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Cr-doped catalyst for preparing acrylic acid by catalytically oxidizing propane and preparation method of Cr-doped catalyst

A technology for oxidizing propane and catalysts, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, and the preparation of organic compounds. It can solve the problems of large differences in the yield of acrylic acid, etc., and achieve the effect of convenient operation and simple process

Inactive Publication Date: 2013-09-11
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Among the currently studied catalysts for catalyzing the oxidation of propane to produce acrylic acid, most of them are composite metal oxides, mainly MoVTe(Sb)Nb. However, the yield of acrylic acid produced by MoVTeNb catalysts prepared by different researchers varies greatly. Mitsubishi, Japan The company has reported the development of MoVTeNbO x The yield of the system catalyst reaches 48%, while the yield of acrylic acid reported in China is lower than this level

Method used

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  • Cr-doped catalyst for preparing acrylic acid by catalytically oxidizing propane and preparation method of Cr-doped catalyst
  • Cr-doped catalyst for preparing acrylic acid by catalytically oxidizing propane and preparation method of Cr-doped catalyst
  • Cr-doped catalyst for preparing acrylic acid by catalytically oxidizing propane and preparation method of Cr-doped catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Dissolving-co-precipitation method prepares the catalyst of the present invention:

[0023] Raw materials: Ammonium molybdate: (NH 4 ) 6 Mo 7 o 24 4H 2 o

[0024] Ammonium metavanadate: NH 4 VO 3

[0025] Telluric acid: H 2 TeO 4 h 2 o

[0026] Niobium oxalate: C 12 h 7 NbO 24

[0027] Chromium nitrate: Cr(NO 3 ) 3

[0028] By catalyst (Mo 7.82 V 1.18 Te 0.94 NbO 28.9 ), use 20 ml of distilled water to stir and dissolve the mixture of ammonium molybdate, ammonium metavanadate and telluric acid at 80°C, then add 20 ml of dissolved niobium oxalate solution, and then add a certain proportion of chromium nitrate solution to Evaporate to dryness at 80°C and dry for 12 h. The catalyst can be obtained by calcining at 150°C and 600°C for 2 hours respectively under the protection of nitrogen.

Embodiment 2

[0030] Catalytic reaction performance of catalysts with different Cr content:

[0031] With reference to the method of Example 1, add 3.5310 grams of ammonium molybdate, 0.3530 grams of ammonium metavanadate, 0.5520 grams of telluric acid and 20 ml of water in No. 1 beaker to dissolve it at 80 ° C, and add 1.6063 grams of niobium oxalate in No. 2 beaker and 20 ml of distilled water to dissolve it at 80°C, and add the solution in No. 2 beaker to No. 1 beaker dropwise to form a 4-component mixture. Add 2.557×10 respectively -3 The mol / l chromium nitrate solution is 2 ml, 4 ml, 6 ml, 8 ml and 10 ml, continue to add distilled water to 80 ml, evaporate to dryness at 80°C and dry for 12 h. Then, under the protection of nitrogen, it is baked at 150°C and 600°C for 2 hours respectively, and the composite metal oxide containing multiple components can be prepared.

[0032] Catalytic reaction conditions: propane / oxygen = 1 / 2, reaction temperature is 390°C, under normal ...

Embodiment 3

[0036] Catalytic reaction performance at different reaction temperatures:

[0037] Catalyst preparation: with reference to the method of embodiment 1 and embodiment 2, make the Cr that contains element Cr 0.002 Mo 7.82 V 1.18 Te 0.94 Nb 1 o y Multi-component composite metal oxides.

[0038] Reaction conditions: propane / oxygen = 1 / 2, reaction temperature is 390~420°C, under normal pressure, space velocity is 3197 ml / (g.h), water flow rate is 0.5 ml / h. Water is vaporized through a heating tube at 170°C and mixed with propane and oxygen, and the reaction is carried out in a continuous-feed fixed-bed quartz tube reactor. Catalyst evaluation results are as follows:

[0039] Table 2

[0040]

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Abstract

The invention relates to a modified catalyst for preparing acrylic acid by catalytically oxidizing propane, and in particular relates to a catalyst containing Mo, V, Te and Nb elements as active ingredients and metallic oxide with Cr element properly added, and a preparation method of the catalyst. The modified catalyst for preparing acrylic acid by catalytically oxidizing propane is an unsupported multi-ingredient metallic oxide and adopts the Mo, V, Te and Nb elements as the main active ingredients, and proper Cr element is added; the ingredient content in molar ratio is that CrxMo7.82V1.18Te0.94Nb10y (x ranges from 0 to 0.01). The catalyst is suitably used for preparing acrylic acid by selectively oxidizing propane; no processing is done before reaction, so that the process is simple, and the operation is convenient; the raw gas is basically composed of propane / oxygen at a (volume) ratio of 0.4 to 0.7; and the reaction is carried out at 380 to 420 DEG C at normal pressure along with the inlet flow of 0.3 to 0.65ml / h and air speed of 1,200 to 4,000ml / (g.h).

Description

technical field [0001] The invention relates to a modified catalyst for preparing acrylic acid by catalyzing the oxidation of propane, in particular to a catalyst containing Mo, V, Te, and Nb elements as active components of the catalyst, and a metal oxide catalyst with appropriate addition of Cr element and its preparation method. Background technique [0002] Propane is a low-chain saturated alkane, one of the main components of natural gas, liquefied petroleum gas, and coalbed methane, and is relatively abundant on the earth. However, most of the natural gas resources that have been exploited are mainly used as fuel, while the natural gas resources used for chemical conversion into high value-added compounds are relatively small and have not been fully utilized. Acrylic acid is a class of organic intermediates with a wide range of uses. It is widely used in coatings, chemical fibers, textiles, light industry and other industries. It is mainly used to produce acrylates in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/057C07C57/04C07C51/215
Inventor 陆维敏徐爱新
Owner ZHEJIANG UNIV
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