Environment-friendly three-element catalytic detergent

Abstract

The invention relates to an environment-friendly three-element catalytic detergent. The detergent is at least prepared from the following components by weight percent: 0.5 to 0.8 percent of hydrochloric acid, 10 to 20 percent of EDDS, 6 to 15 percent of cleaning agent, 5 to 10 percent of scale and corrosion inhibitor, 5 percent of co-solvent and deionized water, wherein the sum of the weight percent of the hydrochloric acid, the EDDS, the cleaning agent, the scale and corrosion inhibitor, the co-solvent and the deionized water is 100 percent. The three-element catalytic detergent disclosed by the invention can primarily clean an engine which is completely blocked and cannot be started at normal temperature to remove the sulfur and phosphorus complex and accumulated carbon deposit, so that the engine can be started, then the engine is started to be secondarily cleaned at an idle speed at high temperature so as to regenerate a precious metal catalyst, and an effect for thoroughly and effectively cleaning a three-element catalytic converter is achieved; and moreover, components used in the three-element catalytic detergent are good in biodegradability, and the three-element catalytic detergent is an environment-friendly three-element catalytic detergent.

Description

technical field [0001] The invention relates to the field of cleaning agents, in particular to the preparation of an environment-friendly three-way catalytic cleaning agent. Background technique [0002] With the rapid development of economy, my country has become the second largest automobile market and the third largest automobile manufacturing base in the world. In the past 10 years, the average growth rate of China's automobile production has been around 13%. It is estimated that by 2020, the total number of automobiles in my country will exceed 150 million. The development of the automobile industry has brought serious environmental problems, and automobile exhaust pollution accounts for 60-70% of the entire air pollution. A large number of vehicle exhaust emissions have caused a wide range of haze weather and photochemical smog, seriously affecting people's travel and health. [0003] The three-way catalytic converter is the most important external exhaust gas purif...

AI Technical Summary

Problems solved by technology

The temperature at which the rare and precious metals start to work in the three-way catalytic converter is about 200°C, and the best working temperature is 400-800°C. After exceeding 1000°C, the rare and precious metals used as catalysts will also undergo chemical changes, thus making the car The effective catalyst composition of the three-way catalytic converter grid is reduced, and the catalytic effect is weakened

[0004] When the car is used for a long time, the sulfur in the fuel, the phosphorus and zinc in the lubricating oil, and the incomplete combustion of the fuel will cause the poisoning and deactivation of the three-way catalyst, especially the middle and low-grade lubricating oil and low-quality fuel containing sulfur, phosphorus, etc. There are more harmful impurities, which are more likely to cause three-way catalyst poisoning and deactivation

On the other hand, the engine of the car is idling due to road congestion, or when the car is running at a slow speed, or the driving conditions are poor, the ignition time of the engine is too late due to a fault, or some cylinders misfire and do not work, or the fuel injection is normal but difficult to start, mixed Phenomena such as too thick gas, engine burning oil, etc., will cause colloidal carbonization and carbonization in the intake and exhaust of the car engine and the fuel system

However, the colloidal deposited carbides can easily block the three-way catalytic converter of the automobile and adsorb on the active surface of the catalyst to form chemical adsorption complexes, causing catalyst deactivation

Catalyst deactivation caused by incomplete combustion of phosphorus, sulfur and fuel oil can be recovered under certain conditions, but the recovery rate of precious metals in the three-way catalytic converter is low; on the other hand, platinum, rhodium, Palladium is a precious metal, and if the catalyst is added again, its cost is higher

[0005] For this reason, Chinese patent CN201410039967.0 discloses a kind of three-way catalytic converter cleaning agent and preparation method thereof, wherein the active ingredient of the disclosed three-way catalytic converter cleaning agent is an organic weak acid and EDTA, and the organic weak acid has a certain effect on the three-way catalyst. regenerative ability, but when the platinum catalyst is partially oxidized, organic weak acids cannot function at all

EDTA is currently a widely used metal complexing agent, which can form complexes with many metals. However, EDTA has strong stability and is difficult to biodegrade in the environment. It may release metal ions to the external environment and cause environmental pollution.

Chinese patent CN101982542A discloses a special cleaning agent for three-way catalytic converters of automobiles, which only cleans three-way catalytic converters in one step at room temperature, and can only remove adsorbed sulfur, phosphorus and other complexes, and cannot regenerate the catalytic activity of precious metals themselves.

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