Reference

Elementary reactions in the oxidation of alkenes

Elementary reactions in the oxidation of alkenes. Hoyermann, K.; Sievert, R. (Inst. Phys. Chem., Univ. Goettingen, Goettingen D-3400, Fed. Rep. Ger.). Ber. Bunsen-Ges. Phys. Chem., 87(11), 1027-31 (German) 1983. CODEN: BBPCAX. ISSN: 0005-9021. DOCUMENT TYPE: Journal CA Section: 50 (Propellants and Explosives) The reactions of OH radicals with the isomers of butene (1-butene [106-98-9], cis-2-butene [590-18-1], trans-2-butene [624-64-6], and isobutene [115-11-7]) were studied at low pressure using an isothermal flow reactor (295-298 K, p = 0.9-10 torr) and a Laval-nozzle reactor (p <0.1 torr). The OH radicals were produced via the reactions H/D + NO2 or F + H2O/D2O, hydroxybutyl radicals via the reactions F + BuOH [71-36-3], 2-butanol [78-92-2], sec-butanol [78-92-2], and tert-butanol [75-65-0]. Samples were withdrawn continuously by a mol.-beam sampling system and were analyzed mass spectrometrically, applying synchronous ion-counting and chem.-modulation techniques. The reaction mechanism is OH + C4H4 ? C4H8×OH* ? C4H8OH. Stabilization of the adduct is the main reaction at room temp. and ~1 torr, and abstraction reactions are negligible. The reaction mechanisms were analyzed in terms of addn./redissocn./stabilization/isomerization/decompn., using unimol. rate theory. The results were applied to prediction of product formation at conditions of tech. combustion processes.

Oxidative dehydrogenation of butenes to butadiene

Oxidative dehydrogenation of butenes to butadiene. Ogonowski, Jan (Inst. Chem. Technol. Org., Politech. Krakowska, Krakow, Pol. 106-98-9 and 7439-98-7 are also occured in this study.). Przem. Chem., 62(11), 610-12 (Polish) 1983. CODEN: PRCHAB. ISSN: 0033-2496. DOCUMENT TYPE: Journal CA Section: 39 (Synthetic Elastomers and Natural Rubber) Section cross-reference(s): 23 The effect of temp. and catalyst load was detd. on the formation of 1,3-butadiene [106-99-0] in dehydrogenation on a Mo-Bi catalyst of a mixt. comprising 1-butene (I) [106-98-9] 28.2, cis-2-butene (II) [590-18-1] 14.7, and trans-2-butene (III) [624-64-6] 56.5%. A decrease in the vol. of charged butenes from 164 to 41 mL (pulsed method, and of the catalyst 0.1 g) did not affect conversion (64.5%) and selectivity (94.5%). A further decrease in the vol. of charged butenes decreased the selectivity. At 693 K, the conversion and selectivity were 2.8 and 69%, resp. At 773 K, the corresponding values were 23.5 and 93.6%. Above 773 K, deep oxidn. became more significant. The reactivity of butenes increased in the sequence III < II < I. .