Kinetics of CO Capture with Calcium Oxide during Direct Air Capture in a Fluidized Bed.

The bulk of research in carbon capture involves high CO concentrations. This work instead describes the kinetics of CaO carbonation in mixtures with CO between 0.38 and 2.

Uncovering the Dynamics of Urease and Carbonic Anhydrase Genes in Ureolysis, Carbon Dioxide Hydration, and Calcium Carbonate Precipitation.

The hydration of CO suffers from kinetic inefficiencies that make its natural trapping impractically sluggish. However, CO-fixing carbonic anhydrases (CAs) remarkably accelerate its equilibration by 6 orders of magnitude and are, therefore, "ideal" catalysts. Notably, CA has been detected in ureolytic bacteria, suggesting its potential involvement in microbially induced carbonate precipitation (MICP), yet the dynamics of the urease (Ur) and CA genes remain poorly understood.

Kinetic and Thermodynamic Enhancement of Low-Temperature Oxygen Release from Strontium Ferrite Perovskites Modified with Ag and CeO.

The redox behavior of the nonstoichiometric perovskite oxide SrFeO modified with Ag, CeO, and Ce was assessed for chemical looping air separation (CLAS) via thermogravimetric analysis and by cyclic release and uptake of O in a packed bed reactor. The results demonstrated that the addition of ∼15 wt % Ag at the surface of SrFeO lowers the temperature of oxygen release in N by ∼60 °C (i.e.

Production of Acetaldehyde via Oxidative Dehydrogenation of Ethanol in a Chemical Looping Setup.

A novel chemical looping (CL) process was demonstrated to produce acetaldehyde (AA) via oxidative dehydrogenation (ODH) of ethanol. Here, the ODH of ethanol takes place in the absence of a gaseous oxygen stream; instead, oxygen is supplied from a metal oxide, an active support for an ODH catalyst. The support material reduces as the reaction takes place and needs to be regenerated in air in a separate step, resulting in a CL process.