Method for preparing V-Ti-Si-O composite catalyst used in methanol oxidation for synthesizing methylal

[0013] 13.52g of titanium sulfate and 0.90g of vanadyl sulfate were ultrasonically dissolved in 450mL of water to obtain a blue solution A, and 35mL of ammonia water (25%) was added to 700mL of water to form an ammonia solution, and the vanadium-titanium solution A was dissolved in 3 mLmin -1 Add it dropwise into the ammonia solution at a high speed. After the addition is complete, continue to stir for 1 hour, age at room temperature for 8 hours, filter, and roast the obtained filter cake in air at 350°C for 3 hours to obtain a solid sample. The vanadium content was determined to be 9.8% (by mass percentage of vanadium pentoxide), the titanium content was 86.4% (by mass percentage of titanium dioxide), and the sulfur was 3.8% (by mass percentage of sulfate). The prepared V 2 o 5 The composite catalyst is crushed and sieved, and the 20-40 mesh sample is taken in a U-shaped tube reactor with an external diameter of 8mm, and the ratio of the amount of the substance is methanol 5...

[0022] 9.62g of titanium sulfate and 1.40g of vanadyl sulfate were ultrasonically dissolved in 350mL of water to obtain a blue solution A. Take 30mL of ammonia water (25%) and add 180mL of water to form an ammonia solution. -1 Add it dropwise into the ammonia solution at a high speed. After the dropwise addition is complete, continue to stir for 3 hours, age at room temperature for 10 hours, filter, and roast the obtained filter cake in air at 400°C for 6 hours to obtain a solid sample. The vanadium content was determined to be 18.9% (by mass percentage of vanadium pentoxide), the titanium content was 79.5% (by mass percentage of titanium dioxide), and the sulfur was 1.6% (by mass percentage of sulfate radical). The prepared V 2 o 5 The composite catalyst is crushed and sieved, and the 20-40 mesh sample is taken in a U-shaped tube reactor with an external diameter of 8mm, and the ratio of the amount of the substance is methanol 5%, O 2 15%, N 2 80% of the mixed gas was pr...

[0024] 7.21g of titanium sulfate and 2.87g of vanadyl sulfate were ultrasonically dissolved in 370mL of water to obtain a blue solution A. Take 30mL of ammonia water (25%) and add 180mL of water to make an ammonia solution. The vanadium-titanium solution A was dissolved in 4 mL min -1 Add it dropwise into the ammonia solution at a high speed. After the dropwise addition is complete, continue to stir for 5 hours, age at room temperature for 10 hours, filter, and roast the obtained filter cake in air at 400°C for 6 hours to obtain a solid sample. The vanadium content was determined to be 38.9% (by mass percentage of vanadium pentoxide), the titanium content was 59.8% (by mass percentage of titanium dioxide), and the sulfur was 1.3% (by mass percentage of sulfate). The prepared V 2 o 5 The composite catalyst is crushed and sieved, and the 20-40 mesh sample is taken in a U-shaped tube reactor with an external diameter of 8mm, and the ratio of the amount of the substance is methan...