Adsorption of pyrrole derivatives in alkali metal cation-exchanged faujasites: comparative studies by surface vibrational techniques, X-ray diffraction and temperature-programmed desorption augmented with theoretical studies Part I. Pyrrole as probe molecule

Döbler, Jens; Förster, H.; Fueß, H.; Geidel, Ekkehard; Hunger, B.; Kirschhock, Christine; Klepel, Olaf; Poschnar, Eike

doi:10.1039/a807296e

Cited by 49 publications

(38 citation statements)

References 32 publications

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“…A sharp peak was observed at 3478 cm -1 which can be assigned to perturbed N-H stretch of pyrrole molecules interacting with the basic sites of the framework oxygen atoms. The H-donor properties of pyrrole allowed the formation of C4H4NH-O bridges with basic oxygen [25,26]. It is noteworthy that FmZSM-5 showed greatly enhanced basic sites with respect to RmZSM-5.…”

Section: Physical Properties Of the Catalystsmentioning

confidence: 97%

Fibrous silica mesoporous ZSM-5 for carbon monoxide methanation

Teh

Triwahyono

Jalil

et al. 2016

Applied Catalysis A: General

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Section: Physical Properties Of the Catalystsmentioning

confidence: 97%

Fibrous silica mesoporous ZSM-5 for carbon monoxide methanation

Teh

Triwahyono

Jalil

et al. 2016

Applied Catalysis A: General

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“…Moreover, in the event that some potassium cations exchanged with the Na cations, the basicity can be enhanced according to the difference in cationic size. 7,13,14 Because the peak positions in all samples were not clearly resolved, deconvolutions of the TPD profiles were generated ( Figure 1). There were three peaks for NaY and four peaks for the K/NaY samples.…”

Section: Pyrrole-tpdmentioning

confidence: 99%

“…7 Pyrrole can be used as a probe molecule in TPD for the characterization of basic sites because it can be adsorbed reversibly due to its weak acidity. 3,7 In the present work, we applied pyrrole-TPD to study the basicity of NaY and K/NaY. Furthermore, the basic properties of the K/NaY catalysts were correlated with the catalytic activity on transformation of 2-methyl-3-butyn-2-ol (MBOH).…”

Section: Introductionmentioning

confidence: 99%

“…2 Consequently, pyrrole (C 4 H 4 NH), a five-membered ring heterocyclic aromatic compound may be used as an alternative probe molecule to characterize zeolite basicity. 2,6,7 Pyrrole is an amphoteric molecule which can either interact with the Lewis basic oxygen of zeolite via the NH group by hydrogen bonding or with the Lewis acidic cation via the aromatic π-electrons interaction. 7 Pyrrole can be used as a probe molecule in TPD for the characterization of basic sites because it can be adsorbed reversibly due to its weak acidity.…”

Section: Introductionmentioning

confidence: 99%

“…2,6,7 Pyrrole is an amphoteric molecule which can either interact with the Lewis basic oxygen of zeolite via the NH group by hydrogen bonding or with the Lewis acidic cation via the aromatic π-electrons interaction. 7 Pyrrole can be used as a probe molecule in TPD for the characterization of basic sites because it can be adsorbed reversibly due to its weak acidity. 3,7 In the present work, we applied pyrrole-TPD to study the basicity of NaY and K/NaY.…”

Section: Introductionmentioning

confidence: 99%

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Basic properties of potassium oxide supported on zeolite y studied by pyrrole-tpd and catalytic conversion of methylbutynol

2012

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Recebido em 14/10/11; aceito em 16/5/12; publicado na web em 24/8/12We report on the basic properties of zeolite NaY and potassium supported on NaY (K/NaY) assessed by pyrrole-TPD and MBOH transformation. Pyrrole-TPD revealed that impregnation of zeolite NaY with potassium promoted additional adsorption sites for pyrrole compared to parent zeolite. For zeolite with various potassium loadings, pyrrole adsorbed on K/NaY decreased with increased potassium loading. Reduction in pyrrole adsorption could be due to potassium hindering intrinsic basic sites (lattice oxygen), to oxide of potassium occluding in zeolite cavities restricting access for pyrrole, or to K 2 O reacting with pyrrole to form nondesorbed pyrrolate anions. On MBOH transformation, potassium almost completely suppressed NaY acid sites while K/NaY basicity increased with potassium loading.

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Neutron Scattering

Jobic

2008

Handbook of Heterogeneous Catalysis

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Introduction Neutron scattering is a uniquely sensitive probe for studying the structure and dynamics of materials on the atomic and molecular level. Neutron-based techniques cover an extremely wide range of applications, extending from nuclear physics to biology. Several of these techniques have been applied in catalysis research. The structure of hydrogenous layers and of molecules adsorbed in zeolites has been determined by neutron diffraction. Textural or clustering studies have been performed by small-angle neutron scattering (SANS). The vibrational modes of catalysts and of adsorbed molecules have been measured by inelastic neutron scattering (INS). The rotational and translational motions of molecules have been characterized by quasielastic scattering (QENS). Other neutron techniques such as reflection and magnetic scattering have not been used so far in catalysis. Interaction of Neutrons with MatterNeutrons interact with nuclei via very short-range nuclear forces. A neutron has both particle-like and wave-like properties: it has zero charge, spin 1/2, a mass slightly larger than that of a proton and a wavelength λ.The potential interest in neutrons, in contrast with other probes, lies in the fact that its wavelength matches interatomic distances and that its energy covers a wide References see page 981

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Adsorption of pyrrole derivatives in alkali metal cation-exchanged faujasites: comparative studies by surface vibrational techniques, X-ray diffraction and temperature-programmed desorption augmented with theoretical studies Part I. Pyrrole as probe molecule

Cited by 49 publications

References 32 publications

Fibrous silica mesoporous ZSM-5 for carbon monoxide methanation

Fibrous silica mesoporous ZSM-5 for carbon monoxide methanation

Basic properties of potassium oxide supported on zeolite y studied by pyrrole-tpd and catalytic conversion of methylbutynol

Neutron Scattering

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