Design and optimization of CuCo-LDO catalysts via ZIF-67 sacrificial templates for enhanced toluene oxidation: A comprehensive study on morphology, structure, and catalytic activity

• Published in: Molecular catalysis Vol. 560; p. 114113
• Main Authors: Xu, Yang, Chen, Jinghuan, Ye, Zhiping, Wang, Jiade
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.05.2024
• Subjects: Catalytic oxidation; CuCo-LDO; Volatile organic compounds; ZIF-67; Volatile organic compounds; Catalytic oxidation; CuCo-LDO; ZIF-67
• ISSN: 2468-8231; 2468-8231
• DOI: 10.1016/j.mcat.2024.114113

•CuCo layered double oxides are synthesized via chemical etching of ZIF-67 crystals.•The CuCo LDOs are designed with controllable morphology and tunable composition.•Excellent toluene oxidation activity is obtained over the flower-like 3CuCo-LDO.•The synergy between Co3O4 and CuO played a pivotal role in the oxidation reaction. The investigation into the development of an active transition-metal oxide catalyst with controllable morphology for the degradation of volatile organic compounds (VOCs) is a subject of considerable importance and warrants further exploration. In this study, ZIF-67 was prepared and employed as a sacrificial template, with varying quantities of Cu ions incorporated to synthesize layered copper-cobalt double oxide (CuCo-LDO) featuring a modifiable surface state. A comprehensive characterization of the CuCo-LDO catalysts was conducted, encompassing structural properties, morphology, surface chemical state, and redox properties, utilizing a range of analytical techniques. Subsequent evaluations included testing the catalytic activity for toluene oxidation and assessing stability performance. The results revealed that differing Cu contents played a pivotal role in inducing changes in the morphology and structure of CuCo-LDO, thereby significantly influencing its oxidation activity towards toluene. Notably, the flower-like structure of 3CuCo-LDO (Cu% = 20.14 wt.%) exhibited outstanding toluene oxidation activity attributable to its unique structure and composition. This research contributes novel insights to the design of highs-performance catalysts targeting volatile organic compounds. [Display omitted]