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author:

Wang, X. (Wang, X..) [1] | Liu, Y. (Liu, Y..) [2] | Zhang, T. (Zhang, T..) [3] | Luo, Y. (Luo, Y..) [4] | Lan, Z. (Lan, Z..) [5] | Zhang, K. (Zhang, K..) [6] | Zuo, J. (Zuo, J..) [7] | Jiang, L. (Jiang, L..) [8] | Wang, R. (Wang, R..) [9]

Indexed by:

Scopus

Abstract:

Co 3 O 4 spinel has been widely investigated as a promising catalyst for the oxidation of volatile organic compounds (VOCs). However, the roles of tetrahedrally coordinated Co 2+ sites (Co 2+ T d ) and octahedrally coordinated Co 3+ sites (Co 3+ O h ) still remain elusive, because their oxidation states are strongly influenced by the local geometric and electronic structures of the cobalt ion. In this work, we separately studied the geometrical-site-dependent catalytic activity of Co 2+ and Co 3+ in VOC oxidation on the basis of a metal ion substitution strategy, by substituting Co 2+ and Co 3+ with inactive or low-active Zn 2+ (d 0 ), Al 3+ (d 0 ), and Fe 3+ (d 5 ), respectively. Raman spectroscopy, X-ray absorption fine structure (XAFS), and in situ DRIFTS spectra were thoroughly applied to elucidate the active sites of a Co-based spinel catalyst. The results demonstrate that octahedrally coordinated Co 2+ sites (Co 2+ Oh ) are more easily oxidized to Co 3+ species in comparison to Co 2+ Td , and Co 3+ are responsible for the oxidative breakage of the benzene rings to generate the carboxylate intermediate species. CoO with Co 2+ Oh and ZnCo 2 O 4 with Co 3+ Oh species have demonstrated good catalytic activity and high TOF Co values at low temperature. Benzene conversions for CoO and ZnCo 2 O 4 are greater than 50% at 196 and 212 °C, respectively. However, CoAl 2 O 4 with Co 2+ T d sites shows poor catalytic activity and a low TOF Co value. In addition, ZnCo 2 O 4 exhibits good durability at 500 °C and strong H 2 O resistance ability. © 2017 American Chemical Society.

Keyword:

benzene oxidation; DFT calculation; ordered mesopore; spinel; sustainable chemistry

Community:

  • [ 1 ] [Wang, X.]National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou, Fujian, 350002, China
  • [ 2 ] [Liu, Y.]National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou, Fujian, 350002, China
  • [ 3 ] [Zhang, T.]National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou, Fujian, 350002, China
  • [ 4 ] [Luo, Y.]Fujian Key Laboratory of Pollution Control and Resource Reuse, Fujian Normal University, Fuzhou, 350007, China
  • [ 5 ] [Lan, Z.]National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou, Fujian, 350002, China
  • [ 6 ] [Zhang, K.]National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou, Fujian, 350002, China
  • [ 7 ] [Zuo, J.]Fujian Key Laboratory of Pollution Control and Resource Reuse, Fujian Normal University, Fuzhou, 350007, China
  • [ 8 ] [Jiang, L.]National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou, Fujian, 350002, China
  • [ 9 ] [Wang, R.]State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China

Reprint 's Address:

  • [Luo, Y.]Fujian Key Laboratory of Pollution Control and Resource Reuse, Fujian Normal UniversityChina

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Source :

ACS Catalysis

ISSN: 2155-5435

Year: 2017

Issue: 3

Volume: 7

Page: 1626-1636

1 1 . 3 8 4

JCR@2017

1 1 . 7 0 0

JCR@2023

ESI HC Threshold:226

JCR Journal Grade:1

CAS Journal Grade:2

Cited Count:

WoS CC Cited Count: 0

SCOPUS Cited Count: 310

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 1

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