A slurry-bed nickel-based methanation catalyst prepared by precipitation combustion method and its application

Abstract

The invention relates to a slurry reactor nickel-based methanation catalyst prepared according to a sediment burning method and an application thereof. The invention relates to a methanation nickel-based catalyst prepared according to the sediment burning method and a preparation method thereof. The methanation catalyst comprises the following raw materials by mass percent: 15-50wt% of Ni, 47-80wt% of Al2O3 and 1-10wt% of auxiliaries, wherein the auxiliaries are selected from one or two of Dy2O3, La2O3, Eu2O3 and Gd2O3; the grain size of the catalyst is 60-220 meshes; the specific surface area is 150-250 m<2> / g; the Ni crystal grain size is 12-16nm. The methanation catalyst provided by the invention has the advantages that the preparation process is simple, the preparation period is short and the activity and selectivity in the slurry reactor methanation reaction are high.

Description

technical field [0001] The invention relates to a preparation method and application of a nickel-based catalyst, in particular to a nickel-based methanation catalyst applied to a slurry bed methanation reaction and a preparation method thereof. Background technique [0002] Natural gas is a clean, safe and convenient high-quality energy. In recent years, with the rapid development of economic construction, the demand for natural gas has continued to grow. In 2014, the apparent consumption of natural gas in my country was 180 billion cubic meters, a year-on-year increase of 7.4%, of which the external dependence reached 32.2%. my country is rich in coal resources, and more than 80% of coal is directly burned every year. Compared with developed countries, the level of deep utilization of coal is relatively low. The use of coal-to-gas technology to convert abundant coal resources into natural gas not only effectively increases energy utilization, but also greatly reduces green...

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Problems solved by technology

However, some characteristics of the precipitation method also limit its application: (1) The catalyst prepared by the precipitation method has a small specific surface area and large crystal grains, resulting in fewer active sites on the surface of the catalyst and poor dispersion; (2) The synthesis process of the precipitation method It needs to be aged, washed, dried and roasted, which has high requirements on the control process and increases the production cost.

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