Alexander Krajete

Dr. Alexander Krajete is the founder and CEO of Krajete GmbH, an Austrian cleantech company that delivers scalable NOx reduction and valorisation systems. Using nature‑inspired adsorber purification and advanced biomethanation, he helps industries capture emissions well beyond compliance and convert them into profitable materials.

Education and Research

• PhD in Chemistry, Austria (2002).
• Post‑doctoral researcher at the University of California, Berkeley (2002‑2004).

Core expertise

• Regenerative NOx removal: zeolite adsorbers capture and enrich NOx for nitric-acid recovery, achieving sub-ppm levels even at low temperatures.
• Multi-gas fine-polishing: single skid handles NOx, SOx, H₂S, CO and slipping hydrocarbons (HC, VOC) to ppm levels, protecting pipelines and catalysts.
• Biological methanation: microbial, patented and commercialized high-pressure process that converts CO₂ + H₂ (hydrogen) to grid-grade CH₄ (methane)

Key Achievements:

• Holds two patent portfolios in high‑rate biomethanation and emissions gas treatment and utilisation.
• Regenerative emission gas process, consistently reducing NOx below 1 ppm, providing a low‑temperature alternative to SCR.
• Krajete biomethanation process, commercialised from scratch

Selected publications & projects

• “Experimental methods for screening parameters influencing the growth-to-product yield (Y_x/CH₄) of a biological methane production process performed with Methanothermobacter marburgensis,” AIMS Bioengineering 1 (2): 72-86 (2014).
• “Experimental workflow for developing a feed-forward strategy to control biomass growth and exploit maximum specific methane productivity of Methanothermobacter marburgensis,” AIMS Microbiology 2 (3): 262-277 (2016).
• “Biological methane production under putative Enceladus-like conditions,” Nature Communications (2018).
• “Kinetics, multivariate statistical modelling, and physiology of CO2-based biological methane production,” Applied Energy (2018).
• “Simulating putative Enceladus-like conditions: the possibility of biological methane production on Saturn’s icy moon,” Proceedings of the International Astronomical Union 14 (S345): 219-221 (2018).