In-situ CO sub(2 capture in a pilot-scale fluidized-bed membrane reformer for ultra-pure hydrogen production)

• Published in: International journal of hydrogen energy Vol. 36; no. 6; pp. 4038 - 4055
• Main Authors: Andres, Mahecha-Botero, Boyd, Tony, Grace, John R, Lim, CJim, Gulamhusein, Ali, Wan, Brian, Kurokawa, Hideto, Shirasaki, Yoshinori
• Format: Journal Article
• Language: English
• Published: 01.03.2011
• Subjects: Calcium carbonate; Carbon dioxide; Carbonation; Fluidizing; Hydrogen production; Limestone; Membranes; Methane; Palladium
• ISSN: 0360-3199
• DOI: 10.1016/j.ijhydene.2010.09.091

A novel pilot fluidized-bed membrane reformer (FBMR) with permselective palladium membranes was operated with a limestone sorbent to remove CO sub(2 in-situ, thereby shifting the thermodynamic equilibrium to enhance pure hydrogen production. The reactor was fed with methane to fluidize a mixture of calcium oxide (CaO)/limestone (CaCO) sub(3)) and a Ni-alumina catalyst. Experimental tests investigated the influence of limestone loading, total membrane area and natural gas feed rates. Hydrogen-permeate to feed methane molar ratios in excess of 1.9 were measured. This value could increase further if additional membrane area were installed or by purifying the reformer off-gas given its high hydrogen content, especially during the carbonation stages. A maximum of 0.19 mol of CO sub(2 were adsorbed per mole of CaO during carbonation. For the conditions studied, the maximum carbon capture efficiency was 87%. The reformer operated for up to 30 min without releasing CO) sub(2) and for up to 240 min with some degree of CO sub(2 capture. It was demonstrated that CO) sub(2) adsorption can significantly improve the productivity of the reforming process. In-situ CO sub(2 capture enhanced the production of hydrogen whose purity exceeded 99.99%.)