Preparation of ceria–zirconia (Ce0.75Zr0.25O2) powders by microwave–hydrothermal (MH) route

Potdar, H.S.; Deshpande, S. B.; Deshpande, A.S.; Gokhale, Suresh; Date, S. K.; Khollam, Y. B.; Patil, A.J.

doi:10.1016/s0254-0584(01)00485-0

Cited by 56 publications

(23 citation statements)

References 16 publications

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“…It was observed that the surface area of Ce 0.8 Zr 0.2 O 2 was 115 m 2 /g whereas that of CeO 2 was 112 m 2 /g after calcination at 500°C for 6 h. The surface area values are quite comparable with reported data for similar compositions prepared by other chemical routes such as a sol-gel, hydrothermal, microwave hydrothermal, micro-emulsion and high-energy ball milling [51][52][53].…”

Section: Characterization To Optimize Ni-ce-zro 2 Catalystssupporting

confidence: 82%

Structure and Catalytic Properties of Ceria-based Nickel Catalysts for CO2 Reforming of Methane

2007

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Carbon dioxide reforming (CDR) of methane to synthesis gas over supported nickel catalysts has been reviewed. The present review mainly focuses on the advantage of ceria based nickel catalysts for the CDR of methane. Nickel catalysts supported on ceria-zirconia showed the highest activity for CDR than nickel supported on other oxides such as zirconia, ceria and alumina. The addition of zirconia to ceria enhances the catalytic activity as well as the catalyst stability. The catalytic performance also depends on the crystal structure of Ni-Ce-ZrO 2 . For example, nickel catalysts co-precipitated with Ce 0.8 Zr 0.2 O 2 having cubic phase gave synthesis gas with CH 4 conversion more than 97% at 800°C and the activity was maintained for 100 h during the reaction. On the contrary, Ni-Ce-ZrO 2 having tetragonal phase (Ce 0.8 Zr 0.2 O 2 ) or mixed oxide phase (Ce 0.5 Zr 0.5 O 2 ) deactivated during the reaction due to carbon formation. The enhanced catalytic performance of co-precipitated catalyst is attributed to a combination effect of nano-crystalline nature of cubic Ce 0.8 Zr 0.2 O 2 support and the finely dispersed nano size NiO x crystallites, resulting in the intimate contact between Ni and Ce 0.8 Zr 0.2 O 2 particles. The Ni/Ce-ZrO 2 /h-Al 2 O 3 also exhibited high catalytic activity during CDR with a synthesis gas conversion more than 97% at 800°C without significant deactivation for more than 40 h. The high stability of the catalyst is mainly ascribed to the beneficial pre-coating of Ce-ZrO 2 resulting in the existence of stable NiO x species, a strong interaction between Ni and the support, and an abundance of mobile oxygen species in itself. TPR results further confirmed that NiO x formation was more favorable than NiO or NiAl 2 O 4 formation and further results suggested the existence of strong metal-support interaction (SMSI) between Ni and the support. Some of the important factors to optimize the CDR of methane such as reaction temperature, space velocity, feed CO 2 /CH 4 ratio and H 2 O and/or O 2 addition were also examined.

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Section: Characterization To Optimize Ni-ce-zro 2 Catalystssupporting

confidence: 82%

Structure and Catalytic Properties of Ceria-based Nickel Catalysts for CO2 Reforming of Methane

2007

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“…Compared with the conventional solvothermal route, the irradiation under the microwave produces a better crystallinity in a shorter treatment time. This indicates that the introduction of the microwave really can save energy and time with faster kinetics of crystallization [36][37][38]. The particle sizes were calculated from (1 1 1) peaks using Scherrer's formula D = k /ˇcos Â, where D is the average grain size, k a constant equal to 0.89, the wavelength of X-rays andˇis the corrected half-width.…”

Section: Resultsmentioning

confidence: 99%

A facile microwave solvothermal process to synthesize ZnWO4 nanoparticles

et al. 2009

Journal of Alloys and Compounds

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“…$ Ce 3? ) than the tetragonal phase of Ce (1 -x) Zr (x) O 2 [17][18][19]. Therefore, it is necessary to study activity/stability of 1 wt% Pt/Ce 0.8 Zr 0.2 O 2 (cubic phase) and Pt/Ce 0.2 Zr 0.8 O 2 (tetragonal phase) in WGS.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study on Nano-Sized 1 wt% Pt/Ce0.8Zr0.2O2 and 1 wt% Pt/Ce0.2Zr0.8O2 Catalysts for a Single Stage Water Gas Shift Reaction

2012

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A comparative study on nano-sized Pt/Ce 0.8 Zr 0.2 O 2 and Pt/Ce 0.2 Zr 0.8 O 2 catalysts in a single stage water gas shift (WGS) reaction was carried out. These catalysts were prepared by impregnating 1 wt% Pt on nano-sized cubic (Ce 0.8 Zr 0.2 O 2 ) and tetragonal (Ce 0.2 Zr 0.8 O 2 ) supports. Both catalysts have been applied to WGS under identical conditions to understand beneficial effect of cubic/tetragonal phases of Ce (1 -x) Zr (x) O 2 . 1 wt% Pt/Ce 0.8 Zr 0.2 O 2 exhibited higher CO conversion than 1 wt% Pt/Ce 0.2 Zr 0.8 O 2 . In addition, 1 wt% Pt/Ce 0.8 Zr 0.2 O 2 catalyst showed relatively stable activity with time on stream. The high activity/stability of 1 wt% Pt/Ce 0.8 Zr 0.2 O 2 catalyst was correlated to its higher Pt dispersion and easier reducibility. Keywords Pt/Ce 0.8 Zr 0.2 O 2 Á Pt/Ce 0.2 Zr 0.8 O 2 Á Single stage water gas shift (WGS) Á Cubic/tetragonal phase

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Preparation of ceria–zirconia (Ce0.75Zr0.25O2) powders by microwave–hydrothermal (MH) route

Cited by 56 publications

References 16 publications

Structure and Catalytic Properties of Ceria-based Nickel Catalysts for CO2 Reforming of Methane

Structure and Catalytic Properties of Ceria-based Nickel Catalysts for CO2 Reforming of Methane

A facile microwave solvothermal process to synthesize ZnWO4 nanoparticles

Comparative Study on Nano-Sized 1 wt% Pt/Ce0.8Zr0.2O2 and 1 wt% Pt/Ce0.2Zr0.8O2 Catalysts for a Single Stage Water Gas Shift Reaction

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