STUDY OF THE SURFACE ACIDITY OF ZEOLITE BY TEMPERATURE PROGRAMMED DESORPTION (TPD) Ⅱ.TPD SPECTRA OF n-BUTYLAMINE ADSORBED ON NaY TYPE ZEOLITES WITH DIFFERENT EXCHANGE-PERCENTAGE OF Na~+ WITH Ca~(2+) AND NH_4~+
Under the existence of sulfocyanate in the acidic property mediu,by the reduction to the yellow complex,the wave-length is the most intelligent in 404nm and the content of the tungsten at 0~1.50% scopes which conforms to the Beer′s law has a good selectivity.
The acidity and catalytic activity of Y type zeolites are not mainly determined by cation ions, Al(OH)3-xx+, it appears that the principal source of acidic property of thermal decomposed NH4Y type zeolite is the skeleton proton.
The acidic properties of the 2-position H of 1-n-butyl-3-methylimidazolium chloride ([bmim]Cl) were measured by titration, FT-IR, and 1H NMR analysis. The 2-H signal at a chemical shift of 9.5 disappeared completely and KCl was produced after titration with KOH solution, implying the significant Brnsted acidic property of the 2-H.
On the basis of total acid hydrolysis, methylation analysis, periodate oxidation and NMR studies (1H and 13C) the structure of the repeating unit of the polysaccharide was assigned and indicated only α-(1→4) linked Glucan.
The anticholinergic activity was incorporated into the intact esters to overcome the gastric toxicity of indomethacin, not only by blocking the acidic functionality but also by decreasing gastric secretions and motility.
In a weak acidic medium, the reaction of some aminoglycoside antibiotics (AGs) such as kanamycin sulfate (KANA), gentamycin sulfate (GEN), and tobramycin sulfate (TOB) with acid thiazolyl bisazo dye Titan Yellow (TY) can result in the fading of TY.
On the condition of weak acidity, the sensitive layer was prepared by electropolymerization of o-aminophenol on a gold electrode in the presence of the template (nicotine).
This effect of oxytocin may be mediated through the vagus and sympathetic nerve, and then lead to the reduction of gastric juice output and the depression of gastric acidity.
The NH3-TPD characterization was conducted to confirm that the acidity of Mo-Fe/HZSM-5 zeolite could be selectively modified via the glow discharge plasma treatment.
The results of vapor-phase oxidation of methanol are discussed on the basis of the acidic property, oxidizing functions, and the crystallographic structure of the catalysts.
The weak acidic property of fulvic acids due to carboxyl groups resulted in buffering over a wide range of pH; fulvic acids were completely neutralized in the pH range of 7.00-8.85.