Efficient hydrodesulfurization catalysts based on Keggin polyoxometalates

Autor:	Olivia Poole, Abdullah Alotaibi, Ivan V. Kozhevnikov, Elena F. Kozhevnikova, Ali Alsalme, M. Rafiq H. Siddiqui, Hossein Bayahia, Jocelyn North
Rok vydání:	2015
Předmět:	chemistry.chemical_compound Keggin structure chemistry Process Chemistry and Technology Polyoxometalate Inorganic chemistry Thiophene Sulfidation Heterogeneous catalysis Hydrodesulfurization Butene Catalysis
Zdroj:	Applied Catalysis A: General. 508:16-24
ISSN:	0926-860X
Popis:	Bulk and supported hydrodesulfurization catalysts based on Mo and W and containing Co or Ni as promoters and phosphorus as a modifier are prepared through the polyoxometalate route using Keggin type phosphomolybdates and phosphotungstates and tested in the HDS of thiophene at 350–400 °C and 1 bar pressure. The corresponding oxidic pre-catalysts retain intact Keggin structure of the parent polyoxometalates and possess Bronsted and Lewis acidity. In the course of sulfidation, the oxidic pre-catalysts transform into an active sulfidic phase with the loss of Keggin structure and catalyst acidity. Catalyst activity increases in the order of supports: SiO 2 2 2 O 3 . CoMoP/γ-Al 2 O 3 catalyst prepared through the polyoxometalate route shows higher HDS activity and butene selectivity than industrial catalyst of comparable composition. The results indicate that polyoxometalate catalyst preparation route can be considered a performance enhancement methodology for HDS catalysis.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7987639520b8b33e040535d162f9235f https://doi.org/10.1016/j.apcata.2015.10.001 Zobrazit plný text záznamu Full Text from ScienceDirect