Stability of supported and promoted-molybdenum carbide catalysts in dry-methane reforming

Darujati, Anna R.S; Thomson, W. W.

doi:10.1016/j.apcata.2005.07.057

Cited by 60 publications

(32 citation statements)

References 33 publications

(58 reference statements)

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“…Systematic studies on Mo 2 C loaded on different supports have been carried out by Brungs et al [7] and Darujati et al [11]. Their results revealed that during a long-term DRM test, when Mo 2 C is supported by ZrO 2 and c-Al 2 O 3 , the catalytic activity and stability were higher than that for materials loaded on other oxide based supports.…”

Section: Introductionmentioning

confidence: 94%

Dry reforming of methane over ZrO2-supported Co–Mo carbide catalyst

Кузнецов

Xiao

et al. 2014

Appl Petrochem Res

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The process of dry reforming of methane has the potential to be an effective route for CO 2 utilization via syn-gas production. In the present study, ZrO 2 -supported Co-Mo bimetallic carbide catalysts were prepared via a coprecipitation method through a combined reduction and carburization procedure employing a CH 4 /H 2 (20/80 %) mixture. All of the as-synthesized materials were tested at 850°, under atmospheric pressure and a CO 2 :CH 4 ratio of 1. The importance of the ZrO 2 support became immediately apparent when it exhibited a higher conversion than the corresponding low-surface-area bulk Mo 2 C catalyst, which we attribute to lewis acid and base active sites on the surface of ZrO 2 . From catalytic tests and pre-and postreaction X-ray diffraction (XRD) patterns, we observed that different dispersions of the monometallic carbides, caused by varying the pre-heating temperatures on ZrO 2 , did not significantly affect conversion or yield. In contrast, incorporation of cobalt atoms into the Mo 2 C lattice significantly enhanced the conversion, yield and stability of the catalysts. Post-reaction XRD patterns indicated that the bimetallic carbide had enhanced the resistance to the oxidation effect that is known to deactivate Mo 2 C catalysts. In addition, increasing the Co loading in the mixed metal carbides was seen to enhance the resistance of the catalyst to the reverse water gas shift reaction, leading to improved stability of the H 2 yields.

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Section: Introductionmentioning

confidence: 94%

Dry reforming of methane over ZrO2-supported Co–Mo carbide catalyst

Кузнецов

Xiao

et al. 2014

Appl Petrochem Res

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“…The active component was chosen because molybdenum carbide was accepted in recent years as a promising catalyst for the conversion of methane and other light hydrocarbons; it possesses high catalytic activity and is resistant to coke formation [8,9].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of membrane catalysts based on Mo2C

2015

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Versions of the synthesis of composite membrane catalysts based on Mo 2 C and ceramic microfil tration membranes by chemical vapor deposition and a sol-gel method were developed. The samples of mas sive and supported membrane catalysts were prepared. Differences in the formation of a catalytic layer and its porous structure depending on the sample preparation method were demonstrated. The catalytic activity of the synthesized samples in the carbon dioxide conversion reaction of methane was studied.

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“…It was found that K significantly decreased surface molybdenum concentrations resulting in reduced activity and rapid deactivation. Zr was found to have no obvious effect on either methane conversion or deactivation rates [8]. Lanthanum-like cerium and their oxides are well known as catalyst additives and their use is well documented.…”

Section: à1 ð2þmentioning

confidence: 99%

“…In particular, monometallic molybdenum carbide, Mo 2 C, has been tested as a catalyst for a number of reactions, including SMR [7], DMR [8,9,21,26], POM [36] and hydrotreating [37]. The use of supported metal carbides was also considered in an attempt to further improve catalytic activity and stability of these materials.…”

Section: à1 ð2þmentioning

confidence: 99%

The effect of lanthanum addition on the catalytic activity of γ-alumina supported bimetallic Co–Mo carbides for dry methane reforming

Almuqati

Кузнецов

et al. 2014

Appl Petrochem Res

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The effect of lanthanum addition to c-alumina supported bimetallic carbides has been studied for the reaction of dry methane reforming using four different lanthanum loading levels of 1, 5, 10 and 15 wt% of lanthanum. It has been demonstrated that the addition of lanthanum to supported bimetallic carbides at low loading levels (1 wt%) results in smaller carbide crystallite sizes compared to catalysts containing either no lanthanum or higher lanthanum loading levels (5-15 wt%). Increased lanthanum loading results in increased carbon dioxide desorption at 500-700°C. Reactions indicated that increased lanthanum loading resulted in significantly reduced product yields due to increased reverse water-gas shift activity. All materials exhibited degrees of sintering during the reaction. It was found that cobalt reacted with lanthanum species to form a LaCoO 3 phase. The 1 wt% catalyst possessed superior catalytic properties for dry methane reforming and was tested for 100 h. After an initial loss of activity, the catalyst appeared to stabilise, however, a decrease of *3 % in the H 2 :CO ratio, evidence of carbide crystallite growth and carbon deposition, indicated that a shift in the side reactions had occurred during the reaction.

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Stability of supported and promoted-molybdenum carbide catalysts in dry-methane reforming

Cited by 60 publications

References 33 publications

Dry reforming of methane over ZrO2-supported Co–Mo carbide catalyst

Dry reforming of methane over ZrO2-supported Co–Mo carbide catalyst

Synthesis of membrane catalysts based on Mo2C

The effect of lanthanum addition on the catalytic activity of γ-alumina supported bimetallic Co–Mo carbides for dry methane reforming

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