Synthesis, Characterization, and Thiophene Desulfurization Activity of Unsupported γ-Mo2N Macrocrystalline Catalysts

Markel, Eric J.; Burdick, Susan E.; Leaphart, M.; Roberts, Kenneth L.

doi:10.1006/jcat.1998.2307

Cited by 26 publications

(15 citation statements)

References 26 publications

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“…McKay and co-workers [18] have shown that specific activity (per m 2 ) for ammonia synthesis over b-Mo 2 N was independent of surface area. In contrast, specific activities for thiophene desulfurisation [16] and pyridine hydrodenitrogenation [31] were found to decrease with increasing c-Mo 2 N area (from 4 to 193 m 2 g -1 ).…”

Section: Introductionmentioning

confidence: 77%

“…NH 3 has also been reported [23]. The synthesis of high surface area (up to 225 m 2 g -1 ) Mo 2 N requires a low temperature ramp rate (B1 K min -1 ) [16] and/or high gas space velocity (up to 150,000 h -1 ) [24] to circumvent hydrothermal sintering resulting from water released [22]. b-Mo 2 N typically exhibits low surface areas (2-17 m 2 g -1 ) [8,19,20] whereas higher values are characteristic of c-Mo 2 N (5-225 m 2 g -1 ) [25][26][27].…”

Section: Introductionmentioning

confidence: 97%

“…In the synthesis of nitrides via temperature programmed reduction-nitridation, a number of factors have been proposed to influence the MoN x phase, including the nature of the precursor [14] and preparation conditions [15][16][17], i.e. gas composition/space velocity, heating rate and final temperature.…”

Section: Introductionmentioning

confidence: 99%

“…The use of H 2 ? N 2 mixtures can generate either (tetragonal) b-Mo 2 N [18][19][20] or c-Mo 2 N [16,21,22]. Moreover, the formation of (hexagonal) d-MoN from MoS 2 ?…”

Section: Introductionmentioning

confidence: 99%

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Effect of Crystallographic Phase (β vs. γ) and Surface Area on Gas Phase Nitroarene Hydrogenation Over Mo2N and Au/Mo2N

et al. 2012

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The catalytic action of Mo 2 N and Au/Mo 2 N has been assessed in the selective gas phase hydrogenation of p-chloronitrobenzene (p-CNB) to p-chloroaniline (p-CAN). The nitrides were synthesised via temperature programmed treatment of MoO 3 in H 2 ? N 2 and Au introduced by deposition-precipitation with urea. We have examined the influence of nitride crystallographic phase (tetragonal b-Mo 2 N vs. cubic c-Mo 2 N) and surface area (7-66 m 2 g-1) on the catalytic response. Catalyst activation by temperature programmed reduction has been monitored and the reduced catalysts characterised in terms of BET area/pore volume, H 2 chemisorption/temperature programmed desorption (TPD), powder X-ray diffraction (XRD), elemental analysis, scanning (SEM) and transmission (TEM) electron microscopy and X-ray photoelectron spectroscopy (XPS) measurements. The formation of band c-Mo 2 N was confirmed by XRD and TEM. c-Mo 2 N exhibits a platelet morphology whereas b-Mo 2 N is characterised by an aggregation of small crystallites. Hydrogen chemisorption and TPD analysis have established a greater hydrogen uptake capacity (per unit area) for b-Mo 2 N relative to c-Mo 2 N, which is associated with surface nitrogen deficiency, i.e. higher surface Mo/N for b-Mo 2 N. Incorporation of Au on both nitrides resulted in an increase in surface hydrogen. The Au phase takes the form of nanoscale particles with a mean size of 7 and 4 nm on b-Mo 2 N and c-Mo 2 N, respectively. Both b-Mo 2 N and c-Mo 2 N promoted the exclusive hydrogenation of p-CNB to p-CAN where the b-form delivered a higher specific (per m 2) rate; the specific rate for c-Mo 2 N was independent of surface area. The inclusion of Au on both nitrides served to enhance p-CAN production.

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Section: Introductionmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

“…The use of H 2 ? N 2 mixtures can generate either (tetragonal) b-Mo 2 N [18][19][20] or c-Mo 2 N [16,21,22]. Moreover, the formation of (hexagonal) d-MoN from MoS 2 ?…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Crystallographic Phase (β vs. γ) and Surface Area on Gas Phase Nitroarene Hydrogenation Over Mo2N and Au/Mo2N

et al. 2012

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“…Similarly, high hydrogen pressures may lead to nonselective hydrogenation of all aromatics, thus consuming expensive hydrogen in excess [71][72][73][74][75][76].…”

Section: Reactivity Of Poly Aromatic Sulfur Compoundsmentioning

confidence: 99%

Fuel Formulation Studies

Arnold¹,

Badger²,

Miller³

et al. 2000

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Metal Nitrides

Lee

Hyeon

2002

Encyclopedia of Catalysis

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Transition metal nitrides are characterized by high melting points, hardness, and resistance to corrosion. These physical properties are desired for catalytic materials that require resistance against attrition and sintering under reaction conditions. Since high specific area materials became available with clean surfaces, they have attracted considerable attention as catalysts for many reactions including hydrotreating (hydrodesulfurization, hydrodenitrogenation, and hydrodeoxygenation) hydrogenation, dehydrogenation, and ammonia synthesis. Metal nitrides demonstrate catalytic advantages over their parent metals in activity, selectivity, and resistance to poisoning. They have been found to be good catalysts for a number of reactions typically catalyzed by noble metals of high cost and limited supply. Structure, bonding, synthesis, and surface reactivity of transition metal carbides are discussed.

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Synthesis, Characterization, and Thiophene Desulfurization Activity of Unsupported γ-Mo2N Macrocrystalline Catalysts

Cited by 26 publications

References 26 publications

Effect of Crystallographic Phase (β vs. γ) and Surface Area on Gas Phase Nitroarene Hydrogenation Over Mo2N and Au/Mo2N

Effect of Crystallographic Phase (β vs. γ) and Surface Area on Gas Phase Nitroarene Hydrogenation Over Mo2N and Au/Mo2N

Fuel Formulation Studies

Metal Nitrides

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