Catalytic transfer hydrogenation of 2-butanone over oxide catalysts

Abstract

Catalytic transfer hydrogenation of 2-butanone with 2-propanol was studied in gas phase over a series of oxides of different acid-base properties. Although the basic oxides (MgO, La203) gave high initial conversions, these oxides underwent deactivation during the reaction. This deactivation could be partially prevented by a previous treatment with chloroform of the oxide. The amphoteric oxides (TiO2, ZrO2, Al203) were also active in this reaction. Increasing the acidic character of the catalyst (Nb2Os, WO3) led to a pronounced dehydration of 2-propanol. The results obtained over a series of rare earth oxides (La203, Sm203, Gd203, Dy203, Er203) revealed that beside the role of basic and acid sites a correlation seems to exist between the number of unpaired electrons of the metal ion and the catalytic activity, indicating the role of one electron donor sites.

Heterogeneous Catalysis in the Meerwein-Ponndorf-Verley Reduction of Carbonyl Compounds

“…Szöllösi and Bartok conducted a comprehensive study of the reaction in the gas phase using MgO [20][21][22][23][24] and found that deactivation of the catalyst during the reaction of various ketones with isopropanol could be avoided by treating the catalyst with carbon tetrachloride [20] or chloroform [21] prior to use; in this way, the initial catalytic activity was retained for as long as 65 h. This treatment is similar to that of chlorinated aluminas intended to increase the acidity. However, the acidity obtained with Mg 2+ ions was lower than that provided by Al 3+ ions, which Szöllösi and Bartok ascribed to the surface changes caused by chloroform in MgO blocking the Lewis acid sites amenable to poisoning and producing surface OH groups with acid properties for the reaction [22].…”

Low Detection Limit and High Sensitivity 2-Butanone Gas Sensor Based on ZnO Nanosheets Decorated by Co Nanoparticles Derived from ZIF-67

“…2-Butanone is widely used in various industries such as food processing, the coating industry, electronic manufacturing, pharmaceuticals and cosmetics [1][2][3][4]. When the human body is exposed to 2-butanone in the atmosphere, 2-butanone can cause serious negative effects on the human respiratory system, central system and other organs and systems [5][6][7]. At the same time, butanone as a volatile flammable and toxic compound not only damages the environment [8] but also is one of the raw materials for producing "crystal methamphetamine" [9], which may lead to illegal issues such as drug dissemination and can threaten social security and public order.…”

Reduction of heterocyclic carboxaldehydes via Meerwein–Ponndorf–Verley reaction

“…Our research group and the group of Professor Figueras, of the Lyon CNRS (France), have pioneered the use of these solids as catalysts for MPV reactions involving substrates of diverse nature such as naturally occurring aldehydes [12,13], cyclohexanone and its derivatives [14,15] and aromatic aldehydes [16]. This hydrogen transfer process has also been conducted in the presence of other types of catalysts including zeolites [17][18][19] and metal oxides [16,[20][21][22][23][24][25][26][27].…”

“…A wide variety of LDHs containing diverse divalent and trivalent ions in combination with various anions have been reported [28][29][30]. Their calcination at 400-500 8C gives a mixture of oxides that can be used as catalysts or www.elsevier.com/locate/apcata Applied Catalysis A: General 303 (2006) [23][24][25][26][27][28] catalyst supports by virtue of their high specific surface area, purity and structural stability, in addition to their favourable basic properties.…”