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Noxtech Product Overview


Back to Top  Noxtech® Technology

The Noxtech® technology was developed over nine years with an investment in excess of $30 million of R&D capital. Noxtech's air emission control products utilize the Noxtech® technology. This process achieves extremely high removal percentages (90-98%) of NOx from combustion gases, superior to the best commercial systems which use Selective Catalytic Reduction (SCR). Noxtech®'s principal advantages over competing technologies are:

Bullet  Greater than 90% NOx reduction for stationary combustion sources
         Bullet  Diesel and natural, landfill and biogas fueled IC engines
         Bullet  Coal & oil fired boilers
Bullet  Substantial concurrent depletion of CHX, CO, Particulates & NH3
Bullet  No generation of hazardous by-products
Bullet  Uses available fuel & agriculture grade urea
Bullet  No solid catalysts to replace or used catalyst requiring disposal
Bullet  Lower urea costs since the Noxtech System can use agricultural grade urea
Bullet  Simple system to operate and maintain means lower maintenance costs
Bullet  Noxtech System’s performance not affected by the impurities (siloxanes) and poisons in biogases
Bullet  System operates at low back pressure enhancing engine operating efficiency
Bullet  System is durable and reliable. It has no catalysts and utilizes simple construction from durable materials

The Noxtech® system relies on the injection of a chemical reagent (urea or ammonia) into the exhaust of an IC engine or boiler. The active chemical reacts with NOx within a well-defined temperature window created by heating the exhaust to 1400-1500 degrees Fahrenheit. The NOx and the reagent react to form innocuous gases: nitrogen, water vapor and carbon dioxide. The chemical reagent used in the Noxtech® process is completely safe. Treating exhaust with the Noxtech® process generates no toxic or unacceptable by-products. It also significantly reduces hydrocarbons, particulates and carbon monoxide.

The Noxtech® technology was first applied to diesel engines, however it is equally applicable, based on similar exhaust chemistry, to other combustion devices (digestor, landfill and natural gas fueled IC engines) including utility and industrial boilers.

Back to Top  Noxtech® System

The Noxtech® system brings internal combustion engines and boilers into compliance with NOx emissions control regulations. In addition to the capability for more that 90% NOx reduction, emissions of gaseous organic, particulate matter, and carbon monoxide are also reduced by greater than 90%. These emissions reductions meet even the most stringent regulations for new and existing combustion equipment. The treatment level can be customized to meet the needs of specific regulations.

Back to Top  Ease of Permitting

Based on its commercial performance, the Noxtech® System has demonstrated it can meet the most stringent emissions requirements for existing and new air emissions sources. Specifically, the Noxtech System has demonstrated it can meet the emissions levels as required by the South Coast Management District (SCAQMD) Rule 1110.2 as amended and in effect February 1, 2008 for NOx, CO, VOCs and ammonia slip. Noxtech plans to apply for BACT status based on its demonstrated performance. Therefore, it is anticipated that construction and operating permits can be obtained with a reasonable effort for both existing and new landfill, digestor and natural gas and/or diesel powered IC engine systems.The Noxtech® System generates no unacceptable gaseous, liquid, or solid byproducts.


The Noxtech
® Process

The Noxtech® system chemically treats exhaust gases using urea or ammonia as a chemical reagent.. Supplemental fuel is added to maintain a reaction temperature of 1400-1500 F. The Noxtech® system does not use a catalyst. The non-catalytic treatment selectively removes NOx, particulate matter, and gaseous organics.

Fuel consumption is minimized by recovering (55-70%) heat released for temperature control. This heat recovery is incorporated into the design of the Noxtech® System for internal combustion engines. In boiler applications, existing tube banks recover the released heat. The liquid chemical injection is controlled continuously to maintain emissions compliance levels. A simple, cost-effective PLC control system reliably maintains both the reaction temperature and emissions levels over the normal operating load range of combustion equipment. The PLC control system also performs diagnostic monitoring of the Noxtech System to assure safe effective operation and performance.

Back to Top  Commercial Applications




The Noxtech® System is applicable to diesel and lean-burn digestor, landfill and natural gas engines as well as to boilers. Both new and retrofit systems are available. The equipment is easily retrofitted into existing exhaust systems. For internal combustion engines the Noxtech® System is installed inline into the exhaust flow. In heat exchange boilers, the Noxtech® System is installed in existing cavities between convective tube banks. A Noxtech® System installation requires no major modifications and does not derate combustion equipment.

Back to Top  NOx Reduction Costs

The price of a Noxtech System will vary with the application and specific site requirements. Typically however, installation costs are less than comparable catalyst based systems. In addition, the operating costs for a Noxtech System is lower than that of a comparable catalytic system since Noxtech does not contain catalysts that must be replaced. It is relatively simple and low cost to operate and maintain and it can use lower cost agricultural grade urea. The Noxtech System does not require a costly front end gas clean up system for biogases and is not affected by typical exhaust contaminants that plug or poison catalysts.

Noxtech® installations may be able to cost-effectively generate emissions credits or offsets depending upon the installation details and the emissions rules governing the operating site. A single installation may facilitate compliance planning for an entire site which is bubbled under emission regulation, that would allow the site to avoid being ruled a “major source”. Plant sites can benefit from emissions credits for carbon monoxide, particulate matter, and gaseous organics as well as NOx.

Back to Top  Modular Installation

Noxtech® equipment is supplied as a fully assembled unit for installation by the customer. Installation primarily involves the mounting of equipment and the connection of fuel, chemical, and air lines along with the electrical control signals. Noxtech is willing to provide the urea storage and supply system as an option.

Back to Top  Experience and Warranty

Noxtech®, Inc. will warrant its equipment to be free from defects in material and workmanship and to maintain emissions compliance during normal operations. The Noxtech® performance is based on considerable operating experience for stationary IC engines systems ranging of 150kW to 2.0MW. Noxtech’s System has demonstrated excellent performance with exceptional operational reliability.

The Noxtech® warranty is backed by the technical and financial resources of Noxtech® Inc. Located in Costa Mesa, California. Noxtech®, Inc. is dedicated to the development and commercialization of low-cost pollution control technologies. The Noxtech is continuously working to improving the performance and effectiveness of the Noxtech® System while expanding its application to different combustion equipment.

Back to Top  Advanced Noxtech vs Competing Technologies

NOx Control for Boilers - Competitive System Comparison

Neither the SNCR nor Low NOx Burners work for IC Generators




% NOx removal



By-product emissions: NH3, CO, (NH4)SO4

Can all be controlled to very low levels

Major problem controlling NH3 slip – limits NOx reduction

Time and costs

2-3 weeks at reasonable cost

2-3 months major cost and down time

Ease of use/maintenance

Low maintenance/ simple to use (fully automated)

High maintenance requirements (catalyst replacement complex)

Generation of toxic materials


Used catalyst is a toxic material (expensive to dispose of)

Reduction of generator output (derate)



Deterioration of operating performance with time


Replacement every 2-3 years

Biogas cleanup requirement

Requires no cleanup

Requires expensive complex cleanup system

Back to Top back to top Competing Technologies Experience and Warranty Modular Installation NOx Reduction Costs Commercial Application Ease of Permitting Noxtech System Noxtech Technology


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