Photocatalysis: No longer an emerging technology but a recognized contributor to fighting pollution and removing dirt

Cristal has seen a steady, growing demand for its CristalACTiV™ range of TiO2-based photoactive colloidal suspensions (sols) and powders over the past few years and has reasons to believe this growth may accelerate in the future.

David Williams, the Global Business Manager for the CristalACTiV™ technology shares, “We are seeing increasing interest from all parts of the world in our TiO2 products and patented technologies for photoactive coatings and transparent treatments. These can provide self-cleaning and anti-polluting benefits in urban environments in a cost effective and complementary manner to traffic restrictions and the gradual move to electric powered transport.”

In 2018, Cristal added two new developments to its already comprehensive range of sols and powders with a fully transparent colloidal suspension for glass and metal cleaning formulations, and an easier dispersing form of the well-established CristalACTiV™ PC-500 high surface area TiO2 powder for coatings applications.

Following some concerns from government bodies about the effectiveness of TiO2-based photocatalysis as a practical air depolluting option, Cristal commissioned an extensive, independent review and evaluation of the technology. The review’s conclusions were that results from 12 large-scale installations carried out in cities as diverse as London, Rome, Copenhagen, Manila and The Hague, together with modelling studies and a cost benefit analysis, suggest that correctly formulated photocatalytic materials, when deployed at scale, do have a meaningful and measurable effect in reducing NOx levels in a highly cost efficient manner. This is consistent with Cristal’s own experiences based on seven field installations it has conducted over the years. CristalACTiV™ products also have been evaluated by recognized independent photocatalysis testing houses, and their results support our belief that Cristal can offer its customers “best-in-class” photoactive TiO2 sols and powders for most applications.

Finally, Cristal is managing a major field trial of its photocatalytic products in the UK, gathering data from a wide range of air pollution monitors. The aim is to confirm results and conclusions from all of its previous trials. Results are expected in 2020. Stay tuned!

More information on the CristalACTiV™ product range for photocatalysis can be found at

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Cristal, now as part of Tronox, is continuously developing new CristalACTiV™ materials to meet existing and future environmental regulations and respond to the needs of innovative applications.

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