Synthesis gas fermentation at high cell density: How pH and hydrogen partial pressure affect productivity and product ratio in continuous fermentation.

For the first time, syngas fermentation was operated continuously with total cell retention and process pressures up to 4barg in long-term runs of up to 3000 hours. Throughout this time, the process was stable. The measured data have shown that hydrogen uptake and ethanol space-time yield are highest at a slightly reduced pH of 5.

Formic Acid Formation by at Elevated Pressures of Carbon Dioxide and Hydrogen.

Low productivities of bioprocesses using gaseous carbon and energy sources are usually caused by the low solubility of those gases (e.g., H and CO).

Exploring hydrothermally grown potassium titanate fibers by STEM-in-SEM/EDX and XRD.

During lab-scale experiments on the reforming of methanol by means of water at supercritical conditions (T > 374 degrees C, p > 22.1 MPa), a tubular reactor with a titanium liner was exposed to an aqueous solvent containing methanol (5 wt%) and KHCO3 (0.3 wt%).