Catalyst for coal-to-natural gas high-temperature methanation and preparation method thereof

Abstract

The invention discloses a high-temperature-resistant methanation catalyst in a process of producing natural gas through coal. The high-temperature-resistant methanation catalyst comprises a carrier, an active component and assistants, wherein the carrier is a compound of CeO2, Al2O3 and ZrO2, the active component is Ni, the first assistant is one or two of alkaline earth metal oxides CaO and MgO, and the second assistant is one or two of transition metal oxides Cr2O3 and MnO. The high-temperature-resistant methanation catalyst disclosed by the invention has the advantages that the CeO2-Al2O3-ZrO2 compound oxide is used as the carrier to endow the catalyst with high mechanical strength, large specific surface area and heat resistance; the methanation activity of the catalyst is high and the thermal stability is strong; the alkaline earth metal oxide CaO and / or MgO are / is used as the first assistant to perfect the surface acidity of the carrier and inhibit carbon deposition of the catalyst; the Cr2O3 and / or MnO are / is used as the second assistant to beneficially improve the dispersibility of NiO particles and promote NiO reduction so as to improve the activity of the catalyst.

Description

technical field [0001] The invention relates to a methanation catalyst, in particular to a high-temperature-resistant methanation catalyst in the coal-to-natural gas process and a preparation method thereof. Background technique [0002] With the completion of my country's "West-to-East Gas Transmission" and "Sichuan-to-East Gas Transmission" projects, offshore natural gas landings and coastal LNG imports continue to increase, my country's natural gas industry has entered a period of rapid development, and the consumer market has grown rapidly. In 2012, the import volume of natural gas (including liquefied natural gas) was 42.5 billion cubic meters, a year-on-year increase of 31.1%. It is estimated that in 2020, the demand for natural gas is expected to exceed 300 billion Nm 3 , the market gap will reach 90 billion Nm 3 , by then 40% will depend on imports. [0003] my country is a country that is "rich in coal, poor in oil, and low in gas". Using my country's rich coal r...

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Problems solved by technology

Chinese patent CN 102319574 A reports a mesoporous γ-alumina modified by cerium oxide as a carrier, and oxides of transition metals iridium, lanthanum, copper, iron or alkaline earth metals magnesium and calcium as auxiliary agents for syngas methanation Catalyst; Chinese patent CN 10224 7861 A has reported a kind of coal-to-natural gas high-temperature methanation catalyst, with Ni or FeNi alloy as active component, with A1 2 o 3 and ZrO 2 As a carrier, one or more metals and / or their oxides in the group consisting of Mo, V, W, Ir, Cr, Mg, Ca, Y, Ce, La are used as additives, and the catalyst is not thermally stable. High (about 25%)

[0006] Although there are many patented technologies on methanation catalysts, there is still no record of long-term industrial operation of methanation catalysts above 600 °C, and the thermal stability of methanation catalysts in the prior art is generally not high. Methanation catalysts The system still needs to be further improved, especially the stability and activity of the methanation catalyst above 600°C needs to be further optimized

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