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Catalytic effects of zinc chloride in the pyrolysis of Spanish high sulphur coals

✍ Scribed by JoséV. Ibarra; Rafael Moliner; JoséM. Palacios

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
680 KB
Volume
70
Category
Article
ISSN
0016-2361

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✦ Synopsis

Study of the catalytic effects of zinc chloride (ZnCl,) in the slow pyrolysis of two Spanish high sulphur coals showed that the behaviour of ZnCl, was modified by the presence of organic sulphur and minerals such as calcite and pyrite in the coals. The desulphurization of chars from impregnated coals was lower due to the formation of ZnS from the H,S evolved during pyrolysis. ZnCl, produced a specific dehydrogenation of coal structure from aliphatic structures. This reaction took place at temperatures below 400-C and produced a loss of tar-forming structures and an increase of cross-linking. This implies a reduction of tar yield for impregnated coals.

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