Aromaticity of five- and six-membered heterocycles present in crude oils – An electronic description for hydrotreatment process
[Display omitted] ► DFT study of five- and six-membered compounds present in hydrotreatment process was performed. ► Proton affinities of aromatic compounds were calculated. ► Geometrical modifications were observed for five-membered heterocyclic compounds. ► Hückel’s rule was satisfied in pyridine...
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Veröffentlicht in: | Fuel (Guildford) 2012-10, Vol.100, p.177-185 |
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creator | Valencia, Diego Klimova, Tatiana García-Cruz, Isidoro |
description | [Display omitted]
► DFT study of five- and six-membered compounds present in hydrotreatment process was performed. ► Proton affinities of aromatic compounds were calculated. ► Geometrical modifications were observed for five-membered heterocyclic compounds. ► Hückel’s rule was satisfied in pyridine protonated compounds, not for five-membered ones. ► Aromatic stabilization energy explains the refractory character and catalyst poisoning by pyridine derivatives.
The present work is focused on attempt to understand the importance of aromaticity in the elimination of N, O and S atoms from five-membered heterocycles and catalyst poisoning by basic nitrogen six-membered heterocyclic compounds in the hydrotreatment (HDT) process. Pyrrole, furan, thiophene and pyridine, and their fused benzene ring derivatives have been studied by means of density functional theory (DFT). Proton affinities (PAs) were calculated for all these compounds, geometrical modifications were observed during protonation. Five-membered aromatic compounds break planarity due to proton interaction of the heteroatom, while pyridine-type compounds do not. Aromatic stabilization energy (ASE) was calculated by homodesmotic chemical reactions for all heterocyclic compounds. The energetic trends for protonated and unprotonated compounds confirm the less reactivity of dibenzo-compounds in the HDT process and catalyst’s poisoning by pyridine derivatives present in crude oils. |
doi_str_mv | 10.1016/j.fuel.2012.05.011 |
format | Article |
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► DFT study of five- and six-membered compounds present in hydrotreatment process was performed. ► Proton affinities of aromatic compounds were calculated. ► Geometrical modifications were observed for five-membered heterocyclic compounds. ► Hückel’s rule was satisfied in pyridine protonated compounds, not for five-membered ones. ► Aromatic stabilization energy explains the refractory character and catalyst poisoning by pyridine derivatives.
The present work is focused on attempt to understand the importance of aromaticity in the elimination of N, O and S atoms from five-membered heterocycles and catalyst poisoning by basic nitrogen six-membered heterocyclic compounds in the hydrotreatment (HDT) process. Pyrrole, furan, thiophene and pyridine, and their fused benzene ring derivatives have been studied by means of density functional theory (DFT). Proton affinities (PAs) were calculated for all these compounds, geometrical modifications were observed during protonation. Five-membered aromatic compounds break planarity due to proton interaction of the heteroatom, while pyridine-type compounds do not. Aromatic stabilization energy (ASE) was calculated by homodesmotic chemical reactions for all heterocyclic compounds. The energetic trends for protonated and unprotonated compounds confirm the less reactivity of dibenzo-compounds in the HDT process and catalyst’s poisoning by pyridine derivatives present in crude oils.</description><identifier>ISSN: 0016-2361</identifier><identifier>EISSN: 1873-7153</identifier><identifier>DOI: 10.1016/j.fuel.2012.05.011</identifier><language>eng</language><publisher>Kidlington: Elsevier Ltd</publisher><subject>Applied sciences ; Aromaticity ; Crude oil, natural gas and petroleum products ; DFT ; Energy ; Energy. Thermal use of fuels ; Exact sciences and technology ; Fuels ; Heterocycles ; Hydrotreatment ; Processing of crude oil and oils from shales and tar sands. Processes. Equipment. Refinery and treatment units ; Proton affinity</subject><ispartof>Fuel (Guildford), 2012-10, Vol.100, p.177-185</ispartof><rights>2012</rights><rights>2015 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c363t-3b166e0fc9aa1effdd5533ff5ea1fbd0f40198b51ed8352b909b67ada54f51223</citedby><cites>FETCH-LOGICAL-c363t-3b166e0fc9aa1effdd5533ff5ea1fbd0f40198b51ed8352b909b67ada54f51223</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.fuel.2012.05.011$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>309,310,314,780,784,789,790,3550,23930,23931,25140,27924,27925,45995</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=26341378$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Valencia, Diego</creatorcontrib><creatorcontrib>Klimova, Tatiana</creatorcontrib><creatorcontrib>García-Cruz, Isidoro</creatorcontrib><title>Aromaticity of five- and six-membered heterocycles present in crude oils – An electronic description for hydrotreatment process</title><title>Fuel (Guildford)</title><description>[Display omitted]
► DFT study of five- and six-membered compounds present in hydrotreatment process was performed. ► Proton affinities of aromatic compounds were calculated. ► Geometrical modifications were observed for five-membered heterocyclic compounds. ► Hückel’s rule was satisfied in pyridine protonated compounds, not for five-membered ones. ► Aromatic stabilization energy explains the refractory character and catalyst poisoning by pyridine derivatives.
