**Acknowledgements**

With financial support from the state government of North Rhine-Westphalia and the Indo-German Science & Technology Centre (IGSTC). TEM acknowledges the support of Fraunhofer-Institut für Umwelt-, Sicherheits- und Energietechnik UMSICHT. P. Tomkins and E. Gebauer-Henke are gratefully acknowledged for the characterisation of the Ru/CNT catalyst, C. Herwartz (GFE) for TEM measurements, M. Hermesmann for the literature searches on environmental impact, as well as D. Panke for drawing the chemical structure of biomass fractions.
