{"id":{"repo_id":"brazil-uerj","oai_identifier":"oai:pantheon.ufrj.br:11422/7913"},"canonical_url":"https://search.dev.ndltd.org/etd/brazil-uerj/oai:pantheon.ufrj.br:11422/7913","repository":{"repo_id":"brazil-uerj","name":"Brazil UERJ","base_url":"https://pantheon.ufrj.br/oai/request"},"display":{"title":"Hidrogenação de ácido levulínico a gama-valerolactona empregando fosfetos de metais de transição suportados em sílica","abstract":"The following silica supported phosphides with loading of 30 wt% were prepared, characterized and evaluated for levulinic acid hydrogenation to γ- valerolactone: Ni2P, CoP, MoP, WP and Fe2P. The catalysts were prepared in two steps: phosphate synthesis by incipient wetness followed by calcination, and phosphide synthesis by in situ temperature programmed reduction. The samples were characterized by N2 physisorption at -196 ˚C, X-Ray diffraction, inductively coupled plasma optical emission spectrometry, CO chemisorption and temperature programed CO desorption. Temperature programed surface reaction experiments were also performed with 30 wt% Ni2P/SiO2. The catalytic evaluation were performed in a three phase trickle bed reactor, using H2 as hydrogen source and water as solvent, at 30 bar, 125 ˚C and weight hourly space velocity of 15 h -1 . In such conditions, theoretical calculations showed the absence of mass-transfer limitations. Among the evaluated phosphides, the best performance was obtained by 30 wt% Ni2P/SiO2 (conversion of 60%), based on the same weight of catalyst precursor loaded in the reactor, exhibiting a turnover frequency higher than the most effective catalyst for this reaction, 5% (m/m) Ru/C, to date. However, the supported phosphides suffered deactivation due to leaching of the active phase caused by water and increased by the presence of levulinic acid.","abstract_html":"The following silica supported phosphides with loading of 30 wt% were prepared, characterized and evaluated for levulinic acid hydrogenation to γ- valerolactone: Ni2P, CoP, MoP, WP and Fe2P. The catalysts were prepared in two steps: phosphate synthesis by incipient wetness followed by calcination, and phosphide synthesis by in situ temperature programmed reduction. The samples were characterized by N2 physisorption at -196 ˚C, X-Ray diffraction, inductively coupled plasma optical emission spectrometry, CO chemisorption and temperature programed CO desorption. Temperature programed surface reaction experiments were also performed with 30 wt% Ni2P/SiO2. The catalytic evaluation were performed in a three phase trickle bed reactor, using H2 as hydrogen source and water as solvent, at 30 bar, 125 ˚C and weight hourly space velocity of 15 h -1 . In such conditions, theoretical calculations showed the absence of mass-transfer limitations. Among the evaluated phosphides, the best performance was obtained by 30 wt% Ni2P/SiO2 (conversion of 60%), based on the same weight of catalyst precursor loaded in the reactor, exhibiting a turnover frequency higher than the most effective catalyst for this reaction, 5% (m/m) Ru/C, to date. However, the supported phosphides suffered deactivation due to leaching of the active phase caused by water and increased by the presence of levulinic acid.","abstract_has_math":false,"creators":["Albuquerque, Flávia Pereira de"],"institution":"Universidade Federal do Rio de Janeiro","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["Silva, Victor Luis dos Santos Teixeira da"],"committee_chairs":[],"committee_members":[],"year":2016,"date_issued":"2016-07","date_published":"2016-07","updated_at":"2026-07-24T01:16:26Z","subjects":["Engenharia química","Fosfetos de metais de transição","Hidrogenação","Gama-valerolactona","Ácido levulínico"],"languages":["por"],"rights":["Acesso Aberto"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/11422/7913","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Silva, Victor Luis dos Santos Teixeira da"]},{"key":"dc:creator","label":"Author","values":["Albuquerque, Flávia Pereira de"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2019-05-13T18:10:26Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2026-05-16T03:02:53Z"]},{"key":"dc:date.issued","label":"Date","values":["2016-07"]},{"key":"dc:publisher","label":"Institution","values":["Universidade Federal do Rio de Janeiro"]},{"key":"dc:publisher.department","label":"Dc Publisher