Preparation method of catalyst for producing maleic anhydride
A catalyst and maleic anhydride technology, applied in the field of catalyst preparation for the production of maleic anhydride, can solve the problems of long preparation time, poor catalytic performance, small specific surface area of VPO catalyst, etc., and achieve the effect of large specific surface area
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Embodiment 1
[0027] Add about 0.22mol of vanadium pentoxide to 1000ml of 20wt% phosphoric acid solution, start stirring and heat the mixed solution to reflux and then reflux for 24h. After the heating and cooling are stopped, the mixed solution is filtered and washed with hot water, and then washed with acetone to obtain a filter cake Dry at 105°C for 12h to get VOPO 4 Precursor A. The resulting precursor A was added to 400ml of ethylene glycol and reacted at 50°C and 80°C for 1 hour respectively. After cooling, it was filtered and washed with acetone. The obtained filter cake was dried at 120°C for 20 hours to obtain precursor B. Precursor B and 400ml of isobutanol were placed in a small autoclave and sealed, heated to 130°C and kept for 6h, the resulting solution was cooled, filtered, washed with isobutanol and dried at 120°C for 20h to obtain a VPO precursor. The VPO precursor was heated to 415 °C for 3 h in an atmosphere of 20% air / 20% nitrogen / 10% carbon dioxide / 50% water vapor by vo...
Embodiment 2
[0031]Add about 0.22mol of vanadium pentoxide to 1000ml of 20wt% phosphoric acid solution, start stirring and heat the mixed solution to reflux and then reflux for 24h. After the heating and cooling are stopped, the mixed solution is filtered and washed with hot water, and then washed with acetone to obtain a filter cake Dry at 105°C for 12h to get VOPO 4 Precursor A. Precursor A was mixed with 300ml 1,4-butanediol and reacted at 50°C and 80°C for 1 hour respectively. After cooling, it was filtered and washed with acetone. The obtained filter cake was dried at 120°C for 20 hours to obtain precursor B. Precursor B and 400ml of isobutanol were placed in a small autoclave and sealed, heated to 130°C and kept for 6h, the resulting solution was cooled, filtered, washed with isobutanol and dried at 120°C for 20h to obtain a VPO precursor. The VPO precursor was heated to 415 °C for 3 h in an atmosphere of 20% air / 20% nitrogen / 10% carbon dioxide / 50% water vapor by volume, and finally...
Embodiment 3
[0033] Add about 0.22mol of vanadium pentoxide to 1000ml of 20wt% phosphoric acid solution, start stirring and heat the mixed solution to reflux and then reflux for 24h. After the heating and cooling are stopped, the mixed solution is filtered and washed with hot water, and then washed with acetone to obtain a filter cake Dry at 105°C for 12h to get VOPO 4 Precursor A. Precursor A was mixed with 400ml of methyl ethyl ketone and reacted at 50°C and 70°C for 1 hour respectively. After cooling, it was filtered and washed with acetone. The obtained filter cake was dried at 120°C for 20 hours to obtain precursor B. Precursor B and 400ml of isobutanol were placed in an autoclave, sealed and heated to 140°C for 6h, cooled, filtered, washed with isobutanol and dried at 120°C for 20h to obtain a VPO precursor. The VPO precursor was heated to 415 °C for 3 h in an atmosphere of 20% air / 20% nitrogen / 10% carbon dioxide / 50% water vapor by volume, and finally in an atmosphere of 40% nitroge...
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