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: |
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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: |
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