Abstract
AbstractK2CO3‐catalyzed steam gasification of low‐rank coal in a fixed bed reactor was investigated in order to elucidate the effects of temperature and catalyst loading amounts on hydrogen yield. The optimum conditions for H2‐rich syngas were 102.08 g kg−1 coal at 1073 K with 20 wt % K2CO3; the carbon conversion (XC) reached 72.63 wt % and the cold gas efficiency (ηCGE) reached 87.05 %, simultaneously. However, at 1073 K the tar yield was too small to be ignored. Through Brunauer–Emmett–Teller (BET), Barrett–Joyner–Halenda (BJH), t‐plot, scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analyses of the gasification process, the surface area and micro‐pore volume were found to reach a maximum value at 20 min, while the average pore size reached a maximum value at 10 min. XC was promoted by the enlargement of average pore size and surface area, mainly caused by coal devolatilization. Potassium compounds tightly adhered to the surface and interpore sites of coal, capturing sulfur compounds to form K2SO4.
Published Version
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