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The ultimate goal of this work is to gain knowledge of the conditions necessary for sufficient removal of tars from gasification gas. A tar-rich gas is produced through pyrolysis at 700ยฐC and alter steam addition, the produced gas is cracked thermally and catalytically between 700 and 900ยฐC using short contact times to allow tar decomposition to be studied. Chromatography is used to analyse the remaining tar. Tars obtained from Miscanthus and straw have been cracked using dolomite and nickel as catalysts. Analyses of tars from Miscanthus and straw are also compared with those of tars from hardwood.
The origin of the tars and their composition are found to be reflected in their origin.
Coprocessing of oil shales and petroleum residues Bibartseva, E. R. et al. Khim. Tekhnol. To@. Masel, 1997, (6). 16-17. (In Russian) Under autoclave conditions of 425ยฐC for 1 h in the presence of 5-15 wt% oil shale, a petroleum vacuum residue is thermally cracked. The presence of the oil shale increases the gasoline and diesel fuel cuts yields to reach a maximum of 8-11 wt%.
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