Advances in Catalysis, Vol. 11 by P.W. Selwood, and Paul B. Weisz. D.D. Eley

By P.W. Selwood, and Paul B. Weisz. D.D. Eley

Catalysis is still a desirable assembly flooring of information and adventure, of theories and of experimentation belonging to numerous disciplines of technology. Catalysis isn't a technology, it's a phenomenon. it will possibly come up in reference to a necessary biochemical approach, an industrially very important chemical response, an enticing intramolecular rearrangement, a meson-influenced nuclear switch, a combustion approach, an atomic spin transmutation, or innumerable different rale procedures. The phenomenon of catalysis arises in reference to many clinical endeavors, and it consists of many and various clinical rules. during this quantity of the Advances in Catalysis and comparable topics, we have now persevered our try and gather development and built-in wisdom towards a greater clinical knowing of catalyzed price strategies.

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Purification of the gas released at high temperature, by washing at -78" in order to separate the solvent and other hydrocarbons having an high molecular weight, which are entrained by the gas. Combustion of the gas released. Absorption of the COa on Ba(0H)Z. Determination of the 14C/12Cratio in the BaC03. The radioactivity measurements of BaC03 allowed us to calculate, according to the law of the isotope dilution, the amount of ethyl groups, fixed on the a-titanium trichloride surface. The results obtained in such tests, in the interval - 18-+ loo", for the considered system a-titanium trichloride-triethylaluminum and a t 70" for the considered system a-titanium trichloride-diethylaluminum monochloride, are tabulated in Table X (49).

The rates observed at different temperatures, referred * I n our kinetic calculations, we refer t o the directly observed partial pressure of propylene, rather than to its fugacity, because over the temperature and pressure range examined, we can assume that partial pressures and fugacities are pructicully proportional. 97 a t 30" and 2700 mm. 99 a t 70"and 450 mm. Hg of propylene partial pressure). 16. Dependency of propylene polymerization rate in steady-state conditions on the amount of a-TiCla (sample A ) in the catalytic system.

3. Polymeric Isotactic Chains Bound lo the Aluminum Determinations of aluminum have been carried out on fractions of polymeric product containing isotactic chains deriving from the polymerization. These measurements were performed in an attempt to establish whether the chain transfer process, depending on the alkylaluminum concentration, leads to the formation of macromolecules which remain bound to the aluminum. The polymer has been therefore purified by physical methods from the unreacted ethylaluminum and from the heterogeneous catalyst.

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