<p>Plasma catalysis is gaining increasing interest for various gas conversion applications, such as CO(2)conversion into value-added chemicals and fuels, CH(4)activation into hydrogen, higher hydrocarbons or oxygenates, and NH(3)synthesis. &nbsp; Other applications are already more established, suchas for air pollution control, e.g. volatile organic compound remediation, particulate matter and NO(x)removal. &nbsp; In addition, plasma is also very promising for catalyst synthesis and treatment. &nbsp; Plasma catalysis clearly has benefits over 'conventional' catalysis, as outlined in the Introduction. &nbsp; However, a better insight into the underlying physical and chemical processes is crucial. &nbsp; The key challenge is to design cost-effective, highly active and stable catalysts tailored to the plasma environment. &nbsp; Therefore, insight from thermal catalysis as well as electro- and photocatalysis is crucial.</p>