Because of the precious metals contained within, traditional catalytic converters have a high recyclable value. Platinum, palladium, and rhodium are the precious metals in discussion. The most valuable precious metal is rhodium, which has a market value of more than $13,000 per ounce. Each of these precious metals contributes substantially to the reduction of toxic emissions emitted by the inner workings of a gasoline-powered vehicle, but what about diesel vehicles?  

Because its function is not required, diesel catalytic converters do not contain the precious metal rhodium. Rhodium is the precious metal that catalyzes the reduction reaction in a three-way converter, which converts NOx into nitrogen gas and oxygen. Rhodium, however, cannot efficiently reduce NOx gases in a diesel converter due to the high oxygen content of diesel exhaust. As a result, rhodium is not present in diesel converters. 

Instead, the selective catalytic reduction system “SCR” in a diesel vehicle uses a component known as “diesel exhaust fluid” (DEF), which is composed of either urea or ammonia. Catalytic materials are still present in the SCR ceramic monolith, but they are typically not recyclable. NOx from the exhaust can be effectively removed using DEF and non-precious metal bearing catalytic materials. 

Diesel engines can be found in a variety of applications, ranging from personal transportation and commercial vehicles to heavy machinery and manufacturing. When purchasing diesel converters, there is an astounding range of sizes, configurations, and precious metal contents to be aware of. 

We can assist you whether you are looking to recycle diesel or gasoline engine catalysts. When it comes to recycling, we provide transparency and fair dealing. Contact us today to find out how we can assist your company!