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Aramendía, M. A.; Boráu, V.; Jiménez, Carlos; Marinas, Alberto; Marinas, J. M.; Porras, A.; Urbano, Francisco J.

doi:10.1023/a:1019091707976

Cited by 165 publications

(267 citation statements)

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“…Bezouhanova and Al-Zihari [22] recommended the dehydration activity of CHOL conversion as a simple test to measure the Br nsted acid sites in a metal oxide. The same opinion was also expressed by Martin and Duprez [24] and Armendia et al [33]. A similar comparison can be made (Table 4) between the surface basicities determined earlier by adsorption of electron acceptors and the present basicity parameter, namely, k CHONE /k CHENE .…”

Section: Discussionsupporting

confidence: 81%

“…According to Armendia et al [33], the widely documented correlation found for alcohol dehydration is not so clear for alcohol dehydrogenation. Gervasini and Auroux attempted to correlate the dehydration and dehydrogenation activities of isopropanol decomposition [37] with the acid-base character obtained by the calorimetric investigation [38] of a large series of metal oxides.…”

Section: Discussionmentioning

confidence: 99%

“…So we come to the conclusion that the weak to medium acid sites of the ferrite samples are more decisive in controlling the dehydration activities. Armendia et al [33], during their investigation of different organic test reactions over acid-base catalysts, found that alcohol dehydration activity was appreciably correlated to Br nsted acidity and concluded that weak to medium acid sites were responsible for dehydration.…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Study of cyclohexanol decomposition reaction over the ferrospinels, A1−xCuxFe2O4 (A=Ni or Co and x=0, 0.3, 0.5, 0.7 and 1), prepared by ‘soft’ chemical methods

Ramankutty

Sugunan

Thomas

2002

Journal of Molecular Catalysis A: Chemical

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Section: Discussionsupporting

confidence: 81%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Study of cyclohexanol decomposition reaction over the ferrospinels, A1−xCuxFe2O4 (A=Ni or Co and x=0, 0.3, 0.5, 0.7 and 1), prepared by ‘soft’ chemical methods

Ramankutty

Sugunan

Thomas

2002

Journal of Molecular Catalysis A: Chemical

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“…Surface acidity of the supported catalysts was also evaluated by studying the decomposition reactions of isopropanol (48)(49)(50)(51). Catalytic tests were carried out in a glass microreactor working at atmospheric pressure with 0.2 g of catalyst.…”

Section: Methodsmentioning

confidence: 99%

Tungsten catalysts supported on activated carbonI. Preparation and characterization after their heat treatments in inert atmosphere

Álvarez-Merino¹,

Carrasco-Marín²,

Fierro³

et al. 2000

Journal of Catalysis

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Tungsten catalysts supported on activated carbon, and with different metal content, were prepared from both ammonium tungstate and tungsten hexacarbonyl precursors. The catalysts were subjected to heat treatments, in He flow, between 623 and 1223 K for 4 h and characterized to determine their surface area and pore texture, the chemical state and dispersion of the metallic phase, and the total surface acidity. For this purpose, different techniques were used such as adsorption of N 2 at 77 K and mercury porosimetry; X-ray diffraction and X-ray photoelectron spectroscopy; temperatureprogrammed desorption of previously adsorbed NH 3 ; and behavior in the decomposition reactions of isopropanol. Results show that in the case of the catalysts prepared from ammonium tungstate an increase in the treatment temperature between 623 and 1223 K leads to a drop in the O/W ratio to below 3, resulting in the appearance of nonstoichiometric oxides such as W 25 O 73 , W 20 O 58 , and W 18 O 49 . At 1223 K, a mixture of W, tungsten carbides, and tungsten trioxide was detected. The catalysts prepared from tungsten hexacarbonyl presented a higher dispersion and no X-ray diffraction peaks. Total surface acidity, as measured by ammonia desorption, decreased with increasing treatment temperature, and the study of the decomposition reactions of isopropanol showed that the catalysts were essentially of acid character, with a much higher selectivity (or rate) to propene than to acetone. Moreover, there was a linear relationship between the reaction rate to propene and the amount of NH 3 desorbed from the catalysts, irrespective the method of preparation and treatment temperature.

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“…What is also very important is that it does not require any special equipment due to the lack of hydrogen gas and operation under atmospheric pressure. Metal oxides, such as MgO [3][4][5][6], Al 2 O 3 [7], ZrO 2 ÁnH 2 O [8][9][10], as well as mixtures of two or three metal oxides [11][12][13][14], magnesium phosphates [15] and zeolites [16][17][18] have been used as catalysts. Recently, the catalysts obtained from hydrotalcites have also been used in CTH [12,[19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Catalytic hydrogen transfer over magnesia. Part XXV. Liquid and vapor phase reduction of ketoesters

Gliński

Czajka

Ulkowska

2014

Reac Kinet Mech Cat

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The reactivity of two series of compounds: alkyl x-oxoalkanoates (x = 2, 3, 4 and 6), and alkyl x-phenyl-y-oxoalkanoates (y = 2 and 4) has been studied in the catalytic transfer hydrogenation (CTH) over magnesium oxide as the catalyst. The catalytic tests have been performed either in liquid or vapor phase with secondary alcohols (2-propanol to 2-octanol) as hydrogen donors. A strong diminution of reactivity of the ketoesters in CTH has been observed, in contrast to simple aliphatic or aralkyl ketones. The occurrence of transalcoholysis between ketoesters and alcohols used as hydrogen donors resulted in the formation of new ketoesters as side products. The hydroxoesters, i.e. the products of the CTH reaction, have been obtained with only moderate to good yields (up to 50 %). It has been found that in the CTH of ketoesters with the carbonyl group in a c position, such as alkyl levulinates and benzoylpropionates, the appropriate lactones (c-valerolactone and 5-phenyl-c-valerolactone) have been formed.

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Cited by 165 publications

References 0 publications

Study of cyclohexanol decomposition reaction over the ferrospinels, A1−xCuxFe2O4 (A=Ni or Co and x=0, 0.3, 0.5, 0.7 and 1), prepared by ‘soft’ chemical methods

Study of cyclohexanol decomposition reaction over the ferrospinels, A1−xCuxFe2O4 (A=Ni or Co and x=0, 0.3, 0.5, 0.7 and 1), prepared by ‘soft’ chemical methods

Tungsten catalysts supported on activated carbonI. Preparation and characterization after their heat treatments in inert atmosphere

Catalytic hydrogen transfer over magnesia. Part XXV. Liquid and vapor phase reduction of ketoesters

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