Preparation method and application of silicon dioxide coating type integral catalyst
A monolithic catalyst and silicon dioxide technology, which is applied in the direction of physical/chemical process catalysts, ketene preparation, chemical instruments and methods, etc., can solve the problems of fast catalyst deactivation rate, poor reaction selectivity, long process, etc., and achieve good results Adsorption effect, small bed pressure drop, high dispersion effect
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Embodiment 1
[0062] The silica-coated monolithic catalyst is prepared by impregnation method, and the specific steps are as follows:
[0063] (1) Weigh 100g of cordierite powder, 15g of hydroxymethyl cellulose, 10g of kaolin, 20g of pore-forming agent graphite, and 50g of water, mix them in a mixer, and mechanically stir for more than 1h to obtain a preliminary mixed coarse mud, kneading into After stripping, move it into a vacuum mud refining machine, practice the mud 3 to 5 times, wrap it into a ball, and freeze and rot for 4 hours to obtain fine mud.
[0064] (2) Pass the fine sludge obtained in step (1) through a piston-type ceramic extruder to obtain extruded ceramic blanks, use a cutting machine to segment the blanks according to the size of the reactor, move them into an oven for drying, and put them into Roasted in a muffle furnace to obtain several cylindrical monolithic honeycomb ceramic carriers with a size of Φ10mm*50mm, 33 small holes and a porosity of 60%.
[0065] (3) Accur...
Embodiment 2～5
[0070] The silicon dioxide-coated monolithic catalyst prepared in Example 1 is loaded into a fixed-bed reactor, and isobutyric acid is used as a raw material, and isobutyric acid and nitrogen are mixed in a volume ratio of 1 / 9 and passed through the cracking process equipped with a catalyst. In the reactor, the pressure is normal pressure, the contact time is 0.30s, and at different cracking temperatures, the reaction results of one-way cracking of isobutyric acid into dimethylketene are shown in Table 1:
[0071] Table 1 The results of the catalytic cracking reaction of isobutyric acid under the contact time of 0.30s
[0072] serial number temperature, ℃ Conversion rate,% DMK selectivity, % DMK yield, % 2 520 55.61 28.14 18.30 3 540 60.70 30.27 18.36 4 560 71.42 32.00 22.85 5 580 76.22 34.75 26.52
Embodiment 6～9
[0074] The silicon dioxide-coated monolithic catalyst prepared in Example 1 is loaded into a fixed-bed reactor, and isobutyric acid is used as a raw material, and isobutyric acid and nitrogen are mixed in a volume ratio of 1 / 9 and passed through the cracking process equipped with a catalyst. In the reactor, the pressure is normal pressure, the contact time is 0.20s, and at different cracking temperatures, the reaction results of one-way cracking of isobutyric acid into dimethylketene are shown in Table 2 below:
[0075] Table 2. The results of the catalytic cracking reaction of isobutyric acid under the contact time of 0.20s
[0076] serial number temperature, ℃ Conversion rate,% DMK selectivity, % DMK yield, % 6 520 46.56 28.22 13.14 7 540 56.34 31.19 17.57 8 560 70.59 44.37 31.32 9 580 74.77 44.67 33.44
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