Principles of Action

Volatile air pollutants

Filter

Unpolluted
contaminated air

Reactive Filter

Contaminants are captured by the filter (irreversibly absorbed, converted into harmless, non-volatile products).

AIR TECH GROUP, S.L.U. – Research and Development

Nitrogen oxides (NOX)
Know-how on NOX elimination, at room temperature

Formaldehyde (methanal, CH2O) and other volatile aldehydes
2 patents

  • Air filter for removing aldehyde-like VOCs from indoor air, PCT/EP2019/068116, WO2020/008041
  • A filter and a method for removing aldehyde-like VOCs from indoor air, PCT/EP2020/082639, WO2021/129985

Sulfur dioxide (SO2)
Know-how on SO2 elimination

Organic Sulfur Compounds
WO 2025/233539 A1

  • Filter System for the Removal of Volatile Organosulfur Compounds (VOSCs) from Indoor Air

Volatile Organic Compounds (VOCs or VOCs, various groups)
In R&D phase

Carbon monoxide (CO)
In R&D Phase

Interpretation of the formaldehyde molecule
Formaldehyde

Removal of formaldehyde (CH2O) and other aldehydes.

  • Our patent-protected decontaminant material is a mixture of diphenols and triphenols and an acid catalyst.
  • Examples of use: this material, in the form of an ATG filter, can be incorporated into a simple purifier; our absorbent can also be added to an activated carbon filter commonly used in air purifiers.
  • Formaldehyde (gas given off by formica furniture, parquet and resins, formaldehyde/formaldehyde solutions or paraformaldehyde polymer) and other aldehyde vapors react at room temperature with AIR TECH’s patented absorbent to give a stable, non-volatile product (a polymer).
  • The product can be raw material for industry (not waste).
  • No by-products or co-products are generated.
  • High conversions (high reaction yields) are obtained.

Our Results / CH2ORemoval

Tested in real conditions of use, our filter reduces the concentration of formaldehyde to below legal (WHO) limits of 0.03 ppm.
Interpretation of a trapped formaldehyde molecule
Line graph showing the progressive reduction of formaldehyde in a 20 m³ booth. At 0 minutes the concentration is 1.8 ppm, dropping to 1.0 ppm at 20 minutes, 0.5 ppm at 40 minutes, 0.2 ppm at 80 minutes and almost 0 ppm at 120 minutes.

The method for decontamination of formaldehyde and other volatile aldehydes has been patented:

WO 2020/008041 and WO 2021/129985

The technology has been developed by a research group at the University of Barcelona (Organic Chemistry laboratories).

The efficiency of the method has been certified by an independent company, SGS Spain (Madrid), in January 2025.

There are other patent applications in progress, in collaboration with the same research group at the University of Barcelona.

AIR TECH GROUP has its own testing facilities -conveniently equipped cabin/container- in Sarral (Tarragona).

AIR TECH GROUP has extended the above patents to several countries (USA, Brazil, Japan, China, South Korea and several European countries).