Combined catalyst for simultaneously eliminating four kinds of pollutants from diesel exhaust and purification method

A combination of catalyst and diesel engine technology, applied in chemical instruments and methods, physical/chemical process catalysts, molecular sieve catalysts, etc., to achieve mild reaction and operating conditions

Inactive Publication Date: 2009-07-01
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the catalytic purification method disclosed in this patent does not involve the simultaneous catalytic purification of the four pollutants carbon particles, nitrogen ox

Method used

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  • Combined catalyst for simultaneously eliminating four kinds of pollutants from diesel exhaust and purification method
  • Combined catalyst for simultaneously eliminating four kinds of pollutants from diesel exhaust and purification method
  • Combined catalyst for simultaneously eliminating four kinds of pollutants from diesel exhaust and purification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Combine 0.005 g of simulated carbon particles with 0.1 g of La 0.6 K 0.4 CoO 3 / Al 2 O 3 (50% loading, the specific surface area of ​​the activated alumina carrier is 147.9m 2 / g, pore volume 0.2793ml / g) The catalyst was stirred evenly with a sample spoon to form loose contact, and then filled into the upper layer of the quartz tube reactor, separated by quartz wool (about 1 cm spacing), and then filled with 0.2g of W / HZSM-5 (1% tungsten oxide loading, and the silicon-alumina ratio of molecular sieve is 25).

[0036] Diesel engine exhaust gas simulated gas composition: 2000ppm NO, 1000ppm C 2 H 2 , 2000ppm CO, O 2 The initial concentration was 5%, and He was the diluent gas.

[0037] The above simulated diesel exhaust gas enters upward from the lower part of the reactor, see appendix figure 1 , first contact the lower molecular sieve supported catalyst (reduction catalyst), and then enter the activated alumina supported perovskite catalyst (oxidation catalyst)...

Embodiment 2

[0049] Simulated gas composition: 2000ppm NO, 500ppm C 2 H 2 , 2000ppm CO and 5% O 2 At the initial concentration, He gas was used as the diluent gas. Combine 0.005 g of simulated carbon particles with 0.1 g of La 0.6 K 0.4 CoO 3 / Al 2 O 3 The catalyst was stirred evenly with a sample spoon and contacted loosely, and then filled into the upper layer of the quartz tube reactor, separated by quartz wool, and then filled with 0.1 g of W / HZSM-5. The catalyst was the same as in Example 1. In the temperature-programmed reaction, the experimental simulated gas was introduced from the lower part of the reactor. After the reaction, the maximum conversion rate of NO could reach 39%, and the combustion temperature of carbon particles was reduced by 187 °C (compared to Comparative Example 1), and the acetylene was completely converted. At a temperature of 339°C, the maximum selectivity of carbon dioxide combustion to carbon dioxide can reach 99.7%.

Embodiment 3

[0051] Simulated gas composition: 2000ppm NO, 500ppm C 2 H 2 , 2000ppm CO and 5% O 2 At the initial concentration, He gas was used as the diluent gas. 0.1 g of W / HZSM-5 (tungsten oxide loading 1%, molecular sieve with a silicon-alumina ratio of 25) was filled into the upper layer of the quartz tube reactor, separated by quartz wool, and then filled with 0.1 g of La 0.6 K 0.4 CoO 3 / Al 2 O 3 (50% loading, the specific surface area of ​​the activated alumina carrier is 147.9m 2 / g, pore volume 0.2793ml / g) catalyst, 0.005g simulated carbon particles were mixed with La 0.6 K 0.4 CoO 3 / Al 2 O 3 The catalyst is loosely contacted. In the temperature-programmed reaction, the experimental simulated gas is fed downward from the upper part of the reactor. After the reaction, the maximum conversion rate of NO can reach 15%, and the combustion temperature of carbon particles can be reduced by 214 °C (compared to Comparative Example 1). ), the temperature for complete conversio...

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Abstract

The invention relates to a composite catalyst capable of eliminating four main pollutants in diesel engine tail gas simultaneously and a method for purifying the diesel engine tail gas. The composite catalyst consists of an oxidation catalyst and a reduction catalyst, wherein the active components of the oxidation catalyst are selected from perovskite or similar perovskite composite oxides, and the reduction catalyst is an HZSM-5 molecular sieve modified by a transition metal oxide. The composite catalyst is filled into two catalyst bed layers in a constant temperature section of a reactor so that the diesel engine tail gas passes through the reduction catalyst bed layer and the oxidation catalyst bed layer and is warmed up to perform reaction, thus the aim of eliminating the pollutants of carbon particles, hydrocarbons, carbon monoxide, nitrogen oxide and the like simultaneously can be achieved. Because of the high efficiency oxidizing property and high efficiency reducing property, the used composite catalyst can purify the diesel engine tail gas under a comparatively mild condition.

Description

technical field [0001] The invention relates to a diesel engine exhaust gas purification technology, in particular to a combined catalyst and a purification method capable of simultaneously eliminating four major pollutants in diesel engine exhaust gas, belonging to the field of environmental protection. Background technique [0002] Since entering the 21st century, with the rapid development of my country's national economy, accession to the WTO and the approaching of the 2008 Beijing Olympic Games, it has become an urgent task to improve the atmospheric environment, control waste gas pollution, and create a "green Olympics". Diesel engines have always been favored by automobile manufacturers and are widely used in light and heavy vehicles due to their cost-effective advantages. my country also strongly supports the development of diesel vehicles in the "Eleventh Five-Year" plan of the automobile industry. The trend of automobile dieselization is unstoppable, and the number...

Claims

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Application Information

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IPC IPC(8): B01D53/94B01J23/16B01J23/70B01J29/48B01J29/46
Inventor 赵震许洁刘坚荆延妮段爱军姜桂元徐春明
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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