Catalyst for producing propenal with direct oxidation of propylene and method of producing the same

Abstract

The invention relates to a catalyst for producing acrolein through direct oxidation of propylene, which is obtained by kneading, molding, drying and baking a cesium-containing catalyst (I) and a potassium-containing catalyst (II) which are mixed according to the mass percentages of between 10 and 50 percent of the catalyst (I) and to between 50 and 90 percent respectively. The catalysts (I) and (II) are as follows: the catalyst (I) comprises Moa, Wb, Bic, Fed, (Co and / or Ni)e, Sif, Csg, an Ox, while the catalyst (II) comprises Moa, Wb, Bic, Fed, (Co or / and Ni)e, Sif, Kg, and Ox, wherein the subscripts a, b, c, d, e, f, g, and x are atomic numbers of corresponding elements, and a is between 10 and 12, b is between 0 and 2, a plus b is equal to 12, c is between 0.5 and 2, d is between 0.5 and 2, e is between 3 and 6, f is between 1 and 3, g is between 0.01 and 0.3, and x is the summation of oxygen atomic numbers of oxides of the corresponding elements. The one-way conversion rate of the propylene for the catalyst for the propylene is more than or equal to 97 percent, and the one-way yield of the acrolein is more than or equal to 85 percent.

Description

1. Technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to a gas-phase catalytic oxidation catalyst and a preparation method thereof, in particular to a catalyst for the direct oxidation of propylene to produce acrolein and a preparation method thereof. 2. Background technology [0002] The gas-phase catalytic oxidation of propylene has already been industrialized. When the main product is acrolein, acrylic acid is a by-product. In most cases, acrolein is only the first reaction product of the gas-phase two-step catalytic oxidation of propylene to produce acrylic acid. In the above two cases, there is basically no difference as a catalyst for the gas-phase catalytic oxidation of propylene, which is a catalytic system based on Mo-Bi-Co-Fe (or Mo-Bi-Ni-Fe), and all For ingredients containing alkali metals, potassium salts are used. The preparation method of the catalyst mainly adopts the solution mixing precipitation meth...

AI Technical Summary

Problems solved by technology

[0005] However, for the industrial production of acrolein as the main product, it is necessary to further improve the selectivity of acrolein while maintaining the high activity of the catalyst. The results of high acrolein selectivity reported by some foreign patents are only at low space velocity Only the single-tube test results under industrial conditions are really reliable