Preferential oxidation of CO in H2 rich stream over Au/CeO2–Co3O4 catalysts

Wang, Hui; Zhu, Hua; Qin, Zhangfeng; Wang, Guofu; Liang, Feixue; Wang, Jianguo

doi:10.1016/j.catcom.2007.12.017

Cited by 60 publications

(36 citation statements)

References 24 publications

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“…As compared with cobalt oxide and ceria catalysts, integrating cobalt oxides with ceria can further enhance the redox behavior for CO [10,13,14]. Thus, catalytically active Co and Ce sites in Co 3 O 4 -CeO 2 composite oxides can cooperatively enhance the catalytic activity [15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Flash Synthesis and CO Oxidation of Macro-/Nano-porous Co3O4–CeO2 Via Self-Sustained Decomposition of Metal–Organic Complexes

Deng

Chen

et al. 2015

Catal Lett

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Three-dimensional macro/mesoporous Co 3 O 4 -CeO 2 was prepared via a facile self-sustained decomposition of metal-organic complexes. Porous Co 3 O 4 -CeO 2 was characterized using X-ray diffraction, scanning electron microscopy/-transmission electron microscopy imaging, N 2 adsorption/ desorption and X-ray photoelectron spectroscopy to examine the morphology and microstructure to find out the cause. Co 3 O 4 -CeO 2 with the 3D hierarchical porous structure consisting of nanoparticles is a coral-like shape with a size of tens of micrometers and exhibits the hierarchically porous morphology, in which the walls of the macropores contain smaller mesopores. The catalytic performance of the porous Co 3 O 4 -CeO 2 for CO oxidation has been studied. Among the obtained catalysts, the porous Co 3 O 4 -CeO 2 with 20 wt% Co exhibits the best catalytic activity and the 50 % CO conversion can be reached at 74°C. The presence of transition metal element Co can promote the production of oxygen vacancies and improve oxygen mobility, which result in enhancing the oxygen-storage capacity of porous Co 3 O 4 -CeO 2 and its catalytic performance for CO conversion. Graphical Abstract& Yude Wang

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Section: Introductionmentioning

confidence: 99%

Flash Synthesis and CO Oxidation of Macro-/Nano-porous Co3O4–CeO2 Via Self-Sustained Decomposition of Metal–Organic Complexes

Deng

Chen

et al. 2015

Catal Lett

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“…As can be seen in Figure 4, two zones stand out in the TPR profiles. According to some literature reports13, 17, 18 the zone at low temperature (<270 °C) should be attributed to the reduction of CoOOH and Co 3 O 4 to Co 2+ , whereas the second zone, in the temperature range 270–520 °C, should be ascribed to the reduction of Co 2+ to Co 0 . However, mass balance calculations for the samples for which the composition was known (in terms of CoOOH and Co 3 O 4 content; see Table 1) show that the reduction of the cobalt species to Co 2+ in the first zone is incomplete.…”

Section: Resultsmentioning

confidence: 89%

Highly Active Cobalt Oxide Catalysts Prepared by SACOP for the Preferential Oxidation of CO in Excess Hydrogen

2011

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Cobalt based catalysts synthesized by the silica aquagel confined co‐precipitation (SACOP) method and analyzed at high spatial velocities (≈39 000 h−1) for the preferential oxidation (PROX) of CO in the presence of hydrogen showed the highest values of catalytic activity of all the cobalt‐based catalysts described in the literature, together with good values of selectivity and stability. The Co3O4/CoOOH nanocatalysts had specific surface areas of up to 120 m2 g−1 depending on the type of precipitation used. The SACOP samples precipitated by pouring aquagel into the NaOH solution (method A) gave rise to samples with less CoOOH than if the NaOH solution was poured over the aquagel (method B). This difference is ascribed to the migration of cobalt out of the aquagel microstructure during precipitation by method A. Precipitation by means of method B produced the most active catalyst, owing to the larger amount of amorphous CoOOH in the fresh sample, which was formed by the removal of silica from the cobalt silicate hydroxide. The CoOOH is gradually reduced to high surface area Co3O4 in the presence of H2 during the PROX reaction. The mechanisms of formation of CoOOH and Co3O4 by using SACOP are also discussed.

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“…Nevertheless, the catalytic performance of supported Au catalysts depends on their size and dispersion [40][41][42]. Comparison the catalytic performance when using different supporter (Au/CuO, Au/CeO 2 , Au/(50:50)CuO-CeO 2 catalysts), the Au/(50:50)CuO-CeO 2 catalyst expressed higher methanol conversion with lower CO selectivity than that of Au/CuO and Au/CeO 2 catalysts in a whole range of operating temperature from 200 8C to 300 8C.…”

Section: Supported Au Catalystsmentioning

confidence: 99%

“…Bimetallic Au-Cu/TiO 2 catalysts were found to be more active in the POM reaction than the use of the monometallic Au/TiO 2 and Cu/TiO 2 catalysts, because of metal-metal interaction [39]. Nano-sized gold supported catalysts are extremely interesting due to their high CO reduction activity at low temperatures [40]. Previously the evaluation of the activities of Au catalysts in the CO-PROX reaction revealed that PtAu/CeO 2 and PtAu/CeO 2 ZnO catalysts were active for CO reduction at low temperatures [41,42].…”

Section: Introductionmentioning

confidence: 98%

Hydrogen production via methanol steam reforming over Au/CuO, Au/CeO2, and Au/CuO–CeO2 catalysts prepared by deposition–precipitation

Pongstabodee

Monyanon

Luengnaruemitchai

2012

Journal of Industrial and Engineering Chemistry

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Preferential oxidation of CO in H2 rich stream over Au/CeO2–Co3O4 catalysts

Cited by 60 publications

References 24 publications

Flash Synthesis and CO Oxidation of Macro-/Nano-porous Co3O4–CeO2 Via Self-Sustained Decomposition of Metal–Organic Complexes

Flash Synthesis and CO Oxidation of Macro-/Nano-porous Co3O4–CeO2 Via Self-Sustained Decomposition of Metal–Organic Complexes

Highly Active Cobalt Oxide Catalysts Prepared by SACOP for the Preferential Oxidation of CO in Excess Hydrogen

Hydrogen production via methanol steam reforming over Au/CuO, Au/CeO2, and Au/CuO–CeO2 catalysts prepared by deposition–precipitation

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