Preparation method for cobalt nickel catalyst loaded by tungsten carbide for preparing synthesis gas by partially oxidizing methane

Abstract

The invention discloses a preparation method for a cobalt nickel catalyst loaded by tungsten carbide for preparing synthesis gas by partially oxidizing methane. The preparation method comprises the following steps: (1) preparing the aqueous solution or alcoholic solution of soluble cobalt salt and soluble nickel salt, the aqueous solution or alcoholic solution of ammonium metatungstate, and tetraethyl orthosilicate of oxide auxiliaries; (2) fully mixing the solutions prepared in the step (1) and preparing the mixed solution into a mixture aqueous solution containing 5-10wt% of ammonium metatungstate; (3) introducing the acquired mixed solution into a spray drying device while stirring, performing spray drying, thereby acquiring a hollow globular cobalt salt and nickel salt / tetraethyl orthosilicate / H2WO3 grain precursor; (4) drying, thereby acquiring a silicon modified CoNi / H2WO3 catalyst precursor; and (5) taking a mixture of methane and hydrogen as a reduction carbonization atmosphere, performing carbonate calcining and reduction carbonization on the precursor acquired in the step (4), and cooling the product to room temperature under the protection of the inert gases after complete reaction, thereby acquiring the cobalt nickel catalyst loaded by tungsten carbide.

Description

technical field [0001] The invention relates to a method for preparing a cobalt-nickel catalyst supported by tungsten carbide for preparing syngas by partial oxidation of methane. Background technique [0002] With the increasing consumption of petroleum resources, the new synthetic routes of using natural gas as an alternative energy source to prepare high value-added liquid chemicals and other organic chemicals are highly valued by countries all over the world. my country's natural gas resources are very rich, and its effective development and utilization have very important practical significance for the strategic adjustment of my country's energy structure and sustainable economic development. The partial oxidation of natural gas to synthesis gas is an important intermediate link in the conversion of natural gas, and the research and development of efficient catalysts is the key. [0003] At present, the catalysts used for the partial oxidation of natural gas are mainly...

AI Technical Summary

Problems solved by technology

However, the interaction between the surface of the silicon carbide carrier and the metal nickel particles is relatively weak, and there are problems such as sintering and easy loss of the active component Ni in the catalytic reaction, resulting in carbon deposition and activity decline of the catalyst.