| Title: | Vanadia-Zirconia and Vanadia-Hafnia Catalysts for Utilization of Volatile Organic Compound Emissions |
| Author(s): | Ojala S; Laitinen T; Leneuf de Neufville S; Honkanen M; Vippola M; Huuhtanen M; Keiski RL; |
| Address: | "Environmental and Chemical Engineering, Faculty of Technology, University of Oulu, 90570 Oulu, Finland. Institut Universitaire de Technologie de Poitiers, Universite de Poitiers, 86000 Poitiers, France. Tampere Microscopy Center, Tampere University, 33100 Tampere, Finland" |
| ISSN/ISBN: | 1996-1944 (Print) 1996-1944 (Electronic) 1996-1944 (Linking) |
| Abstract: | "Utilization is a sustainable and interesting alternative for the destructive treatment of volatile organic compounds due to avoided CO(2) 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 N(2) 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 HfV(2)O(7) and ZrV(2)O(7) phases, as well as crystalline V(2)O(5) observed in the impregnated catalysts. Metal-mixed oxide phases were formed in impregnated catalysts through formation of defects in HfO(2) and ZrO(2) structure during calcination at 600 degrees 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 degrees C, while impregnated catalysts required 50-100 degrees C higher temperatures" |
| Keywords: | characterization environmental catalysis impregnation poisoning sol-gel method time-gated Raman spectroscopy utilization of VOC; |
| Notes: | "PubMed-not-MEDLINEOjala, Satu Laitinen, Tiina Leneuf de Neufville, Sian Honkanen, Mari Vippola, Minnamari Huuhtanen, Mika Keiski, Riitta L eng Erasmus+/ 289266/Academy of Finland/ Tauno Tonningin Saatio/ The Finnish Foundation for Technology Promotion/ Riitta ja Jorma J. Takasen Saatio Sr/ Switzerland 2021/09/29 Materials (Basel). 2021 Sep 13; 14(18):5265. doi: 10.3390/ma14185265" |
