| abstract |
method for producing an ethylenically unsaturated ester or carboxylic acid, and catalyst system. The invention relates to a method for producing an ethylenically unsaturated carboxylic acid ester or acid, preferably an a, b. The method includes contacting a formaldehyde or an appropriate source thereof with an ester or carboxylic acid in the presence of a catalyst and optionally in the presence of an alcohol. The catalyst comprises a nitrided metal oxide having at least two types of metal cations, m1 and m2, where m1 is selected from group 2, 3, 4, 13 (also called iiia) or 14 (also called iva) metals. ) of the periodic table and m2 is selected from the metals of groups 5 or 15 (also called va) of the periodic table. The invention extends to a catalyst system. |