Baumot BNOx System
BNOx System


The BNOx system is a retrofit solution which lowers nitrogen oxides (NOx) by more than 90% under real driving conditions (RDE).

The emission values BNOX achieves under real driving conditions in retrofitted vehicles of pollution class EURO 2 and higher are better than those of the current EURO 6 category. In the future, this will qualify your vehicle for the forthcoming Ultra Low Emission Zones (ULEZ).

How it works

The BNOx system comprises a BNOx (ammonia) generator that meters the NH3 gas directly into the exhaust line. As a result of this operating principle, no function-critical hydrolysis in the exhaust gas stream is required (unlike other conventional SCR systems).

BNOx is CVRAS approved

Our BNOx system is approved by the Energy Saving Trust (EST) on the Clean Vehicle Retrofit Accreditation Scheme (CVRAS). This certification scheme supports the operation of Clean Air Zones (CAZs) and addresses the air pollution emissions from buses, coaches, heavy goods vehicles, mini-buses and vans. Read more on BNOx CVRAS

Emission tracking & reporting

Helping fleet operators manage vehicles, we offer a system to monitor exhaust aftertreatment system installed on a vehicle and the NOx reduction performance in real time. You have 24/7 access to tracking the vehicle and real-time information of the NOx emissions.

BNOx At a glance

  • Effectiveness proven in ADAC EcoTest
  • Meets “Real Drive Emissions” requirements (Euro 6c)
  • NOx reduction rates of 95% possible
  • “Real Drive” NOx emissions are reduced by 94%
  • Reduction of particulate emissions by more than 99%
  • Highly efficient SCR system, optimised for cold engine running conditions
  • The system functions already from an exhaust gas temperature as low as 150°C (vs. 220°C)
  • Takes up less space due to compact design
  • No deposition of AdBlue in the exhaust system
  • Certified according to Millbrook (UK); TÜV (DE) and EPA (USA) under verification

BNOx Presentation
  • 1. ULEZ Solution
    The Solution
    The Baumot BNOx System

    With the BNOx system, the Baumot Group offers a retrofit solution that lowers nitrogen oxides by more than 90% under real conditions (RDE1). The emission values it achieves under real conditions in retrofitted vehicles of pollution class EURO 2 and higher are better than those of the current EURO 6 category. In future, this would enable you to qualify your vehicle for the ULEZ3.

    Standard SCR System
    BNOx System
    BNOx Nachrüstkit
    BNOx System
    Figure 2: Reduction of nitrogen oxide under real conditions (= low exhaust temperatures) by more than 90%

    The diagram on the left shows that with a standard SCR system, effective NOx conversion occurs only at exhaust temperatures above about 220°C. Such temperatures are achieved only rarely, if ever, under real conditions in on-road operation, however. From the diagram on the right, it is clear that the BNOx system can already achieve a significantly greater NOx reduction at lower exhaust temperatures. Among other benefits, this makes it possible to significantly reduce nitrogen oxide emissions by up to 94% during on-road operation, even at low exhaust temperatures (starting from approx. 150°C).

    The high nitrogen oxide reduction rate at low temperatures is especially important to the automotive industry, because in future, testing must also be carried out under real road conditions (RDE1) with a PEMS2 measurement device (EURO 6c). In those tests, the prevailing exhaust gas temperatures are significantly lower than with the previous test stand methods.

    This means that the BNOx system already meets future legal requirements for on-road measurements (EURO 6c) today. With the BNOx system, passenger cars of pollution class EURO 2 or higher can comply with at least EURO 6 emissions limits.

    This has been proven in multiple independent trials.

    In collaboration with global OEM customers, the system was developed for series production and expanded under strict quality standards into a dependable, compact exhaust purification system for original equipment and retrofit applications.

    1 RDE, Real Driving Emissions
    2 PEMS, Portable Emissions Measurement System
    3 ULEZ, Ultra low emission zones

  • 2. Case Study
    Case Study
    DUH6 Tests on a retrofitted VW Passat B7 1,6 TDI (EU5)

    This diagram shows the nitrogen oxide (NOx) emissions of a passenger car tested according to pollution class EURO 5 standards under laboratory conditions. Two different test cycles were used: the current EURO 6 test method (WLTC1, test stand) and the EURO 6c RDE2 cycle, which will apply from September 2017. (PEMS3, on-road).

