Method for preparing catalyst for alkane ammonia oxidation reaction

A technology of oxidation reaction and catalyst, which is applied in the direction of hydrocarbon ammoxidation preparation, catalyst activation/preparation, physical/chemical process catalyst, etc. It can solve the problems of poor catalyst stability, complex preparation process, Te volatile, etc., and achieve good results , good repeatability and excellent performance

Active Publication Date: 2012-08-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The technical problem to be solved by the present invention is to overcome problems such as complex preparation process and low yield caused by reflux of Sb in the prior art literature, and poor catalyst stability caused by Te being volatile, and to provide a catalyst for the alkane ammoxidation reaction. Preparation

Method used

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  • Method for preparing catalyst for alkane ammonia oxidation reaction
  • Method for preparing catalyst for alkane ammonia oxidation reaction
  • Method for preparing catalyst for alkane ammonia oxidation reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 72.1 grams of ammonium heptamolybdate and 23.6 grams of telluric acid are dissolved in 300.0 grams of hot water to make solution (I); 16.2 grams of ammonium metavanadate are dissolved in 333.0 grams of hot water to make solution (II); 30.6 grams of niobium oxalate was dissolved in 85.0 grams of hot water to make solution (III); 11.6 grams of oxalic acid was dissolved in 20.0 grams of water to make solution (IV). Solution (I) is joined in solution (II) under stirring, then add solution (III) and solution (IV) successively, finally add 250 grams of silica sols that weight concentration is 40%, make the slurry of catalyst, will The slurry was stirred and evaporated to a solid content of 33%, then spray-dried at an inlet temperature of 350°C, and roasted in a nitrogen atmosphere at 600°C for 2 hours to obtain a propane ammoxidation catalyst of 50% Mo 1 V 0.34 Nb 0.24 Te 0.25 o x +50% SiO2 2 After tableting, 20-40 meshes were taken for fixed-bed microreflective evaluati...

Embodiment 2～6 and comparative example 2～3

[0050] 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 with the prepared catalyst under the following reaction conditions. The specific changes and results are shown in Table 1.

[0051] The reaction conditions of above-mentioned embodiment and comparative example are:

[0052] Fixed bed reactor with an inner diameter of 8 mm

[0053] Reaction temperature 400°C

[0054] Reaction pressure Atmospheric pressure

[0055] Catalyst loading 2.0 grams

[0056] Catalyst contact time 1.2 g·s / ml

[0057] Raw material ratio (mole) propane / ammonia / air=1 / 1.2 / 10

[0058] Table 1

[0059]

Example

Catalyst composition

Preparation key steps

propane

Conversion rate%

Acrylonitrile

selectivity%

Example 1

50%Mo 1 V 0.34 Nb 0.24 Te 0.25 o x +50% SiO2 2

Spr...

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Abstract

The invention relates to a method for preparing a catalyst for alkane ammonia oxidation reaction, which mainly solves the problems that the catalyst is formed nonuniformly, Te is volatile, the preparation technology is complex, the preparation environment is unstable, and active ingredients of the catalyst are volatile so as to cause low stability of the catalyst. A Mo-V-Nb-Te or Sb base is takenas a main component of the catalyst, and the catalyst comprises a silicon dioxide carrier and a composition with a general formula of MoVaNbbCcDdOx in an atomic ratio, wherein C is at least one of Teor Sb, and D is one of Sn, Ti, Fe, Bi, Al or W. A spray drying method is adopted, and the problems are solved by a technical scheme that a reducing agent is added in the preparation process to changethe preparation environment, namely corresponding salt or oxides of Mo, Te or Sb are dissolved, solution of corresponding salt or oxides of V and Nb is respectively added, a needed amount of reducingagent is added to regulate an oxidation state, and a needed amount of silica sol is added for performing spray drying. The method can be applied to industrial production of preparing unsaturated nitriles by alkane ammonia oxidation.

Description

technical field [0001] The invention relates to a preparation method of an alkane ammoxidation reaction catalyst. In particular, it relates to a method for preparing a catalyst for producing acrylonitrile by ammoxidation of propane or a catalyst for producing methacrylonitrile by ammoxidation of isobutane. 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 deepening of the 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 improve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/057B01J23/31B01J23/28B01J37/16B01J37/08C07C253/24C07C255/08
CPCY02P20/52
Inventor 张顺海缪晓春汪国军吴粮华
Owner CHINA PETROLEUM & CHEM CORP
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