Methylcyclohexane ring-contraction: A sensitive solid acidity and shape selectivity probe reaction.

doi:10.1021/JP040205K

Paper

Methylcyclohexane ring-contraction: A sensitive solid acidity and shape selectivity probe reaction.

Published Feb 17, 2005 · G. Mcvicker, O. C. Feeley, J. J. Ziemiak

The journal of physical chemistry. B

Q1 SJR score

17

Citations

0

Influential Citations

Full textSemantic Scholar

Abstract

In this paper we describe the utility of an acid-catalyzed isomerization reaction, specifically, ring-contraction of methylcyclohexane to an isomeric mixture of alkylcyclopentanes as a tool for characterizing the acidic properties of a wide range of platinum-loaded solid acids. Methylcyclohexane isomerization is particularly useful as a solid acidity probe reaction since it is a simple molecule containing one six-membered ring and a single methyl group substituent. As a solid acidity probe molecule methylcyclohexane has a number of advantages over cyclohexane. Ring-contraction of cyclohexane produces a single product, methlycyclopentane. Methylcyclohexane ring-contraction, in contrast, yields a richer and thus more informative product mixture including ethylcyclopentane, and five isomeric dimethylcyclopentanes. For the first time it will be shown that variations in the three primary descriptors of solid acids, acid site density, acid site strength, and shape selectivity, within a wide range of amorphous and crystalline solid acids can be simultaneously ranked using a single component probe reaction, namely, methylcyclohexane ring-contraction.

Study Snapshot

Methylcyclohexane ring-contraction is a sensitive and informative tool for analyzing the acidic properties of various platinum-loaded solid acids, providing insights into acid site density, strength, and shape selectivity.

PopulationOlder adults (50-71 years)

Sample size24

MethodsObservational

OutcomesBody Mass Index projections

ResultsSocial networks mitigate obesity in older groups.

Sign up to use Study Snapshot

Consensus is limited without an account. Create an account or sign in to get more searches and use the Study Snapshot.

Create an account

Paper

Methylcyclohexane ring-contraction: A sensitive solid acidity and shape selectivity probe reaction.

Sign up to use Study Snapshot

References

Citations

Confinement effects of mandrel degradation in ICF target fabrication.

Confinement can decrease or increase the energy barriers of poly--methylstyrene degradation, allowing the density of PAMS to regulate mandrel degradation in inertial confinement fusion target fabrication.

Location of the Active Sites for Ethylcyclohexane Hydroisomerization by Ring Contraction and Expansion in the EUO Zeolitic Framework

The most active sites for 1-ethylcyclohexene isomerization in the EUO zeolite framework are at the intersection between channels and pockets, with 12 MR pockets and 10 MR channel sites being more effective than the intersection between channels and pockets.

Highly selective molybdenum-based catalysts for ring hydrogenation and contraction

MoO3 catalysts show potential for efficient aromatic ring hydrogenation and contraction, with potential for further optimization and shorter induction periods.

Single-phase mixed molybdenum-niobium carbides: Synthesis, characterization and multifunctional catalytic behavior in toluene conversion

Single-phase mixed molybdenum-niobium carbides show promising multifunctional catalytic behavior in toluene conversion, with increased molybdenum content enhancing CO uptake and methylcyclohexane turnover frequencies.

Acid strength and metal-acid proximity effects on methylcyclohexane ring contraction turnover rates and selectivities

Acid strength and metal-acid site proximity significantly impact methylcyclohexane ring contraction turnover rates and selectivities, but isomer selectivities cannot be used to infer the strength of acid sites.

Heat-Sink Enhancement of Supercritical Methylcyclohexane Cracking over Lanthanum-Modified Beta Zeolite

Lanthanum-modified beta zeolite catalysts can enhance heat-sink performance and gas yield in supercritical methylcyclohexane cracking, with better coking inhibition performance compared to pure beta zeolite and thermal cracking.

Insights into the Major Reaction Pathways of Vapor‐Phase Hydrodeoxygenation of m‐Cresol on a Pt/HBeta Catalyst

Higher temperatures lead to the dominant direct deoxygenation to toluene pathway on a Pt/HBeta catalyst, while the initial hydrogenation of m-cresol is less dominant due to inhibition of initial hydrogenation.

The Acidity of Zeolites: Concepts, Measurements and Relation to Catalysis: A Review on Experimental and Theoretical Methods for the Study of Zeolite Acidity

Zeolites' acidity can be characterized using various physical techniques, which can influence their catalytic activity in acid-catalyzed reactions.

Ring opening of decalin and methylcyclohexane over bifunctional Ir/WO3/Al2O3 catalysts

Bifunctional Ir/WO3/Al2O3 catalysts show potential for improving cetane number in ring-opening reactions of decalin and methylcyclohexane, with ring contraction preceding ring opening.