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An iron molybdate catalyst for methanol to formaldehyde conversion prepared by a hydrothermal method and its characterization

Paper ID Volume ID Publish Year Pages File Format Full-Text
42319 45920 2009 10 PDF Available
Title
An iron molybdate catalyst for methanol to formaldehyde conversion prepared by a hydrothermal method and its characterization
Abstract

A one-step, low-temperature hydrothermal method has been successfully employed to prepare iron molybdate catalysts with Mo:Fe ratios ranging from 1.5:1 to 3.0:1. The resulting materials were characterized using a number of techniques including: XRD, Raman, N2 adsorption, SEM/EDX, DTA, EDXRD and combined XRD/XAS. The catalytic oxidative dehydrogenation of methanol to formaldehyde has been used as a test reaction. For Mo:Fe ∼ 1.5, phase-pure Fe2(MoO4)3 resulted from syntheses performed at temperatures as low as 100 °C in under 4 h. For samples with a Mo:Fe ∼ 3 detailed analysis of XRD, Raman and EXAFS data revealed the formation of a high surface area possessing, mixed phase material consisting of a poorly crystalline Mo5O14 and an amorphous Fe2(MoO4)3 type precursor. Both phases proved to be thermally unstable above a calcination temperature of 300 °C, going on to form high surface area mixed Fe2(MoO4)3/MoO3. Continued heating of this mixed oxide material resulted in sintering and to a decrease in the surface area. When both mildly (200 °C) and then more severely calcined (300 °C), this mixed phase sample showed a higher selectivity for formaldehyde production than a conventionally prepared (via co-precipitation) iron molybdate catalyst.

Graphical abstractA one-step, low-temperature hydrothermal method has been successfully employed to prepare high surface area iron molybdate catalysts with Mo:Fe ratios of 1.5:1–3:1. Syntheses performed with a Mo:Fe ∼ 3 resulted in a mixed crystalline Mo5O14/amorphous FeMo oxide phase, with the chemical formula which was unstable above a calcination temperature of 300 °C, forming mixed Fe2(MoO4)3/MoO3. The Mo:Fe ∼ 3 phase after both mild (200 °C) and more severe calcinations (300 °C), showed a higher selectivity for formaldehyde production than a conventionally prepared (via co-precipitation) iron molybdate catalyst.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Iron molybdate; Hydrothermal; Methanol-to-formaldehyde
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An iron molybdate catalyst for methanol to formaldehyde conversion prepared by a hydrothermal method and its characterization
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 363, Issues 1–2, 1 July 2009, Pages 143–152
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