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Microwave synthesis of SAPO-11 materials for long chain n-alkanes hydroisomerization: effect of physical parameters and chemical gel composition

2017-07-25Journal article Restricted access
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dc.contributor.authorBertolo, R.
dc.contributor.authorSilva, J.M.
dc.contributor.authorRibeiro, M.F.
dc.contributor.authorMartins, A.
dc.contributor.authorFernandes, A.
dc.date.accessioned2017-09-25T14:12:32Z
dc.date.available2017-09-25T14:12:32Z
dc.date.issued2017-07-25
dc.description.abstractThe present work concerns the preparation of SAPO-11 materials using microwave (MW) heating during the crystallization process. Different experimental conditions such as crystallization temperature and time were explored, together with different Si sources. The final materials were fully characterized using chemical analysis, XRD diffraction, pyridine adsorption followed by FTIR, nitrogen sorption and NMR spectroscopy and compared with the respective conventional SAPO-11 materials, synthesized using the same initial chemical composition of the gel but under conventional electric heating. The results showed that SAPO-11 materials can be synthesized in less time (within minutes) and at lower temperature (170 °C) with MW heating than with conventional heating (respectively 24 h and 200 °C). MW heating allows nanosized SAPO-11 materials to be obtained but the nature of the Si source used has a marked influence on the textural properties and, especially, on the acidity of SAPO-11. The catalytic properties of the materials (with 0.5 wt.% Pt) were evaluated in the hydroisomerization of long chain n-alkanes using n-decane as model molecule. Optimized MW samples using colloidal AS-40 Si source showed higher yields in monobranched isomers due to a joint effect of low acidity and suitable textural properties.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationBERTOLO, R. [et al] - Microwave synthesis of SAPO-11 materials for long chain n-alkanes hydroisomerization: effect of physical parameters and chemical gel composition. Applied Catalysis A-General. ISSN 0926-860X. Vol. 542, (2017), pp.28-37pt_PT
dc.identifier.doi10.1016/j.apcata.2017.05.010pt_PT
dc.identifier.issn0926-860X
dc.identifier.urihttp://hdl.handle.net/10400.21/7385
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relation.publisherversionhttps://ac.els-cdn.com/S0926860X17302004/1-s2.0-S0926860X17302004-main.pdf?_tid=9223e268-9f8f-11e7-a638-00000aab0f27&acdnat=1506082644_e780a7a1fc010ce40dd34d2566cd9022pt_PT
dc.subjectNanosized SAPO-11pt_PT
dc.subjectMicrowavept_PT
dc.subjectSi sourcept_PT
dc.subjectAciditypt_PT
dc.subjectHydroisomerizationpt_PT
dc.subjectN-decanpt_PT
dc.titleMicrowave synthesis of SAPO-11 materials for long chain n-alkanes hydroisomerization: effect of physical parameters and chemical gel compositionpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage37pt_PT
oaire.citation.startPage28pt_PT
oaire.citation.titleApplied Catalysis A-Generalpt_PT
oaire.citation.volume542pt_PT
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT

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