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Use of Nickel Oxide as a Catalyst for Tar Elimination in a Chemical-Looping Reforming Reactor Operated with Biomass Producer Gas

Nicolas Berguerand (Institutionen för energi och miljö, Energiteknik) ; Fredrik Lind (Institutionen för energi och miljö, Energiteknik, Chalmers förgasare) ; Mikael Israelsson (Institutionen för energi och miljö, Energiteknik) ; Martin Seemann (Institutionen för energi och miljö, Energiteknik, Chalmers förgasare) ; Biollaz Serge ; Henrik Thunman (Institutionen för energi och miljö, Energiteknik, Chalmers förgasare)
Industrial & Engineering Chemistry Research (0888-5885). Vol. 51 (2012), 51, p. 16610-16616.
[Artikel, refereegranskad vetenskaplig]

A secondary tar-cleaning process based on Chemical-Looping Reforming (CLR) was investigated for upgrading biomass producer gas, derived from the Chalmers University of Technology 2-4 MW indirect gasifier. The experiments were conducted in a bench-scale CLR reactor using a manufactured nickel oxide (NiO) catalyst. Although Ni is a well-documented and efficient steam-reforming catalyst, it is susceptible to rapid deactivation under tar-rich conditions. The aim of this study was to explore the advantages of CLR as a gas-cleaning application, a process which offers continuous regeneration of the carbon deposits on catalysts. The tar-reforming performance of this Ni material and its influence on the gas composition and in particular its potential to increase the H2/CO ratio, were studied. The system was tested at reforming temperatures that ranged from 700°C to 880°C and at oxygen concentrations of 1.0% and 2.2% in the inlet feed to regenerator section. The results confirm the strong ability of the catalyst to reform tars. Higher process temperatures clearly promoted tar conversion, with 96% overall conversion at 880°C (99% if benzene is excluded), as compared with 45% conversion at 700°C. The hydrogen production was favored when temperature was raised. Though, a maximum ratio H2/CO of 2.2 was observed at 750°C. Finally, no time-on-stream deactivation of the catalyst in the CLR was observed during the test, which lasted almost 7 hours.

Nyckelord: Tars, Catalytic Gas Cleaning, Biomass Gas Upgrading, Chemical-Looping Reforming, Circulating Fluidized Beds, Nickel Oxide Catalyst



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Denna post skapades 2012-12-19. Senast ändrad 2015-12-17.
CPL Pubid: 168226

 

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Institutioner (Chalmers)

Institutionen för energi och miljö, Energiteknik (2005-2017)
Institutionen för energi och miljö, Energiteknik, Chalmers förgasare (2007-2017)

Ämnesområden

Energi
Hållbar utveckling
Kemi
Maskinteknik
Kemiteknik

Chalmers infrastruktur

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Denna publikation ingår i:


Design and Operation of a Chemical-Looping Reformer for Catalytic Upgrading of Biomass-Derived Gas