FTIR spectroscopic studies of zeolites

by K. M. Al-Ghefaili

Publisher: UMIST in Manchester

Written in English
Published: Downloads: 484
Share This

Edition Notes

StatementK.M. Al-Ghefaili ; supervised by J. Dwyer.
ContributionsDwyer, J., Chemistry.
ID Numbers
Open LibraryOL17330918M

The present paper shows a direct comparison of IR spectra of adsorbed NO on two catalyst systems (Fe-silicalite and Fe-ZSM-5), recorded in a flow-through cell (in operando, where NO is carried by an excess of inert gas) and static cell (in situ, where a given pure NO equilibrium pressure is dosed).Cited by: The original properties of mesoporous molecular sieves are so unique that the design of most existing catalysts could be reconsidered. It might indeed be of interest to introduce MMS either as a support or as the active phase, merely on the basis of their high surface areas, narrow pore size distribution and flexibility in composition. The recent literature provides examples of MMS . Modeling Basic Zeolites K. D. Hammond and S. M. Auerbach 1 Modeling the Structure and Spectroscopy of Alkaline Zeolites Karl D. Hammond1 and Scott M. Auerbach1,2,1 1Department of Chemical Engineering and 2Department of Chemistry University of Massachusetts Amherst, Amherst, MA 1 Integration of iron in natural and synthetic Al-pyrophyllites: an infrared spectroscopic study. Sébastien Lantenois 1,2 * Jean-Michel Bény1 Fabrice Muller1 Rémi Champallier1 1 Institut des Sciences de la Terre d’Orléans (ISTO), CNRS – Université d’Orléans, 1A rue de la Férollerie, Orléans Cedex 2, France.

Because the pore size in MFI zeolites is known to be around nm, this demonstrates that BF-STEM is an effective tool for observing pores in such zeolites. Although smaller pores with sizes of around nm would be more difficult to observe due to the resolution limit, BF-STEM allows observations of a variety of zeolites with pore sizes of. This study is aimed at investigating the structural and morphological characterization of natural and modified zeolite obtained from the state of Oaxaca (Mexico). Iron nanoparticles were used for the zeolite modification. The iron nanoparticles were loaded on the zeolite surface by homogeneous nucleation. Adsorption kinetic models of pseudo first and second order were Cited by: 5. According to the UV/VIS and FTIR studies of Rhodamine 6G (Rh6G) sorption, LTPMZ displayed higher affinity to the cationic dye. This study demonstrates that low-temperature plasma treatments could be used to activate zeolite for environmental by: 1. The FTIR spectra of these zeolites in framework vibration region also shows sharp feature for zeolites in the cm High crystalline nature of the material is reveals by the absorption bands at cm The synthesized zeolites were used for the sorption studies for malathion, Pd(II), Ru(III) and plant nutrient by: 4.

A common problem with zeolite catalysts used in hydrocarbon conversion is deactivation by coke deposition. Using UV Raman spectroscopy, coke formation and oxidation in ZSM-5 Cited by: definitive spectroscopic evidence indicating substitution of oxygen for nitrogen in the zeolite framework. We therefore need to compare our calculated values to an experimental spectrum. We accomplish this by assuming each type of silicon nucleus from Table 1 generates a Lorentzian NMR line shape, with a weighting based on the presumed. subsequently published in Zeolites, 18, , February - March DOI#/ S(96) This Article is brought to you for free and open access by the Physics Department at [email protected] It has been accepted for inclusion in Physics Faculty Publications by an authorized administrator of [email protected] by: Zeolites and related microporous materials are a class ofmaterials with an ever widening range ofcompositions,structures and the earliest days of zeolite science X-ray diffraction has been one ofthe basic and most useful tools for characterization. Initially X-ray diffraction was used to answer simple questions such as:“have.

FTIR spectroscopic studies of zeolites by K. M. Al-Ghefaili Download PDF EPUB FB2

Single and Dual Cation Sites in Zeolites: Theoretical Calculations and FTIR Spectroscopic Studies on CO Adsorption on K-FER. The Journal of Physical Chemistry B(45), DOI: /jp Mehmet Ferdi by: This work presents the results of FTIR spectroscopic studies (MIR) of heavy metal cations (Pb2+, Cd2+, Ag+ and Cr3+) immobilization from aqueous.

