Correction: From the Birkeland-Eyde process towards energy-efficient plasma-based NO X synthesis: a techno-economic analysis

There was an error in the conversion factor between ammonia (NH3) and nitric acid (HNO3), causing the cost of direct plasma�based NOX synthesis to be overestimated by a factor of 13.7. The cost per ton of nitric acid was multiplied by 63.01 g per mol-HNO3 and divided by 17.031 g per mol-NH3, whereas the cost per ton of nitric acid should have been divided by 63.01 g per mol-HNO3 and divided by 17.031 g per mol-NH3. The subsections ‘Effect of energy consumption’, ‘Effect of electricity cost & process capacity’, and ‘Effect of process capacity’ in the section ‘Comparison of direct plasma-based NOX synthesis and the Haber–Bosch process combined with the Ostwald process’ have been rewritten, and Fig. 8–10 have been amended to accommodate the corrections. The overall conclusions of the work have been rewritten as well, as the corrected analysis shows that plasma-based NOX synthesis is more much competitive with the Haber–Bosch process combined with the Ostwald process than in our original analysis. References cited herein are as provided in the original article except where new references are indicated. We are grateful for remarks from Dr B. Heinz (Yara) and Dr Broekhuis (Sabic), making us aware of the mistake.