Vanadia–zirconia and vanadia–hafnia catalysts for utilization of volatile organic compound emissions

Satu Ojala, Tiina Laitinen, Sian Leneuf de Neufville, Mari Honkanen, Minnamari Vippola, Mika Huuhtanen, Riitta L. Keiski

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Utilization is a sustainable and interesting alternative for the destructive treatment of volatile organic compounds due to avoided CO2 emission. This work concentrates on the development of active and sulfur-tolerant catalysts for the utilization of contaminated methanol. Impregnated and sol–gel prepared vanadia–zirconia and vanadia–hafnia catalysts were thoroughly characterized by N2 sorption, analytical (S)TEM, elemental analysis, XRD and Raman spectroscopy, and their performances were evaluated in formaldehyde production from methanol and methanethiol mixture. The results showed higher activity of the sol–gel prepared catalysts due to formation of mono-and polymeric vanadia species. Unfortunately, the most active vanadia sites were deactivated more easily than the metal-mixed oxide HfV2 O7 and ZrV2 O7 phases, as well as crystalline V2 O5 observed in the impregnated catalysts. Metal-mixed oxide phases were formed in impregnated catalysts through formation of defects in HfO2 and ZrO2 structure during calcination at 600 C, which was evidenced by Raman spectroscopy. The sol–gel prepared vanadia–zirconia and vanadia–hafnia catalysts were able to produce formaldehyde from contaminated methanol with high selectivity at temperature around 400 C, while impregnated catalysts required 50–100 C higher temperatures.

Original languageEnglish
Article number5265
Number of pages19
JournalMaterials
Volume14
Issue number18
DOIs
Publication statusPublished - Sep 2021
Publication typeA1 Journal article-refereed

Keywords

  • Characterization
  • Environmental catalysis
  • Impregnation
  • Poisoning
  • Sol–gel method
  • Time-gated Raman spectroscopy
  • Utilization of VOC

Publication forum classification

  • Publication forum level 1

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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