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Tellurium containing alkane ammoxidation reaction catalyst

An oxidation reaction and catalyst technology, which is applied in the field of catalysts for propane ammoxidation to acrylonitrile and isobutane ammoxidation to methacrylonitrile, can solve the problems of poor catalyst stability, complicated preparation process, and low yield. Achieve the effect of good catalyst stability, good repeatability and easy access to raw materials

Active Publication Date: 2008-11-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The technical problem to be solved by the present invention is to overcome the problems of complex preparation process and low yield caused by reflux of Sb in the above-mentioned documents, and poor catalyst stability caused by Te being volatile, and to provide a new alkane ammoxidation containing tellurium Catalyst for the reaction

Method used

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  • Tellurium containing alkane ammoxidation reaction catalyst
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  • Tellurium containing alkane ammoxidation reaction catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043]15.0 grams of ammonium heptamolybdate and 4.46 grams of telluric acid are dissolved in 69.2 grams of hot water to make solution (I); 3.06 grams of ammonium metavanadate are dissolved in 60.0 grams of hot water to make solution (II); 5.78 grams of niobium oxalate are dissolved in 16.0 grams of hot water to make solution (III); 2.32 grams of oxalic acid are dissolved in 5 grams of water to make solution (IV); 1ml 98% vitriol oil is dissolved in 9 grams of water to make solution ( V). Solution (I), solution (II), solution (III) are mixed under stirring, then add solution (IV), solution (V) and 50 grams of concentration by weight and be 40% silica sol, make the slurry of catalyst, Then put the slurry into the crystallization kettle, crystallize at 175°C for 48 hours, take it out after the end, stir and evaporate at 90°C to obtain a viscous slurry, then dry, grind, and roast in a nitrogen atmosphere at 600°C for 2 hours, you can get Propane Ammoxidation Catalyst 50% Mo 1 V ...

Embodiment 2～6 and comparative example 2～3

[0047] Catalysts with different compositions in the following table were prepared by the same method as in Example 1, and the ammoxidation of propane to acrylonitrile was carried out under the following reaction conditions with the prepared catalyst. See Table 1 for specific changes and results.

[0048] The reaction conditions of above-mentioned embodiment and comparative example are:

[0049] Fixed bed reactor with an inner diameter of 8 mm

[0050] Reaction temperature 405°C

[0051] Reaction pressure Atmospheric pressure

[0052] Catalyst loading 2.0 grams

[0053] Catalyst contact time 1.2 g·s / ml

[0054] Raw material ratio (mole) propane / ammonia / air=1 / 1.2 / 10

[0055] Table 1

[0056]

Embodiment 6

[0057] The stability evaluation results of Example 6 and Comparative Example 1 are shown in Table 2.

[0058] Table 2

[0059]

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PUM

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Abstract

The invention relates to an oxidation reaction catalyst of telluriferous alkane ammonia, which comprises a silicon dioxide carrier and a combination which is calculated according to the atomic ratio and comprises the following general formula: MovaNbbTecDdOx, wherein D is at least one selected form Sn, Ti, Fe, Bi, Sb or W. The oxidation reaction catalyst mainly solves the problems that Te is easy to volatilize, the preparation technology is complex, the preparation environment is unstable, and the active component of the catalyst is easy to volatilize, thereby resulting in bad stability of the catalyst in the prior art; and the oxidation reaction catalyst better solves the problems through adopting the technical proposal that Mo-V-Nb-Te base is used as the main component, the hydrothermal synthesis method is adopted, the preparation environment is changed through adding reducing agent and acid during the preparation process, that is, firstly the solution of the corresponding salt or the corresponding oxide compound of Mo and Te is mixed with the solution of the corresponding salt or the corresponding oxide compound of V and Nb, then a specified volume of reducing agent and acid are added to adjust the pH value, and hydrothermal treatment is performed to the uniformly mixed solution. The catalyst has the advantages that the catalyst has good oxidation reduction stability, the reaction temperature is low, the reaction product is clean, and high yield coefficient can be kept for a long time, and the catalyst can be applied to the industrial production for the preparation of the unsaturated acid nitrile in the alkane ammonia oxidation reaction.

Description

technical field [0001] The invention relates to a tellurium-containing alkane ammoxidation catalyst. Especially catalysts for the ammoxidation of propane to acrylonitrile and the ammoxidation of isobutane to methacrylonitrile. Background technique [0002] Although most of the production of acrylonitrile currently adopts the propylene ammoxidation process of BP / Sohio, with the changes in the petrochemical market and the in-depth research on the selective oxidation of alkanes, due to the price difference between propane and propylene or the price of isobutane and isobutene The process route of producing acrylonitrile by propane ammoxidation or isobutane ammoxidation to methacrylonitrile has been paid more and more attention. [0003] In order to obtain a catalyst with high activity and high selectivity for the ammoxidation of propane to acrylonitrile, people have made a series of improvements through continuous exploration. Early attempts to develop an efficient process for...

Claims

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Application Information

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IPC IPC(8): B01J27/057C07C253/24C07C255/03
Inventor 张顺海汪国军吴粮华
Owner CHINA PETROLEUM & CHEM CORP
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