Kinetic investigations of coal gasification for high-purity H2 production with carbon capture and storage potential

Abstract

A novel coal conversion pathway for clean hydrogen production with carbon capture and storage (CCS) is proposed. The alkaline coal gasification for high-purity hydrogen production with CCS is conducted in a designed reactor at moderate conditions (1 atm, 873 K). Hydroxides and a Ni catalyst are used to produce 51.12 mmol H2 with the purity of 99.03% from 1 g of coal. The NaOH can accelerate the coal decomposition and dehydrogenation while both Group I and Group II hydroxides can effectively capture CO2 in situ. The Ni catalyst can greatly promote the methane recombination reaction, water gas shift and macromolecular condensate recombination to generate large amounts of H2. The carbon analysis in the solid and gaseous products shows the carbon capture and storage potential of the alkaline gasification.