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Method for preparing W/Cr doped MoVTeNbO catalyst

A technology of deionized water and water bath, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problems of low selectivity and low yield of acrylic acid

Inactive Publication Date: 2018-10-16
QIDONG XIANGRUI CONSTR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the selectivity and yield of acrylic acid are still not high, and there is still a long way to go before industrial application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A method for preparing a W / Cr-doped MoVTeNbO catalyst, comprising the steps of: dissolving 40 parts of ammonium heptamolybdate, 12 parts of ammonium metavanadate, and 10 parts of telluric acid in 75 parts of deionized water, in a water bath at 72 ° C Stir for 2.5 hours to obtain a red clear solution A; dissolve 14 parts of niobium oxalate in 40 parts of deionized water, dissolve 5 parts of ammonium tungstate in 30 parts of deionized water, dissolve 3 parts of chromium nitrate in 25 parts of deionized water, and added to solution A in turn, and stirred in a water bath at 34°C for 3.5h, evaporated the water using a rotary evaporator, dried the obtained solid in an oven at 102°C for 12h, first calcined at 240°C for 3h in an air atmosphere, and then at 520°C under nitrogen Calcined under atmosphere for 3.5h, then cooled to get the product; all raw materials are in parts by weight.

Embodiment 2

[0017] A method for preparing a W / Cr-doped MoVTeNbO catalyst, comprising the steps of: dissolving 35 parts of ammonium heptamolybdate, 9 parts of ammonium metavanadate, and 8 parts of telluric acid in 70 parts of deionized water, in a 70°C water bath Stir for 2 hours to obtain a red clear solution A; dissolve 10 parts of niobium oxalate in 35 parts of deionized water, dissolve 4 parts of ammonium tungstate in 25 parts of deionized water, dissolve 2 parts of chromium nitrate in 20 parts of deionized water, and Add to solution A in turn, and stir in a 30°C water bath for 3h, use a rotary evaporator to evaporate the water, and dry the obtained solid in an oven at 100°C for 11h, first calcined at 230°C for 2.5h in an air atmosphere, and then at 510°C in a nitrogen atmosphere Calcined for 3 hours, then cooled to get the product; all raw materials are parts by weight.

Embodiment 3

[0019] A method for preparing a W / Cr-doped MoVTeNbO catalyst, comprising the steps of: dissolving 45 parts of ammonium heptamolybdate, 15 parts of ammonium metavanadate, and 12 parts of telluric acid in 80 parts of deionized water, in a 75°C water bath Stir for 3 hours to obtain a red clear solution A; dissolve 18 parts of niobium oxalate in 45 parts of deionized water, dissolve 6 parts of ammonium tungstate in 35 parts of deionized water, dissolve 4 parts of chromium nitrate in 30 parts of deionized water, and Add to solution A in sequence, and stir in a water bath at 38°C for 4h, evaporate the water using a rotary evaporator, dry the obtained solid in an oven at 105°C for 13h, first calcinate at 250°C for 3.5h in an air atmosphere, and then at 530°C in a nitrogen atmosphere Calcined at lower temperature for 4h, then cooled to obtain the product; all raw materials are in parts by weight.

[0020] The method is simple, quick and easy to operate, and the selectivity and yield o...

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PUM

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Abstract

The present invention discloses a method for preparing a W / Cr doped MoVTeNbO catalyst. The method comprises the following steps: ammonium heptamolybdate, ammonium metavanadate and telluric acid are dissolved in deionized water; the dissolved materials are stirred in a water bath at 70-75 DEG C for 2-3 h to obtain a solution A; niobium oxalate is dissolved in deionized water; ammonium tungstate isdissolved in deionized water; chromium nitrate is dissolved in deionized water; the materials are sequentially added to the solution A to be stirred for 3-4 h; a rotary evaporator is used for evaporating water; obtained solid is dried; the dried solid is firstly calcined at an air atmosphere of 230-250 DEG C for 2.5-3.5 h; then the dried solid is calcined at a nitrogen atmosphere at 510-530 DEG Cfor 3-4 h; and a finished product is obtained by cooling. The prepared catalyst by the method catalyzes propane oxidation reaction with selectivity and yield of acrylic acid better than those of undoped and single doped catalysts.

Description

technical field [0001] The invention relates to a method for preparing a W / Cr doped MoVTeNbO catalyst. Background technique [0002] Acrylic acid (AA), as the simplest unsaturated carboxylic acid, can synthesize a variety of organic compounds, and has been widely used in many fields such as textiles, chemical fibers, plastics, papermaking, and coatings. At present, the two-step oxidation of propylene is the main method for the industrial production of acrylic acid, and its raw material cost is high and the process is complicated. However, propane has a wide range of sources, so the oxidation of propane to acrylic acid has a good development prospect. At present, most of the catalysts used in the research of propane oxidation to acrylic acid are composite metal oxides, and the composite metal oxide MoVTeNbO catalyst shows superior catalytic performance. However, the selectivity and yield of acrylic acid are still not high, and there is still a long way to go before industri...

Claims

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Application Information

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IPC IPC(8): B01J27/057B01J37/08
CPCB01J37/082B01J27/0576
Inventor 不公告发明人
Owner QIDONG XIANGRUI CONSTR CO LTD
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