Energy-saving and environment-friendly acrylic acid production method and catalyst used in method

The invention discloses an energy-saving and environment-friendly acrylic acid production method and a catalyst for the method, and the production method comprises the following steps: firstly, carrying out gas-phase catalytic oxidation on propylene, and cooling and absorbing the obtained reaction gas with water to form a crude acrylic acid aqueous solution; the separation of acrylic acid from water and acetic acid is realized through azeotropic distillation. At the top of the light component removal tower, separation of the entrainer and the water phase is realized in a fractionation/sedimentation manner, the entrainer is used as tower top reflux, and the water phase is sent back to the quench tower to be used as absorption water, so that the process water consumption is greatly reduced; a condenser is additionally arranged at the top of the quenching tower, the content of acid gas in tail gas is reduced, the tail gas circulation proportion is increased, and the invention further provides an acrolein catalys