Macroporous Ni foam-supported Co3O4 nanobrush and nanomace hybrid arrays for high-efficiency CO oxidation

Shengpeng Mo; Hui He; Quanming Ren; Shuangde Li; Weixia Zhang; Mingli Fu; Limin Chen; Junliang Wu; Yunfa Chen; Daiqi Ye

doi:10.1016/j.jes.2018.02.026

Macroporous Ni foam-supported Co₃O₄ nanobrush and nanomace hybrid arrays for high-efficiency CO oxidation

J Environ Sci (China). 2019 Jan:75:136-144. doi: 10.1016/j.jes.2018.02.026. Epub 2018 Mar 17.

Authors

Shengpeng Mo¹, Hui He¹, Quanming Ren¹, Shuangde Li², Weixia Zhang¹, Mingli Fu³, Limin Chen³, Junliang Wu³, Yunfa Chen⁴, Daiqi Ye⁵

Affiliations

¹ School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
² State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
³ School of Environment and Energy, South China University of Technology, Guangzhou 510006, China; Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control (SCUT), Guangzhou 510006, China; Guangdong Provincial Engineering and Technology Research Centre for Environmental Risk Prevention and Emergency Disposal, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China.
⁴ State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; Center for Excellence in Urban Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China. Electronic address: yfchen@ipe.ac.cn.
⁵ School of Environment and Energy, South China University of Technology, Guangzhou 510006, China; Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control (SCUT), Guangzhou 510006, China; Guangdong Provincial Engineering and Technology Research Centre for Environmental Risk Prevention and Emergency Disposal, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China. Electronic address: cedqye@scut.edu.cn.

PMID: 30473278
DOI: 10.1016/j.jes.2018.02.026

Abstract

Herein, we reported the synthesis of well-defined Co₃O₄ nanoarrays (NAs) supported on a monolithic three-dimensional macroporous nickel (Ni) foam substrate for use in high-efficiency CO oxidation. The monolithic Co₃O₄ NAs catalysts were obtained through a generic hydrothermal synthesis route with subsequent calcination. By controlling the reaction time, solvent polarity and deposition agent, these Co₃O₄ NAs catalysts exhibited various novel morphologies (single or hybrid arrays), whose physicochemical properties were further characterized by using several analytical techniques. Based on the catalytic and characterization analyses, it was found that the Co₃O₄ NAs-6 catalyst with nanobrush and nanomace arrays displayed enhanced catalytic activity for CO oxidation, achieving an efficient 100% CO oxidation conversion at a gas hourly space velocity (GHSV) 10,000hr^-1 and 150°C with long-term stability. Compared with the other Co₃O₄ NAs catalysts, it had the highest abundance of surface-adsorbed oxygen species, excellent low-temperature reducibility and was rich in surface-active sites (Co³⁺/Co²⁺=1.26).

Keywords: CO oxidation; Co(3)O(4); Hybrid arrays; Macroporous Ni foam; Nanomace.

MeSH terms

Adsorption
Carbon Monoxide / chemistry*
Cobalt / chemistry*
Models, Chemical*
Nickel / chemistry*
Oxidation-Reduction
Oxides / chemistry*

Substances

Oxides
Cobalt
Nickel
Carbon Monoxide
cobalt oxide