Catalysis and In Situ Studies of Rh1/Co3O4 Nanorods in Reduction of NO with H2

Wang, Lei; Zhang, Shiran; Zhu, Yuan; Patlolla, Anitha; Shan, Junjun; Yoshida, Hideto; Takeda, Seiji; Frenkel, Anatoly I.; Tao, Franklin Feng

doi:10.1021/cs300816u

Cited by 155 publications

(114 citation statements)

References 53 publications

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“…To avoid surface charging, we use Au, Ag, or HOPG to load catalysts for AP-XPS studies and control the thickness of catalyst layer on a surface 19,37,38 .…”

Section: Discussionmentioning

confidence: 99%

Understanding complete oxidation of methane on spinel oxides at a molecular level

et al. 2015

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It is crucial to develop a catalyst made of earth-abundant elements highly active for a complete oxidation of methane at a relatively low temperature. NiCo 2 O 4 consisting of earth-abundant elements which can completely oxidize methane in the temperature range of 350-550°C. Being a cost-effective catalyst, NiCo 2 O 4 exhibits activity higher than precious-metal-based catalysts. Here we report that the higher catalytic activity at the relatively low temperature results from the integration of nickel cations, cobalt cations and surface lattice oxygen atoms/oxygen vacancies at the atomic scale. In situ studies of complete oxidation of methane on NiCo 2 O 4 and theoretical simulations show that methane dissociates to methyl on nickel cations and then couple with surface lattice oxygen atoms to form -CH 3 O with a following dehydrogenation to À CH 2 O; a following oxidative dehydrogenation forms CHO; CHO is transformed to product molecules through two different sub-pathways including dehydrogenation of OCHO and CO oxidation.

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“…To avoid surface charging, we use Au, Ag, or HOPG to load catalysts for AP-XPS studies and control the thickness of catalyst layer on a surface 19,37,38 .…”

Section: Discussionmentioning

confidence: 99%

Understanding complete oxidation of methane on spinel oxides at a molecular level

et al. 2015

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“…Co 3 O 4 nanorods were synthesized with a modified wet chemistry method in literature 27 . To synthesize a catalyst of singly dispersed Rh 1 Co 3 sites, Co 3 O 4 nanorods were synthesized with a modified wet chemistry method and a following calcination at high temperature 27,28 . Then, species of rhodium precursor were introduced on the crystallized Co 3 O 4 nanorods through a deposition-precipitation with a mass ratio of Rh to Co 3 O 4 of 0.25 wt%.…”

Section: Methodsmentioning

confidence: 99%

Catalysis on singly dispersed bimetallic sites

et al. 2015

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A catalytic site typically consists of one or more atoms of a catalyst surface that arrange into a configuration offering a specific electronic structure for adsorbing or dissociating reactant molecules. The catalytic activity of adjacent bimetallic sites of metallic nanoparticles has been studied previously. An isolated bimetallic site supported on a non-metallic surface could exhibit a distinctly different catalytic performance owing to the cationic state of the singly dispersed bimetallic site and the minimized choices of binding configurations of a reactant molecule compared with continuously packed bimetallic sites. Here we report that isolated Rh 1 Co 3 bimetallic sites exhibit a distinctly different catalytic performance in reduction of nitric oxide with carbon monoxide at low temperature, resulting from strong adsorption of two nitric oxide molecules and a nitrous oxide intermediate on Rh 1 Co 3 sites and following a low-barrier pathway dissociation to dinitrogen and an oxygen atom. This observation suggests a method to develop catalysts with high selectivity.

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“…[16][17][18][19][20] A suitable substrate not only provides a high surface area to stabilize small nanoparticles (NPs) under long-term catalysis but also renders hybrid junctions with rich redox reactions on the two-phase interface. With the development of synthetic techniques in nanoscience, small noble metal NPs, especially atomically precise nanoclusters/metal oxide hybrid nanostructures, have been successfully fabricated very recently, and these materials exhibit remarkable enhanced catalytic activity and selectivity.…”

Section: Introductionmentioning

confidence: 99%

CeO2-encapsulated noble metal nanocatalysts: enhanced activity and stability for catalytic application

2015

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Encapsulation of small noble metal nanoparticles has received attention owing to the resulting highly increased stability and high catalytic activity and selectivity. Among the types of inert metal oxides, CeO 2 is unique. It is inexpensive and highly stable, and, more importantly, the unique electronic configuration gives it a strong capability to provide active oxygen. The method of fabricating CeO 2 -encapsulated noble metal nanocatalysts is determined by the requirements of the application. In this review, we first describe the various types of encapsulated noble metals and then the current developments of synthesis in detail, including the types of hybrid nanostructures and successful synthetic strategies. The following section, concerning catalytic applications, is divided into three topics: anti-sintering capabilities, catalytic activities and selectivities. We hope that this review of the recent achievements and the proposed strategy for addressing the emerging challenges will inspire further developments in this research area. NPG Asia Materials (2015) 7, e179; doi:10.1038/am.2015.27; published online 8 May 2015 INTRODUCTIONNoble metal catalysts have received much attention in the past decade because of their unique chemical and physical properties, and they have been widely applied in industrial use. [1][2][3][4][5][6][7][8][9][10] With the help of noble metal catalysts, environmental friendly catalysis resulting in the decreased production of pollutants, waste minimization and new synthetic routes that circumvent modern synthetic techniques such as Sonogashira-, Heck-and Miyaura-Suzuki-type reactions can be easily realized. 11-15 However, for most technologically important chemical processes, noble metal catalysts spontaneously aggregate and grow to reduce the surface energy, which limits the catalysts' lifetime and efficiency. The ultra-high prices of noble metals have also seriously limited their further development. Because of the development of modern industry, there remains a critical need for robust, simple and readily controllable routes to fabricate highly active, stable and recyclable nanocatalysts.To maximize the catalytic performance of noble metals and reduce the quantity used, it is necessary to load the active centers on a substrate. [16][17][18][19][20] A suitable substrate not only provides a high surface area to stabilize small nanoparticles (NPs) under long-term catalysis but also renders hybrid junctions with rich redox reactions on the two-phase interface. With the development of synthetic techniques in nanoscience, small noble metal NPs, especially atomically precise nanoclusters/metal oxide hybrid nanostructures, have been successfully fabricated very recently, and these materials exhibit remarkable enhanced catalytic activity and selectivity. [21][22][23] However, this simple loading form cannot meet the growing demand for the stability, because the noble metal catalysts contain numerous exposed surfaces

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Catalysis and In Situ Studies of Rh₁/Co₃O₄ Nanorods in Reduction of NO with H₂

Cited by 155 publications

References 53 publications

Understanding complete oxidation of methane on spinel oxides at a molecular level

Understanding complete oxidation of methane on spinel oxides at a molecular level

Catalysis on singly dispersed bimetallic sites

CeO2-encapsulated noble metal nanocatalysts: enhanced activity and stability for catalytic application

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