Hydrodesulfurization over intrazeolite molybdenum nitride clusters prepared by using hexacarbonyl molybdenum as a precursor

Kadono, Takeshi; Kubota, Takeshi; Okamoto, Yasuaki

doi:10.1016/j.cattod.2003.09.009

Cited by 26 publications

(15 citation statements)

References 31 publications

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“…By comparing the amounts of nitrogen generated from the two samples, the ratio of Mo to N in MoN x /ZSM-5 was found to be close to 2, implying that the composition of the MoN x is similar to Mo 2 N. Based on the results of the extended X-ray absorption fine structure (EXAFS) measurements, Okamoto et al have proposed a structure model of intrazeolite molybdenum nitride clusters in NaY prepared by a mild nitridation process. [26] Similarly, the current MoN x /ZSM-5 catalysts should be understood as molybdenum nitride clusters confined in ZSM-5 channels. Figure 4 d shows the model structure of the catalyst constructed using Gaussian.…”

Section: Raman Spectroscopymentioning

confidence: 99%

Catalytic Ammonia Synthesis over Mo Nitride/ZSM‐5

et al. 2010

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Molybdenum nitride species in HZSM‐5 are prepared by the reaction of ammonia with MoOx, which is pre‐exchanged into the channel of HZSM‐5. Both the processes of solid exchange of molybdenum oxide with the zeolite and the ammonia reaction are monitored by mass spectrometry. The Mo/N ratio of the MoNx species in the Mo nitride/HZSM‐5 is close to 2, as measured by temperature‐programmed oxidation. The MoNx species are more stable than bulk Mo2N against oxidation, due to the interaction between the molybdenum nitride species and the charged zeolite framework. The MoNx species, of which the dispersion is found to be greater than 90 %, are very active in ammonia synthesis and the catalytic activity is much more stable than that of bulk Mo2N. The reaction pressure is much more favorable to ammonia formation on the MoNx/ZSM‐5 catalyst than on bulk Mo2N. The interaction of nitrogen molecules with the inner electric field of the zeolite, at an equivalent pressure, enhances the reaction of ammonia synthesis.

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Section: Raman Spectroscopymentioning

confidence: 99%

Catalytic Ammonia Synthesis over Mo Nitride/ZSM‐5

et al. 2010

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“…These workers used a chemical vapour deposition method to introduce Mo(CO) 6 into the pores of zeolite EMT (a hexagonal polytype of zeolite Y), followed by reaction with ammonia. XPS and temperature programmed reaction (TPR) methods were used to show that some nitride species were formed at temperatures as low as 523 K. The group of Okamoto subsequently used a similar method to prepare molybdenum nitride species in zeolite NaY at 673 K, although their Mo K-edge EXAFS measurements were unable to distinguish between O and N in the first coordination shell of molybdenum [14].…”

Section: Introductionmentioning

confidence: 99%

XPS evidence for molybdenum nitride formation in ZSM-5

2006

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“…[1,2] The mechanical properties of molybdenum nitride thin films have been utilized in tribological coatings, [3][4][5][6][7] and its high conductivity has been used in microelectronics. [8] Hexagonal molybdenum nitride is a superconductor with a critical temperature of 14.8 K. [9] Molybdenum nitride has also been found to be catalytically active in several reactions, of which hydrodesulfurization, [10][11][12] hydrodenitrogenation, [13,14] and ammonia synthesis are examples. [15] Atomic layer deposition (ALD) is a chemical, gas-phase, thin-film deposition method.…”

Section: Introductionmentioning

confidence: 98%

Bis(tert‐butylimido)‐bis(dialkylamido) Complexes of Molybdenum as Atomic Layer Deposition (ALD) Precursors for Molybdenum Nitride: the Effect of the Alkyl Group

Miikkulainen¹,

Suvanto²,

Pakkanen³

2008

Chemical Vapor Deposition

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Bis(tert-butylimido)-bis(diethylamido)molybdenum [(, possible precursors for atomic layer deposition (ALD) of molybdenum nitride, are synthesized and characterized. Calorimetric studies are carried out to examine the thermal stability of the new precursor candidates. For the diethylamido complex, sufficient thermal stability is found, ALD tests are performed, and satisfactory parameters for controlled growth are identified. Films grown from bis(tert-butylimido)-bis(diethylamido)molybdenum and ammonia are amorphous, smooth, and conformal. The di-isopropylamido complex shows thermal instability and a very low synthetic yield, hence it is not tested in ALD. Possible decomposition reactions of the precursors are studied by density functional theory (DFT) calculations. The computational results support the low thermal stability of di-isopropylamido complex found through calorimetric studies.

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Hydrodesulfurization over intrazeolite molybdenum nitride clusters prepared by using hexacarbonyl molybdenum as a precursor

Cited by 26 publications

References 31 publications

Catalytic Ammonia Synthesis over Mo Nitride/ZSM‐5

Catalytic Ammonia Synthesis over Mo Nitride/ZSM‐5

XPS evidence for molybdenum nitride formation in ZSM-5

Bis(tert‐butylimido)‐bis(dialkylamido) Complexes of Molybdenum as Atomic Layer Deposition (ALD) Precursors for Molybdenum Nitride: the Effect of the Alkyl Group

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