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Methanol conversion on acidic ZSM-5, offretite, and mordenite zeolites: A comparative study of the formation and stability of coke deposits by P DEJAIFVE is a Materials Science article available to read on EtoBox.

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The deposition of carbonaceous residues, leading to aging and modifications in the acidic properties of three zeolite samples differing by the size and shape of their interconnecting channel networks (ZSM-5, olfretite, and mordenite), has been investigated during the conversion reaction of methanol to hydrocarbons. Catalytic tests, thermogravimetry, and microcalorimetry are used as complementary techniques. For zeolite ZSMJ, it is observed that carbonaceous residues are primarily formed on the outer surface of the crystallites, resulting only in a slight modification of its molecular shape-selective properties and producing a high resistance to aging. For offretite and mordenite, by contrast, the channels are large enough to accommodate carbonaceous residues, which leads to a drastic loss of catalytic activity and a very fast aging. The intimate nature of the channel network is shown to play a determining role in the coke formation and in the ease of removal of carbonaceous deposit. The role played by the shape-selective properties of the zeolites on their behavior towards coking and aging and also the effect of coking on the availability of Brgnsted acidic sites have been particul

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Author

P DEJAIFVE

Publisher

Elsevier BV

Published

1981

Language

EN

Field

Materials Science (Physical Sciences)