From Which National Emission Standard Did the Three-Way Catalytic Converter Start?

[DeHadley]

The three-way catalytic converter started from National Emission Standard III. Below is a detailed introduction to the three-way catalytic converter: 1. Introduction: The three-way catalytic converter is the most important external purification device installed in the automobile exhaust system. It can convert harmful gases such as CO, HC, and NOx emitted by automobile exhaust into harmless carbon dioxide, water, and nitrogen through oxidation and reduction. When high-temperature automobile exhaust passes through the purification device, the purifying agent in the three-way catalytic converter will enhance the activity of the three gases CO, HC, and NOx, promoting certain oxidation-reduction chemical reactions, in which CO is oxidized at high temperature to form colorless, non-toxic carbon dioxide gas. 2. Principle: The three-way catalytic reactor is similar to a muffler. Its exterior is made of double-layer stainless steel thin plates formed into a cylindrical shape.

[MacEmery]

I remember that the three-way catalytic converter became mandatory in China starting from the National III emission standards, around 2007. At that time, emission control was strengthened, requiring new vehicles to be equipped with this device to treat carbon monoxide, hydrocarbons, and nitrogen oxides in the exhaust, converting them into harmless carbon dioxide and water. During the National I and National II eras, the standards were less strict, and some automakers only installed simple mufflers or even skipped the catalytic converter entirely. Nowadays, with rapid advancements in automotive technology, catalytic converters have become essential, but their maintenance costs are not low—repairs can run into thousands of yuan if they fail. Drivers should regularly check them to avoid issues during vehicle inspections. In short, the National III standards drove the widespread adoption of this device, contributing significantly to reducing urban air pollution.

[Dawn]

As an environmental advocate, I understand that the key point of introducing three-way catalytic converters was the National III emission standards. Around 2007 when they were implemented, this marked an upgrade in automotive exhaust treatment, with new regulations mandating the installation of catalytic converters in all new vehicles to target the conversion of three major pollutants. Compared to the earlier National I or II standards, emission limits were lax back then, leading to higher pollutant emissions and worsening urban smog. After the widespread adoption of catalytic converters, air quality improved, promoting green transportation. In fact, this system is quite sophisticated, involving chemical conversions, and subsequent standards like National VI have further enhanced efficiency. Car owners should value its functionality and avoid using low-quality fuel to extend its lifespan.

[FaithFitz]

When I bought my first car, I researched that the three-way catalytic converter became mandatory starting from the China III emission standard. The China III standard was officially implemented in 2007, requiring car manufacturers to install catalytic converters during production to primarily control exhaust emissions. Models meeting China I and China II standards might not have this component, often resulting in smelly exhaust and higher chances of exceeding emission limits. The core of the catalytic converter is a catalytic chamber that transforms harmful gases into harmless substances, but it can get clogged or burned out if not properly maintained during daily driving, affecting performance. Nowadays, new cars comply with the China VI standard, featuring more advanced technology. My driving instructor mentioned this during lessons, emphasizing the importance of regular maintenance.

[StHadley]

Having worked in the automotive repair field for a long time, I know that the mandatory era of catalytic converters began with the National III emission standards. Since 2007, new vehicles must be equipped with them upon leaving the factory. Catalytic converters are crucial for treating exhaust pollutants, such as carbon monoxide and nitrogen oxides. During the National I or National II era, some older vehicles lacked this device, leading to many exhaust issues. In repairs, catalytic converter failures are common—if they get clogged or the metal fails, the vehicle will fail emissions tests, and replacing the parts is costly. It's recommended that car owners regularly clean carbon deposits and avoid using low-quality fuel. The evolution of emission standards has driven this change.

[Genevieve]

As a member of society, I care about how three-way catalytic converters help improve environmental health. They were widely adopted starting from the China III emission standards, and around 2007, new regulations required vehicles to be equipped with catalytic converters to reduce exhaust pollution. Compared to the more lenient emissions during the China I and China II periods, the higher levels of harmful gases affected respiratory diseases. The catalytic converter purifies the air through chemical reactions, but over time it may age and fail, creating maintenance burdens. The promotion of China III standards raised public awareness of environmental protection, leading us toward cleaner roads.