Reduction property and catalytic activity of Ce1−XNiXO2 mixed oxide catalysts for CH4 oxidation

Shan, Wenjuan; Luo, Ming; Ying, Pinliang; Shen, Wenjie; Li, Can

doi:10.1016/s0926-860x(02)00659-2

Cited by 294 publications

(121 citation statements)

References 19 publications

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“…These results confirm that the optimum CeO 2 content is required for the good catalytic performance and high resistance against coke formation in CeO 2 -modified Ni/MgO. It is known that coke formation is favorable at low temperatures [22]. The catalyst promoted with 7 wt % CeO 2 exhibits the highest conversion, while 3 wt % CeO 2 shows the lowest conversion among the promoted catalysts.…”

Section: Resultssupporting

confidence: 69%

Characterization of CeO₂ Promoter of a Nanocrystalline Ni/MgO Catalyst in Dry Reforming of Methane

2014

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Ceria-promoted nickel catalysts supported on nanocrystalline MgO were prepared and employed in methane reforming with CO 2 . Their characterization was accomplished by X-ray diffraction, BET, temperature-programmed oxidation, and temperature-programmed reduction (TPR) techniques. Cerium oxide (CeO 2 ) proved to have a positive effect on catalytic activity, stability, and carbon suppression in methane reforming with CO 2 . A higher CeO 2 content increased the catalyst activity and decreased the amount of deposited carbon over the spent catalysts. The suppression of carbon was related to the high oxygen storage capacity of CeO 2 . In addition, TPR analysis revealed that the CeO 2 promoter reduced the chemical interaction between nickel and support, resulting in an increase in reducibility and higher dispersion of nickel.

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Section: Resultssupporting

confidence: 69%

Characterization of CeO₂ Promoter of a Nanocrystalline Ni/MgO Catalyst in Dry Reforming of Methane

2014

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“…This result might indicate that the reducibility of surface nickel oxide species displayed a decreasing trend during the change of the Ni/Ce ratio range from 0.2-2 and then went up at a Ni/Ce ratio of 5. The T3 reduction peak gradually shifted to higher temperature, probably due to the highly dispersed NiO or Ni-Ce solid solution produced on CeO 2 co-exist as reported by former researchers [35,36]. In terms of amorphous 2NiCe and 3DOM counterpart, the former presented a slightly greater H 2 uptake and lower reduction maximum temperature, implying that the NiCe sample could be easily reduced without 3DOM structure.…”

Section: Temperature-programmed Reductionsupporting

confidence: 57%

Synthesis of Three-Dimensionally Ordered Macroporous NiCe Catalysts for Oxidative Dehydrogenation of Propane to Propene

et al. 2018

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Three-dimensionally ordered macroporous (3DOM) NiCe catalysts with different Ni/Ce molar ratio were fabricated using the colloidal crystal templating method. The physic-chemical properties of the samples were characterized by various techniques, including N 2 adsorption-desorption, X-ray diffraction (XRD), transmission electron microscopy (TEM), Raman, and H 2 -temperature-programmed reduction (TPR) characterizations. The results revealed that the 3DOM NiCe samples preserved the three-dimensionally ordered macroporous channels with interlinked micro-or mesoporous structure and highly dispersed nickel oxide species in the framework upon different amount of nickel incorporation. In the evaluation of the oxidative dehydrogenation (ODH) of propane, the 3DOM NiCe catalysts exhibited higher selectivity and yield to propene than the amorphous NiCe catalyst. An optimum yield of propene of 11.9% with the 30.3% propane conversion at 375 • C was obtained over the 3DOM 2NiCe catalyst. Combining XRD, TPR, and Raman analysis, it could be found that the nickel incorporation in CeO 2 lattice produced a high concentration of oxygen vacancies that were the active sites for the oxidative dehydrogenation of propane. Besides this, the 3DOM structure promoted the rapid diffusion of the reactants and products-favorable for the generation of propene in the ODH of propane.

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“…Thus the weakly adsorbed oxygen species remain in the surface of NiCe-alumina catalysts. This reduction peak have been observed and described previously by other authors [8,[31][32][33]. There was observed slight increase of hydrogen consumption for Ni-Ce-Al-NO 3 catalysts in contrast to Ni-Al-NO 3 material (Table 1).…”

Section: The Role Of Ce Loading On the Ni-ce-al Propertiessupporting

confidence: 88%

The Role of Ni Species Distribution on the Effect of Ce as a Promoter in C2-ODH Reaction

2015

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The aim of work was to analyse and discuss the effect of cerium on the catalytic behaviour of different types of nickel species in the oxidative dehydrogenation of ethane. Ni-Al and Ni-Ce-Al catalysts were prepared from cerium nitrate and nickel nitrate or nickel acetate as a precursor. As-prepared materials were characterized by using of XRD, DR UV-Vis spectroscopy and H 2 -TPR. It was found that the addition of cerium affects both the reducibility of nickel species and the population of nickel species. Firstly, the addition of cerium led to the significant decrease of the reduction peak at 755-785°C to about 40°C due to the Ni-Ce interaction at both Ni-Ce-Al-NO 3 and Ni-Ce-Al-ac catalysts. Secondly, the addition of cerium affected the relative population of nickel species in tetrahedral and octahedral coordination, which population originated from used nickel precursor. The presence of cerium in Ni-Ce-Al-NO 3 catalysts led to the decrease in the relative population of Ni(T d ) species, while the crystal size of NiO in Ni-Ce-Al-ac catalysts decreased with increasing Ce/Ni ratio. The highest ethylene productivity was achieved on catalysts with Ce/Ni molar ratio 0.13. Catalysts exhibited an ethylene productivity up to 1.0 gC 2 =Ág cat -1 Áh -1 with a selectivity of 82 % (Ni-Ce-Al-NO 3 ) and 1.3 gC 2 =Ág cat -1 Áh -1 with a selectivity of 75 % (Ni-CeAl-ac).

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Reduction property and catalytic activity of Ce1−XNiXO2 mixed oxide catalysts for CH4 oxidation

Cited by 294 publications

References 19 publications

Characterization of CeO₂ Promoter of a Nanocrystalline Ni/MgO Catalyst in Dry Reforming of Methane

Characterization of CeO₂ Promoter of a Nanocrystalline Ni/MgO Catalyst in Dry Reforming of Methane

Synthesis of Three-Dimensionally Ordered Macroporous NiCe Catalysts for Oxidative Dehydrogenation of Propane to Propene

The Role of Ni Species Distribution on the Effect of Ce as a Promoter in C2-ODH Reaction

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Reduction property and catalytic activity of Ce1−XNiXO2 mixed oxide catalysts for CH4 oxidation

Cited by 294 publications

References 19 publications

Characterization of CeO2 Promoter of a Nanocrystalline Ni/MgO Catalyst in Dry Reforming of Methane

Characterization of CeO2 Promoter of a Nanocrystalline Ni/MgO Catalyst in Dry Reforming of Methane

Synthesis of Three-Dimensionally Ordered Macroporous NiCe Catalysts for Oxidative Dehydrogenation of Propane to Propene

The Role of Ni Species Distribution on the Effect of Ce as a Promoter in C2-ODH Reaction

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Characterization of CeO₂ Promoter of a Nanocrystalline Ni/MgO Catalyst in Dry Reforming of Methane

Characterization of CeO₂ Promoter of a Nanocrystalline Ni/MgO Catalyst in Dry Reforming of Methane