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Kinetic study of catalytic gasification of wood char impregnated withdifferent alkali salts
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.ORCID iD: 0000-0002-8235-9839
Luleå tekniska universitet.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.
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Number of Authors: 6
2016 (English)In: Energy, ISSN 0360-5442, E-ISSN 1873-6785Article in journal (Refereed) In press
Abstract [en]

Different concentrations (0.1 and 1 M K+/Na+) of salt solutions (K2CO3, Na2CO3, NaOH and NaCl) were used to impregnate alkali in sawdust. After devolatilization, char samples were gasified at different temperatures (750–900 °C) under CO2 in a macro-thermogravimetric analyzer for gasification kinetics. Morphologically, three classes of chars could be identified. Chars experiencing the highest catalytic influence were in Class-2 (0.5 M K2CO3 and 1 M NaOH) with a swollen and molten surface. In contrast, Class-1 (wood char like) and Class-3 (with salt deposits) chars showed moderate and low catalytic effect on gasification reactivity respectively. It is believed to be related to char surface swelling and alkali salt used. At 850 °C or below, the reactivity increased linearly (Class-1 and Class-3 Char) with initial alkali content up to 2200 mmol alkali/kg of char (except for NaCl). The same reaction rate was maintained until 3600 mmol/kg of char of alkali loading (Class-2) and then decreased. However, no trend was observed at 900 °C due to drastic change in reactivity of the samples, probably due to alkali transformation. Among the salts, K2CO3 (0.5 M) was found to be the most suitable for catalytic gasification due to its high catalytic activity in combination with relatively low carbon leaching.

Place, publisher, year, edition, pages
Elsevier, 2016.
Keyword [en]
Gasification, Catalytic, Biomass, Morphology, Kinetics
National Category
Energy Engineering Other Chemical Engineering
Research subject
Energy Engineering; Biochemical Process Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-60324DOI: 10.1016/j.energy.2016.10.134OAI: oai:DiVA.org:ltu-60324DiVA: diva2:1045968
Projects
Catalytic Gasification Project (as part of LTU BioSyngas Program)
Funder
Swedish Energy Agency, 38026-1
Available from: 2016-11-11 Created: 2016-11-11 Last updated: 2016-12-03

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Publisher's full texthttp://www.sciencedirect.com/science/article/pii/S0360544216315808

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