Oxidation stability of Mo2C catalysts under fuel reforming conditions

Darujati, Anna R.S; LaMont, David C.; Thomson, W. W.

doi:10.1016/s0926-860x(03)00531-3

Cited by 62 publications

(24 citation statements)

References 17 publications

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“…High yields were observed with an optimized Mo loading of 20 wt % at a reaction temperature of 650 • C. At higher temperatures, Mo 2 C is oxidized to MoO 2 , as reported previously by Darujati et al [76]. MoO 2 , known not to be active in the steam reforming reaction, was identified in the XRD pattern of the spent catalyst at the expense of the Mo 2 C phase.…”

Section: Reforming Reactions: Selective C-c Bond Scissionsupporting

confidence: 81%

Metal Carbides for Biomass Valorization

Chan‐Thaw

Villa

2018

Applied Sciences

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Transition metal carbides have been utilized as an alternative catalyst to expensive noble metals for the conversion of biomass. Tungsten and molybdenum carbides have been shown to be effective catalysts for hydrogenation, hydrodeoxygenation and isomerization reactions. The satisfactory activities of these metal carbides and their low costs, compared with noble metals, make them appealing alternatives and worthy of further investigation. In this review, we succinctly describe common synthesis techniques, including temperature-programmed reaction and carbothermal hydrogen reduction, utilized to prepare metal carbides used for biomass transformation. Attention will be focused, successively, on the application of transition metal carbide catalysts in the transformation of first-generation (oils) and second-generation (lignocellulose) biomass to biofuels and fine chemicals.

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Section: Reforming Reactions: Selective C-c Bond Scissionsupporting

confidence: 81%

Metal Carbides for Biomass Valorization

Chan‐Thaw

Villa

2018

Applied Sciences

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“…It is therefore unlikely that carbon from dissociated CH 4 remains on the surface long enough to react directly with adsorbed oxygen. In spite of the reactivity of CH 4 with the carbide surface, Darujati et al (2003) also showed that CH 4 does not play a role in protecting Mo 2 C against oxidation, whereas CO and H 2 can stabilize the carbide through the highly reversible redox reactions shown here:…”

Section: Discussionmentioning

confidence: 70%

“…The temperature range for this study was 800-900 • C, higher than the temperature of 775 • C used by Darujati et al (2003), to determine the R s sufficient to prevent bulk oxidation. In a prior study, evidence was found that temperatures greater than 775 • C would require higher values of R s to prevent oxidation (LaMont and .…”

Section: Resultsmentioning

confidence: 99%

“…The gases H 2 , CO and to a much lesser extent, CH 4 , contribute to carburization and serve to maintain Mo 2 C as an active catalyst. Darujati et al (2003) first quantified the effect of these gases on Mo 2 C stability, and concluded that bulk oxidation did not occur if a "stability ratio'', R s , defined as R s = P H 2 + P CO P CO 2 + P H 2 O was greater than 0.8. While it is possible to obtain stable reforming with stoichiometric feeds (R s =0) (York et al, 1997;Claridge et al, 1998;LaMont et al, 2003), LaMont and Thomson (2004) have found that this stability was achieved due to operation under mass transfer limited conditions, which allow sufficiently high product gas partial pressures in the catalyst boundary layer to protect Mo 2 C against oxidation.…”

Section: Introductionmentioning

confidence: 99%

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Dry reforming kinetics over a bulk molybdenum carbide catalyst

LaMont

Thomson

2005

Chemical Engineering Science

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“…In searching new catalyst materials Mo 2 C is one of the candidates, which exhibits excellent catalytic behavior in several reaction [1][2][3][4][5]. Recently, it was found that its combination with ZSM-5 zeolite effectively catalyses the aromatization of methane with 80% selectivity at about 10-12% conversion [6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Aromatization of n-hexane on Mo2C catalysts

Solymosi

Barthos

2005

Catal Lett

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The reaction of n-hexane and 1-hexene has been investigated on unsupported and supported Mo 2 C catalysts. Pure Mo 2 C catalyses the dehydrogenation and aromatization of n-hexane at and above 723 K. Benzene was formed with the highest selectivity, $65%, at 773-823 K at a conversion of $25%. Mo 2 C also exhibited high activity towards the reaction of n-hexane when it was deposited in a small amount (2-10%) on SiO 2 . It is assumed that the production of benzene occurs through the formation and subsequent dehydrogenation-cyclization of hexene. Catalysts prepared in situ revealed that the activation and aromatization of hexane and hexene do not require the presence of Mo-O species in the Mo 2 C.

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Oxidation stability of Mo2C catalysts under fuel reforming conditions

Cited by 62 publications

References 17 publications

Metal Carbides for Biomass Valorization

Metal Carbides for Biomass Valorization

Dry reforming kinetics over a bulk molybdenum carbide catalyst

Aromatization of n-hexane on Mo2C catalysts

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