Local Structures and Catalytic Ammonia Combustion Properties of Copper Oxides and Silver Supported on Aluminum Oxides

被引：25

作者：

Hinokuma, Satoshi ^{[1
,2
]}

Kawabata, Yusuke ^{[1
]}

Matsuki, Shun ^{[1
]}

Shimanoe, Hiroki ^{[1
]}

Kiritoshi, Saaya ^{[1
]}

Machida, Masato ^{[1
]}

机构：

[1] Kumamoto Univ, Grad Sch Sci & Technol, Dept Appl Chem & Biochem, Chuo Ku, 2-39-1 Kurokami, Kumamoto 8608555, Japan

[2] Japan Sci & Technol Agcy, Precursory Res Embryon Sci & Technol, 4-1-8 Honcho, Kawaguchi, Saitama 3320012, Japan

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2017年 / 121卷 / 08期

关键词：

MIXED-METAL OXIDES; IN-SITU DRIFTS; LOW-TEMPERATURE; SELECTIVE OXIDATION; GASIFIED BIOMASS; NO REDUCTION; FT-IR; NH3; NITROGEN; N-2;

D O I：

10.1021/acs.jpcc.6b13024

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：

The local structures and catalytic NH3 combustion properties of copper oxides (CuOx) and silver (Ag) catalysts supported on aluminum oxides (Al2O3) were studied. In order to achieve high catalytic NH3 combustion activity and high N-2 (low N2O/NO) selectivity, the preparation conditions for impregnated binary catalysts were optimized. In comparison with the single CuOx/Al2O3 and Ag/Al2O3, binary CuOx Ag supported on Al2O3 showed high performance for catalytic NH3 combustion. Among the binary catalysts, sequentially impregnated CuOx/Ag/Al2O3 exhibited the highest activity and N-2 selectivity. Because the combustion activity is closely associated with the Ag Ag coordination number estimated from Ag K-edge XAFS, highly dispersed Ag nanoparticles supported on Al2O3 are considered to play a key role in the low temperature light-off of NH3. CuOx/Ag/Al2O3 also showed higher N-2 (lower NO) selectivity for temperatures at which NH3 conversion reached approximately 100%, indicating that the N-2 is directly produced from the NH3 combustion reaction over CuOx/Ag/Al2O3. Based on several analyses, a reaction mechanism for catalytic NH3 combustion over CuOx/Ag/Al2O3 was finally suggested.

引用

页码：4188 / 4196

页数：9

共 49 条

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