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Catalytic Tar Conversion in Two Different Hot Syngas Cleaning Systems

Straczewski, Grazyna; Mai, Robert; Gerhards, Uta; Garbev, Krassimir; Leibold, Hans

Abstract (englisch):
Tar in the product gas of biomass gasifiers reduces the efficiency of gasification processes
and causes fouling of system components and pipework. Therefore, an efficient tar conversion in
the product gas is a key step of effective and reliable syngas production. One of the most promising
approaches is the catalytic decomposition of the tar species combined with hot syngas cleaning. The
catalyst must be able to convert tar components in the synthesis gas at temperatures of around 700 C
downstream of the gasifier without preheating. A Ni-based doped catalyst with high activity in tar
conversion was developed and characterized in detail. An appropriate composition of transition
metals was applied to minimize catalyst coking. Precious metals (Pt, Pd, Rh, or a combination of two
of them) were added to the catalyst in small quantities. Depending on the hot gas cleaning system
used, both transition metals and precious metals were co-impregnated on pellets or on a ceramic filter
material. In the case of a pelletized-type catalyst, the hot gas cleaning system revealed a conversion
above 80% for 70 and 110 h. The catalyst composed of Ni, Fe, and Cr oxides, promoted with Pt
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Verlagsausgabe §
DOI: 10.5445/IR/1000139963
Veröffentlicht am 12.11.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Technische Chemie (ITC)
Institut für Mikroverfahrenstechnik (IMVT)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 13.10.2021
Sprache Englisch
Identifikator ISSN: 2073-4344
KITopen-ID: 1000139963
HGF-Programm 38.05.01 (POF IV, LK 01) Anthropogenic Carbon Cycle
Erschienen in Catalysts
Verlag MDPI
Band 11
Heft 10
Seiten Article no: 1231
Schlagwörter Ni-based catalyst; noble metal promoters; catalytic ceramic filter; tar conversion; catalyst; long-term activity
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