Investigating the effect of Fe as a poison for catalytic HDO over sulfided NiMo alumina catalysts

Arora, Prakhar,1987Chalmers tekniska högskola,Chalmers University of Technology (författare)

The effect of iron (Fe) as poison present in renewable feeds was studied during hydrodeoxygenation (HDO) overmolybdenum based sulfided catalysts. The study was carried out at 6 MPa and 325 °C in batch reaction conditions. Different concentrations of Fe in the feed were tested over MoS2/Al2O3 and NiMoS/Al2O3. A notable drop in activity for the conversion of oxygenates was observed for both catalyst systems with an increased concentration of Fe in the feed. However, the changes in selectivity of products was opposite for unpromoted and Nipromoted catalysts. In the case of the NiMoS catalyst, at higher Fe concentration, the decarbonated product (C17 hydrocarbons) decreased while the direct hydrodeoxygenation product (C18 hydrocarbons)increased. On the contrary, for the base catalyst (MoS2), there was a decrease in the yield of direct hydrodeoxygenation (C18 hydrocarbons) products and an increase in yield of decarbonated products (C17 hydrocarbons). These sulfided catalysts have different sites for these two different reaction routes and they interacted differently with Fe during the deactivation process. With surface deposition of Fe, the ability of these catalysts to create active sites i.e. via sulfur vacancies deteriorated. TEM-EDX results suggested that the effect of Ni as a promoter for the decarbonation route was nullified and a resultant FeMo phase explains the drop in activity and change in selectivity.

Ojagh, Houman,1976Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)ojagh (författare)
Woo, Jung Won,1980Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)jungwon (författare)
Lind Grennfelt, EvaPreem,Preem AB (författare)
Olsson, Louise,1974Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)louisej (författare)
Creaser, Derek,1966Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)creaser (författare)
Preem ABChalmers tekniska högskola (creator_code:org_t)

Ingår i:Applied Catalysis B: Environmental: Elsevier BV227, s. 240-2510926-33731873-3883

Av författaren/redakt...: Arora, Prakhar, ...; Ojagh, Houman, 1 ...; Woo, Jung Won, 1 ...; Lind Grennfelt, ...; Olsson, Louise, ...; Creaser, Derek, ...

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TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Kemiteknik; och Kemiska processe ...

TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Naturresurstekni ...; och Energisystem

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