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Issue 71, 2019, Issue in Progress
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Effect of synthesis pH on the structure and catalytic properties of FeMo catalysts

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Abstract

The effect of pH on polynuclear molybdenum species (isopolymolybdates) synthesis was investigated by Raman spectroscopy. As the pH decreased from 6.0 to 1.0, the main isopolymolybdates changed from MoO42− to Mo7O246− to Mo8O246− to Mo36O1168−. They began to aggregate and their solubility decreased with decreasing pH. The FeMo catalysts comprised particle- and plate-like structures, which were Fe2(MoO4)3 and MoO3, respectively. When a low pH value was used in the catalyst preparation, there was severe aggregation of the particles which have a high Mo/Fe mole ratio and Mo enrichment on the surface layer, which decreased the activity and selectivity of the FeMo catalyst.

Graphical abstract: Effect of synthesis pH on the structure and catalytic properties of FeMo catalysts

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Supplementary files

Article information


Submitted
08 Sep 2019
Accepted
10 Dec 2019
First published
17 Dec 2019

This article is Open Access

RSC Adv., 2019,9, 41720-41728
Article type
Paper

Effect of synthesis pH on the structure and catalytic properties of FeMo catalysts

S. Zhang and M. Han, RSC Adv., 2019, 9, 41720
DOI: 10.1039/C9RA07202K

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    [Original citation] - Published by The Royal Society of Chemistry.

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