Legal analysis: illegal. The three-way catalytic converter belongs to hazardous waste, which is a big pollution to the environment. Only recycling companies with relevant qualifications can recycle the catalytic converters, and it is illegal to sell them privately. So if you are a car owner, just keep an eye on your catalytic converter and leave the rest of the work to the end-of-life auto dismantling companies.
Legal basis: "The Chinese People's **** and State Environmental Protection Law" Article 42 of the pollutants emitted by enterprises, institutions and other producers and operators, shall take measures to prevent and control the production and construction or other activities in the production and construction of waste gas, waste water, waste residue, medical waste, dust, malodorous gases, radioactive substances, as well as noise, vibration, optical radiation, electromagnetic radiation and other pollution and harm to the environment. . Enterprises and institutions discharging pollutants shall establish a responsibility system for environmental protection, and clearly define the responsibilities of unit heads and relevant personnel. Key emission units should install and use monitoring equipment in accordance with relevant state regulations and monitoring specifications to ensure the normal operation of monitoring equipment, and save the original monitoring records. It is strictly prohibited to discharge pollutants illegally through concealed pipes, seepage wells, seepage pits, irrigation or tampering, falsification of monitoring data, or improper operation of pollution prevention and control facilities to avoid supervision.