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5987027 
Journal Article 
Sorbent enhanced steam reforming (SESR) of methane using dolomite as internal carbon dioxide absorbent: Limitations due to Ca(OH)(2) formation 
Hildenbrand, N; Readman, J; Dahl, IM; Blom, R 
2006 
1 
Applied Catalysis A: General
ISSN: 0926-860X
EISSN: 1873-3875 
303 
1 
131-137 
WOS:000236917100018 
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/NiAl2O4 catalyst in a fluidized bed reactor. Effluent gas compositions containing >90mole.% H2 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 H2/N2/H2O atmosphere. 
hydrogen production; natural gas; sorbent enhanced steam reforming; dolomite; nickel catalyst; fluidized bed reactor