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The structure and catalytic properties of amorphous phase in MoVTeO catalysts for propane ammoxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
39769 45835 2014 12 PDF Available
Title
The structure and catalytic properties of amorphous phase in MoVTeO catalysts for propane ammoxidation
Abstract

•The amorphous MoVTe phase contains nanosized domain with M1 and M2 structures.•The presence of the M1 phase is confirmed by powder Debye simulation.•Nanostructured MoVTe catalysts are active and selective in propane ammoxidation.•Nanostructured MoVTe M1 phase remains up to 450 °C.

This work presents an investigation of the chemical and phase composition of Mo1.0V0.3Te0.23Ox catalyst prepared by spray drying. The changes in the catalyst after heat treatment at 220–550 °C were characterized by IR and Raman spectroscopy, XRD, HRTEM and differential dissolution methods. In the range of temperature 400–420 °C HRTEM revealed the presence of nanoscaled crystallites that are structurally and chemically related to M1 and M2 phases and randomly distributed in the amorphous matrix. The characteristic diffraction pattern of the amorphous product can be described by a model of nano-sized clusters built from the structure of M1 phase. Nanostructured catalysts are active and selective in propane ammoxidation. The increase of temperature of heat treatment of the catalyst above 450 °C leads to decomposition of nanostructured M1 phase and crystallization of M2 and a series of vanadium–molybdenum phases. The process is accompanied by a decrease in activity.

Graphical abstractThe structure and catalytic properties of amorphous phase in MoVTeO catalysts for propane ammoxidation.Figure optionsDownload full-size imageDownload high-quality image (209 K)Download as PowerPoint slide

Keywords
Propane ammoxidation; MoVTe catalyst; Nanosized clusters; Nanostructure; M1 phase
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The structure and catalytic properties of amorphous phase in MoVTeO catalysts for propane ammoxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 476, 22 April 2014, Pages 91–102
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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