A kind of PT-based catalyst and its preparation method and application
A catalyst and carbon monoxide technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as poor stability, easy agglomeration and deactivation of precious metal Pt, and difficult agglomeration and deactivation of precious metal Pt, etc. Achieve the effect of not easy to agglomerate and deactivate, and good stability
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[0054] 2. Rod CeO 2 preparation of
[0055] The calculated amount of cerium in nitric acid solution (Ce(NO 3 ) 2 ·6H 2 O) dissolve in an appropriate amount of deionized water, and stir evenly;
[0056] Dissolve the calculated amount of sodium hydroxide (NaOH) in an appropriate amount of deionized water, and stir in a fume hood;
[0057] Mix the above two solutions, and ultrasonically stir at 60°C for 1h, pour the mixed solution into a Teflon tank, and put it in an oven for hydrothermal treatment at 100°C for 24h;
[0058] Take out the Teflon tank, transfer the mixed solution to a beaker after it has cooled to room temperature, and wash it with water and ethanol several times until the solution is neutral, and the light yellow rod-shaped CeO 2 .
Embodiment 1
[0060] A preparation method for a Pt-based catalyst, comprising the steps of:
[0061] S1. Weigh a certain amount of prepared modified carrier 4%La / Al 2 o 3 into a 50mL beaker, the calculated amount of H 2 PtCl 6 Add it drop by drop, and react in an ultrasonic machine at 60°C for 1h, after immersion for 2h, remove the solvent, transfer to a quartz boat and calcinate in a microwave calciner at 450W, 350°C for 2h to obtain a transition catalyst Pt / La-Al 2 o 3 ;
[0062] S2. Pt / La-Al in step S1. 2 o 3 and the prepared pale yellow rod-shaped CeO 2 Physically mix at a mass ratio of 2:1, and grind uniformly in a mortar for 15 minutes, wherein the mass fraction of Pt is guaranteed to be 1%; the ground sample is calcined in a microwave calciner at 1000W for 14 hours to obtain a Pt-based catalyst .
Embodiment 2～4
[0064] The difference from Example 1 is that the calcination powers of Step S2 in Examples 2-4 are 800W, 900W and 1100W respectively, as shown in Table 1; other raw material usage and operation steps are the same as Example 1.
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