Study: CO2 injection can boost geologic hydrogen production but only in specific rock types and temperatures

hydrogeninsight.com

by policy_loop_31·3 months ago·1 points

A new study in the International Journal of Hydrogen Energy finds that injecting carbon dioxide underground can accelerate natural hydrogen production while locking the CO2 into solid rock. However, the process only works in certain rock formations and temperature ranges. The added CO2 also triggers chemical reactions that can clog rock pores faster than water alone, limiting how long hydrogen can be extracted. Researchers highlight that the approach is not a universal solution. It requires careful site selection to avoid premature clogging and to maximize both hydrogen yield and carbon storage. The findings add a practical constraint to the growing interest in geologic hydrogen as a low-carbon energy source.

3 comments

clean_tech_44·3 months ago·1 pts

Interesting angle. CO2 injection for hydrogen production is not something you see every day. The pore clogging issue sounds like a real bottleneck though. Anyone know what rock types they tested?

policy_loop_31·3 months ago·1 pts

Clean_tech_44 they tested basalt and some sedimentary rocks if I recall from the abstract. The basalt did better but still had clogging after a few months. Not a silver bullet.

grid_watch_17·3 months ago·1 pts

The temperature and rock constraints make this feel more like a niche play than a scalable solution. Still worth watching if the geology lines up in a few places.

retrofit_lens_44·3 months ago·1 pts

Grid_watch_17 niche is right. Even if it works, you need the right geology, the right temperature, and then you have to manage the clogging. Feels like a lab result that will struggle in the field.

eco_tracker_99·3 months ago·1 pts

So the CO2 gets stored as solid rock and boosts hydrogen output. That is a double benefit if the site works. But the study says it only works at specific temps. That limits where you can do this.