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New zeolites in fischer‐tropsch synthesis
Author(s) -
Hammer H.,
Joisten M.,
Lüngen S.,
Winkler D.
Publication year - 1994
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.4440180220
Subject(s) - fischer–tropsch process , chemistry , syngas , catalysis , oxygenate , zeolite , mordenite , chemical engineering , hydrocarbon , olefin fiber , inorganic chemistry , selectivity , organic chemistry , engineering
Liquid fuels as well as liquid chemical feedstock can be produced from abundantly available sources such as coal or natural gas via syngas and subsequent Fischer‐Tropsch synthesis (FTS). Continuing earlier investigations of various authors on zeolites A, X, Y, or ZSM‐5 in FTS, this paper deals with mordenite, erionite, ZSM‐11, ZSM‐12, and zeolites L, omega and beta, combined with Fe (promoted with Cu and K), or Co, by coprecipitation, by impregnation with carbonyls, or by ion exchange. It was the aim of this investigation to measure the effect of these zeolites on the composition of FTS products. Catalyst screening was executed at medium pressure (10 or 15 bar) in fixed bed and in bubble column reactors. It was found that the product spectra in the gaseous phase as well as in the liquid phase can be significantly different from those of classical straight‐chain FTS products, and that they branch into more isomers, olefins and oxygenates, owing to the shape selectivity and acidity of the zeolites. Furthermore, it was found that zeolites with large pores were more resistant to fast blocking by carbon deposition. From the point of view of environmental protection, it should be emphasized that the FTS product is absolute sulphur‐free.