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Oxidation catalyst for diesel engine exhaust

An oxidation catalyst and diesel engine technology, applied in physical/chemical process catalysts, molecular sieve catalysts, catalyst activation/preparation, etc., can solve the problems of increasing the cost of diesel engine exhaust treatment, cumbersome catalyst devices, catalyst pressure drop, etc., and achieve post-treatment exhaust gas treatment. , The effect of improving sulfur resistance and reducing combustion temperature

Inactive Publication Date: 2014-06-18
SHANGHAI LANGT AUTOCATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst device is cumbersome and costly, which increases the exhaust gas treatment cost of the diesel engine
Moreover, the catalyst has a high pressure drop and requires high oil quality, so it is not suitable for diesel engine working conditions

Method used

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  • Oxidation catalyst for diesel engine exhaust
  • Oxidation catalyst for diesel engine exhaust

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1 prepares catalyst carrier

[0037] Put the cordierite honeycomb ceramics in an ultrasonic instrument for cleaning, add hydrofluoric acid during the cleaning process and adjust the pH to 2, the frequency is 50HZ, the power is 100W, and the ultrasonic cleaning time is 200min to obtain a catalyst carrier with a cleaner pore wall .

Embodiment 2

[0038] Embodiment 2 prepares catalyst carrier

[0039] Put the cordierite honeycomb ceramics in an ultrasonic instrument for cleaning, add hydrofluoric acid during the cleaning process and adjust the pH to 1, the frequency is 50HZ, the power is 100W, and the ultrasonic cleaning time is 400min to obtain a catalyst carrier with a cleaner pore wall .

Embodiment 3

[0040] Embodiment 3 Preparation of Diesel Engine Exhaust Oxidation Catalyst

[0041] Preparation of modified powder: Simultaneously modify γ-alumina with silica, titania precursor silica sol, and n-butyl titanate at a temperature of 150°C and a pressure of 10 MPa, in which silica, titania and The mass ratio of γ-alumina is 28:26:46;

[0042] Preparation of modified molecular sieves: modifying molecular sieves with a platinum nitrate solution with a mass concentration of 10%; wherein the weight ratio of platinum simple substance to molecular sieves in the platinum nitrate solution is 1:30; the silicon-aluminum molar ratio of the molecular sieves is 150;

[0043] Mix the modified powder, modified molecular sieve, polyvinyl alcohol and water according to the mass ratio of 45:30:1:80, carry out high-speed shear emulsification, and the shear speed is 150r / min, so as to obtain the coating colloid;

[0044] The coating colloid is added in the ammonium humate to age, the addition of ...

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Abstract

The invention discloses an oxidation catalyst for diesel engine exhaust. The catalyst adopts ceramic honeycomb cleaned by ultrasonic as a carrier. The catalyst is prepared by adding the ceramic honeycomb cleaned by ultrasonic into aged coating colloid, dipping and loading, drying the loaded ceramic honeycomb and calcinating. The catalyst can comprehensively treat discharge of carbon cigarette pellets and gaseous pollutants.

Description

technical field [0001] The invention belongs to the field of diesel engine tail gas treatment, in particular to a diesel engine tail gas oxidation catalyst. Background technique [0002] In the past 20 years, in the face of the pressure brought by the depletion of the world's oil resources to social development and the impact of the rapid increase in car ownership on the environment, the world's automobiles have been constantly looking for solutions to achieve sustainable development of the automobile industry. In the development of advanced technology, people have a newer and deeper understanding of diesel engines and diesel vehicles. Compared with gasoline engines, diesel engines are economical and powerful, but they have brought certain negative effects on environmental pollution. Compared with gasoline engines, the CO and HC emitted by diesel engines are only one-tenth of those emitted by gasoline engines, and the NO X Basically the same, but PM (carbon particulate matt...

Claims

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Application Information

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IPC IPC(8): B01J37/34B01J29/068B01D53/94
Inventor 张现龙姜瑞霞陈令伍管嘉林张蓓周坚刚
Owner SHANGHAI LANGT AUTOCATALYST
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