Catalyst For Methacrylic Acid Production, Process For Producing The Same, And Process For Producing Methacrylic Acid Using The Catalyst

A process for producing a catalyst for methacrylic acid production, comprising the following steps:

• Step a):
• a step of preparing a slurry containing at least molybdenum, phosphorus and vanadium;
• Step b):
• a step of cooling the slurry obtained in Step a) and subsequently adding an alkali metal compound with stirring of the slurry to prepare a slurry of a partially neutralized salt of a hetero polyacid;
• Step c):
• a step of adding an ammonium compound to the slurry obtained in Step b);
• Step d):
• a step of drying the slurry, to which the ammonium compound has been added, obtained in Step c) to obtain a dry powder having a composition shown by the following (Formula 1);
• Step e):
• a step of shaping the dry powder obtained in Step d);
• and
• Step f):
• a step of calcinating the shaped product obtained in Step e):
• Mo10VaPb(NH4)cXdYeOf (Formula 1)
• wherein Mo represents molybdenum;
• V represents vanadium;
• P represents phosphorus;
• (NH4) represents an ammonium group;
• X represents at least one alkali metal element selected from the group consisting of K, Rb and Cs;
• Y represents at least one element selected from the group consisting of Sb, As, Cu, Ag, Mg, Zn, Al, B, Ge, Sn, Pb, Ti, Zr, Cr, Re, Bi, W, Fe, Co, Ni, Ce and Th;
• O represents oxygen;
• a to e represents atomic ratios of respective elements, a:
• 0.1≦a≦6.0, b:
• 0.5≦b≦6.0, c:
• 0.1≦c≦10.0, d:
• 0.1≦d≦3.0, e:
• 0≦e≦3, and f is a value other than 0, which is determined depending on oxidation states and atomic ratios of individual elements.