Studies of Deactivation of Methanol to Formaldehyde Selective Oxidation Catalyst

Kristian Viegaard Raun, Max Schumann, Martin Høj, Bjarke T. Dalslet, Pablo Beato, Christian Danvad Damsgaard, Jacques Chevallier, Jan-Dierk Grundwaldt, Anker Degn Jensen

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Abstract

Formaldehyde (CH2O) may be synthesized industrially by selective oxidation of methanol over an iron-molybdate (Fe-Mo) oxide catalyst according to: CH3OH + ½O2 →CH2O + H2O. The reaction is normally carried out in a multitubular reactor with excess of air at 250-400 °C (yield = 90-95 %), known as the Formox process [1]. The average lifetime of the industrial catalyst is only 1–2 years depending on the operating conditions. The catalyst consists of a bulk phase of Fe2(MoO4)3 and a surface layer phase of MoO3. The MoO3 surfaceis selective towards formaldehyde while the iron in the sublayer increases the activity of the catalyst [2]. Pure MoO3 in itself has low activity. Literature from the last decades agrees that the major reason for the deactivation is loss of molybdenum from the catalyst. Molybdenum forms volatile species with methanol, which can leave behind Mo poor zones. The catalyst is usually prepared with excess MoO3 (Mo/Fe > 1.5) to counter the loss of Mo. This work focuses on understanding the structural changes occurring in the catalyst and its behavior during deactivation via prolonged activity testing and spectroscopic investigations.
Original languageEnglish
Publication date2017
Number of pages1
Publication statusPublished - 2017
EventNorth American Catalysis Society Meeting 2017 - Denver, United States
Duration: 4 Jun 20179 Jun 2017
Conference number: 25

Conference

ConferenceNorth American Catalysis Society Meeting 2017
Number25
CountryUnited States
CityDenver
Period04/06/201709/06/2017

Cite this

Raun, K. V., Schumann, M., Høj, M., Dalslet, B. T., Beato, P., Damsgaard, C. D., Chevallier, J., Grundwaldt, J-D., & Jensen, A. D. (2017). Studies of Deactivation of Methanol to Formaldehyde Selective Oxidation Catalyst. Abstract from North American Catalysis Society Meeting 2017, Denver, United States.