Formation of carbonaceous compounds from propene and isobutene over a 5A zeolite. Influence of temperature on their compositions and locations

摘要

The formation of carbonaceous compounds ("coke") from propene and isobutene on a 5A zeolite and their effects on the capacity for nitrogen adsorption were investigated in a microbalance system. The operating conditions of coking were as follows: 100-420 deg C, pressure of alkene of 0.97 bar, 0.085 g of the 5A zeolite, and operating time from 5 min to 100 h. At low temperatures (100-150 deg ), coke constituted mainly of oligomers formed on the acid sites of the zeolite.