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Pt-containing catalyst suitable for gasoline vehicle tail gas purification, and preparation method thereof

A tail gas purification and catalyst technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of Pt replacing Pd catalysts with thermal stability decline, and achieve excellent Effects of anti-aging performance, improvement of catalytic performance, and improvement of thermal aging ability

Pending Publication Date: 2021-01-15
SINOCAT ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem that the thermal stability of Pt-substituted Pd catalysts in the prior art will be greatly reduced, and to provide a Pt-containing catalyst with excellent thermal stability suitable for gasoline vehicle exhaust purification and its preparation method

Method used

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  • Pt-containing catalyst suitable for gasoline vehicle tail gas purification, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Undercoat composition:

[0032] The underlying coating is a Pt-Pd layer with a Pt content of 50g / ft 3 , Pd content is 50g / ft 3. impregnated in the first cerium-zirconium composite oxide (40wt% CeO 2 , 55wt% ZrO 2 , 5wt% La 2 o 3 ) of Pt is 40g / ft 3 , Pd is 10g / ft 3 ,CeO 2 The content is 5% of the first cerium-zirconium composite oxide. 10 g / ft of Pt impregnated in lanthanum modified alumina (1% lanthanum content) 3 ,Pd is 40g / ft 3 , the BaO content is 5% of lanthanum-modified alumina, the first cerium-zirconium composite oxide in the bottom coating is 50g / L, the lanthanum-modified alumina is 50g / L, and the binder aluminum sol is 3g / L. The coating amount was 103 g / L.

[0033] Top coat composition:

[0034] Top coating Rh layer, Rh content is 10g / ft 3 . Among them, in the second cerium-zirconium composite oxide (10wt% CeO 2 , 85wt% ZrO 2 , 5wt% La 2 o 3 ) impregnated with 7.0gRh and 1% Nd 2 o 3 , Rh 3.0 g / ft impregnated in lanthanum-modified alumina (...

Embodiment 2

[0043] Undercoat composition:

[0044] The underlying coating is a Pt-Pd layer with a Pt content of 20g / ft 3 , Pd content is 20g / ft 3 . impregnated in the first cerium-zirconium composite oxide (40wt% CeO 2 , 55wt% ZrO 2 , 5wt%Pr 6 o 11 ) of Pt is 19g / ft 3 , Pd is 1g / ft 3 ,CeO 2 The content is 5% of the first cerium-zirconium composite oxide, and the first cerium-zirconium composite oxide is 1 g / ft of Pt impregnated in lanthanum-modified alumina (lanthanum content is 5 wt%) 3 ,Pd is 19g / ft 3 , the content of BaO is 10wt% of lanthanum-modified alumina, the first cerium-zirconium composite oxide in the bottom coating is 50g / L, the lanthanum-modified alumina is 50g / L, and the binder aluminum sol is 10g / L. The coating amount was 110 g / L.

[0045] Top coat composition:

[0046] Top coating Rh layer, Rh content is 10g / ft 3 . Among them, in the second cerium-zirconium composite oxide (10wt% CeO 2 , 85wt% ZrO 2 , 5wt% Nd 2 o 3 ) impregnated to 9g / ft 3 Rh and 5% Nd ...

Embodiment 3

[0055] Undercoat composition:

[0056] The underlying coating is a Pt-Pd layer with a Pt content of 150g / ft 3 , Pd content is 50g / ft 3 . Immersed in the first cerium-zirconium composite oxide (40wt% CeO2, 55wt% ZrO2, 5wt% Pr 6 o 11 ) of Pt is 140g / ft 3 , Pd is 10g / ft 3 ,CeO 2 The content is 10% of the first cerium-zirconium composite oxide, the first cerium-zirconium composite oxide is 10 g / ft of Pt impregnated in lanthanum-modified alumina (10% lanthanum content) 3 ,Pd is 40g / ft 3 , the SrO content is 8% of lanthanum-modified alumina, the first cerium-zirconium composite oxide in the bottom coating is 150g / L, the lanthanum-modified alumina is 40g / L, and the binder aluminum sol is 10g / L. The coating amount was 200 g / L.

[0057] Top coat composition:

[0058] Top coating Rh layer, Rh content is 20g / ft 3 . Wherein the second cerium-zirconium composite oxide (10wt% CeO2, 85wt% ZrO2, 5wt% Nd 2 o 3 ) impregnated to 16g / ft 3 Rh and 5% Nd 2 o 3 , Rh impregnated in la...

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PUM

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Abstract

The invention discloses a Pt-containing catalyst suitable for gasoline vehicle tail gas purification, and a preparation method of the Pt-containing catalyst. The catalyst is composed of a honeycomb carrier and a coating coated on the pore wall of the carrier, wherein the coating comprises a bottom coating coated on the surface of the pore wall of the carrier and an upper coating coated on the surface of the bottom coating, the bottom coating comprises noble metals Pt and Pd, an auxiliary agent CeO2, an alkaline earth metal oxide, modified aluminum oxide and a cerium-zirconium composite oxide,and the upper coating comprises a noble metal Rh, an auxiliary agent Nd2O3, modified aluminum oxide and a cerium-zirconium composite oxide. According to the invention, Pt, Pd, Ce and the like are co-impregnated in a cerium-zirconium composite oxide in equal volume, a large amount of CeO2 is formed around Pt to form a Pt-O bond or a Pt-O-Ce bond, the oxidation state of Pt can be maintained so as tostabilize Pt, and a small amount of Pd can improve the catalytic performance of Pt; and Pt, Pd and alkaline-earth metal oxide are adopted to be co-impregnated in modified aluminum oxide in an isopyknic manner, the thermal aging capacity of the catalyst can be improved by adding the alkaline-earth metal oxide, and the catalytic performance of Pd can be improved by a small amount of Pt.

Description

technical field [0001] The invention belongs to the technical field of catalyst research and preparation, in particular to the technical field of research and preparation of automobile tail gas purification catalysts, and relates to a noble metal catalyst, in particular to a Pt-containing catalyst suitable for gasoline vehicle tail gas purification and a preparation method thereof. Background technique [0002] With the increasingly urgent energy and environmental issues, in order to protect the environment and save energy, people put forward higher requirements for the emission control of motor vehicle exhaust. It is well known that the main pollutants of automobile exhaust are carbon monoxide (CO), hydrocarbons (HC), nitrogen oxides (NOx) and particulate matter. The three-way catalyst installed in the exhaust system of automobiles can effectively convert carbon monoxide, hydrocarbons, and nitrogen oxides in automobile exhaust into carbon dioxide (CO 2 ), water (H 2 O) an...

Claims

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Application Information

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IPC IPC(8): B01J23/63F01N3/10F01N3/28
CPCB01J23/002B01J23/63F01N3/101F01N3/2828B01J2523/00B01J2523/25B01J2523/31B01J2523/3712B01J2523/3725B01J2523/3718B01J2523/48B01J2523/24B01J2523/3706Y02A50/20
Inventor 李大成孙创王金凤杨怡杨兰王云李云陈启章王霞崔李强蒋发军张锋张志凤文杰魏小杰
Owner SINOCAT ENVIRONMENTAL TECH
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