Monatomic catalyst for preparing synthesis gas by methane dry reforming as well as preparation method and application of monatomic catalyst

Abstract

The invention discloses a preparation method of a monatomic catalyst for preparing synthesis gas by methane dry reforming , the preparation process adopts a one-step synthesis method, the active component metal Ni in the obtained catalyst is uniformly dispersed on a carrier CeO2 in an isolated atom form, the catalytic stability can be effectively improved, and the preparation method has the advantage of simple steps. The invention also discloses the monatomic catalyst prepared by the method, monatomic dispersed Ni has high catalytic activity, Ni is limited by oxygen vacancy of CeO2, and sintering agglomeration of Ni at high temperature can be effectively prevented; and the doped second metal regulates and controls the oxygen vacancy concentration on the surface of CeO2, a large number of oxygen vacancies can effectively activate carbon dioxide, surface active oxygen is generated, and the influence of carbon deposition on the activity of the catalyst is inhibited. The invention also discloses an application of the monatomic catalyst in preparation of synthesis gas by methane dry reforming, the catalyst can be continuously used for 150 hours without obvious deactivation, and a good technical effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and relates to a single-atom catalyst for preparing synthesis gas by dry reforming of methane, a preparation method and application thereof. Background technique [0002] As the main component of natural gas, methane is an important chemical raw material. The main utilization methods of methane are divided into direct utilization and indirect utilization, but the efficiency of direct utilization of methane is very low, and it is generally converted into other industrial products for indirect utilization in industry. As an important process of methane conversion, methane dry reforming can convert methane and carbon dioxide, two greenhouse gases, into carbon monoxide and hydrogen, and the ratio of carbon monoxide and hydrogen is close to 1:1, which is convenient for subsequent Fischer-Tropsch synthesis of various high value-added chemical products process. Methane carbon dioxide reforming can n...

AI Technical Summary

Problems solved by technology

However, in the current research and production process, when the Ni catalyst is used in the reforming reaction, the catalyst carbon deposition phenomenon is relatively serious, mainly because the sintering of nickel metal promotes the occurrence of carbon deposition side reactions.

Especially when the methane dry reforming reaction temperature is lower than 600 °C, the carbon deposition phenomenon is more serious, which makes the catalyst easily deactivated, poor stability, and unable to continue production

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