Journal Article10.1007/BF00811705
A quantitative description of the active sites in the dehydrated acid catalyst HSAPO-34 for the conversion of methanol to olefins
Luis J. Smith,Anthony K. Cheetham,Leonardo Marchese,John Meurig Thomas,Paul A. Wright,Jiesheng Chen,Enrica Gianotti +6 more
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TL;DR: In this paper, a neutron diffraction study of the deuterated form of a microcrystalline specimen of the H+ SAPO-34 catalyst for converting methanol to light olefins reveals two distinct bridging hydroxyl Bronsted sites.
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Abstract: A neutron diffraction study of the deuterated form of a microcrystalline specimen of the H+ SAPO-34 catalyst for converting methanol to light olefins reveals two distinct bridging hydroxyl Bronsted sites. These sites are also identified by IR spectroscopy which distinguishes their acid strength from the shift in O-H frequencies following adsorption of CO at 77 K. Protons attached to the O(4) bridging oxygen (OH distance 0.95 A) exhibit greater acidity than those attached to O(2) (OH distance 0.91 A).
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Citations
Methanol-to-hydrocarbons: catalytic materials and their behavior
TL;DR: The literature related to methanol-to-hydrocarbons (MTHC) technology over the past two decades has been reviewed, covering mainly the MTO and MTG reactions as mentioned in this paper.
1.4K
Identification and Characterization of Surface Hydroxyl Groups by Infrared Spectroscopy
TL;DR: In this paper, the application of infrared spectroscopy for identification and characterization of surface hydroxyl groups is reviewed, and the properties of OD and OH groups are compared, while the potential of other techniques is also briefly described.
306
Vibrational Spectroscopy of NH4+ Ions in Zeolitic Materials: An IR Study
TL;DR: In this paper, a detailed assignment of the IR vibrational features of NH4+ ions is reported, which reveals that mainly bidentate and tridentate species with various local symmetry are stabilized inside the cages and channels of ZSM-5, MORD, β, SAPO-34, and Y zeolites.
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References
Low-temperature Fourier-transform infrared investigation of the interaction of CO with nanosized ZSM5 and silicalite
Adriano Zecchina,Silvia Bordiga,Giuseppe Spoto,Domenica Scarano,Guido Petrini,Giuseppe Leofanti,M. Padovan,C. Otero Areán +7 more
TL;DR: In this paper, the vibrational spectrum of the OH groups on the external and internal surfaces of H-ZSM5 and Na-Z SM5 samples of different crystallite dimensions has been investigated.
348
On the Nature of Water Bound to a Solid Acid Catalyst
Luis J. Smith,Anthony K. Cheetham,Russell E. Morris,Leonardo Marchese,J. M. Thomas,Paul A. Wright,Jiesheng Chen +6 more
TL;DR: In this paper, the nature of the species formed when water interacts with Bronsted acid sites in a microporous solid acid catalyst, HSAPO-34, was studied by powder neutron diffraction and infrared spectroscopy.
250
Direct determination of proton positions in D-Y and H-Y zeolite samples by neutron powder diffraction
TL;DR: In this paper, high-resolution neutron powder diffraction study of D-Y containing water and completely dehydrated DY and H-Y is reported, and the preferred proton positions near the framework oxygens O(1) and O(3) are confirmed.
218
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.
156
Multinuclear MAS n.m.r. and i.r. spectroscopic study of silicon incorporation into SAPO-5, SAPO-31, and SAPO-34 molecular sieves
TL;DR: In this paper, isomorphous substitution of silicon into the framework of aluminophosphate molecular sieves with different pore sizes was found to be the only direct method to study this type of silicon incorporation.
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