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Title: H-D Exchange of Simple Aromatics as a Measure of Brønsted-Acid Site Strengths in Solids

Abstract

The relative Brønsted-acid strengths of H-[Al]ZSM-5, H-[Fe]ZSM-5, H-[B]ZSM-5, silicalite, P-SPP, tungstated zirconia, ZrO2, and γ-Al2O3 were studied using H-D exchange with toluene and chlorobenzene. Temperature programmed desorption (TPD) of toluene-h8 and chlorobenzene-h5 from the deuterated forms of H-[Al]ZSM-5, H-[Fe]ZSM-5, and P-SPP demonstrated that the temperature at which H-D exchange rates become significant change with the proton affinity of the aromatic molecule and the strength of the Brønsted sites. The steady-state, gas-phase reaction between D2O and the aromatic molecules were consistent with the TPD results and allowed the Brønsted-acid site strengths to be ordered as follows: H-[Al]ZSM-5 > H-[Fe]ZSM-5 > tungstated zirconia > P-SPP > H-[B]ZSM-5. H-D exchange was also observed at high temperatures with ZrO2 and γ-Al2O3 but it appears that the reaction mechanism with these Lewis acids is different because reaction with toluene and chlorobenzene occur at nearly the same temperature. It is suggested that the H-D exchange reaction with simple aromatic molecules is a useful way to probe Brønsted acidity in solids

Authors:
; ; ; ; ORCiD logo
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Catalysis Center for Energy Innovation (CCEI); Univ. of Delaware, Newark, DE (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1566413
DOE Contract Number:  
SC0001004
Resource Type:
Journal Article
Journal Name:
Catalysis Letters
Additional Journal Information:
Journal Volume: 148; Journal Issue: 11; Journal ID: ISSN 1011-372X
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
catalysis (homogeneous), catalysis (heterogeneous), biofuels (including algae and biomass), bio-inspired, hydrogen and fuel cells, materials and chemistry by design, synthesis (novel materials), synthesis (self-assembly), synthesis (scalable processing)

Citation Formats

Wang, Cong, Li, Sha, Mao, Xinyu, Caratzoulas, Stavros, and Gorte, Raymond J. H-D Exchange of Simple Aromatics as a Measure of Brønsted-Acid Site Strengths in Solids. United States: N. p., 2018. Web. doi:10.1007/s10562-018-2563-5.
Wang, Cong, Li, Sha, Mao, Xinyu, Caratzoulas, Stavros, & Gorte, Raymond J. H-D Exchange of Simple Aromatics as a Measure of Brønsted-Acid Site Strengths in Solids. United States. doi:10.1007/s10562-018-2563-5.
Wang, Cong, Li, Sha, Mao, Xinyu, Caratzoulas, Stavros, and Gorte, Raymond J. Tue . "H-D Exchange of Simple Aromatics as a Measure of Brønsted-Acid Site Strengths in Solids". United States. doi:10.1007/s10562-018-2563-5.
@article{osti_1566413,
title = {H-D Exchange of Simple Aromatics as a Measure of Brønsted-Acid Site Strengths in Solids},
author = {Wang, Cong and Li, Sha and Mao, Xinyu and Caratzoulas, Stavros and Gorte, Raymond J.},
abstractNote = {The relative Brønsted-acid strengths of H-[Al]ZSM-5, H-[Fe]ZSM-5, H-[B]ZSM-5, silicalite, P-SPP, tungstated zirconia, ZrO2, and γ-Al2O3 were studied using H-D exchange with toluene and chlorobenzene. Temperature programmed desorption (TPD) of toluene-h8 and chlorobenzene-h5 from the deuterated forms of H-[Al]ZSM-5, H-[Fe]ZSM-5, and P-SPP demonstrated that the temperature at which H-D exchange rates become significant change with the proton affinity of the aromatic molecule and the strength of the Brønsted sites. The steady-state, gas-phase reaction between D2O and the aromatic molecules were consistent with the TPD results and allowed the Brønsted-acid site strengths to be ordered as follows: H-[Al]ZSM-5 > H-[Fe]ZSM-5 > tungstated zirconia > P-SPP > H-[B]ZSM-5. H-D exchange was also observed at high temperatures with ZrO2 and γ-Al2O3 but it appears that the reaction mechanism with these Lewis acids is different because reaction with toluene and chlorobenzene occur at nearly the same temperature. It is suggested that the H-D exchange reaction with simple aromatic molecules is a useful way to probe Brønsted acidity in solids},
doi = {10.1007/s10562-018-2563-5},
journal = {Catalysis Letters},
issn = {1011-372X},
number = 11,
volume = 148,
place = {United States},
year = {2018},
month = {9}
}

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