A carbon-supported silicate catalyst and its application in catalyzing the gas-phase dehydrochlorination of chlorinated alkanes to synthesize chlorinated alkenes
A dehydrochlorination and silicate technology, which is applied in the direction of dehydrohalogenation preparation, physical/chemical process catalysts, organic chemistry, etc., can solve the problems of low activity, low catalytic activity, poor catalyst stability, etc., to improve conversion rate, Effects of high conversion, selectivity, and improved stability
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Embodiment 1
[0047] Select granular wood activated carbon, activated carbon has the following physical parameters: specific surface area 1600m 2 / g, pore volume 0.95cm 3 g -1 , wherein the proportion of micropore pore volume is 70%, the carbon tetrachloride adsorption rate is 85%, the particle strength (according to GB / T7702.3-2008) is 90%, and the ash content is 2.5%. When preparing the catalyst, the activated carbon was first impregnated in a sodium hydroxide solution with a mass percentage concentration of 10%, an alkali treatment temperature of 50°C, a solid-to-liquid volume ratio of 1:5, and a time of 5 hours. Filter and wash until the filtrate is neutral, soak the activated carbon in hydrochloric acid solution, the mass percentage concentration is 5.0%, the acid treatment temperature is 50°C, the solid-liquid volume ratio is 1:3, and the time is 5 hours, then filter and wash until the filtrate was neutral. Then it was placed in a fixed bed, and the ammonia flow rate of one volume ...
Embodiment 2
[0049] Select granular wood activated carbon, activated carbon has the following physical parameters: specific surface area 1500m 2 / g, pore volume 0.85cm 3 g -1 , wherein the proportion of micropore pore volume is 72%, the carbon tetrachloride adsorption rate is 85%, the particle strength is 90%, and the ash content is 5.5%. When preparing the catalyst, the activated carbon was first impregnated in a sodium hydroxide solution with a mass percentage concentration of 30%, an alkali treatment temperature of 30°C, a solid-to-liquid volume ratio of 1:10, and a time of 1 hour. After washing until the filtrate is neutral, soak the activated carbon in hydrochloric acid solution, the mass percentage concentration is 15.0%, the acid treatment temperature is 50 °C, the solid-liquid volume ratio is 1:5, and the time is 5 hours, then wash until the filtrate is neutral. sex. Then it was immersed in an ammonia solution with a concentration of 15.0wt%, a temperature of 80°C, a solid-to-li...
Embodiment 3
[0051] Select granular coconut shell activated carbon, the activated carbon has the following physical parameters: specific surface area 1500m 2 / g, pore volume 0.80cm 3 g -1 , wherein the proportion of micropore pore volume is 75%, the carbon tetrachloride adsorption rate is 90%, the particle strength is 90%, and the ash content is 3.5%. When preparing the catalyst, the activated carbon was first impregnated in a potassium hydroxide solution with a mass percent concentration of 15%, an alkali treatment temperature of 90°C, a solid-to-liquid volume ratio of 1:2, and a time of 10 hours. After washing until the filtrate is neutral, soak the activated carbon in hydrochloric acid solution, the mass percentage concentration is 25.0%, the acid treatment temperature is 30 ° C, the solid-liquid volume ratio is 1:10, and the time is 10 hours, then wash until the filtrate is neutral. sex. Then it was immersed in an ammonia solution with a concentration of 15.0wt%, a temperature of 50...
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