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A catalyst and supported technology, which is applied in the field of preparation of supported Pd catalysts, to achieve the effects of increasing catalytic reaction rate, accelerating migration, and improving reduction performance
Inactive Publication Date: 2017-05-31
SHAANXI SHENGMAI PETROLEUM
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Problems solved by technology
However, there are few reports on alkaline earth metals in the purification of exhaust gas from methanol gasoline vehicles
Method used
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Embodiment 1
[0019] ZrOCO 3 , Ce (NO 3 ) 3 , La (NO 3 ) 3 and Al (NO 3 ) 3 Dissolve, mix evenly, and titrate with a precipitant, the pH value is 8. After the titration is completed, it is filtered by suction and dried, and the obtained powder is roasted to obtain a catalyst carrier;
[0020] Immerse the above carrier in the aqueous solution of Pd and alkaline earth metal nitrate respectively, dry and roast to obtain the catalyst powder, then grind the obtained catalyst powder to make a slurry and coat it on the cordierite honeycomb ceramic substrate, and then bake Dry and calcined to prepare supported Pd catalyst.
[0021] Wherein, the precipitation agent is ammonia water. The temperature of the calcination is 550° C., and the calcination time is 2.5 hours. The ratio of the amount of substances of each component of the catalyst carrier is (Ce):n (Zr):n (La):n (Al)=4.5:4.5:1:10. The said carrier is respectively impregnated in the aqueous solution of Pd and alkaline earth metal nitr...
Embodiment 2
[0023] ZrOCO 3 , Ce (NO 3 ) 3 , La (NO 3 ) 3 and Al (NO 3 ) 3 Dissolve, mix evenly, and titrate with a precipitant, the pH value is 8. After the titration is completed, it is filtered by suction and dried, and the obtained powder is roasted to obtain a catalyst carrier;
[0024] Immerse the above carrier in the aqueous solution of Pd and alkaline earth metal nitrate respectively, dry and roast to obtain the catalyst powder, then grind the obtained catalyst powder to make a slurry and coat it on the cordierite honeycomb ceramic substrate, and then bake Dry and calcined to prepare supported Pd catalyst.
[0025] Wherein, the precipitation agent is ammonia water. The temperature of the calcination is 600° C., and the calcination time is 3 hours. The ratio of the amount of substances of each component of the catalyst carrier is (Ce):n (Zr):n (La):n (Al)=4.5:4.5:1:10. The said carrier is respectively impregnated in the aqueous solution of Pd and alkaline earth metal nitrat...
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Abstract
The invention relates to the technical field of functional materials and particularly relates to a preparation method of a supported Pd catalyst. The preparation method of the supported Pd catalyst comprises the following steps: dissolving ZrOCO3, Ce(NO3)3, La(NO3) and Al(NO3), uniformly mixing, carrying out titration by taking ammonia water as a precipitant, carrying out suction filtration after titration, drying, and roasting the obtained powder at 600 DEG C for 3 hours, so as to obtain a catalyst supporter, wherein the ratio of n(Ce) to n(Zr) to n(La) to n(Al) is 4.5 to 4.5 to 1 to 10; and respectively dipping the catalyst supporter into water solutions of Pd and alkaline earth nitrate by adopting an equal pore volume dipping method, drying, roasting to obtain catalyst powder containing 2% of Pd and 5% of MgO, grinding the obtained catalyst powder into slurry, coating a cordierite honeycomb ceramic matrix with the slurry in a coating quantity of 140g/L, drying, and roasting at 550 DEG C for 3 hours, so as to obtain the supported Pd catalyst. According to the supported Pd catalyst, the dispersity of an active component Pd on the surface of a supporter is obviously improved, and the reducing property of the catalyst is improved; and the transfer of active oxygen between metals and the supporter is accelerated, and the catalytic reaction rate is increased.
Description
technical field [0001] The invention relates to the technical field of functional materials, in particular to a preparation method of a supported Pd catalyst. Background technique [0002] Methanol as a substitute fuel for gasoline can significantly reduce the emissions of HC, CO, NOx and particulate matter in the exhaust. However, the exhaust of methanol-fueled vehicles contains not only conventional pollutants but also incompletely combusted methanol and partial oxidation products. Strictly purifying and directly entering the atmosphere will inevitably cause secondary pollution of the atmosphere. The core technology to solve secondary pollution is the low-temperature deep oxidation of methanol. Since the noble metal Pd is relatively cheap compared to other noble metals and has high catalytic oxidation activity, there are many research reports on Pd. Introducing basic rare earth La into Pd / Al 2 o 3 It is found that the introduction of basic metal La can not only greatly...
Claims
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Application Information
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