Bed material as a catalyst for char gasification: The case of ash-coated olivine activated by K and S addition
Journal article, 2018

In this paper, the ability of an ash-coated olivine to catalyze the steam gasification of biomass-derived char is investigated in a laboratory reactor. The olivine investigated is a sample from the Chalmers dual fluidized bed gasifier and it has been activated by the in-bed addition of S and K 2 CO 3 . The char and bed material samples were analyzed by Scanning Electron Microscopy coupled with Energy Dispersive X-ray Spectroscopy (SEM-EDS). It is shown that the ash layer coating of the olivine can catalyze the steam gasification of char by transferring catalytic potassium (K) to the char particles. The mobilities of the catalytic species from the olivine ash-layer are discussed. This work furthers the current understanding of the catalytic activities of ash-coated bed material particles during the thermochemical conversion of carbonaceous feedstocks in fluidized beds. In addition, it complements the existing literature on catalytic bed materials, which to date have focused on tar removal and improving gas quality.

Sulfur

Ash-layer

Olivine

Char

Fluidized bed

Potassium

Catalytic gasification

Author

Teresa Berdugo Vilches

Chalmers, Space, Earth and Environment, Energy Technology

Jelena Maric

Chalmers, Space, Earth and Environment, Energy Technology

Pavleta Knutsson

Chalmers, Chemistry and Chemical Engineering, Energy and Material, Environmental Inorganic Chemistry

Daniel C. Rosenfeld

Chalmers, Space, Earth and Environment, Energy Technology

Henrik Thunman

Chalmers, Space, Earth and Environment, Energy Technology

Martin Seemann

Chalmers, Space, Earth and Environment, Energy Technology

Fuel

0016-2361 (ISSN)

Vol. 224 85-93

Subject Categories

Manufacturing, Surface and Joining Technology

Chemical Process Engineering

Bioenergy

DOI

10.1016/j.fuel.2018.03.079