Methane partial oxidation over Ni/CeO2–ZrO2 mixed oxide solid solution catalysts

Pengpanich, Sitthiphong; Meeyoo, Vissanu; Rirksomboon, Thirasak

doi:10.1016/j.cattod.2004.06.079

Cited by 108 publications

(69 citation statements)

References 32 publications

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“…The reduction peak with a maximum at 360 °C for Ni catalysts supported on CeO2-ZrO2 corresponds to the reduction of NiO interacting with the support. In the catalyst with higher Ni content (15Ni/CeZr), there is another reduction peak at lower temperature (with a maximum below 300 °C), that can be attributed to the reduction of free NiO species or with weak metal-support interaction [40,41], probably due to the high metal content in the catalyst.…”

Section: Physical Properties (N 2 Adsorption-desorption)mentioning

confidence: 99%

Oxidative Steam Reforming of Raw Bio-Oil over Supported and Bulk Ni Catalysts for Hydrogen Production

et al. 2018

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Several Ni catalysts of supported (on La 2 O 3 -αAl 2 O 3 , CeO 2 , and CeO 2 -ZrO 2 ) or bulk types (Ni-La perovskites and NiAl 2 O 4 spinel) have been tested in the oxidative steam reforming (OSR) of raw bio-oil, and special attention has been paid to the catalysts' regenerability by means of studies on reaction-regeneration cycles. The experimental set-up consists of two units in series, for the separation of pyrolytic lignin in the first step (at 500 • C) and the on line OSR of the remaining oxygenates in a fluidized bed reactor at 700 • C. The spent catalysts have been characterized by N 2 adsorption-desorption, X-ray diffraction and temperature programmed reduction, and temperature programmed oxidation (TPO). The results reveal that among the supported catalysts, the best balance between activity-H 2 selectivity-stability corresponds to Ni/La 2 O 3 -αAl 2 O 3 , due to its smaller Ni 0 particle size. Additionally, it is more selective to H 2 than perovskite catalysts and more stable than both perovskites and the spinel catalyst. However, the activity of the bulk NiAl 2 O 4 spinel catalyst can be completely recovered after regeneration by coke combustion at 850 • C because the spinel structure is completely recovered, which facilitates the dispersion of Ni in the reduction step prior to reaction. Consequently, this catalyst is suitable for the OSR at a higher scale in reaction-regeneration cycles.

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Section: Physical Properties (N 2 Adsorption-desorption)mentioning

confidence: 99%

Oxidative Steam Reforming of Raw Bio-Oil over Supported and Bulk Ni Catalysts for Hydrogen Production

et al. 2018

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“…In contrast, the reduction of supported NiO led to the appearance of several peaks in the H 2 -TPR profile. Usually this is assigned to different forms of metal-support interaction [75,78,79]. It is suggested [80] that higher NiO reduction temperature can be due to the presence of particles with higher dispersion, interacting stronger with the support, while the lower reduction temperature can be related to larger particles with a lower strength of interaction with the support (temperature of reduction closer to the pure NiO sample).…”

Section: Characterization Of the Catalystsmentioning

confidence: 99%

“…The increase of a portion of difficultly reduced Ni 2+ species, as well as the increase of T 1 value corresponding to the weak interaction of Ni 2+ species with support, are found for Ni/SiO 2 /Ce 0.5 Zr 0.5 O 2 -3 catalyst, that are expected to have detrimental effect on its activity in the ATR of CH 4 . It was shown that the increase of both the reducibility of NiO and the Ni o surface dispersion resulted in a rise of CH 4 conversion [79,80,82]. Conversely, it was also concluded that NiO dispersed without strong interaction with the support had a high performance in methane partial oxidation, while in case of NiO dispersed with strong interaction between it and the support the catalyst had a high stability in autothermal reforming in the upper temperature range [83].…”

Section: Catalytic Testsmentioning

confidence: 99%

Application of POSS Nanotechnology for Preparation of Efficient Ni Catalysts for Hydrogen Production

Исмагилов

Матус

Kuznetsov

et al. 2017

Eurasian Chem. Tech. J.

