Dubreuil, Anne-Claire, Chainet, Fabien, de Sousa Bartolomeu, Rui Miguel , Marques Mota, Filipe, Janvier, Josselin and Lienemann, Charles-Philippe (2017) Understanding the impact of silicon compounds on metallic catalysts through experiments and multi-technical analysis. Comptes Rendus Chimie, 20 (1). pp. 55-66. ISSN 1631-0748
Full content URL: https://doi.org/10.1016/j.crci.2016.05.020
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(2017) C. R. Chimie 20, 55.pdf - Whole Document Available under License Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International. 1MB |
| Item Type: | Article |
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| Item Status: | Live Archive |
Abstract
The presence of silicon in petroleum products is a major issue due to its poisoning effect on catalysts. The aim of this work is to combine silicon speciation and poisoning tests. Cyclic siloxanes were the main silicon species found in petroleum products. Other silicon compounds, comprising reactive groups (hydroxy, methoxy and hydroperoxy), were also recovered but at trace levels using GC-ICP/MS. Five well-chosen silicon compounds were used to poison Pd/alumina catalysts. Only dimethoxydimethylsilane poisons Pd-catalysts while polydimethylsiloxane (PDMS) has no effect on their activities in buta-1,3-diene hydrogenation. Unexpectedly, triethylsilane, triethylsilanol and even octamethylcyclotetrasiloxane (D4) exhibit a promoting effect. An interpretation of the phenomena based on various characterizations is proposed.
| Keywords: | Silicon, Pd catalyst, Poison, Promoter, hydrogenation, speciation, octamethylcyclotetrasiloxane |
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| Subjects: | H Engineering > H830 Chemical Process Engineering F Physical Sciences > F110 Applied Chemistry H Engineering > H810 Chemical Engineering |
| Divisions: | College of Science > School of Chemistry |
| ID Code: | 53653 |
| Deposited On: | 09 Mar 2023 13:57 |
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