Cyclohexene hydrating process
A technology of cyclohexene hydration and ene hydration, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, hydroxyl addition preparation, physical/chemical process catalyst, etc., can solve the problem of low catalytic efficiency, rectification and heterogeneity Phase-catalyzed cyclohexene hydration coupling can not be realized and other problems, to achieve the effect of improving synthesis efficiency, good hydrothermal stability, and ingenious design
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Embodiment 1
[0023] Using ammonium metatungstate as the W source and zirconium oxychloride as the Zr source, WO was synthesized by co-precipitation 3 / ZrO 2 Solid superacid catalyst. Dissolve a certain amount of zirconium oxychloride in water, then add dropwise 30wt.% concentration of NH 3 water until the pH of the solution was 10 and refluxed at 100°C for 24h. The resulting suspension was washed until it was free of chloride ions and centrifuged to obtain Zr(OH) 4 The carrier was then dried at 105°C. Zr(OH) 4 After the powder is added to a certain concentration of ammonium metatungstate solution, the suspension is slowly evaporated at 80-95°C until all the ammonium metatungstate is loaded on Zr(OH) 4 carrier. The supported catalyst precursor was calcined at 700 °C for 5 h to finally obtain WO 3 / ZrO 2 Solid superacid, the BET specific surface of the catalyst is 65m 2 / g. Among them WO 3 The content in the catalyst is based on ammonium metatungstate and ZrOCl 2 The difference i...
Embodiment 2
[0026] Using ammonium metatungstate as the W source, zirconium isopropoxide as the Zr source, and cetyltrimethylammonium bromide (CTAB) as the template, mesoporous WO was synthesized by a sol-gel method. 3 / ZrO 2 Solid superacid catalyst. First prepare a certain concentration of CTAB transparent microemulsion at 40°C, then add zirconium isopropoxide and ammonium metatungstate at the same time and continue to stir for 5 hours. During this process, the pH value of the solution was adjusted to about 10, and the molar ratio of zirconium isopropoxide and CTAB was controlled at 1.0-1.2. The resulting gel was crystallized at 80 °C for 24 h and then calcined at 700 °C for 5 h to obtain mesoporous WO 3 / ZrO 2 Solid superacid catalyst. The BET specific surface of the solid superacid catalyst is 250m 2 / g or so, the average pore size is 6.5nm. WO 3 The content in the catalyst varies from 7.0 to 15.0 wt.% according to the amount of zirconium isopropoxide and ammonium metatungstate ...
Embodiment 3
[0029] Using ammonium metatungstate as the W source, zirconium isopropoxide as the Zr source, and cetyltrimethylammonium bromide (CTAB) as the template, mesoporous WO was synthesized by a sol-gel method. 3 / ZrO 2 Solid superacid catalyst. First prepare a certain concentration of CTAB transparent microemulsion at 40°C, then add zirconium isopropoxide and ammonium metatungstate at the same time and continue to stir for 5 hours. During this process, the pH value of the solution is adjusted to about 10, and the molar ratio of zirconium isopropoxide and CTAB is controlled at 0.8-1.0. The resulting gel was crystallized at 80 °C for 24 h and then calcined at 750 °C for 5 h to obtain mesoporous WO 3 / ZrO 2 Solid superacid catalyst. The BET specific surface of the solid superacid catalyst is 395m 2 / g or so, the average pore diameter is 5.5nm. WO 3 The content in the catalyst varies from 7.0 to 15.0 wt.% according to the amount of zirconium isopropoxide and ammonium metatungstat...
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