Abstract
We have used microcalorimetry to measure the differential heats of adsorption for a series of simple amines in H-ZSM-5 as a function of coverage. For each molecule studied, the heats of adsorption were approximately constant to a coverage of close to 1 per Al. The average heats of adsorption in the low coverage regime were as follows: ammonia (145 kJ/mol), methylamine (185 kJ/mol), ethylamine (195 kJ/mol), isopropylamine (205 kJ/mol), n-butylamine (220 kJ/mol), dimethylamine (205 kJ/mol), and trimethylamine (205 kJ/mol). An excellent correlation is found between these heats and gas-phase, proton affinities. The heats of adsorption increase in increments that are identical to the gas-phase, proton-affinity differences, except for relatively small deviations with trimethylamine and n-butylamine
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