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Preparation and characterization of low-temperature nano-crystalline cubic molybdenum carbides and insights on their structures

Paper ID Volume ID Publish Year Pages File Format Full-Text
41213 45880 2011 9 PDF Available
Title
Preparation and characterization of low-temperature nano-crystalline cubic molybdenum carbides and insights on their structures
Abstract

Direct conversion of precursors formed by drying mixtures of ammonium heptamolybdate (AHM) and sucrose solutions to nano-crystalline cubic molybdenum carbides by temperature-programmed reaction (TPR) with H2 has been studied at low temperature (673 K). The precursors prepared with AHM and sucrose were able to produce nano-crystalline domains of cubic molybdenum carbide which seemed to show carbon vacancies affecting the intensity of the signals (2 0 0) and (2 2 0) of the X-ray powder diffraction patterns. The number of carbon vacancies was affected by the time the precursor spent at 673 K; the longer the time at this temperature, the higher the carbon vacancies observed by reduction of the intensity of the (2 0 0) signal of the X-ray diffraction pattern. The nano-crystalline molybdenum carbides prepared showed activity for the hydrogenation of toluene at 473 K to selectively produce methyl-cyclohexane.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (182 K)Download as PowerPoint slideHighlights► Conversion of ammonium heptamolybdate (AHM) and sucrose to α-Mo2C at 673 K was achieved. ► XRD simulations suggests the formation of carbon vacancies in the prepared α-Mo2C. ► Prepared α-Mo2C is active for the low temperature hydrogenation of toluene.

Keywords
α-Mo2C; Carbon vacancies; Toluene hydrogenation; XRD
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Preparation and characterization of low-temperature nano-crystalline cubic molybdenum carbides and insights on their structures
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 408, Issues 1–2, 28 November 2011, Pages 178–186
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us