Solid oxide fuel cell(SOFC) for coproducing syngas and electricity by the internal reforming of carbon dioxide by hydrocarbons and electrochemical membrane reactor system

Abstract

The present invention relates to a solid oxide fuel cell for internal reforming of hydrocarbons and carbon dioxide, in particular, to a solid oxide fuel cell in which one side of solid oxide electrolyte (YSZ) is attached to an air electrode (La 0.8 Sr 0.2 MnO 3 ) and its other side is attached to a catalyst electrode of Ni-YSZ type or perovskite type metal oxide. The electrochemical conversion system using the solid oxide fuel cell permits the occurrence of internal reforming of hydrocarbons and carbon dioxide concomitantly with the coproduction of a syngas and electricity, and overcomes the shortcomings associated with the catalytic deactivation due to carbon deposition and the high-energy consumption.

1 - 7 . (canceled) 
   
   
       8 . A process for preparing an electrochemical cell for internal reforming of methane and carbon dioxide, comprising the steps of:
 (a) preparing an aqueous solution of metal precursors having a composition of La 1-y Sr y Ni 1-x Cr x O 3  (x=0-1 and y=0-1);   (b) adding malic acid to said aqueous solution of metal precursors for adjusting a mole ratio of malic acid to the total metal ions to 0.5-2.0;   (c) adding a pH regulator for adjusting pH of said aqueous solution of metal precursors to 1.5-3.5;   (d) drying and heat-treating said aqueous solution of metal precursors to obtain powder;   (e) sintering said powder at 800-1000° C. for 1-5 hr under air atmosphere to obtain a perovskite type catalyst having a composition of La 1-y Sr y Ni 1-x Cr x O 3  (x=0-1 and y=0-1); and   (f) coating one side of a planner-type solid oxide electrolyte with the catalyst electrode slurry prepared above and the other side with an air electrode material (LSM), drying and sintering to prepare the electrochemical cell in a disk shape.   
   
   
       9 . A process for preparing an electrochemical cell for internal reforming of hydrocarbon and carbon dioxide, comprising the steps of:
 (a) preparing an aqueous precursor solution having a composition of 40-55 wt % of Ni 40-55 wt % of YSZ and 0-10 wt % of CeO 2  or MgO;   (b) adding and mixing 0.3-1.2 wt % of methyl cellulose 0.8-1.5 wt % of carbonylmethyl cellulose and 1.3-2 wt % of polyethylene oxide as a binder, and 1-5 wt % of isopropylalcohol (IPA) as a dispersant based on 100 wt % of solid content to said aqueous precursor solution, and then ball-milling to obtain a Ni-YSZ type anode slurry; and   (c) coating one side of a planner-type solid oxide electrolyte with said catalyst electrode slurry prepared above and the other side with an air electrode material (LSM), drying and sintering to prepare the electrochemical cell in a disk shape.