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 their effects the capacity for nitrogen adsorption were investigated in microbalance system. operating conditions coking as follows:  100−420 °C, pressure alkene 0.97 bar, 0.085 g zeolite, time 5 min to 100 h. At low temperatures (100−150 °C), coke constituted mainly oligomers formed acid sites zeolite. These located α cages can be removed by thermal treatment vacuum at high temperatures. effect was more pronounced due preferential location near outer surface crystallites. (350−420 aromatics polyaromatics which cannot simple treatment. showed that whatever origin, these molecules (most likely poly...