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POSS (polyhedral oligomeric silsesquioxanes) nanotechnology was applied for preparation of efficient Ni catalysts for hydrogen production through autothermal reforming of methane (ATR of CH 4 ). The novel metal-POSS precursor [Nickel (II) -HeptaisobutylPOSS (C 4 H 9 ) 7 Si 7 O 9 (OH)O 2 Ni] of Ni nanoparticles was introduced into Ce 0.5 Zr 0.5 O 2 support with following calcination and reduction stages of activation. The peculiarity of the genesis of Ni/SiO 2 /Ce 0.5 Zr 0.5 O 2 nanomaterials and their characteristics versus deposition mode were studied by X-ray fluorescence spectroscopy, thermal analysis, N 2 adsorption, X-ray diffraction, high-resolution transmission electron microscopy and H 2 temperature-programmed reduction. The two kinds of supported Ni-containing particles were observed: highly dispersed Ni forms (1-2 nm) and large Ni-containing particles (up to 50-100 nm in size). It was demonstrated that the textural, structural, red-ox and, consequently, catalytic properties of ex-Ni-POSS catalysts depend on the deposition mode. The increase of a portion of difficultly reduced Ni 2+ species is found upon application of intermediate calcination during Ni-POSS deposition that has detrimental effect on the activity of catalyst in ATR of CH 4 . The Ni/SiO 2 /Ce 0.5 Zr 0.5 O 2 catalyst prepared by one-step Ni-POSS deposition exhibits the highest H 2 yield -80% at T = 800 °C.

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“…The desorption profiles of the reagent and product molecules arising from the reaction, CH 4 , H 2 , and CO, are plotted in Figure 3 for the two catalysts. Obviously, the Ni/CeO 2 NTA is decomposing methane in quite larger amount when compared to the Ni/CeO 2 mw catalyst.…”

Section: Catalytic Activitymentioning

confidence: 99%

“…In terms of cost and availability, nickel is the metal of choice for such a catalytic reaction. Nevertheless, in order to avoid the drawback of an easy deactivation by carbon and metal sintering, various oxide supports were investigated [3][4][5][6]. When oxidation processes are involved, CeO 2 , in virtue of its peculiar redox properties, is a particularly good catalyst carrier [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Effects of Synthesis on the Structural Properties and Methane Partial Oxidation Activity of Ni/CeO2 Catalyst

2018

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Nickel catalysts supported on homemade CeO 2 oxide were prepared by two procedures intending to achieve different degree of metal-support interaction. One method consisted of a co-precipitation that was assisted by microwave; the other method was based on a modified wetness impregnation in the presence of the organic complexing ligand, nitrilotriacetic acid (NTA). The support and catalysts were characterized by temperature programmed reduction (TPR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) techniques. Significant differences in the structure, in redox properties and in the elemental surface composition emerged. The catalytic behavior in the partial oxidation of methane was tested at atmospheric pressure, in a range of temperature between 400-800 • C, using diluted feed gas mixture with CH 4 /O 2 = 2 and GHSV = 60,000 mL g −1 h −1 . Moreover, the effect of the catalyst reduction pretreatment was investigated. The better catalytic performance of the microwave-assisted sample as compared to the NTA prepared sample was attributed to the stronger interaction of nickel with CeO 2 . Indeed, according to the structural and reducibility results, an adequate electronic contact between the metal and the support favors the formation of oxygen vacancies of ceria and inhibits the sintering of the catalyst active species, with an improvement of the catalytic performance.

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Methane partial oxidation over Ni/CeO2–ZrO2 mixed oxide solid solution catalysts

Cited by 108 publications

References 32 publications

Oxidative Steam Reforming of Raw Bio-Oil over Supported and Bulk Ni Catalysts for Hydrogen Production

Oxidative Steam Reforming of Raw Bio-Oil over Supported and Bulk Ni Catalysts for Hydrogen Production

Application of POSS Nanotechnology for Preparation of Efficient Ni Catalysts for Hydrogen Production

Effects of Synthesis on the Structural Properties and Methane Partial Oxidation Activity of Ni/CeO2 Catalyst

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