Enhancement of catalytic toluene combustion over Pt-Co3O4 catalyst through in-situ metal-organic template conversion

Mingyuan Zhang; Sibei Zou; Shengpeng Mo; Jinping Zhong; Dongdong Chen; Quanming Ren; Mingli Fu; Peirong Chen; Daiqi Ye

doi:10.1016/j.chemosphere.2020.127738

Enhancement of catalytic toluene combustion over Pt-Co₃O₄ catalyst through in-situ metal-organic template conversion

Chemosphere. 2021 Jan:262:127738. doi: 10.1016/j.chemosphere.2020.127738. Epub 2020 Jul 21.

Authors

Mingyuan Zhang¹, Sibei Zou¹, Shengpeng Mo¹, Jinping Zhong¹, Dongdong Chen¹, Quanming Ren¹, Mingli Fu², Peirong Chen², Daiqi Ye³

Affiliations

¹ School of Environment and Energy, South China University of Technology, 510006 Guangzhou, China.
² School of Environment and Energy, South China University of Technology, 510006 Guangzhou, China; National Engineering Laboratory for VOCs Pollution Control Technology and Equipment (SCUT), 510006 Guangzhou, China; Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control (SCUT), 510006 Guangzhou, China; Guangdong Provincial Engineering and Technology Research Centre for Environmental Risk Prevention and Emergency Disposal (SCUT), 510006 Guangzhou, China.
³ School of Environment and Energy, South China University of Technology, 510006 Guangzhou, China; National Engineering Laboratory for VOCs Pollution Control Technology and Equipment (SCUT), 510006 Guangzhou, China; Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control (SCUT), 510006 Guangzhou, China; Guangdong Provincial Engineering and Technology Research Centre for Environmental Risk Prevention and Emergency Disposal (SCUT), 510006 Guangzhou, China. Electronic address: cedqye@scut.edu.cn.

PMID: 32763575
DOI: 10.1016/j.chemosphere.2020.127738

Abstract

A Pt-Co₃O₄ catalyst named Pt-Co(OH)₂-O was prepared by metal-organic templates (MOTs) conversion and used for catalytic oxidation of toluene. Through the conversion, the morphology of catalysts transformed from rhombic dodecahedron to nanosheet and the coated Pt nanoparticles (NPs) were more exposed. The Binding energy shift in XPS test indicates that the strong metal-support strong interaction (SMSI) has enhanced, and the physicochemical changes caused by it are characterized by other techniques. At the same time, Pt-Co(OH)₂-O showed the best catalytic performance (T₅₀ = 157 °C, T₉₀ = 167 °C, E_a = 40.85 kJ mol^-1, TOF_Pt = 2.68 × 10^-3 s^-1) and good stability. In addition, the in situ Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) studies have shown that because SMSI weakened the Co-O bond, the introduction of Pt NPs can make the migration of oxygen in the catalyst easier. The change of binding energy change and the content of various species in the quasi in situ XPS experiment further confirmed that the Pt-Co(OH)₂-O catalyst has stronger SMSI, resulting in its stronger electron transfer ability and oxygen migration ability, which is conducive to catalytic reactions. This work provides new ideas for the development of supported catalysts and provides a theoretical reference for the relevant verification of SMSI.

Keywords: Metal-organic templates conversion; Pt–Co(3)O(4) catalysts; Quasi in situ XPS; Strong metal-support interaction.

MeSH terms

Catalysis
Cobalt / chemistry*
Environmental Pollutants / chemistry
Metal Nanoparticles / chemistry*
Oxidation-Reduction
Oxides / chemistry*
Oxygen / chemistry
Photoelectron Spectroscopy
Platinum / chemistry
Spectroscopy, Fourier Transform Infrared
Toluene / chemistry*

Substances

Environmental Pollutants
Oxides
cobalt tetraoxide
Toluene
Cobalt
Platinum
Oxygen
cobalt oxide