Studies On Heteropoly Compound For Catalytic Selecive Oxidation Of Propane

Acrylic Acid (AA) is a very important raw material in organic chemical industry. Selective oxidation of propane to produce AA is an important way to use propane effectively. Compared with the oxidation of propene to produce AA, the material of this way is very rich and inexpensive. It has a potential foreground of industrial applications.Heteropoly compound (HPC) is a kind of excellent versatile catalyst. Using HPC catalyst to oxide selectively propane has become very popular recently. However, most of these studies just focused on the constituent and structure to improve the catalytic activity.This work placed stress on the state of valence, changing the preparation method to prepare partial reduced HPC, and using the partial reduced HPC as catalyst creatively to selective oxidation of propane.The systematic research was proceeded on the HPC and the carriers. It was found that the catalytic activity of the HPC which was prepared from Cu powder, being carried on Si02 (whose pore has been expanded by heat water steam in high-pressure container) as catalyst and in reduced air (fuel-rich condition), is very high. The optimum catalyst is: HPC?Cuo.oCro.6PAso.6MoioV2O~ carrier?Si02 (220 0C).The reaction techniques of selective catalytic oxidation of propane were evaluated. The influences of the reaction temperature, the total space velocity and the content of propane, oxygen, steam, were concerned. The optimum reaction conditions were chosen as following: reaction temperature?900C; total space velocity 500 W? the content of reaction gas?C3H8:02:N2:H20 2:l:5:2 (mol / mol); Under forementioned condition, the conversion of propane is 38%, the yield of AA reached14.8%.A series of characterization of catalysts were carried out, including IR, DTA, SEM, ESR etc.