Process design simulation of H2 production by sorption enhanced steam methane reforming: evaluation of potential CO2 acceptors†
Abstract
A concept for pure H2 production with CO2 capture by sorption enhanced steam methane reforming (SESMR) has been investigated. Conventional steam reforming with CO2 capture has been used as a base case for comparison. SESMR resulted in competitive thermal efficiencies, which were highly dependent on the CO2 acceptor material. Thus, CaO and other more novel solid acceptors such as Li2ZrO3, K-doped Li2ZrO3, Na2ZrO3 and Li4SiO4 were screened in terms of thermodynamics, kinetics and stability. It was concluded that higher H2 yields and efficiencies can be obtained for the acceptors that have good ability for removing CO2 at low partial pressures. The best efficiencies were obtained using CaO as acceptor due to its more favourable thermodynamics and high reaction rates; however, the stability of CaO has to be improved. On the other hand, Na2ZrO3 is a promising alternative due to the good kinetics for CO2 removal and the stability.
- This article is part of the themed collection: Green chemistry for fuel synthesis and processing