Method of producing carrier for catalyst for oxidative dehydrogenation of n-butane, method of producing carrier-supported magnesium orthovanadate catalyst, and method of producing n-butene and 1, 3-butadiene using said catalyst

1. A method for preparing a carrier for a catalyst for oxidative dehydrogenation of n-butane comprising the following steps:

(a) preparing each alcohol solution of zirconium and oxalic acid by dissolving the zirconium precursor and oxalic acid into an alcohol, respectively, wherein a molar ration of oxalic acid to zirconium being 2-5 to 1;

(b) synthesizing zirconia by mixing the alcohol solution of zirconium and the alcohol solution of oxalic acid prepared in the above step (a);

(c) obtaining zirconia used for the preparation of a magnesia-zirconia complex carrier by separating, drying and heating the solid component zirconia from the solution resulted from the above step (b);

(d) impregnating zirconia obtained from the above step (c) with an aqueous magnesium salt solution; and

(e) obtaining a magnesia-zirconia complex carrier for a catalyst for oxidative dehydrogenation of n-butane by drying and heating the product resulted from the above step (d).

2. The method according to claim 1 , wherein the molar ratio of magnesia:zirconia in the magnesia-zirconia complex carrier obtained from the step (e) is 0.5-16:1.

3. The method according to claim 1 , wherein the zirconium precursor is at least one selected from the group consisting of zirconium chloride, zirconium oxynitrate and zirconium oxychloride.

4. The method according to claim 1 , wherein the mixing of the alcohol solution of zirconium and the alcohol solution of oxalic acid is carried out by stirring at 1-12 hours.

5. The method according to claim 1 , wherein, in the step (c), drying is carried out at 50˜200° C. for 3-24 hours, and heating is carried out at 350˜800° C. for 1-12 hours.