EXAFS investigation of the morphology of immobilized Rh(PPh(3))(3)Cl on phosphinated MCM-41

NCU Institutional Repository > 理學院 > 化學學系 > 期刊論文 > Item 987654321/50706

請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/50706

題名:	EXAFS investigation of the morphology of immobilized Rh(PPh(3))(3)Cl on phosphinated MCM-41
作者:	Chang,JR;Lin,HM;Cheng,SW;Tseng,CK;Tzou,DL;Shyu,SG
貢獻者:	化學學系
關鍵詞:	TRANSITION-METAL COMPLEXES;ABSORPTION FINE-STRUCTURE;MESOPOROUS MOLECULAR-SIEVE;CATALYTIC-HYDROGENATION;DONOR LIGANDS;SILICA;SUPPORT;HYDROFORMYLATION;CYCLOHEXENE;OXIDATION
日期:	2010
上傳時間:	2012-03-27 18:08:22 (UTC+8)
出版者:	國立中央大學
摘要:	Rh(PPh(3))(3)Cl was immobilized on a (OEt)(3)Si(CH(2))(3)PPh(2) modified MCM-41 to form a stable hydrogenation catalyst. The morphology of the catalyst was characterized by X-ray absorption spectroscopy. The EXAFS results indicates that the immobilized Rh catalyst has an average Rh-O(s) (O(s) is a surface oxygen) and Rh-Si bond distances of 2.01 angstrom and 3.15 angstrom, respectively, suggesting that monomeric Rh complex bonds to the MCM-41 surface. However, the structure of the immobilized Rh complex is not retained after hydrogenation of cyclohexene at 75 degrees C under 150 psi of H(2). After the reaction, the presence of Rh-Rh contribution with average bond distance of 2.68 angstrom and coordination number of 1.3 and the missing contribution with bond distance of 3.85 angstrom suggest that the reaction induces the coalescence of Rh complex to form dimeric Rh species. However, formation of trace amount of Rh metal clusters cannot be ruled out because rather small characteristic peak for the missing Rh-Rh shell may be covered by noise. (C) 2010 Elsevier B.V. All rights reserved.
關聯:	JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
顯示於類別:	[化學學系] 期刊論文

文件中的檔案:

檔案	描述	大小	格式	瀏覽次數
index.html		0Kb	HTML	530	檢視/開啟

在NCUIR中所有的資料項目都受到原著作權保護.

社群 sharing

資料載入中.....