In the present work we show the results of thermal and FTIR studies of a natural zeolite exchanged with monovalent (Na +, K + and NH 4 +) and bivalent (Pb 2+, Cd 2+ and Zn 2+) l analysis data for the zeolite samples were obtained by TG/DTG and DSC, and were employed to evaluate the desorption behaviour of by: Thermal and spectroscopic studies of zeolites exchanged with metal cations Article in Journal of Molecular Structure (s 1–3)– January with 41 Reads How we measure 'reads'.

The dehydration processes of naturally occurring zeolites (including stilbite and mesolite) were investigated by in situ FTIR spectroscopy (– cm −1) by Prasad et al.

and Prasad and Prasad, who reported the IR absorbance spectra of dehydrated natural zeolites. The Significance of This WorkCited by: Raman spectroscopic studies of the synthesis of faujasitic zeolites: Comparison of two silica sources Jen Twu and Prabir K.

Dutta Department of Chemistry, The Ohio State University, Columbus, OHUSA Charles T. Kresge Mobil Research and Development Corporation, Paulrboro Research Laboratory, Paulsboro, NJUSA In this study, we have examined Cited by:   FTIR spectra of CO adsorbed on Pt/KL catalysts show that the relative band intensities and the total dispersion markedly depend on the catalyst preparation method (ion exchange, incipient wetness impregnation or co-impregnation with KCl).

The CO stretching frequency of the dominant band for linear CO is shifted to higher wavenumbers, parallel with Cited by: Interaction of CO with K-FER zeolite was investigated by a combination of variable-temperature IR spectroscopy and computational study.

Calculations were performed using ωCO/rCO correlation method in combination with a periodic density functional theory model. On the basis of agreement between experimental and calculated results, the following carbonyl complexes Cited by: Department of Studies in Geology, University of Mysore ManasagangotriMysore, India E-mail: [email protected] Various infrared bands assigned to microporous molecu-lar sieve zeolites is described.

Key Words: Zeolite, Infrared spectra. The mid-infrared spectra have been considered for the zeolites by: zeolites, we used SEM-EDX graphics as well as FTIR; this method had been used before by other scientists 7.

The applications of vibrational spectroscopic techniques for investigating different environmental problems have grown significantly in the last years 1 Cited by:   FTIR spectroscopic and computational studies on hydrogen adsorption on the zeolite Li-FER.

Nachtigall P(1), Garrone E, Palomino GT, Delgado MR, Nachtigallová D, Areán CO. Author information: (1)Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic and Centre for Biomolecules and Complex Molecular Systems Cited by: When adsorbed (at a low temperature) on alkali-metal-exchanged zeolites, CO forms both M(CO)+ and M(OC)+ carbonyl species with the extra-framework alkali-metal cation of the zeolite.

Both quantum chemical and experimental results show that C-bondend adducts are characterized by a C−O stretching IR band at a frequency higher than that of cm-1 for free CO, while Cited by: FTIR study of carbon monoxide adsorption on ion-exchanged X, Y and mordenite type zeolites* V.

RAKI] was found to be dependent on the Si/Al ratio of the investigated zeolites. Keywords: FTIR, zeolites, carbon monoxide. Infrared spectroscopic studies. From the results of the FTIR and 1 H MAS NMR studies it can be concluded that the chemical composition of the lattice dominates the acidic strength of the Brønsted sites in zeolites.

Differences in structure or pore size play a much smaller by: zeolites. These acidic sites can be detected by IR spectroscopic examination of adsorbed moleculesz3. It is important to know the structure, concentration, strength and accessibility of the Br6nsted and Lewis acid sites and the details of their interaction with the adsorbed molecules in order to study the catalytic activity of zeolites.

Spectroscopic studies of the proton-ammonia interaction in zeolite Y Citation for published version (APA): Jacobs, W. Spectroscopic studies of the proton-ammonia interaction in zeolite Y.

Eindhoven:Author: W.P.J.H. Jacobs. Few spectroscopic studies of boron interactions with soil components have been attempted. Beyrouty et al. () used transmission mode FTIR spectroscopy to investigate the effect that boric acid adsorption had on the crystallization of an.

Phys. Chem.93, Infrared Transmission Spectroscopy of Silver Zeolite A J. Baumann,+ R. Beer, G. Calzaferri,* and B. Waldeck Institute for Inorganic and Physical Chemistry, University of Berne, CH Bern 9, Switzerland (Received: May 6, In Final Form: Septem ) A high-vacuum cell attached to the external part of a BOMEM.

films. A powerful technique for studies of phenomena at surfaces or in thin films is FTIR/ATR-spectroscopy (Fourier Transform Infra Red / Attenuated Total Reflection). In this work, MFI zeolite films were prepared on ATR elements using two methods. One method produced nm thick films with small crystals.

