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V-P-In composite oxide catalyst precursor and preparation method and application thereof
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A composite oxide and catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc. The issue of low selectivity
Inactive Publication Date: 2019-06-25
BEIJING HUAI YING MALEIC ANHYDRIDE SCI & TECH CO LTD
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The composition of this catalyst is complex, but the catalytic activity and selectivity are not high
[0008] CN1303741A discloses a preparation method of a composite vanadium-phosphorus-oxygen catalyst for producing maleic anhydride by n-butane oxidation, the method is to increase the available oxygen amount of the catalyst system by adding an oxygen storage body ceria-based composite oxide to the VPO catalyst , the composition of the catalyst prepared by this method is complex, and expensive rare earth oxides are added
[0012] As mentioned above, there are also shortcomings such as maleic anhydride yield and selectivity and stability are not high, and the preparation process is long in the catalyst for producing maleic anhydride prepared by the method of the prior art
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[0030] A second aspect of the present invention provides a method for preparing a catalyst precursor, wherein the method comprises the following steps:
[0031] (1) carry out reduction reaction with pentavalent vanadium compound and alcohol;
[0032] (2) carrying out the first reaction with the reduction product of step (1) and the organic indium compound;
[0033] (3) carrying out the second reaction with the product of step (2) and phosphorus oxyacid;
[0034] (4) The product of step (3) is cooled, filtered, washed and dried.
[0035] According to the preparation method of the present invention, the alcohol can be isobutanol and / or benzyl alcohol; preferably a mixed alcohol of isobutanol and benzyl alcohol, and the volume ratio of isobutanol and benzyl alcohol can be (2-12):1; Preferably, the volume ratio of isobutanol to benzyl alcohol is (2.5-10):1; more preferably, the volume ratio of isobutanol to benzyl alcohol is (2.5-5):1.
[0049] This example is to illustrate the catalyst precursor prepared by the method of the present invention.
[0050] (1) In a 2-liter glass reactor that is provided with a heater, a mechanical stirrer and a condenser, under a stirring condition of 300 rpm at a stirring speed, add 980 milliliters of isobutanol and 200 milliliters of benzyl alcohol (wherein , the volume ratio of the two is 4.9), then add 60 grams of vanadium pentoxide (vanadium pentoxide V 2 o 5 The molecular weight is 182, after calculation, is equivalent to the vanadium of 0.6594mol), reflux heating 1 hour.
[0051] (2) 5.5 grams of indium acetate (indium acetate hydrate C 6 h 11 InO 7 The molecular weight is 309.97, after calculation, 12 grams of solution equivalent to 0.017mol of indium) is added in the product of step (1) at one time, and heated under reflux for 2 hours.
[0052] (3) 82 grams of 100% phosphoric acid (the molecular weight of phosphoric acid is 97.994, calculated to be equivalent to 0.8...
Embodiment 2
[0057] Except not adding organic indium compound, other is identical with embodiment 1, obtains about 110 grams of products.
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Abstract
The invention relates to the field of preparing maleic anhydride catalysts, and discloses a V-P-In composite oxide catalyst precursor and a preparation method and application thereof, the pore diameter distribution of the V-P-In composite oxide catalyst precursor is: pores larger than 100 angstrom accounts for 85% or more, pores smaller than 100 angstrom accounts for 15% or less, and the crystal particle size of the catalyst precursor is 35-50 microns. By adopting the preparation method, the catalyst precursor has relatively small crystal particle size, large specific surface area and large bulk density under the condition of proper pore size distribution.
Description
technical field [0001] The present invention relates to the field of preparing maleic anhydride (abbreviated as maleic anhydride, commonly known as maleic anhydride) catalyst, more specifically, the present invention relates to a V-P-In composite oxide catalyst precursor and its preparation method and application, especially The invention relates to a fixed-bed or fluidized-bedsolidvanadium-phosphorus-indium composite oxide catalyst precursor for preparing maleic anhydride and a preparation method thereof. Background technique [0002] Maleic anhydride is an important organic chemical raw material, which is widely used in the production of thermosetting resins, unsaturated polyester resins, pesticides and fine chemical products. Previously, maleic anhydride was produced from benzene. Due to the toxicity, unsafety and environmental hazards of benzene, butene was used instead of benzene as raw material to produce maleic anhydride, and a device for producing maleic anhydride...
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