一种低温高活性甲烷化催化剂及其制备方法

Low-temperature high-activity methanation catalyst and preparation method thereof

Abstract

The invention discloses a low-temperature high-activity methanation catalyst and a preparation method thereof. The catalyst comprises metallic nickel as an active component, AL2O3 as a carrier and MgO as a structure auxiliary agent, and an appropriate amount of lanthanum oxide and manganese oxide are added as active auxiliary agents. The catalyst comprises the following main components in percentage by mass: 18-45% of NiO, 40-70% of Al2O3, 5-30% of MgO, 0.4-5% of La2O3 and 0.1-5% of MnO2. The catalyst disclosed by the invention has the advantages of large specific area, uniform nickel dispersity, good heat stability, strong oxidation resistance, low active temperature, adaptability to low hydrogen-carbon ratio and the like. The catalyst is applicable to preparation of LNG (liquefied natural gas) through methanation of industrial gases including coke oven gas, coal synthesis gas, semi coke exhaust gas and the like rich in CO, CO2 and H2, is particularly applicable to a methanation reaction in a low-temperature section, and can effectively improve the quality of synthetic natural gas. Meanwhile, the invention also provides the preparation method of the catalyst, and the preparation method is simple in process flow and can realize industrial production easily.
本发明公开了一种低温高活性甲烷化催化剂及其制备方法。该催化剂以金属镍为活性组分,Al2O3为载体,MgO为结构助剂,并添加适量的氧化镧和氧化锰作为活性助剂;其主要组分质量百分比分别为:NiO:18%~45%,Al2O3:40%~70%,MgO:5%~30%,La2O3:0.4%~5%,MnO2:0.1%~5%。本发明催化剂具有比表面大、镍分散性均匀、热稳定性好、抗氧化性强、活性温度低和适应低氢碳比等优点。可适用于焦炉气、煤制合成气、兰炭尾气等富含CO、CO2、H2的工业气体甲烷化制LNG中,尤其适用于低温段的甲烷化反应,能有效提高合成天然气的品质。同时,本发明还提供该催化剂的制备方法,该法工艺流程简单,易于实现工业化生产。

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    CN-104028276-ASeptember 10, 2014中国华能集团清洁能源技术研究院有限公司, 中国华能集团公司Method for preparing composite wide-temperature methanation catalyst
    CN-104028276-BMarch 30, 2016中国华能集团清洁能源技术研究院有限公司, 中国华能集团公司一种复合型宽温甲烷化催化剂的制备方法
    CN-105233834-AJanuary 13, 2016四川天一科技股份有限公司一种预还原型高温合成气甲烷化催化剂及其制备方法
    CN-105498781-AApril 20, 2016大唐国际化工技术研究院有限公司Coke-oven gas methanation catalyst and preparation method and application thereof
    CN-105618157-AJune 01, 2016中国科学院大连化学物理研究所一种双峰介孔复合氧化物载体及其制备方法和应用