Activity, selectivity, and stability of vanadium catalysts in formaldehyde production from emissionsof volatile organic compounds

Tiina Laitinen, Satu Ojala, Renaud Cousin, Niina Koivikko, Christophe Poupin, Zouhair El Assal, Atte Aho, Riitta L. Keiski

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)

Abstract

In this study, activity, selectivity and stability of vanadium catalysts supported on zirconia, hafnia, and alumina were examined in the oxidation of methanethiol and methanol to formaldehyde. The 3 wt-% vanadia–alumina catalyst with low VOx surface density showed the highest activity in the formaldehyde production. However, during the stability test, this catalyst deactivated due to the change in the oxidation state of vanadium from V5+ to V4+, decrease the amount of surface vanadium species and the formation of sulphates on the material surface. Zirconia and hafnia supported catalysts with high VOx surface density demonstrated better stability in the reaction conditions, but their activity in the formaldehyde production was lower. One reason for the lower activity might be the formation of metal-mixed oxide phases between vanadia and the support, which could also explain the decreased sulphur deposition on zirconia and hafnia after vanadium impregnation.

Original languageEnglish
Pages (from-to)375–386
JournalJournal of Industrial and Engineering Chemistry
Volume83
DOIs
Publication statusPublished - 25 Mar 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • Chemical Engineering

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