Method for preparing catalyst carrier used for preparing vinyl acetate by fluidized bed process
A technology of catalyst carrier and vinyl acetate, which is applied in the direction of catalyst activation/preparation, preparation of organic compounds, physical/chemical process catalysts, etc., and can solve the problem of low catalyst selectivity
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Embodiment 1
[0021] (1) carrier preparation
[0022] The specific steps of carrier preparation are:
[0023] a) will contain 5% coarse porous microsphere silica gel (specific surface is 328 meters 2 / gram, pore volume 1.19 milliliters / gram, average pore diameter 14.5 nanometers), 22.5% (calculated as silicon dioxide) silica sol (colloid particle diameter 78 nanometers) and the mixture of 72.5% water wet grinding 12 hours with stirring mill.
[0024] b) The obtained slurry is then subjected to spray granulation with a centrifugal spray dryer under the conditions of an inlet temperature of 310° C., an outlet temperature of 150° C., and an atomization disc rotation speed of 32 Hz.
[0025] c) Calcining the obtained spray-dried product in a muffle furnace at 600° C. for 6 hours. The specific surface of this product is 295 meters 2 / g, the pore volume is 0.76 ml / g, and the average pore diameter is 11.2 nanometers.
[0026] d) 400 grams of roasted product and 3000 grams of aqueous electroly...
Embodiment 2
[0046] (1) carrier preparation
[0047] The operation is carried out according to [Example 1] part (1), and the specific process parameters and results are shown in Table 1 to Table 3.
[0048] (2) Catalyst preparation
[0049] Take 100 g of the carrier, add 72 ml of Na containing 0.86 g of Pd and 0.42 g of Au under stirring 2 PdCl 4 , HAuCl 4Aqueous solution, stirred evenly, left standing for 1 hour, dried at 80° C. for 12 hours, then slowly added to 384 g of 5% hydrazine hydrate aqueous solution under stirring. After adding hydrazine hydrate, let it stand for 12 hours and stir thoroughly every 3 hours. Then filter, the filter cake was washed with deionized water for 12 hours, then dried at 80°C for 12 hours, then added 72 grams of KOAc aqueous solution containing 6.6 grams of KOAc under stirring, stirred evenly, stood for 1 hour, and dried at 60°C for 12 hours. Hours to get the finished catalyst. The weight composition of the catalyst is: Pd 0.791%, Au 0.383%, KAc 6.08...
Embodiment 3
[0057] (1) carrier preparation
[0058] The operation is carried out according to [Example 1] part (1), and the specific process parameters and results are shown in Table 1 to Table 3.
[0059] (2) Catalyst preparation
[0060] Take 100 g of the carrier, add 60 ml of Na containing 1.37 g of Pd and 0.74 g of Au under stirring 2 PdCl 4 , HAuCl 4 Aqueous solution, stirred evenly, left standing for 1 hour, dried at 80° C. for 12 hours, then slowly added to 630 g of 5% hydrazine hydrate aqueous solution under stirring. After adding hydrazine hydrate, let it stand for 12 hours and stir thoroughly every 3 hours. Then filter, wash the filter cake with deionized water for 12 hours, then dry at 80°C for 12 hours, then add 72 grams of KOAc aqueous solution containing 8.8 grams of KOAc under stirring, stir well, let stand for 1 hour, and dry at 60°C for 12 hours Hours to get the finished catalyst. The weight composition of the catalyst is: Pd 1.22%, Au 0.655%, KAc 7.81%.
[0061] F...
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