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The Impregnation Technics of Automotive Exhaust Control Pd/CZ/Al2O3 Catalyst

Author: ZhenXiaoJuan
Tutor: WangJun
School: Tianjin University
Course: Chemical Engineering
Keywords: Automobile exhaust three-way catalyst Single - palladium catalyst Impregnation process Precious metal dispersity Oxygen storage performance
CLC: O643.36
Type: Master's thesis
Year: 2007
Downloads: 194
Quote: 0
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Abstract


Pt, Rh, Pd precious metal - based three-way catalyst is an important method to control gasoline vehicle exhaust pollution . Single palladium (Pd) catalyst has a relatively low price , rich resources and good low-temperature catalytic activity , automobile exhaust one of the focus of the three-way catalyst . Of this thesis for Pd / CZ / Al 2 O 3 model catalyst , the preparation of single palladium catalyst impregnation process and parameters were studied and optimized for gasoline car exhaust single the palladium catalyst R \u0026 D to provide theoretical support . By impregnation method in this paper , the effects of the Pd precursor concentration , impregnated with number of impregnation order and roasting the order of to put oxygen performance impact on the catalytic activity of the catalyst and dynamic storage ; characterization methods combined with XRD, BET, TPR and precious metals degree of dispersion analysis of precious metals morphology , precious metals , and the carrier function of the three-way catalytic performance of the catalyst , dynamic storage discharge performance of oxygen . The research shows that : the precursor concentration and immersion times the catalytic activity is not monotonically increasing or decreasing relationship , there are optimal precursor concentration and dipping times help to improve the catalytic performance and oxygen storage performance . Dispersity characterization results showed that the optimal concentration of the precursor solution and impregnation times improve the dispersity of Pd , increasing the surface of the catalyst active sites , and enhance the Pd anti sintered ability . The impregnation order and firing order of Pd and CZ beneficial effect of CO conversion , Pd and Al 2 O 3 transformation of the role of HC and NO benefit results show that , TPR results showed that the Pd impregnation the order affects the Pd and the mode of action of the carrier in the fresh catalyst , Pd on a carrier distribution consistent after aging at high temperature .

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalyst
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