Mostrar el registro sencillo del ítem

dc.contributor.authorPalomo-Jiménez, José
dc.contributor.authorRosas-Martínez, Juana María 
dc.contributor.authorRodríguez-Mirasol, José 
dc.contributor.authorCordero-Alcántara, Tomás 
dc.date.accessioned2016-10-10T12:56:57Z
dc.date.available2016-10-10T12:56:57Z
dc.date.created2016
dc.date.issued2016
dc.identifier.citation6th EuCheMS Chemistry Congresses_ES
dc.identifier.urihttp://hdl.handle.net/10630/12201
dc.descriptionResumen comunicación congreso internacionales_ES
dc.description.abstractDME is playing an important role due to its potential use as an alternative fuel in diesel engines. The use of this fuel produces lower NOx emissions, and less engine noise compared to traditional diesel fuels. Moreover, this compound is used as building block for many value-added chemicals such as lower olefins. DME is usually produced via catalytic dehydration of methanol over a solid acid. The use of activated carbons in catalytic processes, acting directly as catalyst and as catalyst support, is focussing much attention. They can be obtained from different types of lignocellulosic waste, producing not only an environmental but an economical profit. In this sense, the preparation of activated carbons with phosphoric acid produces catalytic supports with certain surface acidity, which have shown high activity for alcohol dehydration. In this study, ZrO2 supported activated carbons were prepared from an industrial byproduct as lignin for the methanol dehydration to DME. The activated carbon was prepared by chemical activation with H3PO4, using Alcell® lignin as precursor. The impregnation ratio value (H3PO4/lignin) used was 3. The impregnated sample was activated under N2 flow at 500 ºC for 2h, washed and dried. The activated carbon was loaded with different amounts of ZrO(NO3)2, dried at 120ºC for 24h, and calcined in air at 250ºC for 2h, obtaining ZrO2 loadings of 5 and 10%, respectively. For the sake of comparison, pure ZrO2 was also used. Catalytic tests were performed at atmospheric pressure in a fixed bed reactor, at different space times and partial pressures. The activated carbon (ACP) prepared shows a well-developed porous structure, with an apparent surface area higher than 2000 m2/g, and a high contribution of mesoporosity. After metal loading, a maximum decrease of 20% in all structural parameters of the ACP was observed.The results show that ZrO2 loading produces an enhancing in the catalytic activity of the carbon materials compared to the parent activated carbon (0.1 g·s/μmol, PCH3OH= 0.02 atm in helium and 350 ºC). In this sense, a methanol conversion of 25% was observed with the addition of 10% w/w ZrO2 (ACP-10Zr), at steady state conditions (Figure 1). ACP shows negligible conversion, at the same conditions and for pure ZrO2 the methanol conversion was of 10%. Very high selectivity to DME (~100%) was found at temperatures lower than 350 ºC. The methanol conversion increases with temperature, reaching a value of 67% at 475ºC, but a slight decrease in DME selectivity is observed, resulting in a higher production of light hydrocarbons, mainly CH4. The results suggest that the addition of only a 10% of ZrO2 over an activated carbon prepared by chemical activation with H3PO4 enhances significantly the performance of the catalyst, compared to pure ZrO2.es_ES
dc.description.sponsorshipUniversidad de Málaga. Campus de Excelencia Internacional Andalucía Tech.es_ES
dc.language.isoenges_ES
dc.publisherAsociación Nacional de Químicos de Españaes_ES
dc.rightsinfo:eu-repo/semantics/openAccesses_ES
dc.subjectCarbón activadoes_ES
dc.subjectMetanoles_ES
dc.subjectFósforoes_ES
dc.subject.otherMethanol dehydrationes_ES
dc.subject.otherDMEes_ES
dc.subject.otherActivated carbones_ES
dc.subject.otherZirconiaes_ES
dc.subject.otherPhosphoruses_ES
dc.titleMethanol dehydration over ZrO2 supported-activated carbonses_ES
dc.typeinfo:eu-repo/semantics/conferenceObjectes_ES
dc.centroE.T.S.I. Industriales_ES
dc.relation.eventtitle6th EuCheMS Chemistry Congresses_ES
dc.relation.eventplaceSevilla (España)es_ES
dc.relation.eventdateSeptiembre 2016es_ES
dc.cclicenseby-nc-ndes_ES


Ficheros en el ítem

Este ítem aparece en la(s) siguiente(s) colección(ones)

Mostrar el registro sencillo del ítem