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کاتالیزور کاربردی a: عمومی 2012
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  • hydrogenation of nitriles to primary amines on metal-supported catalysts: highly selective conversion of butyronitrile to n-butylamine

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 992
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     the selective liquid-phase hydrogenation of butyronitrile to n-butylamine was studied in a batch reactor on co(9.8%)/sio2, ni(10.5%)/sio2, cu(9.2%)/sio2, pt(0.27%)/sio2, pd(0.33%)/sio2, and ru(1.8%)/sio2catalysts. at 373 k and 13 bar (h2), the initial butyronitrile conversion rate (view the mathml source, mmol/h g) followed the order ni > co > pt > ru > cu > pd. cu/sio2 and pd/sio2 did not form n-butylamine and rapidly deactivated during the progress of the reaction. pt/sio2 produced mainly dibutylamine and only minor amounts of n-butylamine and tributylamine. in contrast, ru/sio2 formed preponderantly n-butylamine but also produced significant amounts of dibutylamine and butylidene–butylamine, an intermediate in the formation pathway of the secondary amine. the highest yield to n-butylamine was obtained on ni/sio2 (84%). co/sio2 was initially highly selective to n-butylamine but with the progress of the reaction the butylamine concentration in the reaction mixture diminished because it partially reacted with the solvent (ethanol) to form n-ethylbutylamine. in an attempt to reduce the formation of byproducts, ni/sio2 and co/sio2 catalysts were tested at lower temperatures and higher h2 pressures. butyronitrile was selectively converted to n-butylamine on co/sio2 at 343 k and 25 bar, yielding 97% of n-butylamine, similarly to the highest yields reported on raney co catalysts.

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