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 a

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0042] [Example 1]

[0043]Dissolve 15.0 g of ammonium heptamolybdate and 4.46 g of telluric acid in 69.2 g of hot water to prepare solution (I); dissolve 3.06 g of ammonium metavanadate in 60.0 g of hot water to prepare solution (II); 5.78 grams of niobium oxalate was dissolved in 16.0 grams of hot water to make solution (III); 2.32 grams of oxalic acid was dissolved in 5 grams of water to make solution (IV); 1ml of 98% concentrated sulfuric acid was dissolved in 9 grams of water to make solution ( V). Mix solution (I), solution (II), and solution (III) under stirring, and then add solution (IV), solution (V) and 50 grams of silica sol with a weight concentration of 40% to prepare a catalyst slurry. Then put the slurry into the crystallization kettle and crystallize at 175°C for 48 hours. After the completion, take it out and stir and evaporate at 90°C to obtain a viscous slurry, then dry, grind, and calcinate in a nitrogen atmosphere at 600°C for 2 hours. Propane ammoxidation ca...

Example

[0046] [Examples 2 to 6 and Comparative Examples 2 to 3]

[0047] The catalysts with different compositions in the following table were prepared by basically the same method as in Example 1, and the prepared catalyst was used to carry out the reaction of propane ammoxidation to acrylonitrile under the following reaction conditions. The specific changes and results are shown in Table 1.

[0048] The reaction conditions of the above examples and comparative examples are:

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

[0050] Reaction temperature 405℃

[0051] Reaction pressure atmospheric pressure

[0052] Catalyst loading volume 2.0g

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

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

[0055] Table 1

[0056]

Example Embodiment

[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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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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