Characterization of aerogel Ni/Al2O3 catalysts and investigation on their stability for CH4-CO2 reforming in a fluidized bed

Hao, Zhigang; Zhu, Qingshan; Jiang, Zheng; Hou, Baolin; Li, Hongzhong

doi:10.1016/j.fuproc.2008.08.004

Cited by 172 publications

(72 citation statements)

References 40 publications

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“…This is due to the formation of de- [13]. Further, it has been reported that the shift of the main diffraction peak is dependent on the amount of NiO species in the Al 2 O 3 support [19].…”

Section: Crystalline Structure and Phase Of Catalystsmentioning

confidence: 96%

The influence of nickel loading on reducibility of NiO/Al2O3 catalysts synthesized by sol-gel method

Zangouei

Moghaddam

Arasteh

2010

Chem. Eng. Res. Bull.

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Abstract:The sol-gel method was used to synthesize nickel-alumina catalysts with various nickel loadings. Chemical and physical properties of support and supported nickel were characterized by TGA, DTA, EDX, SEM, BET, XRD and TPR techniques. Calcination temperature (500 • C) was determined by performing thermogravimetric analysis (TGA) and differential thermal analysis (DTA) on the samples. Energy dispersive X-ray (EDX) was used to determine the actual content of nickel on alumina. N 2 adsorption test revealed that the specific surface area varied between 550 and 223 m 2 /g for pure alumina and 30%Ni/Al, respectively. X-ray diffraction (XRD) patterns showed no peaks due to NiO species and NiO species were well dispersed on the support by formation of NiAl 2 O 4 phase. Temperature-programmed reduction (TPR) indicated that the nickel species mainly presented in NiAl 2 O 4 phase and small amount of NiO. In the 20 percent nickel loading, the surface NiAl 2 O 4 phase, which is between NiO and bulk NiAl 2 O 4 phases in terms reducibility, was formed considering as a successful result.

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“…This is due to the formation of de- [13]. Further, it has been reported that the shift of the main diffraction peak is dependent on the amount of NiO species in the Al 2 O 3 support [19].…”

Section: Crystalline Structure and Phase Of Catalystsmentioning

confidence: 96%

The influence of nickel loading on reducibility of NiO/Al2O3 catalysts synthesized by sol-gel method

Zangouei

Moghaddam

Arasteh

2010

Chem. Eng. Res. Bull.

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“…Comprehensive investigations, however, have revealed that such carbon deposition was strongly influenced by the precise mode of operation of the chemical conversion process. Importantly, fluidizedbed reforming leads to significant enhancement in the CH 4 conversion process and a considerably reduced carbon deposition when compared with the fixedbed operation process (Wurzel et al 2000;Tomishige 2004;Hao et al 2009). Further optimization of the fluidized-bed configuration has taken the form of innovative approaches using a fluidized bed assisted by an external, axial magnetic field.…”

Section: Synthetic Methanol-a Sustainable Organic Fuel For Transportmentioning

confidence: 99%

Turning carbon dioxide into fuel

Jiang

Xiao

Кузнецов

et al. 2010

Phil. Trans. R. Soc. A.

407

289

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Our present dependence on fossil fuels means that, as our demand for energy inevitably increases, so do emissions of greenhouse gases, most notably carbon dioxide (CO 2 ). To avoid the obvious consequences on climate change, the concentration of such greenhouse gases in the atmosphere must be stabilized. But, as populations grow and economies develop, future demands now ensure that energy will be one of the defining issues of this century. This unique set of (coupled) challenges also means that science and engineering have a unique opportunity-and a burgeoning challenge-to apply their understanding to provide sustainable energy solutions. Integrated carbon capture and subsequent sequestration is generally advanced as the most promising option to tackle greenhouse gases in the short to medium term. Here, we provide a brief overview of an alternative mid-to long-term option, namely, the capture and conversion of CO 2 , to produce sustainable, synthetic hydrocarbon or carbonaceous fuels, most notably for transportation purposes.Basically, the approach centres on the concept of the large-scale re-use of CO 2 released by human activity to produce synthetic fuels, and how this challenging approach could assume an important role in tackling the issue of global CO 2 emissions. We highlight three possible strategies involving CO 2 conversion by physico-chemical approaches: sustainable (or renewable) synthetic methanol, syngas production derived from flue gases from coal-, gas-or oil-fired electric power stations, and photochemical production of synthetic fuels. The use of CO 2 to synthesize commodity chemicals is covered elsewhere (Arakawa et al. 2001 Chem. Rev. 101, 953-996); this review is focused on the possibilities for the conversion of CO 2 to fuels. Although these three prototypical areas differ in their ultimate applications, the underpinning thermodynamic considerations centre on the conversionand hence the utilization-of CO 2 . Here, we hope to illustrate that advances in the science and engineering of materials are critical for these new energy technologies, and specific examples are given for all three examples.With sufficient advances, and institutional and political support, such scientific and technological innovations could help to regulate/stabilize the CO 2 levels in the atmosphere and thereby extend the use of fossil-fuel-derived feedstocks.

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“…The fluidised bed reformer may maximise the benefits of nanoscale catalysts via directly loading the catalysts into the reformer without needs of further manipulation [12,13]. In addition, the fluidised bed reactor is more stable than the fixed bed reformer in operation because the pressure drop is independent of the particle size in fluidised bed reactor [14].…”

Section: Introductionmentioning

confidence: 99%

Comparative study of the dry reforming of methane on fluidised aerogel and xerogel Ni/Al2O3 catalysts

2013

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The xerogel and aerogel Ni(20 wt %)/Al 2 O 3 catalysts were prepared through incipient-wetnessimpregnation and co-precipitation-supercritical drying (CP-SCD), respectively. All the fresh and used catalysts were well characterised using FESEM, BET, XRD, H 2 -TPR and H 2 -TPD techniques. Their properties and catalytic performance in dry reforming of CH 4 in a fluidised bed reactor were comparatively investigated. In comparison with the xerogel catalyst, the aerogel catalyst possessed smaller crystallite size of nickel, larger specific surface area, higher nickel dispersion, lower bulky density and better fluidization quality. More importantly, the aerosol catalyst showed higher catalytic activity, stability and less carbon deposition in dry reforming, due to the excellent physicochemical properties of the aerogel catalyst and its enhanced fluidization quality.

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Characterization of aerogel Ni/Al2O3 catalysts and investigation on their stability for CH4-CO2 reforming in a fluidized bed

Cited by 172 publications

References 40 publications

The influence of nickel loading on reducibility of NiO/Al<sub>2</sub>O<sub>3</sub> catalysts synthesized by sol-gel method

The influence of nickel loading on reducibility of NiO/Al<sub>2</sub>O<sub>3</sub> catalysts synthesized by sol-gel method

Turning carbon dioxide into fuel

Comparative study of the dry reforming of methane on fluidised aerogel and xerogel Ni/Al2O3 catalysts

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