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Technische Katalyse by J Hagen

25 February 2017 adminGeneral Reference

By J Hagen

With out catalysts commercial construction, examine and environmental expertise might all be unthinkable. even though eighty% of all large-scale commercial techniques are catalytic, many scientists and engineers restrict themselves to continuing on empirical traces. they often don't own the fundamental wisdom for a scientific improvement and alertness of catalysts.

This e-book treats either homogeneous and heterogeneous catalysis - wherein certain emphasis is put on idustrial procedures whereas environmental points and fiscal info additionally obtain their reasonable of recognition. each one bankruptcy comprises many useful examples. What has been realized should be managed via routines. during this approach it really is now attainable for the 1st time to review technological catalysis independently utilizing this textbook with routines. The practitioner will locate worthwhile support, for example details bearing on statistical making plans of study or the simulation of catalytic reactors.

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Durch die extrem hohe Reaktivitat der gebildeten Verbindung Pt(PPh& wird dieser Konzentrationseffektjedoch uberdeckt. Es kommt zu einer vollstandigen Reaktion mit n-aciden Molekulen wie CO oder NO (Gl. 2-3): Die rasche Dissoziation vieler Komplexe erklart man gern mit der sterischen Hinderung der Liganden. Wenn die Raumerfillung der Phosphan- oder Phosphitliganden steigt, erhoht sich die Dissoziationsrate; als halbquantitatives Ma13 dafiir wird der von Tolman eingefiihrte Kegelwinkel des Liganden (Tab.

I Schliisselreaktionen der homogenen Katalyse 35 R = n-C3H7 > Et > Ph > Me $- CH 2Ph, CF3, C1 CO-Einschub bei R-Mn(C0)5, Reaktivitat Der Trend kann so gedeutet werden, dalj die elektronenliefernden Alkylgruppen als o-Donatoren eine starkere Polarisierung der Metall-Kohlenstoff-Bindungverursachen. Dieser a-Effekt wurde durch Modellrechnungen bestatigt [ ll. Vergleicht man Stabilitat und Reaktivitat der Metallkomplexe innerhalb einer Triade des PSE miteinander, so stellt man folgenden, gegenlaufigen Trend fest [3] : Stabilitat der M-C-Bindung, Polarisierbarkeit, Weichheit des Metalls Reaktivitat bei CO-Einschubreaktionen Die harteren, weiter oben stehenden ijbergangsmetalle sind hinsichtlich des CO-Einschubs reaktiver.

Die beidseitige Aktivierung von CO-Liganden schwacht die CO-Bindungsordnung und erniedrigt die CO-Streckfrequenz im IRSpektrum. Es wurde gefunden, dalj durch Lewissaure- oder Protonenzusatz eine Beschleunigung von CO-Einschubreaktionen erreicht werden kann, damit ist eine weitere Katalysatormodifizierungmoglich. Gemische aus ijbergangsmetallcarbonylen und Lewissauren konnten zukiinftig Interesse als Katalysatoren fiir die CO-Hydrierung, z. B. durch Fischer-Tropsch-Reaktion, gewinnen [Ll 11: H H I I M + IC ~ 0 1A+ _ M-C=OI + A (2-82) Der harte Elektronenakzeptor A reduziert die Elektronendichte in der CO-Einheit, der nucleophile Angriff des Hydrids auf den Carbonyl-Kohlenstoff wird somit erleichtert.

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