Multiple adsorption process description of zeolite mordenite acidity

Macedo, Julio L. de; Dias, Sílvia C.L.; Dias, José A.

doi:10.1016/j.micromeso.2004.04.009

Cited by 23 publications

(11 citation statements)

References 35 publications

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“…More details of the Cal-Ad method have been published elsewhere [14]. The Cal-Ad method has been applied together with spectroscopic studies to analyze the acidity of different heteropolyacids, including H 3 PW [24], Cs x H 3Àx PW [25], H 3 PW/SiO 2 [10], and H 3 PW/Al 2 O 3 [14], as well as different solid acids, such as zeolites [26][27][28][29].…”

Section: Characterization Of the Materialsmentioning

confidence: 99%

Preparation and characterization of H3PW12O40 supported on niobia

Caliman

Dias

et al. 2010

Microporous and Mesoporous Materials

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Section: Characterization Of the Materialsmentioning

confidence: 99%

Preparation and characterization of H3PW12O40 supported on niobia

Caliman

Dias

et al. 2010

Microporous and Mesoporous Materials

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“…4). The activity of zeolites can be correlated with the total amount of accessible Brønsted acid sites [4,29]. In addition, among zeolites, Beta zeolite is known as a material which exhibits a very high accessible surface area and a high external surface.…”

Section: Catalytic Testsmentioning

confidence: 99%

Heterogeneous Catalytic Transformation of Citronellal to Menthol in a Single Step on Ir-Beta Zeolite Catalysts

et al. 2009

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The synthesis of menthol from citronellal was studied on bifunctional Ir/Beta zeolite catalysts, prepared via impregnation of Beta zeolite with different concentrations of Ir. The results show that Beta zeolites, impregnated with Ir, catalyze the one-pot full conversion of citronellal to menthol by consecutive acid-catalyzed cyclization and Ir-catalyzed hydrogenation. The best results (95% selectivity for the menthol isomers, of which 75% is the desired (±)-menthol) were recorded on 3% Ir/Beta zeolite catalyst. In contrast with earlier studies, 0.05 g Ir/Beta catalyst per mL of substrate leads to complete and selective substrate transformation. The textural properties, acidity and hydrogenation function were studied by liquid N 2 adsorption-desorption, FT-IR, XPS and hydrogen chemisorption techniques. To clarify the mechanism of the cyclization of citronellal, tests were also performed using zeolites with different acidity and loaded with other metals (Pt, Pd, Rh, Ru).

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“…In addition, other solids such as silica gel [26], mordenite [27], Y zeolite [28], ZSM-5 [29], TS-1 [30], sulfated zirconia [31], etc., are among the variety of important solid acids characterized by this method.…”

Section: Calorimetric and Adsorption Titrationsmentioning

confidence: 99%