| abstract |
The present invention relates to a novel heteropolyacid catalyst defined by the following Chemical Formula 1 used in the process of partially oxidizing methacrolein to produce methacrylic acid, and a method for preparing the same. 4 ) adding 6 Mo 7 O 24 and (NH 4 ) VO 4 , H 3 PO and / or pyridine to form an aqueous solution; b) preparing an ammonium heteropolyacid using nitric acid; c) mixing the carbonate and / or nitrate of the transition metal; d) drying and firing in an air atmosphere; and the surface of the prepared catalyst has a hexahedron shape of 20 to 100 nm, and exhibits higher activity than a catalyst prepared by conventional coprecipitation.n n n <Formula 1>n n n PMo a A b B c C d D e E f O g n n n (Wherein A, B, C, D, E, a, b, c, d, e, f and g are as defined in the specification) |