Preparation method of catalyst for synthesis of benzophenone by dehydrogenation of benzhydrol
A technology of diphenylmethanol and benzophenone, which is applied in the field of heterogeneous catalytic reactions, can solve problems such as complex processes, inability to meet the requirements of green environmental protection development, and expensive raw materials, and achieve high reaction efficiency, long life, and high selectivity. Effect
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Embodiment 1
[0035] This embodiment is a preparation method for the synthesis of benzophenone catalyst through the dehydrogenation of diphenylmethanol, and the steps are as follows:
[0036] (1) Preparation of mesoporous silica material Cu-Fe-HMS
[0037] 33mL concentration is 0.068mol L -1 Cu(NO 3 ) 2 Aqueous solution, 0.068mol·L -1 Fe(NO 3 ) 3 Aqueous solution, 1.0mL (1mol L -1) hydrochloric acid and 15.0 g of absolute ethanol were successively added into a 50 ml beaker, stirred magnetically for 30 min, and then the mixed solution was added into a three-necked flask containing 3.26 g of hexadecylamine, and stirred for 30 min in a water bath at 45°C. Then, a mixed solution of 3.0 g of isopropanol and 10.4 g of tetraethyl orthosilicate was slowly added dropwise, and stirring was continued for 18 hours in a water bath at 45°C. The obtained product was centrifuged and washed several times, and the obtained solid powder was dried in an oven at 100 °C for 10 h, then transferred to a muf...
Embodiment 2
[0043] The Pd-L-Cu-Fe-HMS catalyst obtained in Example 1 is used for the synthesis of benzophenone by the dehydrogenation of diphenylmethanol, and the specific steps are to add 20 mg of Pd-L-Cu-Fe- HMS catalyst, 0.25g benzhydryl alcohol and 35ml ethanol, react under normal pressure, stirring and heating under reflux conditions for 18h, after the reaction is completed, filter out the catalyst, distill and remove the solvent to obtain benzophenone with a yield of 99.7%.
Embodiment 3
[0045] The catalyst recovered in Example 2 is used for the synthesis of benzophenone by the dehydrogenation of diphenylmethanol, and the specific steps are: in a 100mL round-bottomed flask, add the catalyst 15mg Pd-L-Cu-Fe- HMS catalyst, 0.2g benzphenyl alcohol and 35ml ethanol, react under normal pressure, stirring and heating under reflux conditions for 18h, after the reaction is completed, filter out the catalyst, distill off the solvent to obtain benzophenone, the yield is greater than 99.4%.
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