Effect of surface acid properties of HNO3 and NaOH modified VO_x/Al2O3 catalysts on methanol selective oxidation was studied by solid-state nuclear magnetic resonance and X-ray powder diffraction (XRD) spectroscopy. The surface acidity including type and strength of the acid sites in the ...
For example, the interface conduction remains unaffected when the capping alumina film is etched away by a 4-M aqueous NaOH solution. This strongly suggests that the effective charge carriers are mainly located on the STO side. Discussion As each layer of the (001)-oriented g-Al2O3/STO ...
Ceramic cutting inserts coated with ten-fold alternating micro- and nanocrystalline diamond (MCD/NCD) layers grown by hot filament chemical vapor deposition (CVD) were tested in the machining of an Al based metallic matrix composite (MMC) containing 15 v
For the adsorption kinetic studies, four spheres were used in 100 mL of 200 mg/L Cd+2 solution, keeping the pH constant at 5 by adding 0.1 M NaOH or HNO3 at room temperature. The equilibrium data obtained from the adsorption experiments were fitted on Pseudo first order (1), Pseudo ...
On the other hand, the basic catalysts usually used in the biodiesel industry (KOH, NaOH, and potassium and sodium methoxides) have important drawbacks [4]. Although they could be replaced by heterogeneous solid catalysts to make their re-utilization possible, some issues concerning those ...
Analysis of the inserts was performed before and after cleaning in a 30 vol % NaOH solution to remove the Al alloy built up at the cutting edge. Table 3. Overall set parameters used in the metallic matrix composite (MMC) turning. Insert v (m·min−1) f (mm·rev−1) DOC (mm) ...