Modified alumina composition and preparation thereof
A technology of alumina and composition, which is applied in the field of silica-modified alumina composition and its preparation, can solve the problems of poor isomerization selectivity of straight-chain hydrocarbons, etc., reduce olefin content, promote isomerization reaction, The effect of increasing content
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Embodiment 1
[0028] The silica modified alumina composition provided by the invention is prepared.
[0029] 500 g deionized water and 506.5 g AlCl 3 ·6H 2 16.1 grams of water glass solution (Shandong Aluminum Factory, SiO 2 content is 20.6%), reacted at room temperature for 30 minutes, then added dropwise 1:1 ammonia water (Beijing Chemical Plant, analytically pure) to adjust the pH value until a gel was formed, and its pH value was 4.5, and continued to stir and heat up to 65°C , stop stirring and age for 1 hour, vacuum filter. The filter cake was reslurried with decationized water at 60°C for 30 minutes and vacuum filtered. So repeated washing 3 times, to obtain the modified composition M 1 . Its chemical composition, physicochemical properties and surface acidity measured by pyridine adsorption infrared spectroscopy are listed in Table 1.
Embodiment 2
[0031] Preparation of the silica-modified alumina composition provided by the invention.
[0032] 500 g deionized water and 475.2 g AlCl 3 ·6H 2 Slowly add 48.2 grams of water glass solution dropwise to the solution of O, react at room temperature for 25 minutes, then add dropwise 1:1 ammonia water to adjust the pH value until a gel is formed, and its pH value is 4.8, continue to stir and heat up to 60°C , stop stirring and age for 1.5 hours, vacuum filter. The filter cake was reslurried with 70°C decationized water for 25 minutes and vacuum filtered. So repeated washing 3 times, to obtain the modified composition M 2 . Its chemical composition, physicochemical properties and surface acidity measured by pyridine adsorption infrared spectroscopy are listed in Table 1.
Embodiment 3
[0034] Preparation of the silica-modified alumina composition provided by the invention.
[0035] 500 grams of deionized water and 454.5 grams of AlCl 3 ·6H 2 Slowly add 69.6 grams of water glass solution to the solution of O, react at room temperature for 30 minutes, then add dropwise 1:1 ammonia water to adjust the pH value until a gel is formed, and its pH value is 5.5, continue to stir and heat up to 70°C , stop stirring and age for 1.5 hours, vacuum filter. The filter cake was reslurried with 65°C decationized water for 30 minutes and then vacuum filtered. So repeated washing 3 times, to obtain the modified composition M 3 . Its chemical composition, physicochemical properties and surface acidity measured by pyridine adsorption infrared spectroscopy are listed in Table 1.
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