Surface active sites on Co3O4 nanobelt and nanocube model catalysts for CO oxidation

Hu, Linhua; Sun, Kang; Peng, Qing; Xu, Bin; Li, Yadong

doi:10.1007/s12274-010-1040-2

Cited by 259 publications

(148 citation statements)

References 20 publications

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“…200 mg samples (40-60 mesh) were loaded and pre-treated with a 1.0 vol.% O 2 /N 2 (50 ml/min) gas mixture at 300°C for 0.5 h. After cooling down to room temperature, the reaction gas of 1.0 vol.% CO/2.5 vol.% O 2 /He (50 ml/min) was introduced. The amounts of CO, CO 2 and O 2 in the inlet and outlet streams were measured by an online gas chromatograph.…”

Section: Catalytic Testmentioning

confidence: 99%

“…Tricobalt tetraoxide (Co 3 O 4 ) shows morphology-dependent catalysis in chemical reactions such as CO oxidation [1][2][3][4][5][6], CH 4 combustion [7], hydrodesulfurization of fuels [8] and selective reduction of NO with NH 3 [9]. In these applications, the reaction rate was intimately associated with the morphology of the oxide particles.…”

Section: Introductionmentioning

confidence: 99%

“…In these applications, the reaction rate was intimately associated with the morphology of the oxide particles. For example, Co 3 O 4 nanorods containing substantial amounts of exposed {110} planes exhibited superior catalytic activity for low-temperature CO oxidation to the spherical particles mainly enclosed by the {111} facets [1].Similarly, Co 3 O 4 nanobelts [2], nanosheets [3], nanowires [4] and nanocubes [5] also showed distinct shape effect in CO oxidation. The activity of Co 3 O 4 for catalyzing CH 4 combustion follows the order: nanosheets N nanobelts N nanocubes [7].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Synthesis of Co3O4 nanotubes and their catalytic applications in CO oxidation

Shen

2013

Catalysis Communications

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Section: Catalytic Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis of Co3O4 nanotubes and their catalytic applications in CO oxidation

Shen

2013

Catalysis Communications

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“…The cleavage of Mn-O bond in α-MnO 2 is easier because β-MnO 2 has a denser structure. We also demonstrated the crystal-facet-dependent activities of the Co 3 O 4 nanocrystals in the different kinds of reactions [75,76]. For methane combustion, the activities were: (112) > (011) > (001).…”

Section: Positional Relationship Between Multiple Active Sitesmentioning

confidence: 83%

The electronic structure and geometric structure of nanoclusters as catalytic active sites

2013

Nanotechnology Reviews

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Abstract:In the past few decades, metal nanoparticles applied in heterogeneous catalysis have attracted extensive attention. The term nanocatalysis is broadly referred to as the unique catalytic effect of this series of materials. Although considerable progress has been made in nanocatalysis, it still remains a great challenge to fully understand the nature of active sites in the nanoscale. Many concepts and models have been put forwarded to describe the properties and performances of nano-and subnanoparticles in catalysis. In this review, we propose our perspective on the active sites of heterogeneous catalysis from the aspects of electronic structure and geometric structure of nanoclusters and consider briefly how these clusters function in catalysis. The challenge in nanocatalysis research methods is also discussed.

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“…Cobalt-based oxides have been studied as more cost-effective materials compared to noble metal based catalysts for different oxidation applications [21][22][23][24]. So far, we have prepared the Co 3 O 4 nano-array-based monolithic catalysts using different cobalt precursors, such as cobalt acetate tetrahydrate (Co(C 2 H 3 O 2 ) 2 ·4H 2 O, noted as CA), cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O, noted as CN) and cobalt chloride hexahydrate (CoCl 2 ·6H 2 O, noted as CC), for low temperature oxidation of NO [16].…”

Section: Morphology and Geometry Adjustmentmentioning

confidence: 99%

Nano-Array Integrated Structured Catalysts: A New Paradigm upon Conventional Wash-Coated Monolithic Catalysts?

Weng

Gao

2017

Catalysts

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Abstract:The monolithic catalyst, namely the structured catalyst, is one of the important categories of catalysts used in various fields, especially in catalytic exhaust after-treatment. Despite its successful application in conventional wash-coated catalysts in both mobile and stationary catalytic converters, washcoat-based technologies are facing multi-fold challenges, including: (1) high Pt-group metals (PGM) material loading being required, driving the market prices; (2) less-than ideal distribution of washcoats in typically square-shaped channels associated with pressure drop sacrifice; and (3) far from clear correlations between macroscopic washcoat structures and their catalytic performance. To tackle these challenges, the well-defined nanostructure array (nano-array)-integrated structured catalysts which we invented and developed recently have been proven to be a promising class of cost-effective and efficient devices that may complement or substitute wash-coated catalysts. This new type of structured catalysts is composed of honeycomb-structured monoliths, whose channel surfaces are grown in situ with a nano-array forest made of traditional binary transition metal oxide support such as Al 2 O 3 , CeO 2 , Co 3 O 4 , MnO 2 , TiO 2 , and ZnO, or newer support materials including perovskite-type ABO 3 structures, for example LaMnO 3 , LaCoO 3 , LaNiO, and LaFeO 3 . The integration strategy parts from the traditional washcoat technique. Instead, an in situ nanomaterial assembly method is utilized, such as a hydro (solva-) thermal synthesis approach, in order to create sound structure robustness, and increase ease and complex-shaped substrate adaptability. Specifically, the critical fabrication procedures for nano-array structured catalysts include deposition of seeding layer, in situ growth of nano-array, and loading of catalytic materials. The generic methodology utilization in both the magnetic stirring batch process and continuous flow reactor synthesis offers the nano-array catalysts with great potential to be scaled up readily and cost-effectively. The tunability of the structure and catalytic performance could be achieved through morphology and geometry adjustment and guest atoms and defect manipulation, as well as composite nano-array catalyst manufacture. Excellent stabilities under various conditions were also present compared to conventional wash-coated catalysts.

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Surface active sites on Co3O4 nanobelt and nanocube model catalysts for CO oxidation

Cited by 259 publications

References 20 publications

Synthesis of Co3O4 nanotubes and their catalytic applications in CO oxidation

Synthesis of Co3O4 nanotubes and their catalytic applications in CO oxidation

The electronic structure and geometric structure of nanoclusters as catalytic active sites

Nano-Array Integrated Structured Catalysts: A New Paradigm upon Conventional Wash-Coated Monolithic Catalysts?

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