Preparation method of chromium oxide-aluminum oxide catalyst

Abstract

The invention discloses a preparation method of a dichromium trioxide-aluminum trioxide catalyst, which comprises the following steps: (1) mixing chromium trioxide and potassium carbonate and adding them into deionized water to obtain a mixture of chromium trioxide-potassium carbonate Solution, ultrasonically dispersed for 30min, cooled naturally to room temperature to obtain mixed solution A; (2) Soak γ-Al2O3 in mixed solution A, and then react in a microwave reactor; (3) The product of step (2) was heated at 3000rpmm Stir the reaction for 30-60min at a certain speed, then ultrasonically disperse for 10-20min, and then repeat this step 3 times; (4) The product of step (3) is left to stand at 50-80°C for 5-8h, and then dried, Finally, it is calcined in a muffle furnace. The present invention prepares the dichromium trioxide-aluminum trioxide catalyst through a microwave method, and has good dehydrogenation catalytic performance, large specific surface area, good selectivity, good wear resistance and good stability.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a preparation method of a dichromium trioxide-aluminum trioxide catalyst. Background technique [0002] Catalyst Cr 2 o 3 / Al 2 o 3 It is the mainstream catalyst for alkane dehydrogenation process in the world, industrialized Cr 2 o 3 / Al 2 o 3 Catalysts mainly include two categories: one is a spherical catalyst suitable for fixed bed dehydrogenation, such as the Catofin process for dehydrogenation of isobutane and propane, and the Catadiene process for one-step dehydrogenation of n-butane; the other is suitable for fluidized Bed dehydrogenation of microsphere catalysts, such as isobutane, isopentane and propane dehydrogenation of Yarsintez process. Most of Russia's alkane dehydrogenation process uses fluidized bed dehydrogenation equipment, and the catalyst is Cr 2 o 3 / Al 2 o 3 Microspheres. The development of isobutane fluidized bed dehydrogenation c...

AI Technical Summary

Problems solved by technology

[0003] But it also has disadvantages. Since the catalyst is always in a fluidized state during the whole process, it is easy to collide and rub against the wall of the vessel, which will cause wear and tear and cause a certain degree of catalyst loss.