Phosphorous-aluminium-mixed oxide catalyst, process for its preparation and use thereof
A polyhydroxybenzene monoalkyl ether, a range of technology, applied in the field of phosphorus-aluminum mixed oxide catalysts, can solve the problems of reduced catalytic activity and selectivity
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example 1
[0035] Take 59.2g of AlCl 3 ·6H 2 O with stirring 200ml 0.5N HCl (190ml HCl 2 0+10ml 37% HCl). Then add 21ml of 85%wt H 3 PO 4 . Then use concentrated NH 4 OH (about 90 ml) was added dropwise to the still clear solution to adjust the pH to about 7. The precipitate formed is subsequently dried by suction on a filter, in order to obtain a paste. The paste was then placed in a static dryer at 120°C for 12 hours to obtain a dry white mass which was then treated at high temperature in a stream of air with the following schedule: at 10°C The heating rate was raised from room temperature to 300°C at a rate of 10°C / min, and then kept at 300°C for 4 hours, then heated at a rate of 10°C / min from 300°C to 600°C, and kept at 600°C for 4 hours. The surface area of the final sample is 74±5m 2 / g. The solid is then subjected to compression, granulation and sieving in order to obtain granules having an average particle size in the range of 0.5-1 mm. In the final catalyst, the ana...
example 2
[0037] Follow the same procedure as in Example 1, but with AlCl 3 ·6H 2 O and H 3 PO 4 The amounts are 20g and 8.1ml, respectively. After heat treatment, the Al / P analytical ratio in the final catalyst was 0.67 ± 0.04.
example 4
[0041] Under the above reaction conditions, the catalyst prepared as described in Example 1 was tested in the monoetherification reaction of catechol and methanol. In particular, the reaction temperature is 190°C. The test results obtained during the entire 1300-hour reaction life period are summarized in the table.
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