Catalyst for preparing propylene through olefin disproportionation
A technology for olefin disproportionation and catalysts, applied in physical/chemical process catalysts, molecular sieve catalysts, organic chemistry, etc., can solve problems such as low catalytic activity and low reaction space velocity, and achieve improved diffusion performance, increased specific surface area, and increased dispersion Effect
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Embodiment 1
[0032] Synthesis of all-silicon MCM-48
[0033] Weigh 10 g of CTAB, dissolve 4.5 g of sodium hydroxide in 286 ml of deionized water, stir at room temperature until clear, and obtain solution A. 47.24 ml of TEOS was slowly added dropwise to A, and vigorously stirred at 30° C. for 1 hour to obtain milky white suspension B. Pour gel B into a stainless steel kettle with a Teflon liner and let it stand in an oven at 100°C for 24 hours. The obtained solid-liquid mixture was suction-filtered, washed with deionized water until neutral, and dried overnight in an oven at 80°C to obtain a synthetic sample.
Embodiment 2
[0035] Direct Synthesis of WOx / MCM-48
[0036] 3.10 g of CTAB and 1.111 g of sodium hydroxide were dissolved in 47 mL of deionized water to obtain a clear solution A. Weigh 8.333 g of 40% (weight) silica sol, slowly drop it into A, stir at 30°C for 5 minutes, then add 1.20 g of ammonium metatungstate, stir vigorously for 1 hour, and obtain white suspension B. Pour gel B into a stainless steel kettle with a Teflon liner and let it stand in an oven at 100°C for 24 hours. The obtained solid-liquid mixture was suction-filtered, washed with deionized water until neutral, and dried overnight in an oven at 80°C to obtain a synthetic sample. Its tungsten content is 12% by weight.
Embodiment 3
[0038] Direct Synthesis of WOx / MCM-48
[0039]3.10 g of CTAB and 1.111 g of sodium hydroxide were dissolved in 47 mL of deionized water to obtain a clear solution A. Weigh 8.333 g of 40% silica sol, slowly drop it into A, stir at 30°C for 5 minutes, then add 0.80 g of ammonium metatungstate, stir vigorously for 1 hour, and obtain white suspension B. Pour the suspension B into a stainless steel kettle with a polytetrafluoroethylene liner, and let it stand in an oven at 100°C for 24 hours. The obtained solid-liquid mixture was suction-filtered, washed with deionized water until neutral, and dried overnight in an oven at 80°C to obtain a synthetic sample. Its tungsten content is 8%.
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