Ammoxidation of methylpyrazine over phosphorus-modified vanadium-titanium catalysts |
| |
Authors: | VM Bondareva TV Andrushkevich OB Lapina AA Vlasov and LS Dovlitova |
| |
Institution: | (1) Boreskov Institute of Catalysis, Novosibirsk, 630090, Russia |
| |
Abstract: | Vanadium-titanium catalysts modified with phosphorus additives (1-15 wt.% of P2O5) have been studied in methylpyrazine ammoxidation. Introduction of high amounts of the additive (≥ 10 wt.% of P2O5) results in a decrease in activity and selectivity of the catalysts due to formation of low active phase - a ternary compound
with the component ratio V : P : Ti ≈ 1 : 1 : 1 with only one type of slightly distorted tetrahedral vanadium (5+) bound via
oxygen to phosphorus (5+). The nature of the active sites of the samples modified with 1-5 wt.% of P2O5, similarly to that in the V-Ti-O catalyst, was found to include the V5+ cations strongly bound with TiO2 and located in the significantly distorted octahedral oxygen environment.
This revised version was published online in June 2006 with corrections to the Cover Date. |
| |
Keywords: | methylpyrazine ammoxidation vanadium-titanium modified catalysts phosphorus additives |
本文献已被 SpringerLink 等数据库收录! |