Preparation method of bismuth titanate visible light catalyst and application of bismuth titanate visible light catalyst
A visible light and catalyst technology, applied in catalyst activation/preparation, oxidative preparation of carbonyl compounds, chemical instruments and methods, etc., can solve the problems of difficulty in preparing high purity, complex preparation methods, etc., and achieve low cost, simple process, peak strong effect
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Embodiment 1
[0019] Dissolve 0.02mol of bismuth nitrate pentahydrate in 7.60mol of benzyl alcohol to form a solution, then add 0.200mol of tetrabutyl titanate dropwise to the above solution and stir for 3h, then move the above solution into a polytetrafluoroethylene-lined reaction kettle , heated and reacted at 120 °C for 24 h, and finally the product precursor was obtained and washed several times with absolute ethanol, and dried at 80 °C overnight to obtain the precursor.
[0020] A certain amount of precursor was weighed and calcined in a muffle furnace at 500 °C for 10 h to obtain bismuth titanate (Bi 2 Ti 2 O 7 )catalyst of light. Its XRD pattern (X-ray diffraction pattern) is as follows figure 1 shown, Bi 2 Ti 2 O 7 The diffraction characteristic peaks of all exist and are consistent with the JCPDS Card No. 32-0118. card. It shows that the Bi with good crystal ratio has been obtained. 2 Ti 2 O 7 .
[0021] Bi obtained in this example 2 Ti 2 O 7 , the 8h reaction experim...
Embodiment 2
[0023] Dissolve 0.02mol bismuth nitrate pentahydrate in 3.80mol benzyl alcohol to form a solution, then add 0.100mol tetrabutyl titanate dropwise to the above solution and stir for 0.5h, then move the above solution into a polytetrafluoroethylene-lined reaction kettle In the process, the reaction was heated at 140 °C for 20 h, and finally the product precursor was obtained and washed several times with dehydrated ethanol, and dried at 80 °C overnight to obtain the precursor.
[0024] A certain amount of precursor was weighed and calcined in a muffle furnace at 600 °C for 5 h to obtain bismuth titanate (Bi 2 Ti 2 O 7 ) photocatalyst; its XRD pattern is also consistent with figure 1 same.
[0025] Bi obtained in this example 2 Ti 2 O 7 , the 8h reaction experiment of catalytic oxidation of benzyl alcohol to benzaldehyde was carried out under visible light; figure 2 It can be seen that: the selectivity of benzaldehyde is 97%, and the conversion rate of benzyl alcohol also...
Embodiment 3
[0027] Dissolve 0.02mol bismuth nitrate pentahydrate in 2.53mol benzyl alcohol to form a solution, then add 0.067mol tetrabutyl titanate dropwise to the above solution and stir for 2h, then move the above solution into a polytetrafluoroethylene-lined reaction kettle , heated and reacted at 160 °C for 15 h, and finally the product precursor was obtained and washed several times with dehydrated ethanol, and dried at 80 °C overnight to obtain the precursor.
[0028] A certain amount of precursor was weighed and calcined in a muffle furnace at 500 °C for 10 h to obtain bismuth titanate (Bi 2 Ti 2 O 7 ) photocatalyst; its XRD pattern is also consistent with figure 1 same.
[0029] Bi obtained in this example 2 Ti 2 O 7 , the 8h reaction experiment of catalytic oxidation of benzyl alcohol to benzaldehyde was carried out under visible light; figure 2 It can be seen that: the selectivity of benzaldehyde is 92%, and the conversion rate of benzyl alcohol also reaches 96%; it sho...
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