| 摘要 |
The present invention relates to a new fluidized-bed catalyst used in a process of propylene ammoxidation to acrylonitrile. The catalyst comprises a silica as carrier and a composition represented by the following general formulas:WhereinA represents at least one element selected from a group consisting Li,K,Rb,Cs,Sm, In or Tl;B represents at least one element selected from a group consisting of P, Sb, Cr, W. Pr, Ce, As, B, Te, Ga, Al, Nb, Th, La or V;C represents one element selected from a group consisting of Ni, Co, Sr, Mn, Mg, Ca, Zn, Cd or Cu and the mixture thereof;a is a number of from 0.01 to 1.5;b is a number of from 0.01 to 3.0;c is a number of from 0.1 to 12.0; preferably from 2 to 10;d is a number of from 0.01 to 2.0; preferably from 0.01 to 1.0;e is a number of from 0.01 to 0.7; preferably from 0.05 to 0.5;f is a number of from 0.1 to 8; preferably from 1.0 to 3.0;g is a number of from 0.01 to 6; preferably from 0.1 to 2.0;h is a number of from 12 to 14.5;X denotes the number of oxygen atoms which satisfies the valence requirement of the other elements in the catalyst;The content of silica used as carrier is, 30-70 wt %.The catalyst of the invention can be used in the reaction for propylene ammoxidation to acrylonitrile operated at a higher reaction pressure and higher load condition, and can still sustain a high once-through yield of acrylonitrile. |
