Preparation method of nickel-containing mesoporous catalyst

Abstract

The invention relates to the technical field of preparation and application of a catalyst for preparing synthetic natural gas from coke oven gas and coal and particularly relates to a preparation method of a nickel-containing mesoporous catalyst. The method comprises the following steps: taking aluminum oxide as a carrier, taking nickel oxide as a main active component and taking magnesium oxide and cobalt oxide as additives, preparing a catalyst precursor by using a method of coprecipitating nitrate and sodium aluminate, then roasting at the high temperature to prepare the catalyst. According to the nickel-containing mesoporous catalyst prepared by the method, all the components of the catalyst are uniformly dispersed, so that the dispersity of nickel which is used as the active component is improved; through the formed regular pores, the specific surface area of the catalyst is increased, so that the active site is in full contact with the raw material gas and rapidly carries out methanation; the magnesium oxide and the cobalt oxide which are used as the additives are added, the sintering resistance and the inhibition of carbon deposition of the catalyst in the high-temperature reaction environment are improved, and meanwhile, the selectivity is also improved. The catalyst has high low-temperature activity; the catalyst can be activated at 200 DEG C; the conversion ratio of CO can reach up to 98% at 230 DEG C; the selectivity of CH4 is greater than 96%.

Description

technical field [0001] The invention relates to the technical field of preparation and application of coke oven gas and coal synthesis natural gas catalysts, in particular to a preparation method of a nickel-containing mesoporous catalyst. Background technique [0002] Natural gas is a clean fuel with high calorific value. It will not produce polluting gases such as sulfides and nitrides when burned, and it has stable supply and safe storage. China is rich in coal, poor in oil, and poor in gas resource distribution. Natural gas resources are extremely scarce. Facing the rapid growth of natural gas consumption, it cannot meet the country's demand for clean energy. Therefore, the supply contradiction of natural gas is prominent. Using coke oven gas or coal methanation to produce natural gas is a new method. It can not only effectively use resources, but also reduce environmental pollution, and at the same time ensure the safety of transportation. One of the effective ways to ...

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Problems solved by technology

CN103480375A uses Al2O3 as a carrier, adopts the method of co-precipitation to prepare nickel catalyst, needs to add precipitant, increases cost, and process is cumbersome, and is not suitable for being widely used in the field of catalysis

CN102513115A adopts the impregnation method to load nickel, which cannot ensure the uniformity of nickel dispersion, and thus cannot achieve ideal catalytic activity

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