Effect of thermal treatments on catalyst reducibility and activity in nickel supported on RHA–Al2O3 systems

Chang, Feg-Wen; Tsay, Ming-Tseh; Kuo, Maw-Suey

doi:10.1016/s0040-6031(01)00771-7

Cited by 24 publications

(14 citation statements)

References 35 publications

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“…68 Amorphous silica is also used as a raw material for preparing a series of silica-alumina composites as supports for nickel-based catalysts (Ni/RHA-Al 2 O 3 ) synthesized via ion exchange method. 70 It should be noted that reduction of NiO from the layered nickel compound is particularly difficult, which is probably due to the presence of alumina trapped in the NiO particles resulting in an increase in activation energy of reduction. 70 Conversion of CO 2 and yield of CH 4 are strongly dependent on the calcination and reduction temperatures of the catalysts.…”

Section: Metal-based Heterogeneous Catalystsmentioning

confidence: 99%

“…70 It should be noted that reduction of NiO from the layered nickel compound is particularly difficult, which is probably due to the presence of alumina trapped in the NiO particles resulting in an increase in activation energy of reduction. 70 Conversion of CO 2 and yield of CH 4 are strongly dependent on the calcination and reduction temperatures of the catalysts. Hydrogenation activity decreases as content of alumina increases, indicating that acidic sites are not uniquely responsible for the reaction.…”

Section: Metal-based Heterogeneous Catalystsmentioning

confidence: 99%

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Recent advances in catalytic hydrogenation of carbon dioxide

et al. 2011

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Owing to the increasing emissions of carbon dioxide (CO 2 ), human life and the ecological environment have been affected by global warming and climate changes. To mitigate the concentration of CO 2 in the atmosphere various strategies have been implemented such as separation, storage, and utilization of CO 2 . Although it has been explored for many years, hydrogenation reaction, an important representative among chemical conversions of CO 2 , offers challenging opportunities for sustainable development in energy and the environment. Indeed, the hydrogenation of CO 2 not only reduces the increasing CO 2 buildup but also produces fuels and chemicals. In this critical review we discuss recent developments in this area, with emphases on catalytic reactivity, reactor innovation, and reaction mechanism. We also provide an overview regarding the challenges and opportunities for future research in the field (319 references).

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Section: Metal-based Heterogeneous Catalystsmentioning

confidence: 99%

Section: Metal-based Heterogeneous Catalystsmentioning

confidence: 99%

Recent advances in catalytic hydrogenation of carbon dioxide

et al. 2011

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show abstract

“…Amorphous silica was also used as a raw material for preparing a series of silica-alumina composites as supports for nickel-based catalysts (Ni/RHA-Al 2 O 3 ) synthesized via ion exchange method [21]. It should be noted that reduction of NiO from thermal decomposition of the layered nickel compound was particularly difficult.…”

Section: Introductionmentioning

confidence: 99%

Methanation of carbon dioxide: an overview

Wang

Gong

2010

Front. Chem. Sci. Eng.

487

184

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Although being very challenging, utilization of carbon dioxide (CO 2 ) originating from production processes and flue gases of CO 2 -intensive sectors has a great environmental and industrial potential due to improving the resource efficiency of industry as well as by contributing to the reduction of CO 2 emissions. As a renewable and environmentally friendly source of carbon, catalytic approaches for CO 2 fixation in the synthesis of chemicals offer the way to mitigate the increasing CO 2 buildup. Among the catalytic reactions, methanation of CO 2 is a particularly promising technique for producing energy carrier or chemical. This article focuses on recent developments in catalytic materials, novel reactors, and reaction mechanism for methanation of CO 2 .

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“…The choice of nickel is mainly due to its availability and reasonable cost compared to noble metals. Some studies found that the hydrogenation performance of Ni-based catalyst depends on various factors, including Ni loading [13,14], support [15,16], promoter [17,18], heating treatment condition [19,20], and preparation method [15,21]. These factors affect the surface Ni state more or less and then affect the hydrogenation performance.…”

Section: -Ethylhexanol Is An Important Industrial Materialsmentioning

confidence: 99%

The difference in hydrogenation performance between Ni-in-Al2O3 and Ni-on-Al2O3 for hydrotreating of crude 2-ethylhexanol

Yang

et al. 2010

Korean J. Chem. Eng.

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Two mesoporous material Ni/γ-Al 2 O 3 catalysts were prepared and characterized by ICP-AES, XRD, and TPR. The differences in reaction activity between Ni-in-Al 2 O 3 and Ni-on-Al 2 O 3 were investigated for hydrotreating of crude 2-ethylhexanol. The results show that the Ni species (Ni-on-Al 2 O 3 ) exhibit excellent hydrogenation activities at a wide range of H 2 pressure and space velocity, while the Ni species (Ni-in-Al 2 O 3 ) exhibit similar activities with those of Ni-on-Al 2 O 3 only at higher H 2 pressure and lower space velocity. Due to the presence of extensively exposed Ni species on the Ni-on-Al 2 O 3 catalyst, its hydrogenation performance was increased significantly because of the low interphase mass transfer resistance.

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Effect of thermal treatments on catalyst reducibility and activity in nickel supported on RHA–Al2O3 systems

Cited by 24 publications

References 35 publications

Recent advances in catalytic hydrogenation of carbon dioxide

Recent advances in catalytic hydrogenation of carbon dioxide

Methanation of carbon dioxide: an overview

The difference in hydrogenation performance between Ni-in-Al2O3 and Ni-on-Al2O3 for hydrotreating of crude 2-ethylhexanol

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