Abstract: The present application relates to the technical field of carbon material preparation, and provides a porous carbon and a preparation method thereof. The preparation method includes: subjecting a plant tissue to a first drying treatment, a crushing treatment, and a dehydration treatment sequentially to obtain an oxygen-rich matrix, with a temperature of the dehydration treatment being 120-320° C.; mixing heavy oil, an activator, and a solvent to obtain a mixed solution; impregnating the oxygen-rich matrix in the mixed solution, with an impregnating duration being ?10 min; then removing the solvent to obtain a composite; calcining the composite to obtain the porous carbon. The disclosure can obtain porous carbon that balances high specific surface area, mesoporous specific surface area, total pore volume, compaction density, and particle strength.

Abstract: Provided is a method and device for viscosity-reducing and upgrading of low-grade heavy oil. The method comprises: (a) performing visbreaking reaction on low-grade heavy oil raw material and controlling the content of toluene insolubles in the produced oil; (b) mixing the produced oil in step (a) with hydrogen in a gas-liquid mixer to obtain a hydrogen-oil mixture in liquid state, or mixing the produced oil in step (a) with hydrogen to obtain hydrogen-oil mixture in gas-liquid state; in the presence of a hydrogenation catalyst, performing hydrogenation reaction on the hydrogen-oil mixture in liquid state or the hydrogen-oil mixture in gas-liquid state in the reactor, and obtaining a viscosity-reduced and upgraded oil after the reaction. It is viscosity-reducing and upgrading method by combining thermal visbreaking and fixed-bed hydrogenation, which can solve the problems of high viscosity, high density and poor stability of low-grade heavy oil products in the prior art.