Silicon-containing aluminium hydroxide and prep. thereof
A technology of aluminum hydroxide and aluminum oxide, which is applied in the field of catalytic base materials and catalyst base materials, can solve the problems of difficult molding, complicated molding process, and poor peptization, so as to improve the deterioration of peptization, reduce the preparation cost, and improve roasting. The effect of temperature
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Embodiment 1
[0021] Set the concentration to 30gAl 2 o 3 / l of sodium metaaluminate solution is placed in the gel-forming tank, the temperature is controlled at 20°C, and the concentration is 20gSiO 2 / l sodium silicate solution, stir evenly, add sodium silicate as SiO 2 The content calculated in the silicon-containing aluminum hydroxide is 2.0% by weight, and the carbon dioxide gas with a concentration of 30v% is introduced until the pH value of the slurry is 11. The carbon dioxide gas is stopped, and the slurry is aged for 0.5hr under stirring, and then carried out Filter, add deionized water to the filter cake and re-pulp and stir, and then add the remaining part of the calculated amount of sodium silicate solution to make the silicon-containing compound with SiO 2 The final content calculated in silicon-containing alumina is 8.0m%, and then aged for 0.5 hours, filtered, and washed 4 times to make the carrier contain Na + <0.05% by weight, dry (110° C.) for 4 hours, and then crush to...
Embodiment 2
[0023] Compared with Example 1, after gelling, filter, the remaining portion of sodium silicate solution after the filter cake is re-beaten is added, so that the silicon-containing compound is replaced by SiO 2 The content calculated in silicon-containing alumina is 12.0m%, and the amount of other materials and operating conditions are the same as in Example 1, namely the cost example.
Embodiment 3
[0025] Compared with Example 1, after gelling, filter, the addition of the remaining part of sodium silicate solution after the filter cake is re-beaten is reduced, so that the silicon-containing compound is replaced by SiO 2 The final content calculated in the silicon-containing alumina is 5.0m%, and the amount of other materials and operating conditions are the same as in Example 1, namely the cost example.
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