Effect of the support material of IrRu catalysts on CO-assisted NOx reduction

被引：8

作者：

Arshad, Malik Waqar ^{[1
,2
]}

You, Young-Woo ^{[3
]}

Kim, Young Jin ^{[3
]}

Heo, Iljeong ^{[2
,3
]}

Kim, Seok Ki ^{[4
,5
]}

机构：

[1] Korea Res Inst Chem Technol KRICT, Gas & Carbon Convergent Res Ctr C1, Daejeon 34114, South Korea

[2] Univ Sci & Technol, Adv Mat & Chem Engn Technol UST, Daejeon 34113, South Korea

[3] Korea Res Inst Chem Technol KRICT, Environm & Sustainable Resources Res Ctr, Daejeon 34114, South Korea

[4] Ajou Univ, Dept Energy Syst Res, Suwon 16499, South Korea

[5] Ajou Univ, Dept Chem Engn, Suwon 16499, South Korea

来源：

CHEMICAL ENGINEERING JOURNAL | 2023年 / 455卷

基金：

新加坡国家研究基金会;

关键词：

Selective catalytic reduction; NO reduction; CO oxidation; strong metal-support interaction (SMSI); Structure sensitivity; TIO2; 001; SURFACE; DFT; OXIDATION; ADSORPTION; SIZE; AU/TIO2; OXIDE;

D O I：

10.1016/j.cej.2022.140911

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Aluminum oxide (Al2O3)-and titanium dioxide (TiO2)-supported iridium-ruthenium (IrRu) catalysts were syn-thesized and the effect that their metal particle size and metal-support interactions have on their catalytic performance toward carbon monoxide (CO)-assisted nitric oxide (NO) reduction was investigated. A series of spectroscopic analyses revealed that IrRu bimetallic particles were well-alloyed on both the Al2O3 and TiO2 supports, but that the latter exhibited a smaller size due to the strong interactions between the metal and support. Despite the large metal particle size of IrRu/Al2O3, the selective conversion of NOx to N2 assisted by of CO oxidation was more efficient than that of IrRu/TiO2. Mechanistic and microkinetics analyses suggested that the defect-free flat surface structure of the IrRu alloy was beneficial for selective NOx reduction and CO oxidation due to the moderate binding strength of the intermediates of desired reactions. The metal-support interfaces were found to be inactive regardless of their interaction strength. This analysis provides an explanation for the su-perior performance of IrRu/Al2O3 compared to its TiO2-supported counterpart due to its few defects, large metal size, and small proportion of metal-support interfaces.

引用

页数：11