Sorbent enhanced steam reforming (SESR) of methane using dolomite as internal carbon dioxide absorbent: Limitations due to Ca(OH)2 formation

Autor:	Nicolas Hildenbrand, Ivar M. Dahl, Jennifer E. Readman, Richard Blom
Rok vydání:	2006
Předmět:	Sorbent Process Chemistry and Technology Induction period Inorganic chemistry Catalysis Methane law.invention Steam reforming chemistry.chemical_compound chemistry law Fluidized bed Calcination Hydrogen production
Zdroj:	Applied Catalysis A: General. 303:131-137
ISSN:	0926-860X
Popis:	High hydrogen yields can be obtained by sorbent enhanced steam reforming (SESR) of methane at temperatures below 600 °C by using calcined dolomite as internal sorbent together with a Ni/NiAl 2 O 4 catalyst in a fluidized bed reactor. Effluent gas compositions containing >90 mole.% H 2 are obtained, indicating that the sorbent acts efficiently after an induction period with low methane conversion. XRD examination of the catalyst/sorbent powder after different times-on-stream shows that during the induction period, CaO of the calcined dolomite reacts with water vapor to form Ca(OH) 2 . The induction period is directly proportional to the time the catalyst/sorbent mixture is in contact with steam at temperatures below 600 °C where Ca(OH) 2 is thermodynamically stable. The catalyst/sorbent mixture can be regenerated at temperatures above 800 °C in H 2 /N 2 /H 2 O atmosphere.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::bbc8027e5c2b22650f100263265e6f9d https://doi.org/10.1016/j.apcata.2006.02.015 Zobrazit plný text záznamu Full Text from ScienceDirect