Catalytic reactions of products from the rapid hydropyrolysis of coal at atmospheric pressure

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The catalytic reactions of hydropyrolysis tars from a subbituminous coal have been studied at atmospheric pressure in a two-stage reactor. The first stage consisted of a fluidized-bed reactor that produced hydrocarbon gas and tars at high particle heating rates. The gas and tars were separated from char and ash and passed to a second-stage fixed-bed catalytic reactor, packed with a NiMo/γ-Al 2 O 3 hydrotreating catalyst. Detailed analyses of the compositions of the liquid products showed that the catalyst was responsible for cracking reactions of long-chain aliphatic groups to light hydrocarbon gases and aromatization reactions that produce highly condensed polycyclic aromatic hydrocarbons