Abstract
The early stages of low-temperature catalytic hydrogenation were studied with the aim of following changes in the macromolecular network component of coal during catalysed hydropyrolysis/hydroliquefaction. Reactions were carried out using a subbituminous coal in the presence of MoS 2 at 15 MPa H 2 and 300–450 °C in a tubing bomb reactor and a swept fixed-bed reactor. The changes in the coal structural network were characterized by volumetric swelling ratios in pyridine, infrared spectroscopy and solid-state nuclear magnetic resonance and the mineral matter content was determined by low-temperature ashing. The oils were analysed by chromatography. The use of two different reactors allowed the effect of the hydrogenation system on the coal network structure to be assessed. To infer information on coal structure, the fixed-bed reactor is preferable because retrogressive reactions are minimized. However, in the tubing bomb the hydrogenation is deeper, and less severe conditions are needed to obtain high yields of conversion products.
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