Catalyst for reforming methane and carbon dioxide to prepare synthesis gas, and preparation method for catalyst

Abstract

The invention discloses a catalyst for reforming methane and carbon dioxide to prepare synthesis gas. The catalyst is prepared from the components in percentage by mass: 2-3% of metal iridium and 97-98% of a cerium oxide-based solid solution, wherein the cerium oxide-based solid solution is pure cerium oxide, a cerium oxide-lanthanum oxide solid solution, a cerium oxide-praseodymium oxide solid solution, a cerium oxide-zirconium oxide solid solution or a cerium oxide-titanium oxide solid solution. According to the invention, the catalyst for reforming methane and carbon dioxide to prepare synthesis gas is prepared through a simple deposition-precipitation, coprecipitation or sequential precipitation method, and the catalyst shows the characteristic of high catalytic efficiency in reforming reaction of dried methane gas at 750-800 DEG C, and has relatively good stability.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a catalyst for producing synthesis gas by reforming methane and carbon dioxide and a preparation method thereof. Background technique [0002] Methane (CH 4 ) is the main component of natural gas and one of the most stored fossil energy sources in nature. It is an important carrier of human energy utilization at present. The activation and conversion of methane has become a hot topic in the field of energy research by governments and scientists in various countries. The technology of converting methane into synthesis gas or hydrogen represented by water vapor reforming, partial oxidation and dry gas reforming has become a hot topic in methane conversion research. Since the dry gas reforming reaction can theoretically obtain a synthesis gas with a molar ratio of hydrogen and carbon monoxide of 1:1, which is beneficial to the next step of the Fischer-Tropsch synthesis process to...

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Problems solved by technology

[0004] Both noble metals represented by rhodium and non-precious metals represented by nickel have good activity for methane dry gas reforming reaction, but nickel catalysts are prone to generate a large amount of carbon deposits and cause reactor blockage

Judging from the current research results, the problem of carbon deposition and deactivation of nickel catalysts is basically unavoidable, so there is still a long way to go for long-term high-temperature industrial use of nickel catalysts to achieve methane dry gas reforming reactions (Chinese patent CN103586030A)

Although Chinese patent CN102745648A has reported a long-lived nickel catalyst, its test conditions are too high and the space velocity is also low

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