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Modified Pd/BaCe catalyst and preparation method thereof

A catalyst and modification technology, which is applied in the field of modified Pd/BaCe catalyst and its preparation, can solve the problems of low heat capacity, reduced catalytic power, and poor purification effect of intermediate products, so as to improve performance, save cost, and reduce light-off and the effect of complete conversion temperature

Inactive Publication Date: 2019-04-05
CHENGDU UNIV OF INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The three-way catalyst can only purify the conventional pollutants in the tail gas, and the purification effect on methanol and methanol intermediate products is not good
There are mainly two types of carriers: granular and packaged. The granular carrier is made up of activated alumina spheres with a diameter of 3 to 4 mm. The catalyst is attached to the surface of the alumina spheres. Its advantages are large specific surface area, High mechanical strength and low cost, but this kind of carrier is easy to pulverize under the impact of high-temperature airflow, which directly leads to a decrease in catalytic power; honeycomb carriers are mostly made of ceramic materials. With the development of science and technology, it has been developed A metal honeycomb carrier has been developed, which has the advantages of good high temperature performance, good thermal conductivity, and low heat capacity, so it has been widely used in the field of catalysts

Method used

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  • Modified Pd/BaCe catalyst and preparation method thereof
  • Modified Pd/BaCe catalyst and preparation method thereof
  • Modified Pd/BaCe catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The preparation method of the modified Pd / BaCe catalyst of the present embodiment is as follows:

[0032] The preparation of composite oxide, according to the molar ratio of Ba and Ce 0.2:0.8, weigh Ce(NO 3 ) 3 ·6H 2 O, Ba(NO 3 ) 2 Add water, stir until completely dissolved, then drop in the precipitant NH 3 ·H 2 O adjusted the pH to 9.3, aged for 24 hours, then filtered and dried, and the obtained powder was calcined at 550-650°C for 3 hours to obtain a composite oxide.

[0033] Preparation of the carrier, weigh the composite oxide and Al 2 o 3 Grind in a grinder for 35 minutes, and then bake at 550-650° C. for 3 hours to obtain a carrier.

[0034] Catalyst preparation, adding support to PdCl 2 In the aqueous solution, stir and disperse for 0.5h, then dry and bake at 550-650°C for 3h to obtain the catalyst Pd / CeBaAl.

Embodiment 2

[0036] The preparation method of the catalyst of this implementation is the same as that of Example 1, except that the oxide used in this example is SiO 2 . The final prepared catalyst is Pd / CeBaSi.

Embodiment 3

[0038] The preparation method of the catalyst of this implementation is the same as that of Example 1, except that the oxide used in this example is TiO 2 . The final prepared catalyst is Pd / CeBaTi.

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Abstract

The invention relates to the technical field of catalysts, in particular to a modified Pd / BaCe catalyst and a preparation method thereof. Through a mechanical mixing method and by an oxide Al2O3, SiO2and TiO2 modified Pd / BaCe catalyst, the ignition and complete transformation temperature of methanol is reduced effectively, and the catalytic oxidation property of the catalyst to the methanol is improved. The specific surface area and the pore volume of the Pd / CeBaAl catalyst prepared by modification through Al2O3 are remarkably improved, adsorption of reactant molecules on the surface of the catalyst is facilitated, by large pore volume, diffusion of reaction molecules is facilitated, then catalytic reaction is facilitated, the modified Pd / BaCe catalyst has suitable surface basic sites andgood reducing property, and the deep oxidizability and resistance to CO inhibition of the methanol are improved favorably. The prepared modified Pd / BaCe catalyst is suitable for front-end purification of tail gas of vehicles with methanol fuel, unburnt methanol and an intermediate product which is generated by incomplete combustion of the methanol are converted into CO2 and H2 O, therefore, the service life of an automotive rear-end three-effect catalyst is prolonged favorably, and clean emission of tail gas is facilitated.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a modified Pd / BaCe catalyst and a preparation method thereof. Background technique [0002] At present, the sharp increase in the number of automobiles in my country has led to shortage of oil resources, serious air pollution, and increasingly stringent automobile emission standards. In addition, methanol is an oxygenated fuel with many advantages in combustion performance, so it can be used as an alternative fuel. However, due to the low temperature in the cylinder and insufficient oxygen concentration in methanol gasoline vehicles during cold start or idling, it is easy to cause incomplete combustion of methanol and produce oxygen-containing intermediate products such as aldehydes and esters. Into the vehicle exhaust and discharged, the discharge of these substances will accelerate air pollution. Therefore, it is necessary to develop a catalyst for the purification of exhaus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63F01N3/28
CPCB01J23/002B01J23/63B01J2523/00F01N3/2803B01J2523/25B01J2523/3712B01J2523/47B01J2523/824B01J2523/41B01J2523/31Y02A50/20
Inventor 张雪乔詹江波陈星仡
Owner CHENGDU UNIV OF INFORMATION TECH
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