Patent ID: 7696387

Claim:
A method for preparing a catalyst of formula (1) and partially oxidizing methylbenzenes using the catalyst; the formula (1): WOx wherein, W represents tungsten atom, O represents oxygen atom, and x represents a value determined by oxidative state of W, comprising: (a) a step of preparing a solution or slurry of the compounds comprising tungsten; (b) a step of supporting the solution or slurry obtained in the step (a) on an inorganic carrier to obtain a catalyst; (c) a step of drying the catalyst obtained in the step (b); (d) a step of calcining the dried catalyst obtained in the step (c); and (e) a step of gas-phase oxidizing methylbenzenes in the presence of the catalyst obtained in the step (d), wherein the ratio of the pore volume of the inorganic carrier and the volume of the solution or slurry in the step (b) is 1:0.9 to 1:1.1.