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Copper supported on inverse opal titania generated in-situ by sol-gel technology on optical fibers is effective in improving the photon utilization rate in a photocatalytic reactor.  Inverse opal titania allows the slow-down of photons and improves the quantum efficiency for the photoreduction of gaseous CO2 to CH3OH in the presence of water vapor and UV light. Methanol production rates (0.0364 ±0.0014 µ mol.g-cat-1.h-1) were comparable to those of a conventional fiber optic reactor using Cu supported on unstructured titania, but required much lower light intensities.   The production rate was independent of the feed rate indicating that the reaction is not mass-transfer controlled. The production rate increased with UV radiation intensity as I0.74 in contrast to I0.20 for unstructured titania. The inverse opal titania was predominantly anatase (101 crystalline phase), had a stop band gap of 307-397 nm and therefore capable of trapping UV light in the opal.  Copper supported on inverse opal titania showed features similar to those of pure titania and Copper was present mostly as Cu0.  XPS data showed that Cu was mostly dispersed on the surface.

Inverse Opal Titania on Optical Fiber for the Photoreduction of CO 2 to CH 3 OH