Abstract
The influence of sodium ions on the specific surface area of a NiO-Al2O3 catalyst in dependence of nickel loading (5, 10, and 20 wt% Ni), temperature of heat treatment (400, 700 and 1100oC) and the method of sample preparation was investigated. Low temperature nitrogen adsorption (LTNA), X-ray diffraction (XRD) and scanning electron microscopy (SEM) were applied for sample characterization. Dramatic differences in the specific surface area were registered between non-rinsed and rinsed Al2O3 and NiO-Al2O3 samples. The lagged sodium ions promote sintering of non-rinsed catalyst samples.
Highlights
The NiO-Al2O3 oxide system finds broad application in a number of important industrial catalytic processes as steam reforming, partial oxidation of methane, methanation of carbon monoxide and hydrogenation of unsaturated organics [1, 2]
BET specific surface area values of alumina samples are listed in Tab
The sample treated at 400oC has a 39 times smaller specific surface area than the corresponding alumina sample rinsed with distilled water
Summary
The NiO-Al2O3 oxide system finds broad application in a number of important industrial catalytic processes as steam reforming, partial oxidation of methane, methanation of carbon monoxide and hydrogenation of unsaturated organics [1, 2]. These catalysts have perspective in future technologies as dry reforming of methane with carbon dioxide [3, 4] and tri-reforming [5, 6]. Besides active nickel and a support, industrial catalysts often contain promoters. Alkali and alkaline-earth metal ions as catalyst promoters could prevent sulfur poisoning and the choking rate.
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