Topic
Isopropyl alcohol
About: Isopropyl alcohol is a research topic. Over the lifetime, 3064 publications have been published within this topic receiving 27354 citations. The topic is also known as: Rubbing Alcohol & Propan-2-ol.
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TL;DR: In this article, XPS and EDX-STEM techniques have been used to characterize the nature of the molybdenum species as a function of Mo loading, showing that the catalysts are acidic as evidenced by isopropyl alcohol dehydration into propene at low Mo content and their activity increased with Mo content following the amount of MoO2-4 species.
Abstract: Molybdenum species have been deposited on a high surface area silica by the impregnation method and further calcination at 500 °C in air. Mo loading was varied from 0–10 wt % Mo. I.r., u.v.–visible, XPS and EDX-STEM techniques have been used to characterize the nature of the molybdenum species as a function of Mo loading. At low Mo content ( < 3 wt % Mo) interaction between silanol groups and molybdate ions occurred resulting in the formation of monomeric tetrahedral MoO2–4 species with a u.v. band near 245 nm. For intermediate loadings (3–8 wt %) polymeric octahedral molybdate species were identified with a u.v. band near 340 nm. At high Mo content crystallites of MoO3 were also observed. Catalytic properties for both isopropyl alcohol conversion in air at 100 °C and propene oxidation at 400 °C were studied as a function of Mo loading. It was observed that the catalysts are acidic as evidenced by isopropyl alcohol dehydration into propene at low Mo content and their activity increased with Mo content following the amount of MoO2–4 species. Polymeric molybdate species were observed to exhibit mainly redox-type properties as evidenced by isopropyl alcohol oxidative dehydrogenation into acetone and by propene oxidation into propanal (electrophilic attack) and into acrolein (allylic-type reaction). MoO3 crystallites were observed to exhibit usual properties of unsupported MoO3 catalysts.
48 citations
TL;DR: In this paper, the authors investigated the adsorption of two cationic dyes, crystal violet (CV) and ethyl violet (EV), by kaolinite by normal and comparative electronic spectroscopy and found that both dyes were adsorbed to a greater extent from dilute aqueous solutions.
Abstract: Adsorption of two cationic dyes, crystal violet (CV) and ethyl violet (EV), by kaolinite has been investigated by normal and comparative electronic spectroscopy. It was found that adsorption of both dyes from dilute aqueous solutions resulted in metachromasy. Adsorption from organic solvents (isopropyl alcohol or glycerol) led to metachromasy with CV but not with EV. Adsorption from mixed water–organic solvents was dependent on both the cationic dye used and the composition of the solvent. Quantitative determinations showed that both dyes were adsorbed to a greater extent from aqueous solutions than from isopropyl alcohol or aqueous isopropyl alcohol solutions, with more CV than EV being adsorbed.
48 citations
TL;DR: In this paper, the effect of different solvents on the coating characteristics was studied and two of their properties, viscosity and volatility, were used to analyze the results obtained.
47 citations
TL;DR: In this paper, the adsorption of acetonitrile, methanol, isopropyl alcohol, isobutyl alcohol and water over Sn-BEA enriched with 119Sn isotope was investigated.
Abstract: 119Sn CPMG MAS NMR was applied to study the adsorption of acetonitrile, methanol, isopropyl alcohol, isobutyl alcohol, and water over Sn-BEA enriched with 119Sn isotope. Two signals observed at ca. −422 and −443 ppm over dehydrated samples were attributed to tetracoordinated framework tin sites with strong and weak Lewis acidity, respectively. The adsorption of acetonitrile and methanol resulted in the observation of pentacoordinated tin species, due to the formation of 1:1 adsorption complexes over both Sn sites. Water adsorption led first to formation of pentacoordinated tin species, which were further converted into hexacoordinated species at longer reaction times. The latter transformation was found to be kinetically limited and was attributed to chemical interaction of tin sites with water, such as hydrolysis of Si–O–Sn bonds. The adsorption of isopropyl alcohol and isobutyl alcohol was accompanied by the formation of pentacoordinated Sn species in the case of weak sites and hexacoordinated Sn over s...
47 citations
TL;DR: In this article, it was shown that the reaction proceeds by way of a compound of tetravalent or pentavalent chromium, and a mechanism for the oxidation has tentatively been suggested.
Abstract: The oxidation of isopropyl alcohol by chromic acid is a reaction first order with respect to the acid chromate ion, HCrO4−, first order with respect to the alcohol, and second order with respect to hydrogen ion Evidence has been obtained that the reaction proceeds by way of a compound of tetravalent or of pentavalent chromium On the basis of these facts, a mechanism for the oxidation has tentatively been suggested
47 citations