The synthesis of chromia - Pillared layered molybdenum trioxide

The first chromia-pillared layered molybdenum trioxide was synthesized by t he ion-exchange reaction of the layered hydrated sodium molybdenum oxide br onze with chromium(III) acetate [Cr(OAc)(3)] aqueous solution and subsequen t calcination of the resultant solid product at 350 degrees C. The obtained chromia-pillared molybdenum oxides were porous layered materials with high specific surface area. The products were characterized by XRD, TEM, DTA an d BET. The influences of the different calcination atmospheres at 350 degre es C on the interlayer distance, the specific surface area and the pore siz e of the resulting product are also discussed. It was found that the obtain ed materials possess the same interlayer distance (d = 1.092nm) and differe nt BET specific surface areas under defferent calcination conditions. Among them, the product calcined in a now of V(O-2)/V(N-2 + O-2) = 4% had the gr eatest specific surface area of 82.4m(2).g(-1) and an average pore diameter of 6.42nm.