Catalytic upgrading of coal pyrolysis tar over char-based catalysts

Effect of calcium additive on product yields in hydrogasification of nickel-loaded Chinese sub-bituminous coal

“…Interestingly, these results were not consistent with previous literature. Xu et al [24] reported that in the presence of the catalyst (Ni-char), the total tar yield markedly reduced, while the non-condensable gas yield and the fraction of light tar (boiling point < 360°C) showed an opposite trend. However, in this work the yield of coal tar increased obviously with increasing amount of co-loaded calcium, which was due to the hydrogenation of poly-aromatics in tar molecules before hydrocracking.…”

Catalytic upgrading of gaseous tars over zeolite catalysts during coal pyrolysis

“…It can be seen that USY zeolite can provide more acid sites and the catalytic cracking reaction can proceed more easily. Han et al [18,19] did a study about catalytic coal pyrolysis tar using char-based catalysts loaded with different metals, and found that their catalytic activity for upgrading tar is correlated to the number of acid sites on the catalyst. Therefore, compared to Al/SBA-15 zeolite, USY zeolite has higher number of acid sites, and resulting in a better performance on the catalytic upgrading of gaseous tars.…”

Thermochemical conversion of Phellinus pomaceus via supercritical fluid extraction and pyrolysis processes

“…There have been many studies in which effect of the catalyst on the quantity and specifications of the products obtained at the liquefaction and pyrolysis processes have been researched [57][58][59][60][61]. It has been seen that the catalyst used have much effect on the quantity and specifications of the products obtained.…”