Catalytic activity of mesoporous Ga-SBA-15 materials in α-pinene isomerisation: Similarities and differences with Al-SBA-15 analogues

Performances of Ga-SBA-15 materials with different Si/Ga ratios prepared either by grafting or direct synthesis are compared with those of Al-SBA-15 analogues. Undeniably Ga-SBA-15 solids allow better yields of camphene + limonene and limit the production of heavy undesirable by-products. After a th...

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Bibliographic Details
Published inApplied catalysis. A, General Vol. 368; no. 1; pp. 132 - 138
Main Authors Launay, F., Jarry, B., Bonardet, J.L.
Format Journal Article
LanguageEnglish
Published Kidlington Elsevier B.V 31.10.2009
Elsevier
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Summary:Performances of Ga-SBA-15 materials with different Si/Ga ratios prepared either by grafting or direct synthesis are compared with those of Al-SBA-15 analogues. Undeniably Ga-SBA-15 solids allow better yields of camphene + limonene and limit the production of heavy undesirable by-products. After a thermal treatment, recycled Ga-SBA-15 solids turn out to be as active as the fresh catalyst. A complete investigation of the catalytic activity of Ga-SBA-15 materials in α-pinene isomerisation is presented here. The performances of solids with different Si/Ga ratios prepared either by grafting or direct synthesis are compared with those of Al-SBA-15 analogues. In the case of Ga samples prepared by direct synthesis, α-pinene conversion can reach 90%, in relatively mild experimental conditions (353 K, 1 h). Camphene and limonene represent more than 50% of the products formed. In the case of samples prepared by post-synthesis, α-pinene conversion decreases with the Ga content, but remains much higher than with the corresponding Al-SBA-15 materials. In this latter case, heavy compounds are the main products and can correspond to more than 50% of the isomerised α-pinene. Undeniably Ga-SBA-15 solids allow better yields of camphene + limonene and limit the production of heavy undesirable by-products.
ISSN:0926-860X
1873-3875
DOI:10.1016/j.apcata.2009.08.022