Oxidative CO 2 reforming of methane over stable and active nickel-based catalysts modified with organic agents

Li, Baitao; Qian, Xueyan; Wang, Xiujun

doi:10.1016/j.ijhydene.2015.04.104

Cited by 23 publications

(11 citation statements)

References 64 publications

(51 reference statements)

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“…This clearly shows the effectiveness of using citric acid as a chelating agent in synthesizing highly dispersed nanoparticles and is supported by previous publications. 45,47 During citric acid-assisted impregnation, the negatively charged nickel−citrate complex was added to an acidified silica support. At a solution pH lower than the point of zero charge (PZC) of silica, the surface hydroxyl groups of the silica support are protonated and positively charged and can thus strongly bind the anionic nickel species by electrostatic interaction.…”

Section: Resultsmentioning

confidence: 99%

Highly Dispersed Ni/Silica by Carbonization–Calcination of a Chelated Precursor for Coke-Free Dry Reforming of Methane

Das

Ashok

et al. 2020

ACS Appl. Energy Mater.

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Catalyst deactivation by coke deposition is one of the primary challenges for dry reforming of methane (DRM) to produce syngas. In this study, we report the synthesis of highly dispersed Ni/silica catalysts (∼2.3 nm Ni particles) that exhibit excellent resistance to coke formation and deactivation in DRM by virtue of very small metal particle size, strong metal−support interaction, and sinter resistance, which hinders the formation and growth of filamentous coke. A facile citric acid-chelated nickel impregnation method followed by sequential carbonization/ calcination treatment is developed to synthesize this highly dispersed catalyst. Compared to reference Ni/silica catalysts prepared by the impregnation method, the reported catalyst exhibits 2.5 times specific DRM activity and remarkably high coke resistance with stable performance and negligible coke formation after 100 h on stream. Extensive material characterization using extended X-ray absorption fine structure, high-resolution transmission electron microscopy, Raman, Fourier transform infrared spectroscopy, H 2 temperature-programmed reduction, and mass spectrometry analyses reveals insights into the effect of the synthesis process on the metal dispersion in the catalyst. The reported synthesis method is also observed to increase the density of basic surface sites on the catalyst, which are beneficial for CO 2 activation and coke removal in DRM. The simplicity of the synthesis process and the excellent coke resistance of the resultant catalyst make it promising for large-scale application in DRM and other reforming reactions.

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Section: Resultsmentioning

confidence: 99%

Highly Dispersed Ni/Silica by Carbonization–Calcination of a Chelated Precursor for Coke-Free Dry Reforming of Methane

Das

Ashok

et al. 2020

ACS Appl. Energy Mater.

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“…However, the Ni-Ce-Zr/γ-MA-n (n = 0.5, 1.0, 2.0) presented much larger specific surface areas (~300 m 2 •g -1 ) and pore volumes (~0.27 cm 3 •g -1 ) than the Ni-Ce-Zr/γ-MA-0 sample (172 m 2 •g -1 , 0.16 cm 3 •g -1 ). This result could be attributed to the surface blockage of parts of pores in the γ-MA support resulted from the agglomeration of Ni-Ce-Zr oxides on the surface of the Ni-Ce-Zr/γ-MA-0 sample [29][30][31] .…”

Section: Resultsmentioning

confidence: 99%

Preparation of Highly Dispersed Ni-Ce-Zr Oxides over Mesoporous <i>γ</i>-Alumina and Their Catalytic Properties for CO<sub>2</sub> Methanation

聂望欣¹,

邹秀晶²,

汪学广³

et al. 2016

Acta Physico-Chimica Sinica

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Highly dispersed Ni-Ce-Zr mixed oxides supported on mesoporous γ-alumina (Ni-Ce-Zr/γ-MA) were prepared by a citric acid (CA)-assisted impregnation method and evaluated as catalysts for the methanation of CO2 with H2. The effects of the CA content of the reaction solution on the physicochemical properties and the catalytic performance of the Ni-Ce-Zr/γ-MA catalysts were investigated in detail. The addition of CA promoted the dispersion of the Ni-Ce-Zr oxide species on the γ-alumina surface and improved the interactions between the Ni oxide species and the support, resulting in the formation of homogeneously dispersed Ni nanoparticles in the γ-MA frameworks upon reduction with H2. The resulting Ni-Ce-Zr/γ-MA catalysts were highly active and showed almost 100% selectivity for CH4 during the methanation of CO2 at temperatures in the range of 150-400°C. Notably, the catalytic activity increased as the molar ratio of CA/(Ni + Ce + Zr) increased in the range of 0-2. This effect was most likely caused by the associated decrease in the Ni particle size and the improved electronic and structural properties of the Ni-Ce-ZrOx species. The results of a stability test for the Ni-Ce-Zr/γ-2803