FTIR spectroscopic, thermal and growth morphological studies of calcium hydrogen phosphate dihydrate crystals. Authors. Vimal S. Joshi, Department of Physics, Saurashtra University, Rajkot –India; Search for more papers by this author.

Mihir J. Joshi. FTIR Study of the Relation, between Extra-framework Aluminum Species and the Adsorbed Molecular Water, and its Effect on the Acidity in ZSM-5 Steamed Zeolite intensities in the region of to cm–1. These bands are grouped in two types of vibrations of the tetrahedral TO 4 units (where T = Al or Si).

@article{osti_, title = {Synthesis and spectroscopic studies of vanadium-containing molecular sieves}, author = {Sayari, A. and Moudrakovski, I. and Reddy, K.M.}, abstractNote = {New vanadium containing large pore and mesoporous molecular sieves with ZSM and MCM structures were synthesized and characterized by variety of chemico-physical methods.

Background. Zeolite is a collective name for minerals and chemical compounds within the group of silicates. Natural zeolites are crystalline compounds of volcanic origin with microporous structures of Si- and AI-tetrahedrons (SiO 4, AIO 4), linked through the common oxygen atoms to form an open crystal structure [].The arrangement of the atoms affects the Cited by: Recent Advances in Science and Technology of Zeolites and Related Materials is a collection of oral and poster communications, presented during the 14th International Zeolite Conference (IZC).

The conference was hosted by the Catalysis Society of South Africa. In the tradition of the IZC series, this Conference provides a forum for the presentation of new knowledge in the 5/5(1). Catalysis plays an important role in sustainable chemistry, enabling the development of more efficient processes by minimizing the consumption of energy and reducing the generation of by-products.

The design of efficient catalysts is a key point in this respect, where spectroscopy confers fundamental knowledge at the molecular scale. Among the different spectroscopies, Author: Patricia Concepcion.

Infrared spectroscopic studies ofsmec- rites having variable octahedral site compositions have shown related shifts in the spectral features at /~m (~ cm -1) and gm ( 1) due to. Bishop, Pieters, and Edwards Clays and Clay Minerals structural OH species.

Abstract. A fast and accurate method for identification and determination of purity of Zeolite Socony Mobil 5 (ZSM-5) zeolite was developed using the IR optical density ratio of the bands at and cm −1 in the mid-IR region of the structure spectra. The optical density values obtained from the proposed method, for ZSM-5 zeolite synthesized, are compared with those.

FTIR spectroscopic study of pyridine adsorption at Ts = °C (where Ts is the temperature from which there is no overlap between the signals of the physisorbed and chemisorbed pyrid48‑50) shows changes in the intensity of the bands between and cm –1 with the increase of the temperature of the hydrothermal treatment.

Abstract. A stable site-isolated mononuclear platinum catalyst with a well-defined structure is presented. Platinum complexes supported in zeolite KLTL were synthesized from [Pt(NH 3) 4](NO 3) 2, oxidized at K, and used to catalyze CO y, IR and X-ray absorption spectra and electron micrographs determine the structures and locations of the platinum.

In this chapter, studies of structures and optical properties of Ag-zeolite A by means of X-ray absorption fine structure (XAFS) and infrared (IR) spectra are presented. XAFS is a powerful tool to study the local structure of Ag nanoclusters in the zeolite cavity and IR spectra are quite sensitive to the change in zeolite lattice affected by the production of Ag : Takafumi Miyanaga, Yushi Suzuki, Sho Narita.

T1 - Ultraviolet Raman spectroscopy characterization of coke formation in zeolites. AU - Li, Can. AU - Stair, Peter. PY - /1/ Y1 - /1/ N2 - Ultraviolet (UV) Raman spectroscopy has been used to characterize coke formation in ZSM-5 and USY zeolites under propene at temperatures from K to by: Infrared spectroscopy is known to be a useful tool for identifying local structure changes in zeolites.

Infrared spectroscopy is often employed to complement X-ray diffraction data. Local structure changes in zeolite CIT-6 and its zeolite beta (*BEA) analogs caused by calcination, altering framework composition, and ion exchange have been identified with mid- and far Cited by: 1.Research Article Infrared Spectroscopic Characterization of CIT-6 and a Family of BEA Zeolites son, 1 TylerMcGown, 21 y 1 Department of Chemical Engineering, Kansas State University, Durland Hall, Manhattan, KS - USA Burns & McDonnell, Ward Parkway, Kansas City, MO, USA.