The present work is focused on attempt to understand the importance of aromaticity in the elimination of N, O and S atoms from five-membered heterocycles and catalyst poisoning by basic nitrogen six-membered heterocyclic compounds in the hydrotreatment (HDT) process. Pyrrole, furan, thiophene and pyridine, and their fused benzene ring derivatives have been studied by means of density functional theory (DFT). Proton affinities (PAs) were calculated for all these compounds, geometrical modifications were observed during protonation. Five-membered aromatic compounds break planarity due to proton interaction of the heteroatom, while pyridine-type compounds do not. Aromatic stabilization energy (ASE) was calculated by homodesmotic chemical reactions for all heterocyclic compounds. The energetic trends for protonated and unprotonated compounds confirm the less reactivity of dibenzo-compounds in the HDT process and catalyst’s poisoning by pyridine derivatives present in crude oils.</description><subject>Applied sciences</subject><subject>Aromaticity</subject><subject>Crude oil, natural gas and petroleum products</subject><subject>DFT</subject><subject>Energy</subject><subject>Energy. Thermal use of fuels</subject><subject>Exact sciences and technology</subject><subject>Fuels</subject><subject>Heterocycles</subject><subject>Hydrotreatment</subject><subject>Processing of crude oil and oils from shales and tar sands. Processes. Equipment. Refinery and treatment units</subject><subject>Proton affinity</subject><issn>0016-2361</issn><issn>1873-7153</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2012</creationdate><recordtype>article</recordtype><recordid>eNp9kM2KFDEUhYMo2I6-gKtsBDdVk1Q69QNumsFRYcCNrkMquWHSVCXtvenB3ukz-IY-iWl6cDmru_nOOdyPsbdStFLI_nrfhiMsbSdk1wrdCimfsY0cB9UMUqvnbCMq1XSqly_ZK6K9EGIY9XbDfu8wr7ZEF8uJ58BDfICG2-Q5xZ_NCusMCJ7fQwHM7uQWIH5AIEiFx8QdHj3wHBfif3_94bvEYQFXMKfouAdyGA8l5sRDRn5_8pgLgi3rOX6ohUD0mr0IdiF483iv2Pfbj99uPjd3Xz99udndNU71qjRqln0PIrjJWgkheK-1UiFosDLMXoStkNM4awl-VLqbJzHN_WC91dugZdepK_b-0lt3fxyBilkjOVgWmyAfyUihxl4MahIV7S6ow0yEEMwB42rxVCFz9m325uzbnH0boU31XUPvHvstObsEtMlF-p_serWVahgr9-HCQX32IQIachGSAx-xqjM-x6dm_gF5GJo2</recordid><startdate>20121001</startdate><enddate>20121001</enddate><creator>Valencia, Diego</creator><creator>Klimova, Tatiana</creator><creator>García-Cruz, Isidoro</creator><general>Elsevier Ltd</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7ST</scope><scope>C1K</scope><scope>SOI</scope></search><sort><creationdate>20121001</creationdate><title>Aromaticity of five- and six-membered heterocycles present in crude oils – An electronic description for hydrotreatment process</title><author>Valencia, Diego ; Klimova, Tatiana ; García-Cruz, Isidoro</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c363t-3b166e0fc9aa1effdd5533ff5ea1fbd0f40198b51ed8352b909b67ada54f51223</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2012</creationdate><topic>Applied sciences</topic><topic>Aromaticity</topic><topic>Crude oil, natural gas and petroleum products</topic><topic>DFT</topic><topic>Energy</topic><topic>Energy. Thermal use of fuels</topic><topic>Exact sciences and technology</topic><topic>Fuels</topic><topic>Heterocycles</topic><topic>Hydrotreatment</topic><topic>Processing of crude oil and oils from shales and tar sands. Processes. Equipment. Refinery and treatment units</topic><topic>Proton affinity</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Valencia, Diego</creatorcontrib><creatorcontrib>Klimova, Tatiana</creatorcontrib><creatorcontrib>García-Cruz, Isidoro</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Environment Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Environment Abstracts</collection><jtitle>Fuel (Guildford)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Valencia, Diego</au><au>Klimova, Tatiana</au><au>García-Cruz, Isidoro</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Aromaticity of five- and six-membered heterocycles present in crude oils – An electronic description for hydrotreatment process</atitle><jtitle>Fuel (Guildford)</jtitle><date>2012-10-01</date><risdate>2012</risdate><volume>100</volume><spage>177</spage><epage>185</epage><pages>177-185</pages><issn>0016-2361</issn><eissn>1873-7153</eissn><abstract>[Display omitted]
► DFT study of five- and six-membered compounds present in hydrotreatment process was performed. ► Proton affinities of aromatic compounds were calculated. ► Geometrical modifications were observed for five-membered heterocyclic compounds. ► Hückel’s rule was satisfied in pyridine protonated compounds, not for five-membered ones. ► Aromatic stabilization energy explains the refractory character and catalyst poisoning by pyridine derivatives.
The present work is focused on attempt to understand the importance of aromaticity in the elimination of N, O and S atoms from five-membered heterocycles and catalyst poisoning by basic nitrogen six-membered heterocyclic compounds in the hydrotreatment (HDT) process. Pyrrole, furan, thiophene and pyridine, and their fused benzene ring derivatives have been studied by means of density functional theory (DFT). Proton affinities (PAs) were calculated for all these compounds, geometrical modifications were observed during protonation. Five-membered aromatic compounds break planarity due to proton interaction of the heteroatom, while pyridine-type compounds do not. Aromatic stabilization energy (ASE) was calculated by homodesmotic chemical reactions for all heterocyclic compounds. The energetic trends for protonated and unprotonated compounds confirm the less reactivity of dibenzo-compounds in the HDT process and catalyst’s poisoning by pyridine derivatives present in crude oils.</abstract><cop>Kidlington</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.fuel.2012.05.011</doi><tpages>9</tpages></addata></record> |
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subjects | Applied sciences Aromaticity Crude oil, natural gas and petroleum products DFT Energy Energy. Thermal use of fuels Exact sciences and technology Fuels Heterocycles Hydrotreatment Processing of crude oil and oils from shales and tar sands. Processes. Equipment. Refinery and treatment units Proton affinity |
title | Aromaticity of five- and six-membered heterocycles present in crude oils – An electronic description for hydrotreatment process |
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