The Pulse ChemiSorb 2705 makes catalyst evaluation convenient by utilizing the well-established titration technique in which small, reproducible volumes of a reactive gas are injected into a flowing carrier gas that passes over the catalyst.
Gas composition is detected by matched thermal conductivity cells.
From repeated injections of identical reactive gas quantities, all, most, some, and then none of each pulse is chemisorbed. The cumulative chemisorbed quantity is derived by summing the proportions of all pulses consumed. Dispersion, acidity, metal surface area, and other important parameters are derived from the chemisorbed quantity, taking into account stoichiometry factors and the nature of both the gas and metal involved. Physisorption is accomplished using the dynamic gas flow technique. Total surface area and pore characterizing information is computed from the gas quantity extracted according to well-accepted relationships.