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Journals / Turkish Journal of Chemistry / 2015 / Cilt: 39 - Sayı: 3

Sustainable activity of hydrothermally synthesized mesoporous silicates in acetic acid esterification

VELİ ŞİMŞEK
LEVENT DEĞİRMENCİ
KIRALİ MÜRTEZAOĞLU
Pages
683–696
Publication Date
2015-08-13
DOI
—
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

The results indicated that the activity of SBA-15-S catalysts increased with increasing STA in the catalyst.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:A hydrothermal method was applied in the synthesis of mesoporous silicates containing silicotungstic acid (STA).
📊
Key Findings & Data:The synthesis procedures were developed by modification of procedures previously applied in the synthesis of MCM-41 and SBA-15.
💡
Conclusion & Impact:The results indicated that the activity of SBA-15-S catalysts increased with increasing STA in the catalyst.
🔬Design:Modeling & Simulation
📍Scope:Comprehensive Sample
⚙️Variables:Mesoporous silicate · silicotungstic acid · hydrothermal method

Abstract

A hydrothermal method was applied in the synthesis of mesoporous silicates containing silicotungstic acid (STA). The synthesis procedures were developed by modification of procedures previously applied in the synthesis of MCM-41 and SBA-15. The synthesized catalysts were named MCM-41-S and SBA-15-S based on MCM-41 and SBA-15. Their activities were investigated in ethyl acetate production, which was selected as the model reaction. The results indicated that the activity of SBA-15-S catalysts increased with increasing STA in the catalyst. Reaction experiments were also conducted in identical conditions in the presence of catalysts recovered after the reaction. The results indicated that sustainable activity could be achieved in the presence of these spent catalysts with activity losses around 10%. Evaluation of characterization analyses conducted with fresh and spent catalysts showed that the activity loss of SBA-15-S catalysts had merely been due to STA leaching, whereas deformation of pore structure had occurred in MCM-41-S catalysts.

Özet

A hydrothermal method was applied in the synthesis of mesoporous silicates containing silicotungstic acid (STA). The synthesis procedures were developed by modification of procedures previously applied in the synthesis of MCM-41 and SBA-15. The synthesized catalysts were named MCM-41-S and SBA-15-S based on MCM-41 and SBA-15. Their activities were investigated in ethyl acetate production, which was selected as the model reaction. The results indicated that the activity of SBA-15-S catalysts increased with increasing STA in the catalyst. Reaction experiments were also conducted in identical conditions in the presence of catalysts recovered after the reaction. The results indicated that sustainable activity could be achieved in the presence of these spent catalysts with activity losses around 10%. Evaluation of characterization analyses conducted with fresh and spent catalysts showed that the activity loss of SBA-15-S catalysts had merely been due to STA leaching, whereas deformation of pore structure had occurred in MCM-41-S catalysts.

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Cite This Article

ŞİMŞEK, V., DEĞİRMENCİ, L., MÜRTEZAOĞLU, K. (2015). Sustainable activity of hydrothermally synthesized mesoporous silicates in acetic acid esterification. Turkish Journal of Chemistry, Cilt: 39 - Sayı: 3, 683–696. https://ajindex.com/articles/184950

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