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“…[13][14][15][16][17][18] Conventional preparative methods for these kinds of catalysts typically employ various forms of solution impregnation. [19][20][21][22] When the supported metal catalyst is prepared by impregnation, the precursor to the active metal component is affected by support surface tension, chemistries and solvation effects within the impregnation solution, ease of deposition defined by surface wetting as well as the dynamics of drying. Obviously, there are multiple variables controlling the interactions between the precursor metal salts and the support during and after impregnation that defines the extent of surface coverage, potential for precursor crystallization or aggregation during deposition and activation thereafter.…”

Section: Introductionmentioning

confidence: 99%

“…Conventional preparative methods for these kinds of catalysts typically employ various forms of solution impregnation . When the supported metal catalyst is prepared by impregnation, the precursor to the active metal component is affected by support surface tension, chemistries and solvation effects within the impregnation solution, ease of deposition defined by surface wetting as well as the dynamics of drying.…”

Section: Introductionmentioning

confidence: 99%

Chemical modification in and on single phase [NiO]_0.5[Al₂O₃]_0.5 nanopowders produces “chocolate chip‐like” Ni_x@[NiO]_0.5‐x[Al₂O₃]_0.5 nanocomposite nanopowders

Wang

Sun

et al. 2019

J Am Ceram Soc

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Phase‐pure [NiO]0.5[Al2O3]0.5 spinel nanoparticles (NPs) with limited aggregation were obtained via liquid‐feed flame spray pyrolysis (LF‐FSP) by combusting metalloorganic precursor solutions. Thereafter “chocolate chip‐like” Nix[NiO0.5‐x][Al2O3]0.5 nanoparticles consisting of primary [NiO0.5‐x][Al2O3]0.5 particles with average particle sizes of 40‐60 nm decorated with Ni metal particles (<10 nm in diameter) dispersed on the surface were synthesized by heat treating the spinel NPs at 800°C/7 h in flowing 5% H2:N2 100 mL/min in a fluidized bed reactor. The synthesized materials were characterized using TEM, XRD, FTIR, and TGA/DTA. The Ni depleted areas consist primarily of γ‐Al2O3. The Ni content (800°C) was determined by TGA to be ≈11.3 wt.% based on TGA oxidation behavior. The successful synthesis of such nanocomposites with limited aggregation on a high temperature support provides a facile route to synthesize well‐defined NP catalysts. This work serves as a baseline study for an accompanying paper, wherein thin, flexible, dense films made from these same NPs are used as regenerable catalysts for carbon nanotube syntheses.

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Oxidative CO 2 reforming of methane over stable and active nickel-based catalysts modified with organic agents

Cited by 23 publications

References 64 publications

Highly Dispersed Ni/Silica by Carbonization–Calcination of a Chelated Precursor for Coke-Free Dry Reforming of Methane

Highly Dispersed Ni/Silica by Carbonization–Calcination of a Chelated Precursor for Coke-Free Dry Reforming of Methane

Preparation of Highly Dispersed Ni-Ce-Zr Oxides over Mesoporous <i>γ</i>-Alumina and Their Catalytic Properties for CO<sub>2</sub> Methanation

Chemical modification in and on single phase [NiO]_0.5[Al₂O₃]_0.5 nanopowders produces “chocolate chip‐like” Ni_x@[NiO]_0.5‐x[Al₂O₃]_0.5 nanocomposite nanopowders

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Oxidative CO 2 reforming of methane over stable and active nickel-based catalysts modified with organic agents

Cited by 23 publications

References 64 publications

Highly Dispersed Ni/Silica by Carbonization–Calcination of a Chelated Precursor for Coke-Free Dry Reforming of Methane

Highly Dispersed Ni/Silica by Carbonization–Calcination of a Chelated Precursor for Coke-Free Dry Reforming of Methane

Preparation of Highly Dispersed Ni-Ce-Zr Oxides over Mesoporous <i>γ</i>-Alumina and Their Catalytic Properties for CO<sub>2</sub> Methanation

Chemical modification in and on single phase [NiO]0.5[Al2O3]0.5 nanopowders produces “chocolate chip‐like” Nix@[NiO]0.5‐x[Al2O3]0.5 nanocomposite nanopowders

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Chemical modification in and on single phase [NiO]_0.5[Al₂O₃]_0.5 nanopowders produces “chocolate chip‐like” Ni_x@[NiO]_0.5‐x[Al₂O₃]_0.5 nanocomposite nanopowders