Method for preparing high-specific-surface-area chromium-based fluorination catalyst
A technology based on fluorination catalyst and high specific surface area, applied in physical/chemical process catalysts, chemical instruments and methods, halogen substitution preparation, etc., can solve the problems of high production cost, harshness, unfavorable large-scale industrial production, etc. Control, practicality, and cheap effects
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example 1
[0038] Weigh 48.0g chromium nitrate nonahydrate and dissolve it in 1.2L distilled water; weigh 30.3g citric acid monohydrate and dissolve it in 1.44L distilled water. Pay attention to stirring in the middle, and the two solutions are mixed evenly. After the dropwise addition, the initial pH of the mixed solution was <1. At this time, an appropriate amount of concentrated ammonia water was added dropwise to the mixed solution to adjust the pH value to 3. Then, the mixed solution was evaporated and concentrated in a water bath at 70°C. When the solution was in the form of a viscous colloid, it was transferred to a vacuum drying oven and dried at 120°C to form a xerogel. When the dry gel is ignited in the air, self-propagating combustion can occur to form a fluffy powder.
[0039] The resulting fluffy powder is compressed into a catalyst precursor. Take 5ml of the catalyst precursor and put it into the middle of a tubular reactor made of SUS316 with an inner diameter of 1cm and...
example 2
[0044] Weigh 45.6g chromium nitrate nonahydrate and 1.8g zinc nitrate hexahydrate and dissolve them in 1.2L distilled water; weigh 30.3g citric acid monohydrate and dissolve them in 1.44L distilled water. In the salt solution, pay attention to stirring during the dropwise addition, and the two solutions are mixed evenly. After the dropwise addition, the initial pH of the mixed solution was <1. At this time, an appropriate amount of concentrated ammonia water was added dropwise to the mixed solution to adjust the pH value to 3. Then, the mixed solution was evaporated and concentrated in a water bath at 70°C. When the solution was in the form of a viscous colloid, it was transferred to a vacuum drying oven and dried at 120°C to form a xerogel. When the dry gel is ignited in the air, self-propagating combustion can occur to form a fluffy powder.
[0045] The resulting fluffy powder is compressed into a catalyst precursor. Take 5ml of the catalyst precursor and put it into the m...
example 3
[0050] Weigh 40.8g chromium nitrate nonahydrate and 5.3g zinc nitrate hexahydrate and dissolve it in 1.2L distilled water; weigh 30.3g citric acid monohydrate and dissolve it in 1.44L distilled water. In the salt solution, pay attention to stirring during the dropwise addition, and the two solutions are mixed evenly. After the dropwise addition, the initial pH of the mixed solution was <1. At this time, an appropriate amount of concentrated ammonia water was added dropwise to the mixed solution to adjust the pH value to 3. Then, the mixed solution was evaporated and concentrated in a water bath at 70°C. When the solution was in the form of a viscous colloid, it was transferred to a vacuum drying oven and dried at 120°C to form a xerogel. When the dry gel is ignited in the air, self-propagating combustion can occur to form a fluffy powder.
[0051] The resulting fluffy powder is compressed into a catalyst precursor. Take 5ml of the catalyst precursor and put it into the middl...
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