Method for preparing catalyst carrier for prodn. of propylene by disproportionation of butylene
A catalyst support and disproportionation technology, which is applied in the direction of catalyst support, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of ethylene space velocity consumption and low propylene yield, and achieve the goal of improving selectivity and stability Effect
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Embodiment 1
[0022] Accurately weigh 12.05 grams of ammonium metatungstate (A.R. grade, WO 3 The weight content is 83%), add the same volume of deionized water as the silica gel, and stir until completely dissolved. Take by weighing 100 grams of silica gel (15 orders, specific surface area is 478 meters) 2 / g, SiO 2 The weight content is 80%) and put into a roasting furnace for roasting. The silica gel is roasted at 550° C. for 2 hours in nitrogen before use, and then treated with ammonia water with a pH value of 8.5 at 110° C. for 2 hours.
[0023] Pour the above-mentioned ammonium metatungstate solution into a beaker equipped with silica gel, add the ammonium metatungstate solution while stirring, and then put it in an oven at 120°C to dry overnight. The above prepared sample was placed in a muffle furnace and calcined at 550°C for 10 hours, and the obtained butene disproportionation reaction catalyst WO 3 / SiO 2 , where WO 3 The loading is 12%.
[0024] In a fixed-bed reactor with...
Embodiment 2
[0026] Prepare carrier, catalyst and evaluation catalyst by each step and condition of embodiment 1, just change roasting atmosphere to be helium, roasting time is 10 hours, then with the ammonium fluoride solution hydrothermal treatment of 1% (weight), treatment temperature is 200 °C, the heat treatment time is 5 hours, and the analysis results show that the conversion rate of butene is 44.1%, and the yield of propylene is 33%.
Embodiment 3
[0028] Prepare carrier, catalyzer and evaluation catalyst by each step and condition of embodiment 1, just change roasting atmosphere to be the mixture of air and helium, the volume ratio of air and helium is 1: 1, and roasting temperature is 500 ℃, and roasting time is 15 hours, and then hydrothermally treated with 10% (weight) ammonia water at 180°C for 6 hours, the analysis results showed that the conversion of butene was 48%, and the yield of propylene was 31%.
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