Electronic structure of heterojunction MoO2/g-C3N4 catalyst for oxidative desulfurization

被引：210

作者：

Chen, Kun ^{[1
]}

Zhang, Xiao-Min ^{[2
]}

Yang, Xian-Feng ^{[1
]}

Jiao, Meng-Gai ^{[1
]}

Zhou, Zhen ^{[1
]}

Zhang, Ming-Hui ^{[2
]}

Wang, Dan-Hong ^{[1
]}

Bu, Xian-He ^{[1
,2
]}

机构：

[1] Nankai Univ, Sch Mat Sci & Engn, TKL Met & Mol Based Mat Chem, Natl Inst Adv Mat, Tianjin 300350, Peoples R China

[2] Nankai Univ, Key Lab Adv Energy Mat Chem, Minist Educ, Coll Chem, Tianjin 300071, Peoples R China

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2018年 / 238卷

基金：

中国国家自然科学基金;

关键词：

MoO2; g-C3N4; heterojunction; Electron transfer; Oxidative desulfurization; Mechanism; DEEP DESULFURIZATION; PERFORMANCE; PHOTOCATALYST; DIBENZOTHIOPHENE; SPECTROSCOPY; COMPOSITES; BEHAVIOR; POINTS; WATER; MOO2;

D O I：

10.1016/j.apcatb.2018.07.037

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Electronic structure of active sites plays a crucial role in redox catalysts. Herein, graphitic carbon nitride (g-C3N4) decorated with metallic MoO2 heterojunction nanocomposites were successfully synthesized through a facile calcination route. XPS, UPS, UV-vis and PL spectra results suggest electron transfer from the conduction band (CB) of g-C3N4 to unfilled pi* band of metallic MoO2 in the metal-semiconductor heterojunction. The electron transfer ensures high intrinsic oxidative desulfurization activity for MoO2/g-C3N4 composites. Radical scavenger experiments indicate that the electron transfer facilitates the enrichment of electron density around Mo active sites and control the rate-determining step of oxidative desulfurization. The approach can be extended to other low valent transition metal oxides possessing d electrons for enhanced catalytic activity in redox reactions.

引用

页码：263 / 273

页数：11