Pd/CeBaSi catalyst and preparation method thereof
A technology of catalyst and preparation steps, which is applied in the field of Pd/CeBaSi catalyst and its preparation, and can solve the problems of incomplete low-temperature deep oxidation of methanol, poor purification effect of intermediate products, and great influence of air-fuel ratio.
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Embodiment 1
[0031] The present embodiment adopts co-precipitation method to prepare modified Pd / BaCe catalyst, as follows:
[0032] The preparation of carrier, according to mass ratio 13:87:100 respectively weigh Ba(NO 3 ) 2 , Ce(NO 3 ) 3 ·6H 2 O, Na 2 SiO 3 9H 2 O was added to water and stirred until completely dissolved to obtain a brine, followed by NH 3 ·H 2 O as the lye, take the salt solution and the lye at the same time with a flow rate ratio of 1: (1.5 ~ 2) and drop them into the reaction container to stir and react, age for 24h, and suction filter the obtained reaction solution. After drying, the obtained powder Calcined at 550-650°C for 3 hours to obtain a carrier composite oxide.
[0033] Catalyst preparation, adding support composite oxide to PdCl 2 In the aqueous solution, stir and disperse for 0.5h, then dry and bake at 550-650°C for 3h to obtain the catalyst Pd / CeBaSi-1.
Embodiment 2
[0035] The present embodiment adopts hydrothermal synthesis method to prepare modified Pd / BaCe catalyst, as follows:
[0036] The preparation of carrier, according to mass ratio 13:87:100 respectively weigh Ba(NO 3 ) 2 , Ce(NO 3 ) 3 ·6H 2 O, Na 2 SiO 3 9H 2 O was added to water and stirred until completely dissolved to obtain a brine, followed by NH 3 ·H 2O as lye, take salt solution and lye at the flow rate ratio of 1: (1.5 ~ 2) and drop them into the reaction vessel at the same time to stir the reaction, then transfer to the high-pressure reactor, and crystallize at 140°C for 72h to obtain the reaction liquid, and the reaction liquid was suction-filtered and dried, and the obtained powder was calcined at 550-650°C for 3 hours to obtain a carrier composite oxide.
[0037] Catalyst preparation, adding support composite oxide to PdCl 2 In the solution, stir and disperse for 0.5h, then dry and bake at 550-650°C for 3h to obtain the catalyst Pd / CeBaSi-2.
Embodiment 3
[0039] The present embodiment adopts salt drop alkali method to prepare modified Pd / BaCe catalyst, as follows:
[0040] The preparation of carrier, according to mass ratio 13:87:100 respectively weigh Ba(NO 3 ) 2 , Ce(NO 3 ) 3 ·6H 2 O, Na 2 SiO 3 9H 2 O was added to water and stirred until completely dissolved to obtain a brine, followed by NH 3 ·H 2 O as lye, add the salt solution dropwise into the lye and stir for reaction, then age for 24 hours, filter the obtained reaction solution, dry, and roast the obtained powder at 550-650°C for 3 hours to obtain a carrier composite oxide .
[0041] Catalyst preparation, adding support composite oxide to PdCl 2 In the solution, stir and disperse for 0.5h, then dry and bake at 550-650°C for 3h to obtain the catalyst Pd / CeBaSi-3.
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Abstract
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