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Oxidative dehydrogenation of n-dodecane
136
Abstracts
The ethylidene group adjacent to two phenyl substituents, in the hydrocarbons examined, readily dehydrogenates at reduced temperatures (225-300~ on a P-2 catalyst ensuring a high conversion of raw material (64"9 ~ ) and high selectivity (93-8 ~ ) in synthesis of ct-phenylstyrene. Formation of by-products during the process involves demethylation and cracking. The benzene produced is mainly derived from the hydro-cracking of diphenylmethane and its substituted forms. OXIDATIVE DEHYDROGENATION OF n-DODECANE G . V. Isagulyants, O. D. Sterligov, S. V. A b e l ' s o n and L. V. F e d ' k o , N e f t e k h i m i y a 23, N o . 3, 331-334, 1983. TItE oxidative dehydrogenation of n-dodccane in the presence of oxygen, or its mixture with HCI and iron was studied using bismuth-molybdenum, titanium carbide (on pumice) catalysts. Molar ratios of reagents were varied under reaction conditions (temp. 450~ contact time 0.2-0-6 sec). Oxidative dehydrogenation of n-dodccane yielded n-dodecencs but also together with C~,-C~ ~ olefins. tlCI enhances the activity of the iron catalyst minimising the yield of C6-C~ 2 olefins (18.7 ~.o/) with good selectivity (80%) in dehydrogenation. Under these-conditions with a bismuth-molybdenum-phosphorus catalyst and titanium carbide, aromatization of the initial hydrocarbon becomes evident. COKE FORMATION ON BISMUTIt-IRON CATALYSTS IN OXII)AT1VE DEHYDRODIMERIZATION OF I'ROPYLENE G. N. P u g a l k i n a , A. S. V a a b e l ' and L. M. K a l i b ~ r d o , N e f t e k h i m i y a 23, N o . 3, 335-338, 1983. TIlE formation of coke during regeneration of a Bi-Fe oxide catalysts used for the oxidative dehydrodimerization of propylene has been studied. Coke-formation increases in step with a) reduction in oxygen content in the mixture oxidized (less than 5 vol.~), b) increasing contact time (over 3 see) and c) increasing reaction temperature. A catalyst coke content o f u p to 2 wt. Yo has no effect on activity or selectivity. During preparation of hexa-l,5-diene under optimum conditions on a Bi-Fe oxide catalyst, the latter self-regenerates with a coke content of 0-12 ~o. FLUORIDES OF ALKALI AND ALKALINE-EARTH M E T A L S - C A R R I E R S OF PLATINUM CATALYSTS IN DEIIYDROGENATION AND DEItYDROCYCLIZATION OF IIYDROCARBONS Yu. M. B o n d a r e v , Ye. A. S a u s h k i n a a n d Yu. S. M a r d a s h e v, N e f t e k h i m i y a 23, N o . 3, 339-342, 1983. TIlE catalytic properties of platinum deposited on ionic compounds of fluorine for dehydrogenation of cyclohexane and dehydrocyclization of hexane is studied. The condition of platinum at the surface of ionic fluorides depends on the carrier type and upon electron interaction of platinum with the surface of the carrier.
Abstracts
The ethylidene group adjacent to two phenyl substituents, in the hydrocarbons examined, readily dehydrogenates at reduced temperatures (225-300~ on a P-2 catalyst ensuring a high conversion of raw material (64"9 ~ ) and high selectivity (93-8 ~ ) in synthesis of ct-phenylstyrene. Formation of by-products during the process involves demethylation and cracking. The benzene produced is mainly derived from the hydro-cracking of diphenylmethane and its substituted forms. OXIDATIVE DEHYDROGENATION OF n-DODECANE G . V. Isagulyants, O. D. Sterligov, S. V. A b e l ' s o n and L. V. F e d ' k o , N e f t e k h i m i y a 23, N o . 3, 331-334, 1983. TItE oxidative dehydrogenation of n-dodccane in the presence of oxygen, or its mixture with HCI and iron was studied using bismuth-molybdenum, titanium carbide (on pumice) catalysts. Molar ratios of reagents were varied under reaction conditions (temp. 450~ contact time 0.2-0-6 sec). Oxidative dehydrogenation of n-dodccane yielded n-dodecencs but also together with C~,-C~ ~ olefins. tlCI enhances the activity of the iron catalyst minimising the yield of C6-C~ 2 olefins (18.7 ~.o/) with good selectivity (80%) in dehydrogenation. Under these-conditions with a bismuth-molybdenum-phosphorus catalyst and titanium carbide, aromatization of the initial hydrocarbon becomes evident. COKE FORMATION ON BISMUTIt-IRON CATALYSTS IN OXII)AT1VE DEHYDRODIMERIZATION OF I'ROPYLENE G. N. P u g a l k i n a , A. S. V a a b e l ' and L. M. K a l i b ~ r d o , N e f t e k h i m i y a 23, N o . 3, 335-338, 1983. TIlE formation of coke during regeneration of a Bi-Fe oxide catalysts used for the oxidative dehydrodimerization of propylene has been studied. Coke-formation increases in step with a) reduction in oxygen content in the mixture oxidized (less than 5 vol.~), b) increasing contact time (over 3 see) and c) increasing reaction temperature. A catalyst coke content o f u p to 2 wt. Yo has no effect on activity or selectivity. During preparation of hexa-l,5-diene under optimum conditions on a Bi-Fe oxide catalyst, the latter self-regenerates with a coke content of 0-12 ~o. FLUORIDES OF ALKALI AND ALKALINE-EARTH M E T A L S - C A R R I E R S OF PLATINUM CATALYSTS IN DEIIYDROGENATION AND DEItYDROCYCLIZATION OF IIYDROCARBONS Yu. M. B o n d a r e v , Ye. A. S a u s h k i n a a n d Yu. S. M a r d a s h e v, N e f t e k h i m i y a 23, N o . 3, 339-342, 1983. TIlE catalytic properties of platinum deposited on ionic compounds of fluorine for dehydrogenation of cyclohexane and dehydrocyclization of hexane is studied. The condition of platinum at the surface of ionic fluorides depends on the carrier type and upon electron interaction of platinum with the surface of the carrier.