Support for gas-phase oxidation catalyst and process for its production, gas-phase oxidation catalyst, and process for producing acrylic acid

摘要

A support for a gas-phase oxidation catalyst, the support including a solid acid, of which acid strength (H₀) meets an inequality: −5.6≦H₀≦1.5; a gas-phase oxidation catalyst including the above support and a complex oxide containing molybdenum and vanadium as essential components, the complex oxide being supported on the support; a process for producing acrylic acid by gas-phase catalytic oxidation of acrolein with molecular oxygen, the process including carrying out the gas-phase catalytic oxidation in a presence of the above gas-phase oxidation catalyst; and a process for producing the above support, the process including controlling an acid strength (H₀) of a solid acid so as to meet an inequality: −5.6≦H₀≦1.5 by adjusting a calcination temperature in a preparation of the solid acid contained in the support.