The adsorption of D2 and CO2 on catalyst surfaces is studied using a molecular beam in ultra-high vacuum. The data consists of mass spectrometer/vacuum pressure data, reflection absorption infrared spectrometry data, and time of flight measurement data. The raw data, lab journals, and Python scripts to analyze the data are included. The raw data is placed in folders sorted by date. Most metadata is included in the Python scripts, where the data is read and processed. It can also be found in the lab journal.