Diesel Emission Reduction Technology for On- and Offroad Vehicles
mobicleanTM R advanced is the compact system for exhaust gas aftertreatment for retrofit applications in the field of on- and offroad:
Ground Power Units
DPF Making the Right Choice
A retrofit with a diesel particulate filter (DPF, especially a VERT-DPF) offers a comprehensive elimination of diesel particulate matter emissions and black carbon soot by almost 100% and is the most effective solution for improving conditions outside the vehicle with basically zero tailpipe emissions.
Full Flow Diesel Particulate Systems against Smoke and Black Carbon
Only Full Flow Diesel Particulate Systems are an effective tool against smoke. Our mobicleanTM R advanced systems retain particles of the exceptionally dangerous zone of 20 - 300 nanometres.
Proven. Effective. Reliable
mobicleanTM R advanced Filter Systems are based on a ceramic honeycomb structure made of silicon carbide (SiC).
The exhaust gases flow through the porous walls between the channels that are blocked at alternate ends. During this process more than 99% of particles of all sizes will be deposited in the walls.
CARB- and VERT-certified.
Why mobicleanTM R advanced is the Better Solution
Regeneration temperature over 200℃ is needed in only 15% of the duty cycle (lowest in industry)
Fuel saving up to 6% (in comparison to commercially available diesel particulate filter)
Available for model years 1991-2006
Compatible with EGR engines
For light diesel, sulphur content up to 50 ppm
No need to push a button to regenerate
No need to plug in to regenerate
No infrastructure needed
Outstanding emission reduction results:
99% Particulate Matter (PM) reduction
90% Carbon Monoxide (CO) reduction
70% Hydrocarbon (HC) reduction
Up to 6% in fuel savings in comparison to commercially available diesel particulate filter
Choosing a mobicleanTM R advanced Filter System, your fleet can be assured of having the best available technology.
JUST A FYI - in the early 1980's - 1990's Johnson Matthey produced and designed a DOC in front of DPF filter made for low-temperature vehicles (aka) transit buses, MTA buses etc. stop and go and idle duty cycles. There were hundreds of thousands of these running without a problem. JM lost this patent in 2002 and HUG resigned the patent & now manufacture a similar two-stage CRT filter that is CARB approved for low-temperature duty cycles
Abstract: The CRT is a trade name for a two-stage catalytic, passive filter configuration. The CRT system utilizes a ceramic wall-flow filter to trap particulates. The trapped particulate matter is continuously oxidized by nitrogen dioxide generated in an oxidation catalyst which is placed upstream of the filter. The CRT requires ultra low sulfur fuel and a certain minimum NOx/PM ratio for proper operation.
Principle of Operation
The CRT filter is a two-stage passive diesel particulate filter system, where an uncatalyzed filter is regenerated using nitrogen dioxide (NO2) generated over an oxidation catalyst positioned upstream of the filter. By using NO2 to oxidize diesel soot - which was discussed in the paper on particulate filter regeneration - filters can be regenerated at relatively low exhaust temperatures. Indeed, on suitable applications and with the use of ultra low sulfur diesel fuel, the CRT filter is capable of regenerating at temperatures as low as 250-300℃.
"CRT" - an abbreviation for the "Continuously Regenerating Technology" trade name, originally introduced as "Continuously Regenerating Trap" is a registered trademark of Johnson Matthey, whose researchers first described the use of NO2 for soot oxidation [Cooper 1989]. This type of filter is also referred to as the CR-DPF, which stands for “continuously regenerating diesel particulate filter. The CRT filter configuration was patented by Johnson Matthey in the USA [Cooper 1990] and in other countries, followed by market introduction in retrofit applications in the late 1990s, and as OEM system in the 2000s. As the patents expire in the late 2000s, this type of filter system will be available from a number of suppliers.
A schematic of the CRT configuration is shown in Figure 1. The filter system is composed of two devices—an oxidation catalyst (upstream) and a ceramic wall-flow diesel filter (downstream).
As it is the case with regeneration of all passive filter systems, the CRT operation depends on the vehicle's duty cycle. A successful passive operation of the filter requires that the exhaust gas reaches a sufficient temperature and meets certain conditions, as discussed below. The regeneration of the system can be enhanced, within certain limits, by increasing the size of the catalyst and the filter and/or by increasing the noble metal loading in the catalyst. Nevertheless, if the application is unsuitable or the duty cycle is too cold, the filter may be plugged with soot or experience uncontrolled regenerations.