Composite metal oxide catalyst and preparation method thereof
A composite oxide and composite metal technology, which is applied in the field of preparation of the composite metal oxide catalyst, can solve the problems of loss of active components, difficulty in accurately controlling the catalyst, uneven distribution of catalyst active components, etc.
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[0042] Therefore, the preparation method of the present invention includes: prefabricating a part of the composite oxide of molybdenum-bismuth two elements, and then preparing the remaining composite oxide (the remaining composite oxide may optionally contain molybdenum and bismuth elements in the remainder part) , the pre-made molybdenum-bismuth composite oxide was added in a stoichiometric amount.
[0043] In an example of the present invention, based on the respective total moles of molybdenum and bismuth elements, in the pre-prepared molybdenum-bismuth two-element composite oxide, the amount of each element accounts for 40-100% of the total amount respectively, It is preferably 50-98%, more preferably 60-95%, preferably 70-93%, most preferably 80-90%, preferably 85-88%.
[0044] The molybdenum-bismuth composite oxide catalyst finally prepared by the above method has the required molybdenum-bismuth composite oxide structure, so that the final composite oxide catalyst has th...
Embodiment 1
[0101] (i) Preparation of catalyst
[0102] Weigh 15.9 g of ammonium heptamolybdate and dissolve it in 50 mL of distilled water. Then weigh 29.1 grams of bismuth nitrate, dissolve it in 100 mL of distilled water and add a few drops of nitric acid to promote the dissolution of bismuth nitrate. While stirring, the bismuth nitrate solution was slowly added to the ammonium heptamolybdate solution, and ammonia water (concentration about 7 mol / L) was added dropwise at the same time to control the final value of the solution to 1.0. After the dropwise addition, the slurry was aged at 60° C. with stirring for 1 hour, then suction-filtered, and washed with distilled water until the filtrate was neutral.
[0103] Dry the filter cake in an oven at 110°C for 8 hours, and then roast it in an air atmosphere for 5 hours at a roasting temperature of 550°C to obtain a solid substance whose crystal phase is α-bismuth molybdate, and crush it into a powder with a particle size of less than 200 m...
Embodiment 2
[0110] (i) Preparation of catalyst
[0111] Weigh 10.6 g of ammonium heptamolybdate and dissolve it in 30 mL of distilled water. Then weigh 29.1 grams of bismuth nitrate, dissolve it in 100 mL of distilled water and add a few drops of nitric acid to promote the dissolution of bismuth nitrate. While stirring, the bismuth nitrate solution was slowly added to the ammonium heptamolybdate solution, and ammonia water (concentration about 7 mol / L) was added dropwise at the same time to control the final value of the solution to 1.0. After the dropwise addition, the slurry was aged at 60° C. with stirring for 1 hour, then suction-filtered, and washed with distilled water until the filtrate was neutral.
[0112] Dry the filter cake in an oven at 110°C for 8 hours, and then roast it in an air atmosphere for 5 hours at a roasting temperature of 600°C to obtain a solid substance whose crystal phase is β-bismuth molybdate, and crush it into a powder with a particle size of less than 200 m...
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Abstract
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