Process for making a catalyst suitable for direct coal liquefaction and the catalyst thereof
OwnerJose De Jesus Diaz Velasquez, Yazmin Yaneth Agamez Pertuz +4inventors
InventorsJose De Jesus Diaz Velasquez, Yazmin Yaneth Agamez Pertuz, Luis Ignacio Rodriguez Varela, Orlando Hernandez Fandino, Oscar Andres Villaba Varon, Jose Alexandre Jimenez Sanchez
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Abstract
A method to obtain a catalyst of transition metals supported on a carbonaceous material, via impregnation, with a solution of metal-thiourea complex, obtained from precursor salts. The formation of the sulfur on the surface of the support occurs through the thermal decomposition of the complex. The obtained catalysts are applicable toward the direct liquefaction of coal.
Claims14
A process to obtaining a catalyst suitable for direct coal liquefaction characterized in that the following steps are carried out:
- a) Preparation of the metal-thiourea coordination compounds by adding an aqueous solution of a precursor salt of one or more transition metals selected from molybdenum, iron, nickel, or cobalt to a thiourea solution, at room temperature that can be selected from the interval between 290 and 307 K, and where the addition of the precursor salt to the thiourea is carried out at a flow of 0.5 to 1 mL/min;
- b) Impregnation of a carbonaceous material, thermally stabilized at temperatures between 973 and 1473 K, used as support of the catalyst under vacuum and sonicated;
- and
- c) Catalyst activation by thermal treatment at selected temperatures between 420 and 460 K and atmospheric pressure.
A coal liquefaction catalyst, comprising:
- a) an active phase which is a sulfur-containing transition metal selected from molybdenum, iron, nickel, cobalt or mixtures thereof, obtained with the addition of an aqueous solution of a precursor salt to the thiourea solution at a flow rate of 0.5 to 1 mL/min and at temperatures between 290 to 307 K, and subsequent activation by thermal treatment at selected temperatures between 420 and 460 K and atmospheric pressure;
- and
- b) a coke or coked carbonaceous material from coking coal which has been subjected to thermal stabilization at temperatures between 973 and 1473 K to be inert in the conditions of direct coal liquefaction.
Dependencies are inferred from the claim text.