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Reduction of Nitric Oxide with Hydrogen on Catalysts of Singly Dispersed Bimetallic Sites Pt1Com and Pd1Con
Nguyen, Luan1,2; Zhang, Shiran1,2; Wang, Lei3; Li, Yuanyuan4; Yoshida, Hideto5; Patlolla, Anitha4; Takeda, Seiji5; Frenkel, Anatoly I.4; Tao, Franklin (Feng)1,2
2016-02-01
发表期刊ACS CATALYSIS
ISSN2155-5435
卷号6期号:2页码:840-850
摘要

The bimetallic catalyst has been one of the main categories of heterogeneous catalysts for chemical production and energy transformation. Isolation of the continuously packed bimetallic sites of a bimetallic catalyst forms singly dispersed bimetallic sites which have distinctly different chemical environment and electronic state and thus exhibit a different catalytic performance. Two types of catalysts consisting of singly dispersed bimetallic sites Pt1Com or Pd1Con (m and n are the average coordination numbers of Co to a Pt or Pd atom) were prepared through a deposition or impregnation with a following controlled calcination and reduction to form Pt1Com or Pd1Con sites. These bimetallic sites are separately anchored on a nonmetallic support. Each site only consists of a few metal atoms. Single dispersions of these isolated bimetallic sites were identified with scanning transmission electron microscopy. Extended X-ray absorption fine structure spectroscopy (EXAFS) revealed the chemical bonding of single atom Pt-1 (or Pd-1) to Co atoms and thus confirmed the formation of bimetallic sites, Pt1Com and Pd1Con. Reduction of NO with H-2 was used as a probing reaction to test the catalytic performance on this type of catalyst. Selectivity in reducing nitric oxide to N-2 on Pt1Com at 150 degrees C is 98%. Pd1Con is active for reduction of NO with a selectivity of 98% at 250 degrees C. In situ studies of surface chemistry with ambient-pressure X-ray photoelectron spectroscopy and coordination environment of Pt and Pd atoms with EXAFS showed that chemical state and coordination environment of Pt1Com and Pd1Con remain during catalysis up to 250 and 300 degrees C, respectively. The correlation of surface chemistries and structures of these catalysts with their corresponding catalytic activities and selectivities suggests a method to develop new bimetallic catalysts and a new type of single site catalysts.

关键词Single Site Catalysis Bimetallic Ap-xps Exafs In-situ And operAndo
文章类型Article
WOS标题词Science & Technology ; Physical Sciences
DOI10.1021/acscatal.5b00842
收录类别SCI
语种英语
关键词[WOS]Water-gas Shift ; Surface-chemistry ; In-situ ; Electron-microscopy ; Palladium Oxide ; Atom Catalysis ; Oxidation ; Methane ; Xps ; Co
WOS研究方向Chemistry
WOS类目Chemistry, Physical
项目资助者Chemical Catalysis program of U.S. National Science Foundation(NSF-CHE 1462121) ; U.S. Department of Energy(DE-FG02-03ER15476) ; Synchrotron Catalysis Consortium, U.S. Department of Energy(DE-FG02-05ER15688)
WOS记录号WOS:000369774900044
引用统计
被引频次:19[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ipe.ac.cn/handle/122111/20619
专题研究所(批量导入)
通讯作者Tao, Franklin (Feng)
作者单位1.Univ Kansas, Dept Chem & Petr Engn, Lawrence, KS 66045 USA
2.Univ Kansas, Dept Chem, Lawrence, KS 66045 USA
3.Chinese Acad Sci, Inst Proc Engn, Beijing 100190, Peoples R China
4.Yeshiva Univ, Dept Phys, New York, NY 10016 USA
5.Osaka Univ, Inst Sci & Ind Res, Osaka 5670047, Japan
推荐引用方式
GB/T 7714
Nguyen, Luan,Zhang, Shiran,Wang, Lei,et al. Reduction of Nitric Oxide with Hydrogen on Catalysts of Singly Dispersed Bimetallic Sites Pt1Com and Pd1Con[J]. ACS CATALYSIS,2016,6(2):840-850.
APA Nguyen, Luan.,Zhang, Shiran.,Wang, Lei.,Li, Yuanyuan.,Yoshida, Hideto.,...&Tao, Franklin .(2016).Reduction of Nitric Oxide with Hydrogen on Catalysts of Singly Dispersed Bimetallic Sites Pt1Com and Pd1Con.ACS CATALYSIS,6(2),840-850.
MLA Nguyen, Luan,et al."Reduction of Nitric Oxide with Hydrogen on Catalysts of Singly Dispersed Bimetallic Sites Pt1Com and Pd1Con".ACS CATALYSIS 6.2(2016):840-850.
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