Origin of the High Activity and Stability of Co3O4 in Low-temperature CO Oxidation

Wang, Yongzhao; Zhao, Yongxiang; Gao, Chunguang; Liu, Dian‐Sheng

doi:10.1007/s10562-008-9531-4

Cited by 86 publications

(49 citation statements)

References 35 publications

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“…Therefore, the influence of pretreatment temperature on mesoporous Co 3 O 4 is dramatic. In the literature, some researchers found that pure Co 3 O 4 is active for CO oxidation below ambient temperature [13,24], whereas others observed activities only at higher temperatures [36]. Even the recent paper reporting high catalytic activity for mesoporous Co 3 O 4 also described its instability.…”

Section: Catalytic Co Oxidationmentioning

confidence: 99%

“…The pioneering work of Haruta and coworkers demonstrated excellent CO oxidation catalysed by finely dispersed gold nanoparticles [12]. However, because of the high cost of noble metals, cheaper metal oxide catalysts are being actively sought [13][14][15][16][17][18][19][20][21][22][23][24]. Despite the high internal surface area of mesoporous transitional metal oxides, the redox activity of their surfaces and the confinement of reactions close to the surface due to the dimensions of the pores, investigation of ordered mesoporous metal oxides as CO oxidation catalysts has been limited to that of only a few isolated systems, e.g., CuO/meso-CeO 2 [25], Pt/meso-Ce 0.5 Zr 0.5 O 2 [26], and mesoporous Co 3 O 4 [27].…”

Section: Introductionmentioning

confidence: 99%

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Ordered Crystalline Mesoporous Oxides as Catalysts for CO Oxidation

et al. 2009

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Crystalline mesoporous metal oxides have attracted considerable attention recently, but their catalytic applications have rarely been studied. In this work, a series of crystalline three-dimensional mesoporous metal oxides (i.e., CeO ) were prepared using the mesoporous silica KIT-6 as a hard template. These ordered mesoporous metal oxides with highly crystalline walls were characterized by PXRD, TEM, N 2 adsorption and evaluated as CO oxidation catalysts. These mesoporous materials, except for mesoporous Fe 2 O 3 , exhibit much higher catalytic activities than their bulk counterparts. In particular, mesoporous Co 3 O 4 , b-MnO 2 , and NiO show appreciable CO oxidation activity below 0°C, and the catalytic activities of mesoporous b-MnO 2 , and NiO are even higher than those of their nanoparticulate counterparts with large surface areas. b-MnO 2 is particularly interesting because it combines low cost and low toxicity with high activity (T 50 = 39°C).

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Section: Catalytic Co Oxidationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ordered Crystalline Mesoporous Oxides as Catalysts for CO Oxidation

et al. 2009

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“…Cobalt oxide catalysts show high activity for CO-PROX in H 2 -rich gases and for low-temperature CO oxidation [7][8][9][10][11][12][13][14][15]. We found that Co 3 O 4 -CeO 2 and Co 3 O 4 -CeO 2 -MnO x catalysts exhibited good catalytic performance for CO-PROX in H 2 -rich gases and could completely remove CO from H 2 -rich gases at ∼170 • C [8,9].…”

Section: Introductionmentioning

confidence: 77%

Stability of Co–Ce–Mn mixed-oxide catalysts for CO preferential oxidation in H2-rich gases

Guo¹,

Chen²,

Liu³

et al. 2010

Chemical Engineering Journal

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“…Within the first 24 h, the relatively smooth surfaces turned into zigzag periodic and rough nanowires, the pore volume dropped by~46%, and the Brunauer-Emmett-Teller (BET) surface area decreased from 8 m 2 /g to 4 m 2 /g. Compared to the surface area decrease in conventional powder-type catalysts, ZnO, TiO 2 , and Co 3 O 4 nano-array catalysts showed much higher thermal stability [33][34][35].…”

Section: Stability Propertiesmentioning

confidence: 93%

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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Origin of the High Activity and Stability of Co3O4 in Low-temperature CO Oxidation

Cited by 86 publications

References 35 publications

Ordered Crystalline Mesoporous Oxides as Catalysts for CO Oxidation

Ordered Crystalline Mesoporous Oxides as Catalysts for CO Oxidation

Stability of Co–Ce–Mn mixed-oxide catalysts for CO preferential oxidation in H2-rich gases

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

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