| Abstract
| - This study examined the sorption-enhanced production of H2 via the steam−methane reformingprocess using a mixture of Ni-based commercial reforming catalyst and Ca-based sorbent obtainedfrom commercial dolomite. The rates of the reforming, water−gas shift, and CO2 removalreactions are sufficiently fast that combined reaction equilibrium was closely approached,allowing for >95 mol % H2 (dry basis) to be produced in a single step. A dolomite pretreatmentprocedure was developed to remove sulfur, which was necessary to avoid poisoning of thereforming catalyst. The multicycle durability of the catalyst−sorbent mixture was studied as afunction of regeneration temperature and gas composition using a laboratory-scale fixed-bedreactor. Twenty-five-cycle tests showed only moderate activity loss under most of the regenerationconditions studied. The primary loss in activity was associated with the inexpensive sorbentinstead of the more expensive catalyst.
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