Preparation method of methanation catalyst carrier

The invention discloses a preparation method of a methanation catalyst carrier. The method comprises the steps of (1) uniformly mixing alumina powder and lanthanum oxide, then adding water so as to prepare turbid liquid, and then adding a dilute nitric acid solution to the turbid liquid for reaction so as to prepare alumina sol; (2) dissolving magnesium nitrate and lanthanide nitrate in deionized water so as to prepare a mixed solution; (3) mixing the alumina sol and the mixed solution under a stirring condition for reaction, so that reactant is obtained; (4) drying and crushing the reactant, so that powder is obtained, adding stearate and deionized water to the powder, uniformly mixing, then granulating, screening, so that particles are obtained, pressing the particles into cylindrical particles, and then roasting for 1 h to 4 h, so that the methanation catalyst carrier is obtained. The preparation method has the advantages of simplicity and high efficiency, and the methanation catalyst carrier prepared by u