(Meth)acrolein oxidation catalyst and preparation method thereof

A heteropolyacid catalyst for preparing (meth)acrylic acid by oxidation of (meth)acrolein, wherein the catalyst has a composition represented by the following formula:

• x(Mo12PaCsbVcDeOf)+tC/yZ
• wherein Mo12PaCsbVcDeOf is a primary catalyst of heteropolyacid salt, C is a nanocarbon fiber additive, and Z is a support/heat conducting diluent;
• Mo, P, Cs, V and O represent elements of molybdenum, phosphorus, cesium, vanadium and oxygen respectively;
• D represents at least one element selected from the group consisting of copper, iron, magnesium, manganese, antimony, zinc, tungsten, silicon, nickel, and palladium;
• Z is selected from the group consisting of SiC, SiO2, MoO3, WO3, TiO2, and mixtures thereof in any ratios;
• a, b, c, e, and f represent the atomic proportions of the elements, wherein a=0.1-3, b=0.01-3, c=0.01-5, e=0.01-2, and f is an atomic proportion of oxygen needed to satisfy the valences of the above components;
• x, y represent the weights of the primary catalyst and the support/heat-conducting diluent Z, wherein y/x=11.1-50%;
• t represents a weight of the nanocarbon fiber, t/x=3-10%;
• and
• wherein the nanocarbon fiber has a diameter between 50-200 nm.