Preparation method of supported Pd catalyst

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...

AI Technical Summary

Problems solved by technology

However, there are few reports on alkaline earth metals in the purification of exhaust gas from methanol gasoline vehicles