Nickel iridium-oxide composite catalyst and preparation method thereof

Abstract

The invention relates to a nickel iridium-oxide composite catalyst and a preparation method thereof. The invention is characterized in that a stainless steel screen framework with the mesh diameter of 1-100 mu m can be subjected to electrochemical codeposition to obtain the compact nickel iridium-oxide composite catalyst with uniform component distribution, fine crystal grain, carbon deposition resistance, high catalytic activity and enduring stability. The oxide in the composite catalyst is composed of one or more of SiO2, ZrO2, CeO2, La2O3, Al2O3, TiO2 and the like, and the iridium content in the catalyst is 0.01-20 at%. The preparation method of the composite catalyst comprises the following steps: dissolving 0.001-1.0 mol / L nickel salt, 0.005-0.100 mol / L iridium salt crystalline water iridous chloride, 0.1-1.0 mol / L complex citric acid, 0.1-100 g / L nano oxide particle and 0.0001-0.005 mol / L additive in deionized water according to certain molar concentration, and carrying out nickel iridium-oxide composite catalyst electrochemical codeposition on the pretreated workpiece electrode surface under the auxiliary action of ultrasonic to obtain the nickel iridium-oxide composite catalyst.

Description

Technical field [0001] The invention relates to a catalyst, in particular to a nickel-iridium-oxide composite catalyst and a preparation method thereof. Background technique [0002] In recent years, people have devoted themselves to converting methane, the main component of natural gas, into high value-added hydrocarbons. In particular, the catalytic reforming of methane and carbon dioxide into synthesis gas using two greenhouse gases at the same time has attracted considerable attention in recent years. Methane and carbon dioxide reforming can produce synthesis gas with a low ratio of hydrogen to carbon monoxide, and synthesis gas with a low ratio of hydrogen to carbon monoxide is more suitable for the production of chemical raw materials such as formaldehyde, polycarbonate and ethanol. The carbon dioxide reforming methane reaction process can be used in carbon dioxide-rich natural gas fields to reduce the cost of carbon dioxide separation. Therefore, the development and resea...

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Problems solved by technology

The wet impregnation process is simple to operate, but requires high temperature decomposition, and the purity of the nickel-iridium alloy obtained is poor, which affects the catalytic effect

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