Catalyst for reforming methane with carbon dioxide for preparing synthetic gas and preparation method thereof

Abstract

The invention relates to a catalyst for reforming methane with carbon dioxide for preparing synthetic gas, which is a bead catalyst prepared by taking SiO2 as a vector and Ni and La as active components by a co-impregnation method. The catalyst provided by the invention has good mechanical properties and thermal stability, long service life, simple preparation method, low cost and easy acquisition of raw materials, relatively mild reaction conditions and no need of any diluent gas; the catalyst has good catalytic property for reforming the methane with the carbon dioxide for preparing the synthetic gas; the conversion rates of the methane and the carbon dioxide can respectively reach 79.4-90.8% and 86.1%-92.8% under ordinary pressure; and the volume ratio CO to H2 in the prepared synthetic gas is 1.13-1.18.

Description

technical field [0001] The invention belongs to a catalyst for producing synthesis gas by reforming methane with carbon dioxide and a preparation method thereof. Background technique [0002] Carbon dioxide reforming of methane to produce synthesis gas has attracted more and more attention because it can simultaneously utilize two greenhouse gases (CH 4 and CO 2 ) as a carbon source, thereby reducing the emission of greenhouse gases, which is of great significance to environmental protection. Simultaneously produced syngas has H 2 The characteristic of / CO≤1 can be applied to Fischer-Tropsch synthesis to produce high value-added chemicals such as higher hydrocarbons, turning waste into treasure. In addition, because of the highly endothermic nature of the reaction, it also serves as a promising route to convert solar energy into chemical energy. CH 4 +CO 2 =2CO+2H 2 ΔH θ 298 =247kJ / mol [0003] In recent years, many scientific researchers have carried out extensi...

AI Technical Summary

Problems solved by technology

(2) The preparation method of the carrier and the catalyst; the preparation method of the carrier or the catalyst is different, and the performance of the catalyst will show a big difference

However, due to the cracking of methane and the disproportionation reaction of CO at high temperature, it is easy to cause carbon deposition on the nickel-based catalyst and sintering of the metal to deactivate it, which limits its practical industrial application.

[0005] At present, although a series of important achievements have been made in the selection and design optimization of catalysts, catalyst deactivation characteristics, kinetic behavior and reaction mechanism, the carbon dioxide reforming methane reaction system still has a certain gap from the requirements of industrialization.

The main problem is the high energy consumption in the reforming process, and the catalyst is prone to deactivation due to carbon deposition and sintering. Therefore, the development of a more stable and efficient catalyst under mild conditions is considered to be a key research direction in this field in the future.

Images