    Along with the BNOx system, the upgrade included the installation of existing VW EURO 6 series production components from the original VW spare parts catalogue4Bars 1 and 4 indicate the NOx exhaust gas values (0.68 g/km and 0.079 g/km) under the new EURO 6 test method, WLTC1. Bar 1 shows that according to the WLTC1 method, the EURO 5 vehicle emits over seven times more nitrogen oxides  (0.68 g/km) and is therefore far above the EURO 5 limit of 0.18 g/km under real conditions. Bar 4 shows the same test where the vehicle was retrofitted with the BNOx system. The NOx emissions are reduced to  0.079 g/km and achieve, by comparison, an NOx reduction of 88,4 % under real conditions in the WLTC1 test. Bars 2 and 5 show a PEMS3 measurement without  (1.03 g/km) and with BNOx  (0.069 g/km) according to EURO 6c approval procedures in Berlin. An NOx reduction of 93.3 % is achieved there with the BNOx retrofit kit.

    For comparison purposes, bar 3 shows the NOx emissions (0.118 g/km) of a comparable EURO 6 vehicle5. Versus the EURO 5 vehicle with BNOx system (0.069 g/km), it emits nearly twice the quantity of NOx.

    From this, it is clear that the retrofitted EURO 5 vehicle complies with the EURO 6 limit values, also under real conditions.

    As the results show, the BNOx retrofit kit makes it possible to retrofit EURO 5 passenger cars and comply with EURO 6 limit values even under real conditions.

    BNOx System Diagram 3: Real NOx emissions in comparison (DUH)
    limit NOx [g/km]
    Test cycle NOx emissions [g/km] NOx emissions
    w/o BNOx [g/km]
    NOx reduction
    with BNOx
    1 EURO 5 0,18 WLTC1 0,68 - -
    2 EURO 5 0,18 PEMS3 1,03 - -
    3 EURO 6 0,08 PEMS3 0,228 - -
    4 EURO 5 0,18 WLTC1
    with BNOx
    0,079 0,68 -88,4 %
    5 EURO 5 0,18 PEMS3
    with BNOx
    0,069 1,03 -93,3 %
    table 1: Detailed NOx emissions
  • 3. Feasibility Study
    Feasibility Study

    Passenger cars Commercial vehicles Busses
    Number of EU 5 / EU IV vehicles
    (25% of the stock in germany)
    aprox. 1'370'000 aprox. 25'000 aprox. 5'000
    Cost retrofit system aprox. 2'000 €/ System aprox. 12'000 €/ System aprox. 12'000 €/ System
    Total cost - Retrofit 2'740 Mio € 300 Mio € 60 Mio €
    External cost - environmental damage caused by NOx 15'400 €/t 15'400 €/t 15'400 €/t
    NOx emissions (current) aprox. 28'000 t/year (total) aprox. 5'400 t/year (total) aprox. 3'000 t/year (total)
    NOx Reduction by BNOx 90% 90% 90%
    NOx emissions after BNOx retrofit aprox. 2'800 t/year (total) aprox. 540 t/year (total) aprox. 300 t/year (total)
    Total damage caused by NOx aprox. 431 Mio €/year aprox. 83 Mio €/year aprox. 46 Mio €/year
    Cost savings by BNOx retrofit aprox. 388 Mio €/year aprox. 75 Mio €/year aprox. 41 Mio €/year
    Amortisation after
    2'740 Mio € / 388 Mio € = 7,06
    8 years
    300 Mio € / 75 Mio € = 4
    4 years
    60 Mio € / 41 Mio € = 1,46
    2 years

    Source: Data refers to numbers from the report "Umfassende Bewertung zu marktverfügbaren fahrzeugseitigen NOX-Nachrüsttechnologien" of the federal environmental agency
    NOx: Common abbreviation for nitrogen oxides (NO or NO2)

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