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• W2409651490 endingPage "263" @default.
• W2409651490 startingPage "189" @default.
• W2409651490 abstract "The conversion of methanol to hydrocarbons over molecular sieve catalysts has been subject of a widespread research activity since the early 1970s. The formation of the first CC bond is the limiting step in methanol to olefins (MTO) kinetics and should be mechanistically separated from the further pathways, which contribute to the formation of olefins. The hydrocarbons are formed from methanol (MeOH)/dimethyl ether (DME) via a dual-cycle mechanism, where ethylene and propylene are the secondary products. The mechanism has contributed significantly to the general understanding of the MTO reaction over different zeolite topologies. Originally, the concept includes an aromatics/ethylene cycle and an olefins cycle. Based on recent results in literature, which point out that olefins themselves are the dominating species involved in the hydrocarbon pool, a refined version has been proposed. It consists of a coke-catalyzing coupling cycle and a cracking cycle. Homologation plays an important role in both reaction pathways. The coke-catalyzing or “aromatic/coke” cycle leads mainly to ethylene and to propylene to a lesser extent. Polymethylbenzenes can be the active sites, but any coke species can also play a role. The light olefins are formed via side chain growth on the coke species followed by the elimination of side alkyl chains or alkylation/dealkylation of the short olefinic fragments with the coke species. The cracking cycle or “olefins” cycle involves chain growth via oligomerization or homologation reactions followed by cracking to ethylene and propylene. Ethylene is not directly produced from methanol. The ethylene is mostly a product of aromatic/coke cycle, which comes from an alkylation/dealkylation of the coke species. However, some ethylene may also be produced from the cracking cycle at higher temperature. On the contrary, propylene is at least one of the primary products in the MTO reaction. However, the majority of propylene is produced as a secondary product at a high level of conversion. The zeolite topology influences the type of mechanism that occurs during the MTO reaction. SAPO-34 favors the “aromatic/coke” cycle and limits the “olefins” cycle. Conversely, ZSM-5 demonstrates a dominance of the olefins cycle. In the case of ZSM-22, both aromatic/coke and olefins cycles are suppressed. Only the methylation reaction is happening, resulting in a formation of the fraction rich in C5+ aliphatics, instead of light olefins." @default.
• W2409651490 created "2016-06-24" @default.
• W2409651490 creator A5029860090 @default.
• W2409651490 creator A5043884590 @default.
• W2409651490 creator A5046321879 @default.
• W2409651490 creator A5066751015 @default.
• W2409651490 creator A5074654065 @default.
• W2409651490 date "2016-01-01" @default.
• W2409651490 modified "2023-10-14" @default.
• W2409651490 title "Methanol to Olefins" @default.
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