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author:

Zhang, Jiangjie (Zhang, Jiangjie.) [1] | Zhang, Junhui (Zhang, Junhui.) [2] | Shen, Jinni (Shen, Jinni.) [3] (Scholars:沈锦妮) | Li, Dongmiao (Li, Dongmiao.) [4] | Long, Jinlin (Long, Jinlin.) [5] (Scholars:龙金林) | Dai, Wenxin (Dai, Wenxin.) [6] (Scholars:戴文新) | Wang, Xuxu (Wang, Xuxu.) [7] (Scholars:王绪绪) | Zhang, Zizhong (Zhang, Zizhong.) [8] (Scholars:张子重)

Indexed by:

EI Scopus SCIE

Abstract:

Photocatalytic oxidative coupling of methane (POCM) is a direct way for the methane transformation into >= C2 alkanes. However, the typical oxygen activation path often leads to the formation of strong oxidizing superoxide radical (O-2(-)) species, which makes the whole reaction face serious selectivity problems. Herein, we constructed N and oxygen vacancy dual active sites on TiO2{001} nanosheets (TiO2-NVo) to regulate the oxygen activation pathway and achieve a high activity and selectivity of photocatalytic OCM. Compared with ordinary Au/TiO2{001} nanosheets, the alkane yields of Au/TiO2-NVo are increased from 16 mu mol h(-1) to 32 mu mol h(-1), and the selectivity of alkanes increased from 61% to 93%. The performance is superior when compared with the reported till date in photocatalytic OCM in batch reactors. The superior performance originates from the unique N-V-o dual active sites for synergistically cleaving the detrimental O-2(-) into desirable mono-oxygen active species (O-) to suppress undesired overoxidation reaction. The formed O- species from O-2(-) dissociation, in turn, is active for the selective H abstraction of CH4 into center dot CH3 to improve the subsequent C-C coupling reaction on the Au nanocluster surface. This work provides a new approach of O-2 dissociation to address the overoxidation of methane in an aerobic environment for achieving highly selective CH4 conversion.

Keyword:

dual sites high selectivity O-2 dissociation oxidative coupling of methane photocatalysis

Community:

  • [ 1 ] [Zhang, Jiangjie]Fuzhou Univ, Coll Chem, State Key Lab Photocatalysis Energy & Environm, Fuzhou 350106, Peoples R China
  • [ 2 ] [Zhang, Junhui]Fuzhou Univ, Coll Chem, State Key Lab Photocatalysis Energy & Environm, Fuzhou 350106, Peoples R China
  • [ 3 ] [Shen, Jinni]Fuzhou Univ, Coll Chem, State Key Lab Photocatalysis Energy & Environm, Fuzhou 350106, Peoples R China
  • [ 4 ] [Li, Dongmiao]Fuzhou Univ, Coll Chem, State Key Lab Photocatalysis Energy & Environm, Fuzhou 350106, Peoples R China
  • [ 5 ] [Long, Jinlin]Fuzhou Univ, Coll Chem, State Key Lab Photocatalysis Energy & Environm, Fuzhou 350106, Peoples R China
  • [ 6 ] [Dai, Wenxin]Fuzhou Univ, Coll Chem, State Key Lab Photocatalysis Energy & Environm, Fuzhou 350106, Peoples R China
  • [ 7 ] [Wang, Xuxu]Fuzhou Univ, Coll Chem, State Key Lab Photocatalysis Energy & Environm, Fuzhou 350106, Peoples R China
  • [ 8 ] [Zhang, Zizhong]Fuzhou Univ, Coll Chem, State Key Lab Photocatalysis Energy & Environm, Fuzhou 350106, Peoples R China
  • [ 9 ] [Dai, Wenxin]Qingyuan Innovat Lab, Quanzhou 362801, Peoples R China
  • [ 10 ] [Zhang, Zizhong]Qingyuan Innovat Lab, Quanzhou 362801, Peoples R China

Reprint 's Address:

  • 张子重

    [Zhang, Zizhong]Fuzhou Univ, Coll Chem, State Key Lab Photocatalysis Energy & Environm, Fuzhou 350106, Peoples R China;;[Zhang, Zizhong]Qingyuan Innovat Lab, Quanzhou 362801, Peoples R China

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Source :

ACS CATALYSIS

ISSN: 2155-5435

Year: 2024

Issue: 6

Volume: 14

Page: 3855-3866

1 1 . 7 0 0

JCR@2023

CAS Journal Grade:1

Cited Count:

WoS CC Cited Count: 7

SCOPUS Cited Count: 7

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 0

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