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Methoxylation of α-pinene over heteropolyacids immobilized in silica

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Title: Methoxylation of α-pinene over heteropolyacids immobilized in silica
Authors: Pito, D.S.1, Matos, I.2, Fonseca, I.M.2 iss@dq.fct.unl.pt, Ramos, A.M.2, Vital, J.2, Castanheiro, J.E.1 jefc@uevora.pt
Source: Applied Catalysis A: General. Jan2010, Vol. 373 Issue 1/2, p140-146. 7p.
Subjects: Pinene, Silica, Methyl ether, Phosphoric acid, Chemical kinetics, Catalysts
Abstract: Abstract: The methoxylation of α-pinene was studied using heteropolyacids immobilized on silica as catalysts, at 60°C, being the α-terpinyl methyl ether the main product. Tungstophosphoric acid (PW), molybdophosphoric acid (PMo), tungstosilicic acid (SiW) and molybdosilicic acid (SiMo) were immobilized on silica by sol–gel method. It was observed that the catalytic activity of the silica-supported heteropolyacids decreases in the series: PW2_S>SiW_S>PMo_S>SiMo_S. A series of PW immobilized on silica with different PW loading were prepared. It was observed that the catalytic activity increases with the amount of PW immobilized on silica. However, at high amount of PW on silica, a decrease of the catalytic activity was observed. Good values of selectivity to α-terpinyl methyl ether (about 60% near complete conversion) were obtained with all catalysts. Catalytic stability of the PW2_S was evaluated by performing consecutive batch runs with the same catalyst sample. After the third batch it was observed a stabilisation of the initial activity. A kinetic model was developed assuming that the α-pinene is consumed according to the parallel reaction network. It was observed that the kinetic model fits the experimental concentration data quite well. [Copyright &y& Elsevier]
Copyright of Applied Catalysis A: General is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 47149977
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PubType: Academic Journal
PubTypeId: academicJournal
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Items – Name: Title
  Label: Title
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  Data: Methoxylation of α-pinene over heteropolyacids immobilized in silica
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  Data: <searchLink fieldCode="AR" term="%22Pito%2C+D%2ES%2E%22">Pito, D.S.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Matos%2C+I%2E%22">Matos, I.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Fonseca%2C+I%2EM%2E%22">Fonseca, I.M.</searchLink><relatesTo>2</relatesTo><i> iss@dq.fct.unl.pt</i><br /><searchLink fieldCode="AR" term="%22Ramos%2C+A%2EM%2E%22">Ramos, A.M.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Vital%2C+J%2E%22">Vital, J.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Castanheiro%2C+J%2EE%2E%22">Castanheiro, J.E.</searchLink><relatesTo>1</relatesTo><i> jefc@uevora.pt</i>
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  Data: <searchLink fieldCode="JN" term="%22Applied+Catalysis+A%3A+General%22">Applied Catalysis A: General</searchLink>. Jan2010, Vol. 373 Issue 1/2, p140-146. 7p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Pinene%22">Pinene</searchLink><br /><searchLink fieldCode="DE" term="%22Silica%22">Silica</searchLink><br /><searchLink fieldCode="DE" term="%22Methyl+ether%22">Methyl ether</searchLink><br /><searchLink fieldCode="DE" term="%22Phosphoric+acid%22">Phosphoric acid</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+kinetics%22">Chemical kinetics</searchLink><br /><searchLink fieldCode="DE" term="%22Catalysts%22">Catalysts</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Abstract: The methoxylation of α-pinene was studied using heteropolyacids immobilized on silica as catalysts, at 60°C, being the α-terpinyl methyl ether the main product. Tungstophosphoric acid (PW), molybdophosphoric acid (PMo), tungstosilicic acid (SiW) and molybdosilicic acid (SiMo) were immobilized on silica by sol–gel method. It was observed that the catalytic activity of the silica-supported heteropolyacids decreases in the series: PW2_S>SiW_S>PMo_S>SiMo_S. A series of PW immobilized on silica with different PW loading were prepared. It was observed that the catalytic activity increases with the amount of PW immobilized on silica. However, at high amount of PW on silica, a decrease of the catalytic activity was observed. Good values of selectivity to α-terpinyl methyl ether (about 60% near complete conversion) were obtained with all catalysts. Catalytic stability of the PW2_S was evaluated by performing consecutive batch runs with the same catalyst sample. After the third batch it was observed a stabilisation of the initial activity. A kinetic model was developed assuming that the α-pinene is consumed according to the parallel reaction network. It was observed that the kinetic model fits the experimental concentration data quite well. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Applied Catalysis A: General is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Text: English
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        Type: general
      – SubjectFull: Silica
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              Text: Jan2010
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