Process for preparing catalyst for producing methacrylic acid an

Details Process for preparing catalyst for producing methacrylic acid an Process for preparing catalyst for producing methacrylic acid an

1991-04-22

1992-06-30

Shine, W. J.

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Nitrogen compound containing

502205, 502209, B01J 3704, B01J 2388, B01J 2718, B01J 2378

Patent

active

051263076

ABSTRACT:
A process for preparing a multi-component catalyst for producing methacrylic acid, containing phosphorus, molybdenum and vanadium, comprising mixing oxides of molybdenum and vanadium, water and materials for the other catalyst-constituting elements except potassium, rubidium, cesium and thallium to prepare a mixed solution, heating and reacting the mixed solution at 85.degree. C. or more for 1 to 10 hours, then cooling the mixed solution to 80.degree. C. or less, adding thereto a material for at least one element component selected from the group consisting of potassium, rubidium, cesium and thallium, adding further thereto at least one compound selected from the group consisting of ammonium nitrate, ammonium carbonate, ammonium hydrogencarbonate, ammonium sulfate and ammonium hydrogensulfate with the temperature of the mixed solution kept at 80.degree. C. or less, then removing water therefrom and heat-treating the residual product. According to the present invention, a catalyst which works effectively at a lower reaction temperature and yet gives methacrylic acid in higher yields than when catalysts prepared by the conventional methods are used is prepared.

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