CINECA IRIS Institutional Research Information System
IRIS è la soluzione IT che facilita la raccolta e la gestione dei dati relativi alle attività e ai prodotti della ricerca. Fornisce a ricercatori, amministratori e valutatori gli strumenti per monitorare i risultati della ricerca, aumentarne la visibilità e allocare in modo efficace le risorse disponibili.
EnglishThe oxidn. of n-butane (I) [106-97-8] at low and high hydrocarbon concn. is studied on a V(IV)-P (1:1) mixed oxide in relation to surface modification induced by the reaction medium. Butenes and butadiene [106-99-0] are formed from I at high I concn. with total consumption of inlet O; the formation of olefins from I is not obsd. when there is incomplete O consumption at low I concn. Under conditions in which formation of olefins is max., available evidence shows the presence in the catalyst of high amts. of V(III) together with V(IV) and the absence of V(V); in contrast, maleic anhydride (II) [108-31-6] is formed when lower amts. of V(III) together with both V(IV) and V(V) are found. It is suggested that 2 redox couples operate in the synthesis of II: (1) V(IV)-V(III) in the synthesis of olefins from I, and (2) V(V)-V(IV) in the synthesis of II from the olefins formed. At high I concns. and total O consumption, the lower d. of oxidizing sites for the second reaction limits the rate of further oxidn. of butenes to II, thus providing evidence for their formation from I. [on SciFinder(R)]
| Titolo: | On the mechanism of n-butane oxidation to maleic anhydride: oxidation in oxygen-stoichiometry-controlled conditions |
| Autori: | |
| Data di pubblicazione: | 1984 |
| Rivista: | |
| Abstract: | The oxidn. of n-butane (I) [106-97-8] at low and high hydrocarbon concn. is studied on a V(IV)-P (1:1) mixed oxide in relation to surface modification induced by the reaction medium. Butenes and butadiene [106-99-0] are formed from I at high I concn. with total consumption of inlet O; the formation of olefins from I is not obsd. when there is incomplete O consumption at low I concn. Under conditions in which formation of olefins is max., available evidence shows the presence in the catalyst of high amts. of V(III) together with V(IV) and the absence of V(V); in contrast, maleic anhydride (II) [108-31-6] is formed when lower amts. of V(III) together with both V(IV) and V(V) are found. It is suggested that 2 redox couples operate in the synthesis of II: (1) V(IV)-V(III) in the synthesis of olefins from I, and (2) V(V)-V(IV) in the synthesis of II from the olefins formed. At high I concns. and total O consumption, the lower d. of oxidizing sites for the second reaction limits the rate of further oxidn. of butenes to II, thus providing evidence for their formation from I. [on SciFinder(R)] |
| Handle: | http://hdl.handle.net/11570/1907393 |
| Appare nelle tipologie: | 14.a.1 Articolo su rivista |
File in questo prodotto:
Copyright © 2020