Cu- and Ce-promoted nano-heterostructures on vanadate catalysts for low-temperature NH3-SCR activity with improved SO2 and water resistance

被引：47

作者：

Purbia, Rahul ^{[1
]}

Ye, Bora ^{[2
]}

Jeong, Bora ^{[2
]}

Park, Hyesung ^{[3
]}

Kim, Hong-Dae ^{[2
]}

Choi, Sung Yeol ^{[1
]}

Kim, Hee Jun ^{[1
]}

Lee, Duck Hyun ^{[2
]}

Baik, Jeong Min ^{[1
,4
]}

机构：

[1] Sungkyunkwan Univ SKKU, Sch Adv Mat Sci & Engn, 2066 Seoburo, Suwon 16419, South Korea

[2] Green Mat & Proc Grp Korea Inst Ind Technol KITECH, Ulsan 44413, South Korea

[3] Ulsan Natl Inst Sci & Technol UNIST, Sch Mat Sci & Engn, Ulsan 44919, South Korea

[4] Sungkyunkwan Univ SKKU, KIST SKKU Carbon Neutral Res Ctr, Suwon 16419, South Korea

来源：

CHEMICAL ENGINEERING JOURNAL | 2022年 / 437卷

基金：

新加坡国家研究基金会;

关键词：

CuO-CeO2; nano-heterostructures; SCR DeNOx catalysts; Low-temperature; SO2; resistance; Water resistance; Synergetic effects of catalytic and redox reactions; TIO2/CEO2; CATALYSTS; REACTION-MECHANISM; OXIDE CATALYST; CO OXIDATION; REDUCTION; NOX; NH3; PERFORMANCE; COPPER; SCR;

D O I：

10.1016/j.cej.2022.135427

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The objective of this study was to demonstrate a facile strategy for vanadate-based catalysts having high NOx conversion efficiency (similar to 96% @ 220 degrees C) and improved SO2 resistance by impregnating highly-dispersed CuO-CeO2 nano-heterostructures to V2O5-CeO2-WO3/TiO2 catalysts. The key design of catalysts was based on the maximization of interface chemistry towards synergetic effects of catalytic and redox reactions between Cu and Ce species. The impregnation of 0.1 wt% CuO-CeO2 possessed more surface acid sites and enhanced redox ability at low temperatures (180-220 degrees C). Based on Gibbs energy calculation and XPS results, thermodynamically favorable reaction of Cu2+ + Ce3+ -> Cu+ + Ce4+ made it a perfect candidate for an excellent redox system with V4+/V5+ charge imbalance proportion through electron migration at the adjacent interface. The strong redox interaction and facile electron transfer could also restrain the formation of surface sulfate species and showed an excellent SO2 and water tolerance.

引用

页数：11

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