Support for gas-phase oxidation catalyst and process for its...

Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Silicon containing or process of making

Reexamination Certificate

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C502S255000, C502S312000, C502S321000, C502S322000, C502S349000, C502S350000, C502S353000, C502S354000, C502S407000, C502S415000, C502S439000, C502S351000, C502S355000

Reexamination Certificate

active

07456129

ABSTRACT:
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.

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