Understanding the impact of silicon compounds on metallic catalysts through experiments and multi-technical analysis

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• 作者：Anne-Claire Dubreuil ; ^{anne-claire.dubreuil@ifpen.fr} ; Fabien Chainet ; Rui Miguel de Sousa Bartolomeu ; Filipe Manuel Marques Mota ; Josselin Janvier ; Charles-Philippe Lienemann
• 关键词：Silicon ; Pd catalyst ; Poison ; Promoter ; Buta-1 ; 3-diene hydrogenation ; Speciation ; Octamethylcyclotetrasiloxane
• 刊名：Comptes Rendus Chimie
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：20
• 期：1
• 页码：55-66
• 全文大小：1823 K
• 卷排序：20

文摘

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.