Basic zeolites as catalysts in the N-alkylation of imidazole: Activation by microwave irradiation

Costarrosa, Laureano; Ruiz‐Martínez, Javier; Rios, Rachel V. R. A.; Silvestre-Albero, Joaquín; Cervantes, María Luisa Rojas; Sepúlveda-Escribano, A.

doi:10.1016/j.micromeso.2008.07.046

Cited by 5 publications

(6 citation statements)

References 30 publications

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“…The heat of immersion depends on the surface area available to the liquid, the porosity of the solid, and the specific interaction of the liquid molecules with the solid surface. In practice, this means that by using a wide variety of liquids, immersion calorimetry can be applied for the assessment of the pore size distribution, acidity, basicity, and surface polarity of a solid material. ,− However, reports in which catalytic testing is combined with immersion calorimetry are very scarce . Moreover, to the best of our knowledge, there is no literature available that explicitly combines the catalytic conversion of a specific molecule with immersion calorimetry of the same molecule.…”

Section: Introductionmentioning

confidence: 99%

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Immersion Calorimetry as a Tool To Evaluate the Catalytic Performance of Titanosilicate Materials in the Epoxidation of Cyclohexene

et al. 2011

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Different types of titanosilicates are synthesized, structurally characterized, and subsequently catalytically tested in the liquid-phase epoxidation of cyclohexene. The performance of three types of combined zeolitic/mesoporous materials is compared with that of widely studied Ti-grafted-MCM-41 molecular sieve and the TS-1 microporous titanosilicate. The catalytic test results are correlated with the structural characteristics of the different catalysts. Moreover, for the first time, immersion calorimetry with the same substrate molecule as in the catalytic test reaction is applied as an extra means to interpret the catalytic results. A good correlation between catalytic performance and immersion calorimetry results is found. This work points out that the combination of catalytic testing and immersion calorimetry can lead to important insights into the influence of the materials structural characteristics on catalysis. Moreover, the potential of using immersion calorimetry as a screening tool for catalysts in epoxidation reactions is shown.

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Section: Introductionmentioning

confidence: 99%

“…19,[21][22][23][24][25] However, reports in which catalytic testing is combined with immersion calorimetry are very scarce. 26 Moreover, to the best of our knowledge, there is no literature available that explicitly combines the catalytic conversion of a specific molecule with immersion calorimetry of the same molecule.…”

Section: Introductionmentioning

confidence: 99%

Immersion Calorimetry as a Tool To Evaluate the Catalytic Performance of Titanosilicate Materials in the Epoxidation of Cyclohexene

et al. 2011

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“…Solid strong bases are extremely desirable for application in environmentally benign and economical chemical processes, since they can catalyze diverse reactions under mild conditions and minimize waste production. – So far various materials have been attempted as hosts for the preparation of solid bases. Due to their ordered microporous structure, zeolites can recognize, discriminate, and organize molecules precisely. , Considerable attention has been paid to the synthesis of basic materials derived from zeolites. – Nevertheless, the application of zeolites is limited by slow diffusion of substrates into their micropores for bulky molecular reactions and rapid deactivation owing to coke formation …”

Section: Introductionmentioning

confidence: 99%

Magnesia-Incorporated Mesoporous Alumina with Crystalline Frameworks: A Solid Strong Base Derived from Direct Synthesis

2009

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By use of a surfactant templating method, the direct synthesis of magnesia-incorporated mesoporous alumina (mMgAl-γ) was realized via self-assembly of inexpensive inorganic salts. The structural and basic properties of the obtained materials were well characterized by various approaches. The results show that mMgAl-γ samples possess strong basicity with excellent water-resistant ability, well-defined mesoporous structure, and γ-Al2O3 crystalline frameworks. In comparison with wet impregnation that leads to structural damage, the direct synthesis strategy allows the mesoporous alumina to maintain good mesostructure. For example, the Brunauer−Emmett−Teller surface area of sample mMgAl(0.1)-γ can reach 328 m2·g−1, which is obviously higher than that of the sample prepared by a conventional impregnation method (239 m2·g−1). Further investigations evidence that the fabrication of suitable preassembled mesoporous precursors is crucial for the efficiency of the present direct synthesis strategy. In the process of calcination, the strongly basic species MgO was produced simultaneously and in situ coated on newly formed mesoporous γ-Al2O3 from preassembled precursors. Besides mMgAl-γ, mesoporous γ-Al2O3 materials functionalized with iron, chromium, and lead oxides were also successfully prepared, which demonstrates the generality of the strategy.

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“…The alkylation of heterocycles is an important synthetic step for the preparation of biological active compounds such as fungicides and anticonvulsants. Costarrosa and coauthors reported on an alkylation reaction performed on imidazole by using different alkylating agents, alkaline-exchanged X-type zeolite as catalyst, and microwave irradiation to promote the chemical process [41].…”

Section: Microwave Irradiation Promotes the N-alkylation Of Imidazolementioning

confidence: 99%

Zeolites as Acid/Basic Solid Catalysts: Recent Synthetic Developments

2019

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The zeolites are porous solid structures characterized by a particular framework of aluminosilicates, in which the incorporation of the Al+3 ions generates an excess of negative charge compensated by cations (usually alkali or alkali earth) or protons. In the latter case, they are employed as catalysts for a wide variety of reactions, such as dehydration, skeletal isomerization and cracking, while the catalytic activity of basic zeolites has not found, up to now, any industrial or whatever relevant application in chemical processes. In the present review, we firstly intend to give an overview of the fundamental chemical composition, as well as the structural features of the zeolite framework. The purpose of this paper is to analyze their key properties as acid, both Lewis and Brønsted, and basic solid support. Their application as catalysts is discussed by reviewing the already published works in that field, and a final remark of their still unexplored potential as green, mild, and selective catalyst is also reported.

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Basic zeolites as catalysts in the N-alkylation of imidazole: Activation by microwave irradiation

Cited by 5 publications

References 30 publications

Immersion Calorimetry as a Tool To Evaluate the Catalytic Performance of Titanosilicate Materials in the Epoxidation of Cyclohexene

Immersion Calorimetry as a Tool To Evaluate the Catalytic Performance of Titanosilicate Materials in the Epoxidation of Cyclohexene

Magnesia-Incorporated Mesoporous Alumina with Crystalline Frameworks: A Solid Strong Base Derived from Direct Synthesis

Zeolites as Acid/Basic Solid Catalysts: Recent Synthetic Developments

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