Catalytic CO2 gasification of a Powder River Basin coal

Abstract

CO 2 gasification of Wyodak low-sulfur sub-bituminous coal from the Powder River Basin (PRB) of Wyoming was conducted in a fixed-bed laboratory gasifier at atmospheric pressure with Na 2 CO 3 , an inexpensive catalyst widely available in Wyoming. The sodium effect on the coal pyrolysis and the sodium forms existing during the char gasification were investigated using thermo-gravimetric analyses (TGA) and X-ray diffraction (XRD) analyses, respectively. Sodium was found to decrease the tar production and promote the char condensation during the pyrolysis. The interaction between added sodium and the minerals in Wyodak coal were observed during the char gasification. Grain, integrated, and random pore models were employed to fit the kinetic data obtained under both non-catalytic and catalytic

Gas evolution characteristics during pyrolysis and catalytic pyrolysis of coals by TG–MS and in a high-frequency furnace

“…The yields of both H 2 and CO increase significantly with the increase of pyrolysis temperature. H 2 yield also exhibits a generally increasing trend with increasing loading amount of Na 2 CO 3 when the pyrolysis temperature was kept constant, and the similar conclusion was also drawn in Popa et al and Feng et al's researches [3,28]. Popa et al concluded that the added Na + and the -OH or -COOH groups in coal could react and form -ONa or -COONa, and release H + as presented below [3],…”

Catalytic Coal Gasification

“…Zhang et al [71] studied the interaction of added Na 2 CO 3 and primary minerals in coal gasification, and found that the combination of sodium with either silicon or aluminium changed with carbon conversion and gasification temperatures. Zhang et al [71] studied the interaction of added Na 2 CO 3 and primary minerals in coal gasification, and found that the combination of sodium with either silicon or aluminium changed with carbon conversion and gasification temperatures.…”

Study on the Pyrolysis Characteristics of a Typical Low Rank Coal with Hydrothermal Pretreatment

“…Its generation consists of the formation and rearrangement of free-radical fragments. As reported in previous studies, − the formation of tar precursors was hindered by the existence of AAEM metals because of their cross-linking effects. The AAEM metals in treated coal samples were efficiently removed and hydrogen radical was introduced, which are beneficial to the formation and stabilization of free-radical fragments in time during the pyrolysis process.…”