Abstract
A procedure was developed for evaluating the adsorption of hydrocarbons on solids by monitoring the temperature of the gas over the sample layer and inside it, the heat conductivity of the gas at the inlet and outlet of the flow reactor, and the composition of the gas after the sample. The adsorption-desorption of isobutane accompanied by heat liberation or absorption (recorded as a temperature change in the zeolite layer) was studied using the H-TsVM zeolite as an example. The temperature effects during isobutane adsorption and desorption were compared. It was concluded that below ∼90°C, some part of isobutane is significantly chemisorbed on H-TsVM. The highly adsorbed isobutane can be removed by keeping the sample in a nitrogen flow for a long time or by heating it above 90°C. Time dependence of isobutane desorption at constant temperature can be described by first order kinetic equation, making possible to estimate the activation energy of desorption of highly chemisorbed isobutane using the data on thermodesorption at linear temperature increase.
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