Assessment of hydrogen production from Sorption Enhanced Chemical Looping Reforming (SE-CLR) of methane

This is the authors' abstract. We don't add key points for this paper.

Sorption Enhanced Chemical Looping Reforming (SE-CLR) is the integration of the sorption enhanced reforming with the autothermal chemical looping reforming (aCLR) to produce a highly concentrated H 2 stream with CO 2 capture. A bifunctional material circulates among three interconnected fluidized bed reactors: air reactor, calciner reactor, and fuel reactor. This material should transfer oxygen for the partial oxidation of the fuel, catalyze the reforming reaction, and absorb CO 2 . In this work, the viability of the SE-CLR of methane was evaluated by mass and enthalpy balances considering the requirements related to the operating conditions and the properties of the bifunctional material. A NiO/CaO mass ratio of 1/1 was identified as the preferred option, and an oxygen-to-fuel ratio, λ, above 1 was needed to operate at autothermal conditions. A highly concentrated H 2 stream of 2.3 kmol H 2 per kmol CH 4 was obtained when operated with a λ of 1.2, which is typically used in aCLR systems. • Evaluation of new process integrating SER with CLR to produce H 2 with CO 2 capture. • A NiO/CaO mass ratio of 1 was identified as the preferred option for SECLR systems. • Oxygen-fuel ratio above 1 is needed to operate at autothermal conditions. • Solids flux leaving the AR and AR temperature are key for the viability of SECLR. • Yield of 2.3 mol H 2 /molCH 4 with oxygen-fuel ratio of 1.2 and NiO/CaO ratio of 1.