**4. Conclusions**

In this review, the application of bimetallic catalysts for VOC oxidation was examined in terms of catalytic activity and physicochemical properties. Among the various systems, gold-based bimetallic catalysts exhibited a good performance in the degradation of a wide range of VOCs. The presence of nanosized gold was essential to decreasing the light-off temperature of VOC oxidation, whereas interaction with the second metal allowed increasing the reactivity of the employed support or enhancing oxygen activation. Although platinum-based bimetallic samples usually did not overcome the degradation yields achieved with the monometallic platinum catalysts, they showed a substantial improvement of catalytic stability due to the synergistic effect between platinum and the second noble or transition metal. Finally, the application of the already stated synergisms in catalytic thermo-oxidation, for example, strong Au-Pd interaction, can be successfully transferred to new technologies for VOC abatement, such as photocatalytic oxidation, with the exploitation of new mutual effects such as surface plasmon resonance combined with the high reactivity of noble/transition metals. This can be a promising strategy to achieve significant progress in the technologies applied to the improvement of air quality.

**Funding:** R.F. thanks the PON project "AIM" founded by the European Social Found (ESF) CUP: E66C18001220005 for the financial support.

**Acknowledgments:** This review was written during the Italian quarantine due to COVID-19. I want to dedicate this work to all the people who could not stay at home because they fought against the virus. R.F. thanks S. Scirè and C. Crisafulli who have positively transferred the knowledge and the passion for the research in the field of heterogeneous catalysis focused on environmental applications.

**Conflicts of Interest:** The author declares no conflict of interest.
