Temperature-programmed reduction and temperature-programmed desorption studies of CuO/ZrO2 catalysts

Zhou, Renxian; Yu, Tieming; Jiang, Xiaoyuan; Chen, Fang; Zheng, Xiaoming

doi:10.1016/s0169-4332(98)00369-9

Cited by 160 publications

(51 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Copper oxide has been employed in heterogeneous catalysis for several environmental processes as well as in the production of gas-sensing devices, owing to the conductivity changes induced by the reaction of gases with surface-adsorbed oxygen. The addition of small amounts of additives is known to provide better sensitivity [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Spray-pyrolized nanostructured CuO thin films for H2S gas sensor

2013

View full text Add to dashboard Cite

Nanostructured copper oxide (CuO) thin films were prepared by spray pyrolysis technique. X-ray diffraction was used to investigate the structural properties. Surface morphology was studied using scanning electron microscopy. Microstructure was studied using a transmission electron microscope, and energy-dispersive X-ray analysis was used to determine the elemental composition of prepared nanostructured CuO thin film. Gas-sensing performance was conducted using static gas-sensing system, at different operating temperatures in the range of 200°C to 400°C for the gas concentration of 100 ppm. The maximum sensitivity (S = 872) to H 2 S was found at the temperature of 250°C. Quick response (2 s) and fast recovery (5 s) are the main features of this film.

show abstract

Section: Introductionmentioning

confidence: 99%

Spray-pyrolized nanostructured CuO thin films for H2S gas sensor

2013

View full text Add to dashboard Cite

show abstract

“…The incorporation of Cu ions in the lattice position of Zr ions was reported to be responsible for the catalytic activity in CH 4 and CO oxidation [11]. A facilitated reduction of the Cu species was observed in temperature-programmed reduction with hydrogen or CO, and it was ascribed to a close interaction with ZrO 2 [12,13]. In methanol synthesis and decomposition, Cu and zirconia behaved in a bifunctional manner, with Cu serving as a site for the dissociation or removal of hydrogen molecules, and zirconia as an adsorption site for CO, CO 2 and all other carbon containing intermediates [2,14].…”

Section: Introductionmentioning

confidence: 99%

Cu–ZrO2 Catalysts for Water-gas-shift Reaction at Low Temperatures

Bae

Jung

et al. 2005

Catal Lett

View full text Add to dashboard Cite

A series of Cu-ZrO 2 catalysts with Cu content in the range of 10-70 at.% Cu (=100ÂCu/(Cu+Zr)) were prepared by coprecipitation, and their performances were tested for the water-gas-shift (WGS) reaction. The activity of the catalyst increased with Cu loading and, depending on the loading, the activity was comparable to or better than the activity of a conventional Cu-ZnO-Al 2 O 3 catalyst at low temperatures below 473 K. Characterization of the catalysts revealed that the amount of Cu + present on the catalyst surface, after being reduced by a H 2 mixture at 573 K, was well correlated with the activity of the catalyst, indicating that the Cu + species were the active sites of the WGS reaction. The easy redox between Cu 2+ and Cu + during the WGS reaction was considered to be responsible for the high activity of Cu-ZrO 2 at low temperatures. A reaction mechanism based on the redox was proposed.

show abstract

“…It may note that Cu/ZrO2 combined with calcium oxide in different routes gave the difference in the reduction behaviour. The catalyst prepared at high calcination temperature 650 o C was hardly reduced according to the strong interaction between metal and support formed at the high temperature calcination [21], likewise the reduction peak was unidentified over the copper based catalyst supported by close combination of ZrO2 and calcium oxide which was fired at 300 o C (Cu/ZrO2_CaO300) in Fig. 1(B).…”

Section: Physicochemical Properties Of the Catalystsmentioning

confidence: 97%

The Combination of Calcium Oxide and Cu/ZrO2 Catalyst and their Selective Products for CO2 Hydrogenation

Soisuwan¹,

Wisaijorn²,

Nimnul³

et al. 2016

View full text Add to dashboard Cite

Abstract. The catalytic activities of Cu/ZrO2_CaO catalysts were investigated on CO2 hydrogenation. The CO2 hydrogenations were carried out over combination of calcium oxide and Cu/ZrO2 catalyst. Two calcination temperatures were chosen at 300 and 650 o C according to thermal decomposition results. The catalysts were characterized by means of N2 adsorption-desorption, H2 temperature programmed reduction and X-ray diffraction. The CO2 hydrogenation under atmospheric pressure and at 250 o C was carried out over copper-based catalysts combined with calcium oxide namely i.e. Cu/ZrO 2 _CaO300, Cu/ZrO 2 _CaO650, Cu/ZrO2_Cu/CaO and Cu/ZrO2+CaO. The catalytic activities over all catalysts were consistent for 4 hours. The catalytic reaction rates over copper-based catalysts were in the range of 21.8 -47.4 mol L -1 s -1 g cat -1 . The modification of calcium oxide can improve the catalytic activity of copper-based catalysts to 47.4 mol L -1 s -1 g cat -1 . The calcination temperature can cause a difference in active species that impact on product selectivity. The CaO consisting in copper-based catalysts, i.e. Cu/ZrO 2 _CaO650, facilitate the growth of long chain hydrocarbon, whereas Cu/ZrO 2 _CaO300 favors the formation of carbon monoxide plausibly arising from reverse water gas shift reaction. Directly combined calcium oxide with Cu/ZrO 2 via physically mixing, i.e. Cu/ZrO2+CaO, can impr ove the r ate of methanol production.

show abstract

Temperature-programmed reduction and temperature-programmed desorption studies of CuO/ZrO2 catalysts

Cited by 160 publications

References 20 publications

Spray-pyrolized nanostructured CuO thin films for H2S gas sensor

Spray-pyrolized nanostructured CuO thin films for H2S gas sensor

Cu–ZrO2 Catalysts for Water-gas-shift Reaction at Low Temperatures

The Combination of Calcium Oxide and Cu/ZrO2 Catalyst and their Selective Products for CO2 Hydrogenation

Contact Info

Product

Resources

About