Pt-Pd bimetallic catalyst for NO oxidation and preparation method of Pt-Pd bimetallic catalyst

A bimetallic catalyst, precious metal technology, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve problems such as failure to meet regulatory requirements, achieve outstanding NO oxidation capacity, wide conversion temperature window, and easy steps Effect

Inactive Publication Date: 2017-06-09
WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to meet the emission limits of NOx and PM, the main pollutants of diesel vehicle exhaust in the National V and above regulations, the exhaust after-treatment device is only equipped with DOC, which cannot meet the requirements of the regulations.

Method used

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  • Pt-Pd bimetallic catalyst for NO oxidation and preparation method of Pt-Pd bimetallic catalyst
  • Pt-Pd bimetallic catalyst for NO oxidation and preparation method of Pt-Pd bimetallic catalyst

Examples

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Effect test

Embodiment 1

[0018] Example 1: A Pt-Pd bimetallic catalyst for NO oxidation, the catalyst carrier is cordierite honeycomb ceramic, the volume is 1.101 liters, and the pore density is 400 mesh / square foot; the coating contains manganese-aluminum composite oxide And molecular sieve, the coating amount is 120 g / L; the coating amount of the precious metal used is 1.4 g / L, and the mass ratio of the precious metal Pt to the precious metal Pd is 3:1.

[0019] The preparation method includes the following steps:

[0020] (1) Preparation of manganese-aluminum composite oxide by equal volume impregnation method: Manganese-aluminum composite oxide is prepared by equal volume impregnation method. Weigh 588 grams of alumina powder, weigh 39 grams of manganese nitrate and dissolve it to prepare an aqueous solution with saturated adsorption capacity of the alumina used, then add the manganese nitrate solution dropwise to the alumina powder and continue stirring for 6 hours; Then it was allowed to stand and a...

Embodiment 2

[0025] The specific preparation method is basically the same as that of Example 1, except that in the manganese-aluminum composite oxide used, the mass ratio of manganese element to alumina is 1:24 to obtain catalyst B.

Embodiment 3

[0027] The specific preparation method is basically the same as that of Example 1, except that in the manganese-aluminum composite oxide used, the mass ratio of manganese element to alumina is 3:47, to obtain catalyst C.

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Abstract

The invention relates to a Pt-Pd bimetallic catalyst for NO oxidation. The Pt-Pd bimetallic catalyst comprises a carrier, the carrier is coated with a coating loading precious metal Pt and precious metal Pd, the coating comprises a manganese-aluminum composite oxide and a molecular sieve, the weight ratio of manganese to aluminum oxide in the manganese-aluminum composite oxide is 1:9-99, the coating amount of the coating is 80-180 g/L, the coating amount of the precious metal Pt and the precious metal Pd is 0.5-4.5 g/L, and the weight ratio of the precious metal Pt and the precious metal Pd is (15-1):1. According to a preparation method of the Pt-Pd bimetallic catalyst, firstly, the manganese-aluminum composite oxide is prepared in an equivalent-volume impregnation and high-temperature activation manner; secondly, slurry is prepared, and the precious metal Pt and the precious metal Pd are added; finally, the carrier is soaked into the slurry, dried and sintered to prepare into the catalyst. The preparation method of the catalyst is simple and easy to operate, the prepared catalyst has remarkable oxidizing capacity for NO in tail gas of a diesel vehicle, the conversion ratio of produced NO2 is high, a conversion temperature window of the NO2 is wide, the heat stability of the catalyst is good, and the catalyst has high HC and CO oxidizing capacity.

Description

Technical field [0001] The invention relates to a Pt-Pd bimetallic catalyst for NO oxidation and a preparation method thereof, and belongs to the technical field of catalyst preparation. Background technique [0002] The internal combustion engine is the most important power source for mobile sources such as automobiles and ships. With the rapid economic development, people's demand for transportation has increased, which has promoted the rapid growth of car ownership. Compared with gasoline vehicles, diesel vehicles have higher effective efficiency and fuel economy, and cover a wider range of power and speed, but their pollutant emissions cannot be underestimated. The pollutants emitted by diesel vehicles are mainly carbon monoxide (CO), hydrocarbons (HC), nitrogen oxides (NOX) and particulate matter (PM). The particulate matter mainly includes dry carbon, soluble organic matter (SOF) and a small amount of sulfuric acid and sulfate. composition. CO is colorless and odorless a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/076B01D53/94B01D53/56B01D53/62B01D53/72
CPCB01D53/945B01D2258/012B01J29/7815Y02A50/20
Inventor 张元杨金季燕军王秀庭柯峰王刚丁薇邱祎源王平立张辉孙亮张杰陈同同冯洁岳军贾莉伟
Owner WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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