Development of a Catalytic Cycle in Molybdenum Carbide Catalyzed NO/CO Reaction

Yao, Zhiwei; Shi, Chuan

doi:10.1007/s10562-009-9875-4

Cited by 10 publications

(3 citation statements)

References 25 publications

(24 reference statements)

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“…In the second step, these oxide precursors were carburized to carbides by a temperature-programmed reduction (TPR) method. 26 The oxide precursor was placed in a micro-reactor and a 40% CH 4 / H 2 (150 mL min À1 ) ow was introduced into the system. The temperature was increased from RT to 300 C over a 30 min period followed by a rise in temperature from 300 to 700 C (for Ni-Mo oxide) or 850 C (for Ni-W oxide) at a 1 C min À1 rate.…”

Section: Catalyst Preparationmentioning

confidence: 99%

Insights into the deactivation mechanism of metal carbide catalysts for dry reforming of methane via comparison of nickel-modified molybdenum and tungsten carbides

et al. 2016

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Section: Catalyst Preparationmentioning

confidence: 99%

Insights into the deactivation mechanism of metal carbide catalysts for dry reforming of methane via comparison of nickel-modified molybdenum and tungsten carbides

et al. 2016

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“…94 Related to this reaction, it has been reported that carbidation of molybdenum surfaces leads to modification of the pathway of formic acid decomposition yielding CO 2 and H 2 . 95 Additional reactions investigated for molybdenum carbide include the hydrogenation of cyclohexane, 96 hydrogenation of carbon monoxide where phase dependent performance is reported, 97 CO/NO reduction 98 and the isomerisation and hydrogenolysis of hydrocarbons. 99 WC has been reported to be an excellent catalyst for the decomposition of NH 3 100 and when mixed with WO 3 to be an effective visible light photocatalyst for isopropanol decomposition, where a promotional effect of WC over WO 3 was reported to be due to enhanced oxygen reduction.…”

Section: Carbides and Nitridesmentioning

confidence: 99%

Alternative catalytic materials: carbides, nitrides, phosphides and amorphous boron alloys

2010

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Catalysts generated by the addition of carbon, nitrogen or phosphorus to transition metals have interesting properties and potential applications. The addition of carbon, nitrogen or phosphorus can lead to substantial modification of the catalytic efficacy of the parent metal and some carbides and nitrides are claimed to be comparable to noble metals in their behaviour. Amorphous boron transition metal alloys are also a class of interesting catalyst, although their structures and phase composition are more difficult to define. In this critical review, the preparation of these catalysts is described and brief details of their application given. To date, attention has largely centred upon the application of these materials as alternatives for existing catalysts. However, novel approaches towards their utilisation can be envisaged. For example, the extent to which it is possible to utilise the "activated" carbon and nitrogen species within the host lattices of carbides and nitrides, respectively, as a reactant remains largely unexplored (195 references).

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“…While conventional FT (Co‐ and Fe‐based) catalysts are generally intolerant of carbon deposition and sulphur‐containing compounds in feed gas, molybdenum carbide catalyst has been receiving significant attention due to its high carbon resistance, sulphur resilience and olefin selectivity since it has been found to possess similar catalytic properties to noble metals . In fact, MoC 1‐x (0≤x<1) catalyst has been employed for different catalytic reactions including NH 3 synthesis, NO reduction, reforming, water‐gas‐shift reaction, hydrotreating and particularly CO hydrogenation …”

Section: Introductionmentioning

confidence: 99%

Evaluation of Ba‐promoted Mo carbide catalyst for Fischer–Tropsch synthesis

Arcotumapathy

Abdullah

et al. 2012

J of Chemical Tech & Biotech

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BACKGROUND Traditional FT catalysts such as Co and Fe still suffer from carbon-induced deactivation even with alkali promotion. The objective of this study was to examine the effect of Ba addition to carbon-tolerant Mo carbide since it has Pt-like characteristics and is cheaper than noble metals as an FT catalyst. RESULTSThe presence of Ba increased the Mo carbide production rate and reduced the activation energy for its formation. The promoted catalyst exhibited higher specific basic site strength and CO 2 uptake for strong basic site than that of the undoped catalyst. Both catalysts exhibited optimal reaction rate at a H 2 mole fraction of 0.75 while CO consumption rate, total olefin-to-paraffin ratio, methane suppression as well as C 5+ selectivity were improved with Ba addition. The non-standard Anderson-Schulz-Flory (ASF) product distribution observed for the Ba-doped catalyst may be due to the appearance of an additional polymerization site on the catalyst surface located in the BaMoO 4 phase. Chain growth factor was enhanced by up to 93% from 0.43 to 0.83 with the Ba-doped catalyst.CONCLUSIONS Ba promoter increased chain growth probability by about 93%. The deviation of product distribution from standard ASF plots with 2 chain growth factors for the 3wt%Ba-10%MoC 1-x /Al 2 O 3 catalyst was probably due to the presence of different active sites for chain initiation. The result is unprecedented and represents excellent opportunity for industrial exploitation of a new and relatively cheap carbon-resistant catalyst.

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Development of a Catalytic Cycle in Molybdenum Carbide Catalyzed NO/CO Reaction

Cited by 10 publications

References 25 publications

Insights into the deactivation mechanism of metal carbide catalysts for dry reforming of methane via comparison of nickel-modified molybdenum and tungsten carbides

Insights into the deactivation mechanism of metal carbide catalysts for dry reforming of methane via comparison of nickel-modified molybdenum and tungsten carbides

Alternative catalytic materials: carbides, nitrides, phosphides and amorphous boron alloys

Evaluation of Ba‐promoted Mo carbide catalyst for Fischer–Tropsch synthesis

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