Special catalyst for reaction for preparing synthesis gas through dry reforming of methane, and preparation method thereof

Abstract

The invention provides a special catalyst for a reaction for preparing synthesis gas through dry reforming of methane, and a preparation method thereof, wherein the catalyst has a chemical formula Rh / xLa2Ti2O7-yLa2Zr2O7 (x is 0-1, y is 0-1, and x+y is 1), Rh is an active component and accounts for 1.0-2.0% by mass, and the catalyst has performances of high-temperature sintering resistance, carbondeposition resistance and high selectivity. According to the present invention, with the application of the catalyst in a reaction for preparing synthesis gas through dry reforming of methane, when the reaction temperature is 800 DEG C, the service life of the catalyst is as long as 110 h and has no inactivation trend, the conversion rate of methane is kept at about 90%, the conversion rate of carbon dioxide is kept at more than 85%, and the H2 / CO ratio of the product is stabilized at about 0.93 and has no reduction trend; and the catalyst can effectively solve the problems of high-temperaturesintering and carbon deposition of the catalyst in the reaction for preparing synthesis gas through dry reforming of methane.

Description

Technical field: [0001] The invention belongs to the field of methane dry reforming and corresponding catalyst development, in particular to a catalyst specially used in the reaction process of methane and carbon dioxide dry reforming to produce synthesis gas and a preparation method thereof. Background technique: [0002] As the smallest molecule in organic compounds, methane is widely distributed in nature and is also an important chemical raw material and fuel. It not only has abundant natural reserves, but also can be obtained through various ways such as chemical synthesis, bacterial decomposition, and animal digestion. In addition, methane is a greenhouse gas, and the excessive emission of methane caused by the continuous growth of population is one of the common problems faced by human society. Therefore, reforming methane into more valuable synthesis gas (H 2 and CO) are of great significance. [0003] The technical route of methane reforming mainly includes the f...

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Problems solved by technology

Literature ACS Catalysis Volume: 9 Issues: 2 Pages: 932-945 (Publication Year: 2019) on Rh-La-based composite metal oxides 2 Zr 2 o 7 and Rh-La 2 Ti 2 o 7 Catalyzed DRM reaction research found: pyrochlore-type Rh-La 2 Zr 2 o 7 The surface Rh only exists in the form of single sites, showing excellent CH 4 Activation performance and anti-sintering ability; but too fast CH 4 The cracking rate caused a large amount of inert C* species to accumulate on the surface of the catalyst, resulting in the deactivation of the catalyst due to carbon deposition after 25 h of reaction

And perovskite-like Rh-La 2 Ti 2 o 7 Rh 0 and Rh δ+ active center, through the synergistic effect of the two can effectively increase the CO 2 The activation rate while CH 4 The cracking of the catalyst is also suppressed to a certain extent, the active O* species consumed on the surface of the catalyst is replenished in time, and the anti-coking ability of the catalyst is greatly improved, but as the reaction proceeds, the product H 2 The / CO ratio presents a gradually decreasing trend, indicating that the Rh-La 2 Ti 2 o 7 There are more side reactions in

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