Department","values":["Instituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa de Engenharia"]},{"key":"dc:type","label":"Dc Type","values":["Dissertação"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Engenharia química","Fosfetos de metais de transição","Hidrogenação","Gama-valerolactona","Ácido levulínico"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["por"]},{"key":"dc:rights","label":"Dc Rights","values":["Acesso Aberto"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/11422/7913"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["The following silica supported phosphides with loading of 30 wt% were prepared, characterized and evaluated for levulinic acid hydrogenation to γ- valerolactone: Ni2P, CoP, MoP, WP and Fe2P. The catalysts were prepared in two steps: phosphate synthesis by incipient wetness followed by calcination, and phosphide synthesis by in situ temperature programmed reduction. The samples were characterized by N2 physisorption at -196 ˚C, X-Ray diffraction, inductively coupled plasma optical emission spectrometry, CO chemisorption and temperature programed CO desorption. Temperature programed surface reaction experiments were also performed with 30 wt% Ni2P/SiO2. The catalytic evaluation were performed in a three phase trickle bed reactor, using H2 as hydrogen source and water as solvent, at 30 bar, 125 ˚C and weight hourly space velocity of 15 h -1 . In such conditions, theoretical calculations showed the absence of mass-transfer limitations. Among the evaluated phosphides, the best performance was obtained by 30 wt% Ni2P/SiO2 (conversion of 60%), based on the same weight of catalyst precursor loaded in the reactor, exhibiting a turnover frequency higher than the most effective catalyst for this reaction, 5% (m/m) Ru/C, to date. However, the supported phosphides suffered deactivation due to leaching of the active phase caused by water and increased by the presence of levulinic acid."]},{"key":"dc:title","label":"Title","values":["Hidrogenação de ácido levulínico a gama-valerolactona empregando fosfetos de metais de transição suportados em sílica"]}]}],"canonical_facts":{"dc:contributor.advisor":["Silva, Victor Luis dos Santos Teixeira da"],"dc:creator":["Albuquerque, Flávia Pereira de"],"dc:date.accessioned":["2019-05-13T18:10:26Z"],"dc:date.available":["2026-05-16T03:02:53Z"],"dc:date.issued":["2016-07"],"dc:description.abstract":["The following silica supported phosphides with loading of 30 wt% were prepared, characterized and evaluated for levulinic acid hydrogenation to γ- valerolactone: Ni2P, CoP, MoP, WP and Fe2P. The catalysts were prepared in two steps: phosphate synthesis by incipient wetness followed by calcination, and phosphide synthesis by in situ temperature programmed reduction. The samples were characterized by N2 physisorption at -196 ˚C, X-Ray diffraction, inductively coupled plasma optical emission spectrometry, CO chemisorption and temperature programed CO desorption. Temperature programed surface reaction experiments were also performed with 30 wt% Ni2P/SiO2. The catalytic evaluation were performed in a three phase trickle bed reactor, using H2 as hydrogen source and water as solvent, at 30 bar, 125 ˚C and weight hourly space velocity of 15 h -1 . In such conditions, theoretical calculations showed the absence of mass-transfer limitations. Among the evaluated phosphides, the best performance was obtained by 30 wt% Ni2P/SiO2 (conversion of 60%), based on the same weight of catalyst precursor loaded in the reactor, exhibiting a turnover frequency higher than the most effective catalyst for this reaction, 5% (m/m) Ru/C, to date. However, the supported phosphides suffered deactivation due to leaching of the active phase caused by water and increased by the presence of levulinic acid."],"dc:identifier.uri":["http://hdl.handle.net/11422/7913"],"dc:language":["por"],"dc:publisher":["Universidade Federal do Rio de Janeiro"],"dc:publisher.department":["Instituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa de Engenharia"],"dc:rights":["Acesso Aberto"],"dc:subject":["Engenharia química","Fosfetos de metais de transição","Hidrogenação","Gama-valerolactona","Ácido levulínico"],"dc:title":["Hidrogenação de ácido levulínico a gama-valerolactona empregando fosfetos de metais de transição suportados em sílica"],"dc:type":["Dissertação"]},"updated_at":"2026-07-24T01:16:26Z"}