کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
40950 45872 2012 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Nanospace constraints in mesoporous silica carriers—A factor of critical importance in promoting the catalytic activity of supported ruthenium (II) complex with hemilabile phosphine ligand
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Nanospace constraints in mesoporous silica carriers—A factor of critical importance in promoting the catalytic activity of supported ruthenium (II) complex with hemilabile phosphine ligand
چکیده انگلیسی

Various mesoporous silica materials (FSM-16, HMS, SBA-15) aluminated via direct procedure or by a post-synthesis treatment, differing in the manner of Al distribution between the external surface and the mesoporous network, were employed for the immobilization of [(η5-MeC5H4)Ru(η3-DPVP)(η1-DPVP)]+ (DPVP = PPh2CHCH2) complex. The catalysts of similar loading (ca. 5 wt.%) of Ru-species were prepared by means of cation exchange. The samples were characterized with XRD, XPS, MAS NMR, N2 adsorption/desorption techniques and quantum chemical calculations, and tested in the liquid phase hydrogenation of phenylacetylene. Two binding modes of Ru species were identified: (i) at the surface free of spatial constraints, with the participation of the hemilabile ligand in the electrostatic attraction and (ii) in the limited space of narrow mesopores, via peripheral areas of Ru coordination sphere, leaving hemilabile phosphine exposed to the reaction medium. It has been demonstrated that the latter location is a prerequisite of high catalytic activity of the supported system, while the former destroys the catalytic action.

Figure optionsDownload high-quality image (134 K)Download as PowerPoint slideHighlights
► Hemilabile Ru complex is immobilized on various mesoporous silica materials.
► The binding mode of Ru complex to the support influences catalytic activity.
► Location of Ru complex within the porous network results in high catalytic activity.
► 31P MAS NMR is a diagnostic tool for prediction of the supported catalyst activity.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Catalysis A: General - Volumes 427–428, 15 June 2012, Pages 16–23
نویسندگان
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