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Industrial Pollutants: Knowledge Layer

Direct answer: This section profiles the pollutants this knowledge center is built around — NOx, CO, VOC (including benzene, toluene, xylene and formaldehyde) — as engineering entities: where each comes from, what properties matter for treatment, which materials and technologies apply, and where each treatment route fails. A pollutant profile is the input side of every selection decision on this site.

Why pollutant profiles matter

Every abatement decision starts with the pollutant, not the device:

  • The molecule (size, polarity, boiling point, functional groups) decides which materials can capture or destroy it.
  • The concentration and flow decide which technology is economical.
  • The co-pollutants (dust, humidity, sulfur, halogens) decide what kills the chosen material.

A "VOC" is not one substance — benzene, toluene and formaldehyde behave differently on the same catalyst, and a profile that ignores the difference mis-sizes the system.

Pollutant profiles

Pollutant Profile Primary technologies Primary materials
NOx Acid-forming combustion gas; NO + NO₂ SCR, SNCR V-Mo-Ti SCR catalysts
CO Toxic, flammable combustion intermediate Catalytic oxidation, thermal oxidation Precious-metal / base-metal oxidation catalysts
VOC Volatile organics class; hundreds of species Adsorption, catalytic oxidation, RTO/RCO, concentration wheels Activated carbon, zeolites, oxidation catalysts
Benzene, Toluene, Xylene (BTEX) Aromatic VOC subgroup; stable rings, adsorbs well, oxidizes at higher temperature Adsorption, catalytic oxidation Activated carbon, zeolites, Pd / Pt-Pd catalysts
Formaldehyde Small polar oxygenate; water-soluble, hard to adsorb on carbon Catalytic oxidation, wet scrubbing, adsorption on impregnated media Pt catalysts, impregnated carbon, oxidant scrubbers

How to use this layer

  1. Identify the pollutant from the process (see each profile's Industrial sources).
  2. Read its Relevant properties and Treatment challenges — these set the temperature, humidity and material constraints.
  3. Follow the links to Suitable materials and Suitable technologies, which carry the detailed design content.
  4. Check Limitations before committing to a route — every profile states what does not work and why.

Relationship to the rest of the knowledge center

Data discipline: physical constants in these profiles are standard chemical reference values (Literature Value); treatment performance ranges are Typical Value or are labeled with their data type. See Data Classification.