Khalid Karim
University of Manchester
14 Papers
268 Citations
Khalid Karim is an academic researcher from University of Manchester. The author has contributed to research in topics: Infrared spectroscopy & Catalysis. The author has an hindex of 8, co-authored 14 publications.
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Papers
FTIR study of weak hydrogen bonding of Broensted hydroxyls in zeolites and aluminophosphates
TL;DR: In this article, a new approach for determination of the distribution of different types of Briinsted hydroxyls is presented, based on a study of weak hydrogen bonding in the model system, which can be transferred to the perturbation caused by oxygens in six-membered rings of @ cages in faujasite-like materials.
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Limitation in the application of pyridine for quantitative studies of brönsted acidity in relatively aluminous zeolites
TL;DR: In this paper, the titration of Bronsted acid sites in H-Y and H-EMT with pyridine, monitored by Fourier transform infrared (FTIR) techniques has demonstrated that the amount of PyH+ ions formed at saturation is the same and does not depend on the Si Al ratio within the range considered, although the HF band (3650 cm−1) is fully perturbed in both cases.
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Synthesis and properties of SAPO-37
TL;DR: In this article, the synthesis of silicoaluminophosphate SAPO-37 which has the faujasite structure type is described, and a direct comparison between SAPO37 and zeolite Y is drawn from Fourier transform infrared spectroscopy of both the frame-work and of sorbed pyridine, and also from oxygen adsorption studies.
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Bimolecular hydrogen transfer over zeolites and SAPOs having the faujasite structure
TL;DR: In this paper, the relative rates of isomerization and bimolecular hydrogen transfer are measured and discussed in terms of active site density for Y zeolites prepared by primary or secondary synthesis and samples of SAPO-37.
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A comparison of siliceous faujasitic zeolites produced by direct synthesis or by secondary synthesis
TL;DR: In this paper, synthetic cubic faujasites (Si/Al = 4) are synthesized hydrothermally and compared with materials of similar framework composition produced by secondary synthesis from zeolite Y using silicon hexafluoride and ZSM-20.
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