Lithium chemistry of lithium doped magnesium oxide catalysts used in the oxidative coupling of methane
نویسندگان
چکیده
منابع مشابه
Lithium Chemistry of Lithium Doped Magnesium Oxide Catalysts Used in the Oxidative Coupling of Methane a
Active sites are created on the surface of a Li/MgO catalyst used for the selective oxidation of methane by the gradual loss of carbondioxide from surface carbonate species in the presence of oxygen. Decomposition of the carbonat~ species in the absence of oxygen is detrimental to the activity of the cataIy~t. The active sites'created are not stable but disappear either as a result of reaction ...
متن کاملEffect of Additives on Lithium Doped Magnesium Oxide Catalysts Used in the Oxidative Coupling of Methane
It has been found that it is possible to improve the activity and stability for the oxidative coupling of methane of a Li/MgO catalyst by the addition of small amounts of the oxides of various transition and rare earth metals. A number of these additives, e.g. SnOZ, TiOz, Dy,O, and Tb407, caused little or no difference in the selectivity to C, products achieved with the resultant catalyst while...
متن کاملThe oxidative coupling of methane and the oxidative dehydrogenation of ethane over a niobium promoted lithium doped magnesium oxide catalyst
The promoting effect of niobium in a Li/MgO catalyst for the oxidative coupling of methane (OCM) and for the oxidattve dehydrogenation of ethane (ODHE) has been studied in some detail. it has been found that a Li/Nb/MgO catalyst with 16 wt % niobium showed the highest activity for the C, production in the OCM reaction; the activity at 600 “C was ten times that of the Li/MgO catalyst at the same...
متن کاملPeriodic poling of magnesium-oxide-doped lithium niobate
In this article, poling characteristics and periodic poling of magnesium-oxide-doped lithium niobate ~MgLN! are described. Periodic poling was done by the electric field method, with which uniform gratings were produced. The domain wall velocity as a function of poling field was measured and used to determine conditions for self-terminating periodic poling. A computational model for the self-te...
متن کاملOxidative coupling of methane over doped Li/MgO catalysts
A series of zirconia doped Li/MgO catalysts with a fixed amount of zirconia and varying concentrations of lithium was used for the oxidative coupling of methane. It was found that an increase in lithium concentration resulted in a decrease in initial activity, while the selectivity was not affected. The life-time of Zr doped Li/MgO catalysts with a fixed concentration of ZrOz is a function of t...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Applied Catalysis
سال: 1990
ISSN: 0166-9834
DOI: 10.1016/s0166-9834(00)82283-6