CO oxidation over CeO2-promoted Cu/γ-Al2O3 catalyst: Effect of preparation method

Shiau, Ching-Yeh; Ma, M.W.; Chuang, Cheng-Min

doi:10.1016/j.apcata.2005.11.018

Cited by 62 publications

(27 citation statements)

References 30 publications

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“…Positive effects of H 2 O were ever claimed for Au/ TiO 2 [2], Au/Fe 2 O 3 [2][3][4], Au/CeO 2 [5], Au/Al 2 O 3 [2,6], Pt/ c-Al 2 O 3 [3,7], Pt/SnO 2 [8], Pt-Mg/Al 2 O 3 [9], Pt-Pd/CeO 2 [10] and Pd/CeO 2 /ZrO 2 [11] catalysts. On the other hand, however, negative effects of H 2 O were reported for Au/TiO 2 [12], Au/TiO 2 -In 2 O 3 [12], Ru/C and Pt/C (porous carbonaceous material) [13], Pd-Fe-O x /NaZSM-5 [14], CuO/CeO 2 [3,15,16] and CeO 2 -promoted Cu/c-Al 2 O 3 catalysts [17].…”

Section: Introductionmentioning

confidence: 97%

Positive Effect of Water Vapor on CO Oxidation at Low Temperature over Pd/CeO2–TiO2 Catalyst

et al. 2008

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CO oxidation at low temperature over Pd/CeO 2 -TiO 2 catalyst was carried out in the feed containing different contents of water vapor (H 2 O). A positive effect of H 2 O was observed on the catalytic performance of Pd/CeO 2 -TiO 2 in CO oxidation at low temperature. The extent of this effect depends on the content of H 2 O in the feed; with a H 2 O content being 2.5 vol%, the catalyst Pd/ CeO 2 -TiO 2 exhibits the highest stability (longest life time for CO oxidation at 80°C). The results of in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and temperature-programmed reaction (TPReaction) reaction illustrated that H 2 O in the feed supplies sufficient OH groups in the presence of O 2 , which can react with adsorbed CO on Pd species to produce CO 2 . Moreover, H 2 O may also enhance the adsorption of CO and suppress the formation of some carbonate species.

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Section: Introductionmentioning

confidence: 97%

Positive Effect of Water Vapor on CO Oxidation at Low Temperature over Pd/CeO2–TiO2 Catalyst

et al. 2008

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“…Recently, more efforts are devoted to elucidating the importance of copper oxide-ceria interaction with respect to their redox properties and catalytic performance for methanol synthesis [19], carbon monoxide oxidation [20,21] and selective catalytic NO reduction [22]. Wang et al [23] also reported that the metallic copper interacted with surface oxygen vacancies on ceria plays a decisive role in the WGS reaction.…”

Section: Introductionmentioning

confidence: 97%

Water–Gas Shift Reaction over CuO/CeO2 Catalysts: Effect of the Thermal Stability and Oxygen Vacancies of CeO2 Supports Previously Prepared by Different Methods

Zhan

Zheng

et al. 2009

Catal Lett

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A series of CuO/CeO 2 catalysts were prepared through a two-step process: (1) CeO 2 supports were firstly prepared by precipitation (P), hydrothermal (HT) and solgel (SG) methods, respectively; and (2) CuO was deposited on the above CeO 2 supports by deposition-precipitation method. The as-synthesized CeO 2 supports and CuO/CeO 2 catalysts were characterized by N 2 -physisorption, XRD, XPS, Raman, and H 2 -TPR. The CuO/CeO 2 catalysts were examined with respect to their catalytic activity for the water-gas shift reaction, and their catalytic activities are ranked as: CuO/CeO 2 -P [ CuO/CeO 2 -HT [ CuO/CeO 2 -SG. The results suggest that the CeO 2 prepared by precipitation (i.e., CeO 2 -P-300) has the best thermal stability and the most amounts of surface oxygen vacancies, which make the corresponding CuO/CeO 2 -P catalyst present the largest pore volume, the smallest crystal size of CuO, the highest microstrain (i.e., the highest surface energy) and the most amounts of active sites (i.e., the moderate copper oxide (crystalline) interacted with surface oxygen vacancies of ceria). Therefore, the catalytic activity of CuO/ CeO 2 catalysts, in nature, depends on the thermal stability and the number of surface oxygen vacancies of the CeO 2 supports previously prepared by different methods.

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“…Ceria performs numerous functions such as promoting CO oxidation, NO x reduction; storing and releasing of oxygen and stabilizing the catalyst against sintering [21]. However, pure cerium oxide is rarely adopted as a catalyst due to its poor catalytic activity [22]. Modification with other transition metal oxides may increase stability at high temperature and improve its activity.…”

Section: Introductionmentioning

confidence: 99%

Abatement of Carbon Monoxide over CeO2–CoO x Catalysts: Effect of Preparation Method

2009

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Four CeO 2 -CoO x catalysts (containing 20% ceria) were prepared by impregnation, precipitation-oxidation, co-precipitation and hydrothermal methods (IMP, PO, CP and HT, respectively). They were characterized by X-ray diffraction, high-resolution transmittance electron microscopy, N 2 adsorption-desorption, X-ray photoelectron spectroscopy, and temperature-programmed reduction. The catalysts catalyzed CO oxidation in a continuous flow micro-reactor. These results demonstrate that the activity of CO oxidation depended on both the surface area of catalyst and dispersion of ceria. The IMP catalyst exhibited substantial dispersion of CeO 2 on the surface of CoO x and therefore the easiest release of oxygen to oxidize CO.

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CO oxidation over CeO2-promoted Cu/γ-Al2O3 catalyst: Effect of preparation method

Cited by 62 publications

References 30 publications

Positive Effect of Water Vapor on CO Oxidation at Low Temperature over Pd/CeO2–TiO2 Catalyst

Positive Effect of Water Vapor on CO Oxidation at Low Temperature over Pd/CeO2–TiO2 Catalyst

Water–Gas Shift Reaction over CuO/CeO2 Catalysts: Effect of the Thermal Stability and Oxygen Vacancies of CeO2 Supports Previously Prepared by Different Methods

Abatement of Carbon Monoxide over CeO2–CoO x Catalysts: Effect of Preparation Method

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