, Co3 O4 and LaCoO3 . Abstract : La(OH)3 nanosheets have been successfully coated on electrospun LaCoO3 nanorods using a simple and facile corrosion process, where La cations are selectively precipitated using NaOH. During the oxidation process, La(OH)3 is converted to La2 O3 having a mutual effect with the spontaneously generated Co3 O4 and the predominant LaCoO3 component. The performances for catalytic benzene oxidation and characterization results indicate that the alkaline treatment of electrospun LaCoO3 can improve the apparent catalytic activity because more surface adsorbed oxygen species and exposed Co 3+ are generated. However, if the treatment time reaches 9 h, over-deposition of La(OH)3 /La2 O3 species on the surface may cause a large fraction of active Co species to be inaccessible, resulting in a lower specific activity (2.9 × 10 −6 molC6 H6 m −2 h −1 ) compared to that of untreated LaCoO3 (4.8 × 10 −6 molC6 H6 m −2 h −1 ). A treatment time of 3 h provides the highest specific activity, 1.01 × 10 −5 molC6 H6 m −2 h −1 . Moreover, the obtained catalyst shows deactivation of only 3% benzene conversion in a stability test at 450 °C for 48 h. Therefore, NaOH-treated LaCoO3 is a promising catalyst for the practical removal of volatile organic compounds due to its high efficiency, good stability, and convenient preparation.