Catalyst for catalyzing direct oxidation of toluene to prepare benzaldehyde and preparation method thereof
A technology of benzaldehyde and catalyst, which is applied in the catalyst field of direct oxidation of toluene to benzaldehyde and its preparation, and in the field of catalysts, can solve the problems of uneconomical industrial production, high reaction temperature, and difficult product separation, and achieve easy separation, purification, and reaction Mild conditions to enhance the effect of interaction
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[0022] Example 1:
[0023] A catalyst for the direct oxidation of toluene to benzaldehyde, comprising the following components: magnesia alumina composite oxide carrier 80wt%, wherein the molar ratio of magnesia to alumina is 1, cerium 10wt%, cobalt 3wt%, and copper 5wt% , Nickel 2wt%.
[0024] The preparation method of the above catalyst includes the following steps:
[0025] 1) Weigh 150gAl(NO 3 ) 3 ·9H 2 O and 51.3gMg(NO 3 ) 2 ·6H 2 O is dissolved in 1200mL deionized water to prepare a total concentration of 0.5mol·L -1 Mixed salt solution, weigh 80g NaOH dissolved in 400ml deionized water to prepare 5mol·L -1 Add the NaOH solution dropwise to the mixed salt solution under stirring conditions. Keep the pH value of the system at 9-10 during the dripping process. After the dropwise addition of the NaOH solution, continue to stir and age for 3 hours, and the resulting product Filter, use deionized water to wash 3 times repeatedly, dry in a constant temperature drying oven at 100°C, ...
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[0028] Example 2:
[0029] A catalyst for the direct oxidation of toluene to benzaldehyde, comprising the following components: magnesia alumina composite oxide carrier 90wt%, wherein the molar ratio of magnesia to alumina is 1, cerium 4wt%, cobalt 5wt%, and copper 0.5wt %, 0.5wt% nickel.
[0030] The preparation method of the above catalyst includes the following steps:
[0031] 1) Weigh 150gAl(NO 3 ) 3 ·9H 2 O and 51.3gMg(NO 3 ) 2 ·6H 2 O is dissolved in 1200mL deionized water to prepare a total concentration of 0.5mol·L -1 Mixed salt solution, weigh 80g NaOH dissolved in 400ml deionized water to prepare 5mol·L -1 Add the NaOH solution dropwise to the mixed salt solution under stirring conditions. Keep the pH value of the system at 9-10 during the dripping process. After the dropwise addition of the NaOH solution, continue to stir and age for 3 hours, and the resulting product Filter, use deionized water to wash 3 times repeatedly, dry in a constant temperature drying oven at 100°...
Example Embodiment
[0034] Example 3:
[0035] A catalyst for the direct oxidation of toluene to benzaldehyde, comprising the following components: magnesia alumina composite oxide carrier 85wt%, wherein the molar ratio of magnesium oxide to alumina is 2, cerium 6wt%, cobalt 5wt%, and copper 3wt% , Nickel 1wt%.
[0036] The preparation method of the above catalyst includes the following steps:
[0037] 1) Weigh 39.9g AlCl 3 And 28.8gMgCl 2 Dissolved in 1200mL deionized water, formulated to a total concentration of 0.5mol·L -1 Mixed salt solution, weigh 80g NaOH dissolved in 400ml deionized water to prepare 5mol·L -1 Add the NaOH solution dropwise to the mixed salt solution under stirring conditions. Keep the pH value of the system at 9-10 during the dripping process. After the dropwise addition of the NaOH solution, continue to stir and age for 3 hours, and the resulting product Filter, wash with deionized water for 3 times, dry in a constant temperature drying oven at 100°C, and place it in a muffle f...
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