Nuclear Magnetic Resonance Studies of Fine Metallic Particles PDF Download
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Author: George Robinson Mather
Publisher:
ISBN:
Category : Gold
Languages : en
Pages : 536
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Book Description
Author: George Robinson Mather
Publisher:
ISBN:
Category : Gold
Languages : en
Pages : 536
Get Book Here
Book Description
Author: George Robinson Mather
Publisher:
ISBN:
Category : Gold
Languages : en
Pages : 536
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Author: Christopher Aaron Klug
Publisher:
ISBN:
Category :
Languages : en
Pages : 390
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Book Description
We have used NMR to study the structure and reactions of acetylene and ethylene adsorbed on small catalyst particles. By monitoring $\sp{13}$C-$\sp{13}$C and $\sp{13}$C-$\sp1$H dipolar couplings we found the carbon-carbon bond length to be 1.44 $\pm$ 0.02A for acetylene adsorbed on Rh clusters at room temperature and the surface species to consist mostly of CCH$\sb2$ with a small amount of CCH. Using $\sp2$H NMR we studied the conversion of ethylene adsorbed at low temperatures on Pt clusters to the stable room temperature species (CCH$\sb3$) and also the hydrogen-deuterium exchange in this CCH$\sb3$ species. We found an activation energy of 15.2 $\pm$ 2.0 kcal/mole and preexponential factor of 10$\sp{7{\pm}1.7}$ sec$\sp{-1}$ for the conversion reaction and an activation energy of 14.3 $\pm$ 2.5 kcal/mole and preexponential factor of 4 $\times$ 10$\sp{7{\pm}2}$ sec$\sp{-1}$ for the exchange reaction. We compare these results with those obtained by other researchers. We also studied the formation of CCH$\sb3$ from the stable room temperature species of acetylene adsorbed on Pt (CCH$\sb2$) and found an activation energy of 9.3 $\pm$ 2.5 kcal/mole and a preexponential factor of 10$\sp{3{\pm}2}$ sec$\sp{-1}$torr$\sp{-1}$. In addition, we used measurements of $\sp{13}$C-$\sp1$H dipolar couplings to monitor the hydrogen population for the surface species formed from acetylene adsorbed on Pt and Ir. We were able to show that the CCH$\sb2$ species do not lose hydrogen prior to carbon-carbon bond scission on Ir but that there is a gradual dehydrogenation below the temperature of carbon-carbon bond scission for CCH$\sb2$ species on Pt.
Author: Anasapurapu Srinivasa Rao
Publisher:
ISBN:
Category : Solids
Languages : en
Pages : 240
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Author: Theodore Justin Rowland
Publisher:
ISBN:
Category : Nuclear magnetic resonance
Languages : en
Pages : 112
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Author: Lieven Gerven
Publisher: Springer Science & Business Media
ISBN: 146842808X
Category : Science
Languages : en
Pages : 433
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Author: Richard Edwin Poulson
Publisher:
ISBN:
Category : Fluorides
Languages : en
Pages : 62
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Author: Lawrence Que
Publisher:
ISBN:
Category :
Languages : en
Pages : 264
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Author: Vladimir M. Gun'ko
Publisher: CRC Press
ISBN: 1466551690
Category : Science
Languages : en
Pages : 1035
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Book Description
Properties and applications of high surface area materials depend on interfacial phenomena, including diffusion, sorption, dissolution, solvation, surface reactions, catalysis, and phase transitions. Among the physicochemical methods that give useful information regarding these complex phenomena, nuclear magnetic resonance (NMR) spectroscopy is the
Author: Cynthia Ann Muñoz Powers
Publisher:
ISBN:
Category : Chemistry, Analytic
Languages : en
Pages : 132
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Book Description
