Steam reforming of naphthalene on Ni–Cr/Al2O3 catalysts doped with MgO, TiO2, and La2O3

Bangala, Denis N.; Abatzoglou, Nicolas; Chornet, E.

doi:10.1002/aic.690440418

Cited by 124 publications

(54 citation statements)

References 31 publications

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“…19,20 This problem can be overcome by decreasing the acidity of the support material to suppress the adsorption of polyaromatic intermediate compounds, these being precursors for carbon deposits. 24 Another solution would be the use of precious metals that seem to increase the hydrogenation performance and hence to decrease carbon deactivation by intermediately formed carbon.…”

Section: Resultsmentioning

confidence: 99%

Development of a Tar Reforming Catalyst for Integration in a Ceramic Filter Element and Use in Hot Gas Cleaning

Nacken

Engelen

et al. 2007

Ind. Eng. Chem. Res.

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The development of a suitable tar reforming catalyst for integration in a ceramic hot gas filter element is presented. Calcined dolomite, CaO-Al 2 O 3 mixed oxide, and MgO were used as catalyst supports with a grain size fraction between 0.1 and 0.3 mm for Ni doping. The activity of the catalysts with regard to the benzene and naphthalene conversion with and without additional Ru doping was examined. A MgO supported Ni catalyst with a NiO loading of 6% was found to be the most active catalyst in naphthalene reforming in the presence of 100 ppmv H 2 S at 800°C and a filtration velocity of 90 m/h using model biomass gasification gas containing 5 g/N m 3 naphthalene. Complete naphthalene conversion was still achieved after 100 h. After integration of the MgO-Ni catalyst in the ceramic filter element, a differential pressure increase of 6.8 mbar at 25°C was measured, thus indicating the technical relevance of the developed catalyst for use in hot gas cleaning of biomass gasification gas.

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Section: Resultsmentioning

confidence: 99%

Development of a Tar Reforming Catalyst for Integration in a Ceramic Filter Element and Use in Hot Gas Cleaning

Nacken

Engelen

et al. 2007

Ind. Eng. Chem. Res.

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“…The addition of ZrO 2 to reforming catalysts is also claimed in literature [8] as an element able to improve the stability of nickel catalysts in the steam reforming of hydrocarbons. Ceria [9] and lanthana [10] are also found in several formulations of Ni steam reforming catalysts since they are known promoters of carbon removal from metallic surfaces. For aqueous-phase reforming catalysts, there are no studies reporting the effect of the addition of Mg, Zr, Ce and La on the reforming chemistry over nickel catalysts being therefore necessary to be explored.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Production from Glycerol Over Nickel Catalysts Supported on Al2O3 Modified by Mg, Zr, Ce or La

et al. 2008

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Hydrogen production from glycerol reforming in liquid (aqueous phase reforming, APR) and vapor (steam reforming SR) phase over alumina-supported nickel catalysts modified with Ce, Mg, Zr and La was studied. Characterization of catalysts by temperature programmed reduction and XPS analyses revealed important structural effects: (i) the intercalation of Mg between nickel and alumina that inhibited the alumina incorporation to nickel phases, (ii) the close contact between Ni and Zr phases and, (iii) the close surface interaction of La and Ce ions with NiO phases. The catalytic activity of the samples studied in this work clearly indicated the different catalyst functionalities necessary to carry out aqueous-phase and vaporphase steam reforming of glycerol. For aqueous phase reforming of glycerol, the addition of Ce, La and Zr to Ni/ Al 2 O 3 improves the initial glycerol conversions obtained over the Ni/Al 2 O 3 supported catalyst. It is suggested that the differences in catalytic activities are related with geometric effects caused by the decoration of Ni phases by Ce and La or by the close interaction between Ni and Zr. In spite that nickel catalysts showed high APR activities at initial times on stream, all samples showed, independently of support, important deactivation rates that deactivate the catalysts after few hours under operation. Catalysts characterization after APR showed the oxidation of the active metallic Ni during reaction as the main cause of the observed deactivation. In the case of the glycerol steam reforming in vapor phase, the use of Ce, La, Mg and Zr as promoters of Ni based catalysts increases the hydrogen selectivity. Differences in activity were explained in terms of enhancement in: surface nickel concentration (Mg), capacity to activate steam (Zr) and stability of nickel phases under reaction conditions (Ce and La).

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“…Because of the complex composition of real tar, several researchers have studied tar decomposition reactions using biomass tar model compounds such as: anthracene [25], benzene [25][26][27][28][29][30][31], cyclohexane [32], 1-methyl-naphthalene [26,33], naphthalene [25,27,28,[34][35][36][37][38][39][40][41][42][43][44][45], n-heptane [26,[46][47][48], phenol [49], pyrene [25] and toluene [10, 11, 25-28, 31, 50-57].…”

Section: Biomass Tar Model Compoundmentioning

confidence: 99%

Evaluation of different oxygen carriers for biomass tar reforming (I): Carbon deposition in experiments with toluene

Mendiara

Johansen

Utrilla

et al. 2011

Fuel

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Steam reforming of naphthalene on Ni–Cr/Al₂O₃ catalysts doped with MgO, TiO₂, and La₂O₃

Abstract: Magnesium, lanthanum, and titanium oxide-doped nickel -chromium/alumina catalysts were prepared and their performances assessed in the steam reforming of naphthalene ( F I , 023 K; water-to-naphthalene

Cited by 124 publications

References 31 publications

Development of a Tar Reforming Catalyst for Integration in a Ceramic Filter Element and Use in Hot Gas Cleaning

Development of a Tar Reforming Catalyst for Integration in a Ceramic Filter Element and Use in Hot Gas Cleaning

Hydrogen Production from Glycerol Over Nickel Catalysts Supported on Al2O3 Modified by Mg, Zr, Ce or La

Evaluation of different oxygen carriers for biomass tar reforming (I): Carbon deposition in experiments with toluene

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