Preparation method of nickel-based catalyst based on SBA-15 and application of nickel-based catalyst in SNG preparation

Abstract

The invention discloses a catalyst for carbon monoxide methanation and application of the catalyst in reaction of methane prepared from synthesis gas. The catalyst is characterized in that a mesoporous molecular sieve SBA-15 is used as a carrier; metal Ni is used as a main active ingredient; based on metallic elements, 100 parts by weight of the catalyst comprise10-30 parts by weight of nickel and the balance being a molecular sieve SBA-15. When the catalyst is prepared, the mesoporous molecular sieve SBA-15 is impregnated in a nickel salt solution, dried in vacuum, and roasted. In the invention, a traditional method, in which aluminium oxide is used as the carrier, for preparing the methanation catalyst is changed, the mesoporous molecular sieve SBA-15 is used as the carrier to prepare the catalyst which is high in catalytic activity, excellent in methane selectivity, and relatively long in catalyst service life, and the prepared catalyst also has the relatively good activity under low temperature; for the catalyst, the CO conversion rate is 100%, the methane selectivity is 96%, and the methane yield is 96% under the best condition, and thus the catalyst has a relatively wide industrial prospect.

Description

technical field [0001] The invention belongs to the technical field of fine chemicals, and in particular relates to the preparation of a supported catalyst and its application in synthesis gas to methane. Background technique [0002] In recent years, with the continuous growth of the world economy, the demand for energy has been increasing, the prices of oil and natural gas have soared, and the problem of global warming has become increasingly serious. With the implementation of domestic sustainable development strategies and environmental protection policies, since the carbon emissions of methane combustion are much lower than that of oil and coal, natural gas, as a high-quality and efficient clean energy, is strongly sought after by the international market, and the natural gas consumption market continues to grow. With the improvement of people's living standards and the increasing demand of industries, the demand for natural gas is increasing. Although my country's an...

AI Technical Summary

Problems solved by technology

Although Ni / Al 2 o 3 and Ni / ZrO 2 The catalytic activity is very good, but NiO and A1 2 o 3 The interaction will cause difficulty in catalyst reduction, while Ni / ZrO 2 As the reaction proceeds, the activity of the catalyst will decrease, which is due to the tetragonal ZrO 2 transformed into monoclinic ZrO 2 , is not conducive to the reaction

And ZrO 2 Carrier price ratio Al 2 o 3 and SiO 2 Expensive, easy to agglomerate at high temperature, therefore, less used in CO methanation reaction

while TiO 2 Due to the high cost, the performance needs to be further improved, so it is less used

Although SiO 2 The carrier has a good pore structure and a large specific surface area, but SiO 2 The mechanical strength of the carrier is not high, and the interaction between the metal component and the carrier is not strong, it is difficult to play a synergistic catalytic effect with the active component, and it is easy to sinter and agglomerate in the strong exothermic methanation reaction, and deactivate quickly

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