Bond energy of surface oxygen in multicomponent oxide catalysts for propylene oxidation to acrolein

1986 ◽  
Vol 32 (1) ◽  
pp. 171-175 ◽  
Author(s):  
V. M. Bondareva ◽  
T. V. Andrushkevich ◽  
Yu. D. Pankratiev
Keyword(s):  
Bond Energy ◽  
Oxide Catalysts ◽  
Surface Oxygen ◽  
Propylene Oxidation ◽  
Multicomponent Oxide

Bond energy of surface oxygen on copper-magnesium oxide catalysts

1978 ◽  
Vol 8 (1) ◽  
pp. 65-70 ◽  
Author(s):  
V. Yu. Aleksandrov ◽  
V. V. Popovskii ◽  
N. N. Bulgakov
Keyword(s):  
Magnesium Oxide ◽  
Bond Energy ◽  
Oxide Catalysts ◽  
Surface Oxygen

Anomalously Low Bond Energy of Surface Oxygen on FeZSM-5 Zeolite

1991 ◽  
Vol 1 (1) ◽  
pp. 29-30 ◽  
Author(s):  
Vladimir I. Sobolev ◽  
Olga N. Kovalenko ◽  
Aleksandr S. Kharitonov ◽  
Yurii D. Pankrat’ev ◽  
Gennadii I. Panov
Keyword(s):  
Bond Energy ◽  
Surface Oxygen

Propylene oxidation over tin-molybdenum oxide catalysts

1977 ◽  
Vol 7 (1) ◽  
pp. 65-68 ◽  
Author(s):  
T. G. Alkhazov ◽  
K. Yu. Adzhamov ◽  
F. M. Poladov
Keyword(s):  
Molybdenum Oxide ◽  
Oxide Catalysts ◽  
Propylene Oxidation

scholarly journals Performance controlled via surface oxygen-vacancy in Ti-based oxide catalyst during methyl oleate epoxidation

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Supareak Praserthdam ◽  
Meena Rittiruam ◽  
Kanokpon Maungthong ◽  
Tinnakorn Saelee ◽  
Siriwimol Somdee ◽  
...  
Keyword(s):  
Active Region ◽  
Oxygen Vacancy ◽  
Methyl Oleate ◽  
Active Site ◽  
Catalyst Deactivation ◽  
Energy Gap ◽  
Oxide Catalysts ◽  
Surface Oxygen ◽  
Spent Catalyst ◽  
Surface Oxygen Vacancy

Abstract The catalytic performance with high conversion and high selectivity of Ti-based oxide catalysts have been widely investigated. Besides, stability, which is an essential parameter in the industrial process, lacked fundamental understanding. In this work, we combined computational and experimental techniques to provide insight into the deactivation of P25 and TS-1 Ti-based oxide catalysts during the methyl oleate (MO) epoxidation. The considered deactivation mechanisms are fouling and surface oxygen vacancy (OV). The fouling causes temporary catalyst deactivation through active site blockage but can be removed via calcination in air at high temperature. However, in this work, the OV formation plays an important role in the overall performance of the spent catalyst as the deactivated catalyst after regeneration, cannot be restored to the initial activity. Also, the effects of OV in spent catalysts caused (i) the formation of more Ti3+ species on the surface as evident by XPS and Bader charge analysis, (ii) the activity modification of the active region on the catalyst surface as the reduction in energy gap (Eg) occurred from the formation of the interstates observed in the density of states profiles of spent catalyst modeled by the O-vacant P25 and TS-1 models. This reduction in Eg affects directly the strength of Ti–OOH active site and MO bonding, in which high binding energy contributes to a low conversion because the MO needed an O atom from Ti–OOH site to form the methyl-9,10-epoxy stearate. Hence, the deactivation of the Ti-based oxide catalysts is caused not only by the insoluble by-products blocking the active region but also mainly from the OV. Note that the design of reactive and stable Ti-based oxide catalysts for MO epoxidation needed strategies to prevent OV formation that permanently deactivated the active region. Thus, the interrelation and magnitude between fouling and OV formation on catalyst deactivation will be investigated in future works.

Activity and bond strength of surface oxygen in vanadium oxide catalysts for methanol oxidation

1985 ◽  
Vol 27 (1) ◽  
pp. 173-176 ◽  
Author(s):  
Yu. D. Pankratiev ◽  
L. N. Kurina ◽  
T. V. Lazareva ◽  
S. P. Rabota
Keyword(s):  
Bond Strength ◽  
Vanadium Oxide ◽  
Methanol Oxidation ◽  
Oxide Catalysts ◽  
Surface Oxygen
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