A vanadium-phosphorus-oxygen catalyst for producing maleic anhydride by n-butane oxidation and its preparation method
A catalyst, vanadium phosphorus oxide technology, applied in physical/chemical process catalysts, chemical instruments and methods, organic chemistry and other directions, can solve problems such as increasing the yield of maleic anhydride, and achieve the effects of improving selectivity, easy implementation and simple process
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Embodiment 1
[0067] Into a 3L round bottom flask add 127.2g of V 2 o 5 A mixed solution of 1350mL isobutanol and 150mL benzyl alcohol was heated and stirred to reflux for 3 hours, 10.0g of polyethylene glycol with a molecular weight of 1500 was added thereto, 150g of phosphoric acid 105wt% was added dropwise and heated and stirred to reflux for 16 hours, The V / P feeding molar ratio is 1 / 1.15, and the resulting precipitate is centrifuged and washed with absolute ethanol and then dried at 120°C for 12 hours. Add the dried catalyst precursor powder to graphite with a mass ratio of 3 / 97 to the catalyst precursor powder, mix well and heat in air at 250°C for 5 hours, and then press the powder into a cylindrical structure with a height of 3mm and a diameter of 6mm object, the density of this structure is 1.2g / cm 3 , the obtained catalyst precursor structure was heated up to 375°C at a heating rate of 2.5°C / min in an air atmosphere, and then the atmosphere was replaced with a mixed atmosphere o...
Embodiment 2
[0071] Into a 3L round bottom flask add 127.2g of V 2 o 5 A mixed solution of 1250mL isobutanol and 250mL benzyl alcohol was heated and stirred to reflux for 3 hours, 20.0g of polyethylene glycol with a molecular weight of 2000 was added thereto, 156g of phosphoric acid 105wt% was added dropwise and heated and stirred to reflux for 20 hours, The V / P feeding molar ratio is 1 / 1.20, and the resulting precipitate is centrifuged and washed with absolute ethanol and then dried at 120°C for 12 hours. Add the dried catalyst precursor powder to graphite with a mass ratio of 3 / 97 to the catalyst precursor powder, mix well and heat in air at 250°C for 5 hours, and then press the powder into a cylindrical structure with a height of 3mm and a diameter of 13mm object, the density of this structure is 1.22g / cm 3 , the obtained catalyst precursor structure was heated up to 375°C at a heating rate of 2.5°C / min in an air atmosphere, and then the atmosphere was replaced with a mixed atmosphere...
Embodiment 3
[0075] Into a 3L round bottom flask add 127.2g of V 2 o 5 A mixed solution of 1250mL isobutanol and 250mL benzyl alcohol was heated and stirred to reflux for 3 hours, 10.0g of polyethylene glycol was added with a molecular weight of 6000, 130g of 105wt% phosphoric acid was added dropwise and heated and stirred to reflux for 10 hours, The V / P feeding molar ratio is 1 / 1, and the resulting precipitate is centrifuged and washed with absolute ethanol and then dried at 120°C for 12 hours. Add the dried catalyst precursor powder to graphite with a mass ratio of 5 / 95 to the catalyst precursor powder, mix well and heat in air at 250°C for 5 hours, and then press the powder into a cylindrical structure with a height of 3mm and a diameter of 6mm object, the density of this structure is 1.12g / cm 3 , the obtained catalyst precursor structure was heated up to 375°C at a heating rate of 2.5°C / min in an air atmosphere, and then the atmosphere was replaced with a mixed atmosphere of 50% wate...
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