A kind of vanadium-phosphorus-oxygen catalyst for butane oxidation to maleic anhydride and preparation method thereof
A technology of vanadium phosphorus oxide and catalyst, which is applied in physical/chemical process catalysts, chemical instruments and methods, organic chemistry, etc. It can solve the problems of uneven grain size distribution, insufficient concentration of particle size distribution, and increased catalyst manufacturing costs. Achieve the effects of concentrated grain size distribution, uniform active center distribution, and regular crystal phase structure
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[0048] (2) Preparation of vanadium phosphorus oxygen catalyst
[0049] Step (1) The obtained vanadium phosphorus oxide is first formed to obtain a vanadium phosphorus oxygen catalyst intermediate, and then activated; or the obtained vanadium phosphorus oxide is first activated to obtain a vanadium phosphorus oxygen catalyst intermediate, and then formed to obtain vanadium phosphorus oxygen catalyst.
[0050] The shape of the obtained vanadium-phosphorus-oxygen catalyst can be shapes such as pressed sheet, sphere, extruded bar, and the phase of matter of the catalyst is mainly super vanadyl phosphate ((VO 2 ) 2 P 2 o 7 )Mutually.
[0051] The above-mentioned molding process generally includes: adding vanadium phosphorus oxide powder (or activated vanadium phosphorus catalyst intermediate) to graphite powder with a mass fraction of 3% to 5%, after mixing thoroughly, using a rotary tablet press, Properly adjust the impact strength, extrude into a certain shape, such as colum...
Embodiment 1
[0058] exist figure 1 In the impingement flow reactor shown, add isobutanol, benzyl alcohol mixture 500mL, isobutanol / benzyl alcohol volume ratio 10:1, silane coupling agent A-147 0.29g, start the impingement flow reactor, make stirring The rotation speed of the paddle reaches 1500r / min, and the reaction liquid passes through the guide tube to form an impingement flow. Raise the reaction temperature and keep it at 110±2°C, mix 29.53g of vanadium pentoxide and 149mL of isobutanol and benzyl alcohol in a FSH-2 high-speed homogenizer to form a suspension, so that the concentration of 85% Phosphoric acid 44.7g and the above-mentioned suspension were added into the reactor from two inlets of the impingement flow reactor at a certain flow acceleration rate, and the reaction time was maintained for 6 hours to complete the reaction. After the reaction solution was cooled to room temperature, it was vacuum filtered, and the filter cake was rinsed three times with a small amount of iso...
Embodiment 2
[0062] exist figure 1 In the impingement flow reactor shown, add 500mL of isobutanol and benzyl alcohol mixture, the volume ratio of isobutanol / benzyl alcohol is 15:1, 0.29g of silane coupling agent A-151, and 0.3g of ferric nitrate hexahydrate , zirconium nitrate 0.5g, start the impingement flow reactor, so that the rotation speed of the stirring blade reaches 2500r / min, and the reaction liquid passes through the guide tube to form an impingement flow. Raise the reaction temperature and keep it at 100±2°C, mix 29.53g of vanadium pentoxide and 149mL of isobutanol and benzyl alcohol in a FSH-2 high-speed homogenizer to form a suspension, so that the concentration of 100% Phosphoric acid 34.98g and the above-mentioned suspension were added into the reactor from two inlets of the impingement flow reactor at a certain flow acceleration rate, and the reaction time was maintained for 6 hours to complete the reaction. After the reaction solution was cooled to room temperature, it wa...
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