Ruthenium/cobalt binary oxides supported on hollow alumina microspheres as highly efficient catalyst for vinyl chloride oxidation

• Published in: Applied surface science Vol. 497; p. 143776
• Main Authors: Wang, Chao, Liu, Na, Zhang, Chuanhui, Liu, Xuehua, Li, Xingyun, Zhao, X.S.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.12.2019
• Subjects: Aluminium oxide; Anti-sintering ability; Binary metal oxides; Catalytic oxidation; Hollow microsphere; Aluminium oxide; Hollow microsphere; Catalytic oxidation; Anti-sintering ability; Binary metal oxides
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2019.143776

Alumina hollow microspheres (Al2O3-hms) were synthesized and used to support metal oxide and binary metal oxide particles to prepare three catalysts, designated as RuOx/Al2O3-hms, CoOx/Al2O3-hms and RuCoOx/Al2O3-hms. Their catalytic properties in vinyl chloride oxidation were investigated and found to follow this order: RuCoOx/Al2O3-hms > RuOx/Al2O3-hms > CoOx/Al2O3-hms. In comparison with a commercial Al2O3 support, the Al2O3-hms provide a higher specific surface area and unique hollow spherical morphology, benefiting for uniform distribution of catalyst particles. It was also found that the strong metal-support interaction between metal nanoparticles and Al2O3-hms has significant effects on the low-temperature reducibility, the surface oxygen abundance and mobility, giving rise to different oxidation activities. The Al2O3-hms supported metal catalysts remained relatively high catalytic activity after consecutive catalytic runs and high-temperature annealing. The anti-sintering ability enhancement of metal particles was attributed to the stabilization and metal-support interaction effects with Al2O3-hms. •Al2O3 hollow microspheres were prepared as supports by hydrothermal synthesis.•The unique nanosheets devote to good surface distribution of metal oxides.•It presents a strong metal-support interaction between metal nanoparticles and Al2O3.•The RuCoOx/Al2O3-hms exhibits high catalytic activity and water resistant ability.