Patent and Technology - RHT
page-template-default,page,page-id-10380,theme-sparks,mkd-core-1.0.3,woocommerce-no-js,sparks-ver-1.6,mkd-smooth-scroll,mkd-smooth-page-transitions,mkd-ajax,mkd-grid-1300,mkd-blog-installed,mkd-header-standard,mkd-fixed-on-scroll,mkd-default-mobile-header,mkd-sticky-up-mobile-header,mkd-dropdown-animate-height,mkd-light-header,mkd-header-style-on-scroll,mkd-full-width-wide-menu,mkd-header-standard-in-grid-shadow-disable,mkd-search-dropdown,mkd-woocommerce-columns-4,wpb-js-composer js-comp-ver-6.8.0,vc_responsive,currency-hkd

Patent and Technology

Invented in Hong Kong

RHT upholds the principle of maintaining local production. Besides cooperating with local professionals, it collaborates with experts from well-known universities overseas to introduce advanced technology into Hong Kong to increase the competitiveness of local innovative scientific products.

What is NCCO?

Nano-Confined Catalytic Oxidation (NCCO) is a new air treatment system produced to solve the issues in air purification technologies commonly used in the market. These technologies include activated carbon, photocatalyst and negative ions.
For instance, activated carbon filters have a service life from 2 to 3 months. Once saturated, pollutants will be released back into the air. The higher frequency of filter replacements increases both the cost of use and production levels from manufacturers, causing a negative impact on the environment.

Nano Confined Catalytic Oxidation(NCCO)air treatment technology is developed by a partner of Hong Kong Science Park, RHT Industries Limited, in collaboration with the member of the Entrepreneurship Program of the Hong Kong University of Science and Technology.

The core structure of this unique air treatment technology is an active oxygen generator combined with NCCO Reactor. The active oxygen has been emitted from the generator and can effectively kill bacteria and viruses, as well as destroy the molecular structure of harmful chemicals.

The NCCO Reactor consists of a large amount of granular catalysts, which are man-made mineral that contain nanotubes made of transition metals.

NCCO air treatment technology focuses on the decomposition of pollutants instead of its adsorption, therefore no secondary pollution will be caused and the filter can be used for a long period of time.

The laboratory has proven that NCCO Reactor could be applied for up to 12 years for sterilization and decomposition of harmful substances.

Most air purifying systems in the market target short-term benefits with disregard of sustainability. Activated carbon filters have a short service life (months) with the discarded filters and process of replacing such filters created pollutive industrial waste, putting pressure on the environment. NCCO truly resolves these problems, and this technology achieves impressive adsorptive, decomposition and cleansing action within the air purifying system. It’s a safe, sustainable and eco-friendly option.

Theory of NCCO

NCCO – Nano Confined Catalytic Oxidation is able to convert VOCs (Volatile Organic Compounds) and Formaldehyde to harmless CO2 and H20 molecules. This technique involves the use of ‘contained’ ozone in combination with zeolites (crystalline solids with uniformly-sized, nano-scale pores) and other related porous materials. In contrast to ozone generators, which directly release the toxic gas into the environment and are known to be ineffective, NCCO greatly enhances the oxidation of contaminants while avoiding high emission of ozone and harmful reaction intermediates. The zeolites consist of a negatively-charged aluminosilicate framework with loosely bound cations that maintain the charge balance. A number of natural and synthetic zeolites with varying chemical compositions have been exploited for different commercial applications. Zeolite filters can be used in air purification for the adsorption of gaseous pollutants Interestingly, zeolites also have the ability to catalyze diverse reactions inside the nanosized pores . NCCO is based on a catalytic ozonisation mechanism where ozone (O3) provided by an upstream ozone generator is decomposed into molecular oxygen (O2) and active atomic oxygen (O*) at acidic sites of the adsorbent. Gaseous pollutants e.g. VOCs that are adsorbed in the same pore as O* undergo catalytic oxidation within the confined nano-cavity. Previous studies show that reaction intermediates remain in the adsorbent, while the smaller final products (such as carbon dioxide and water) are generally released to regenerate the catalyst. Based on the catalytic process, the life of the NCCO filter has an extremely long functioning and performance life.

Advantages of NCCO

  • Super powerful decomposition of medically harmful gaseous pollutants such as formaldehyde, xylene, benzene, acetone and phenol
  • Does not release secondary pollutants compared to traditional adsorbent materials such as activated carbon
  • NCCO reactants are recyclable and self-sustaining thus can be reused repeatedly, providing significant savings in labour and running costs
  • Uses mineral material as reactant and so preserves the external environment

Benefits of NCCO

  • Disinfects and Deodorises – Improves hygiene in critical areas
  • Reduces the number of air changes – Provides running cost benefits
  • Removes TVOCs – Reduces effects of medically harmful fume pollutants
  • Protects health of employees – Provides better working environment and increases in productivity
  • Kills bacteria and viruses e.g.H3N2 – Provides significant protection to individuals
  • Maintains good air quality – Provides a better living atmosphere and environment
  • Collects allergens – Using HEPA Filter (HEPA 13 – Medical Grade), reduces allergic reactions
  • Prevents inhalation of suspended particulates e.g.PM2.5 protection, improving Indoor Air Quality (IAQ) to EXCELLENT class
  • Removes smoke and harmful fumes –Providing personal and commercial benefits


Our NCCO technology has been tested by Internationally accredited authorities, proving excellent pollution removal power and effectiveness when an environment is exposed to – Formaldehyde, TVOCs, Ammonia, Ozone, Respirable Suspended Particulates, Airborne bacteria and influenza virus removal H3N2.

Our units are also certified to CE compliance of the following European directives;

LVD – Low Voltage Directive – 2014/35/EU
EMCD – ElectroMagnetic Compatibility Directive – 2014/30/EU
RoHS – Restriction oHazardous Substances Directive – 2015/863 (RoHS 3)
We are a registered ISO 9001:2015 Company