Novel mesoporous TiO2(B) whisker-supported sulfated solid superacid with unique acid characteristics and catalytic performances

Licheng Li, Haiqin Yue, Tuo Ji, Wei Li, Xuejuan Zhao, Lei Wang, Jie She, Xiaoli Gu, Xiaobao Li

Research output: Contribution to journalArticle

Abstract

Mesoporous TiO2(B) whisker was firstly applied as a support for synthesizing the novel sulfated solid superacid (SO42−/TiO2(B)). According to NH3-TPD, TG and Py-IR characterization results, it was found that the similar amount of sulfate group on TiO2(B) and anatase showed significantly different acid characteristics and catalytic performances. The total acid amount of SO42−/TiO2(B) was about 1.8 times as anatase-supported sulfated solid superacid (SO42−/Anatase). Simultaneously, the SO42−/TiO2(B) possessed higher percentage of Brønsted acid and more weak-medium acid strength than SO42−/Anatase. These acidic properties endowed SO42−/TiO2(B) with the increased esterification reaction rate and decreased alkylation byproduct selectivity compared with that of SO42−/Anatase. Structure-performance analysis exhibited that there were more bridged bidentate sulfate groups coordinated to the TiO2(B) in SO42−/TiO2(B), which could induce more Ti cations than that of the chelating one. This was the key factor to be responsible for the unique acid characteristics of SO42−/TiO2(B). The present work provides a novel solid superacid and might open a strategy to mediate the acid characteristic for sulfated solid superacid.
Original languageEnglish
Pages (from-to)25-32
Number of pages8
JournalApplied Catalysis A: General
Volume574
Early online date29 Jan 2019
DOIs
Publication statusPublished - 25 Mar 2019

Fingerprint

Titanium dioxide
Acids
Sulfates
Catalyst selectivity
Alkylation
Esterification
Temperature programmed desorption
Chelation
Reaction rates
Byproducts
Cations
Positive ions
titanium dioxide

Bibliographical note

© 2019, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

Keywords

  • Acid properties
  • Catalysis
  • Coordination
  • Sulfated solid superacid
  • TiO (B)

Cite this

Li, Licheng ; Yue, Haiqin ; Ji, Tuo ; Li, Wei ; Zhao, Xuejuan ; Wang, Lei ; She, Jie ; Gu, Xiaoli ; Li, Xiaobao. / Novel mesoporous TiO2(B) whisker-supported sulfated solid superacid with unique acid characteristics and catalytic performances. In: Applied Catalysis A: General. 2019 ; Vol. 574. pp. 25-32.
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Novel mesoporous TiO2(B) whisker-supported sulfated solid superacid with unique acid characteristics and catalytic performances. / Li, Licheng; Yue, Haiqin; Ji, Tuo; Li, Wei; Zhao, Xuejuan; Wang, Lei; She, Jie; Gu, Xiaoli; Li, Xiaobao.

In: Applied Catalysis A: General, Vol. 574, 25.03.2019, p. 25-32.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Novel mesoporous TiO2(B) whisker-supported sulfated solid superacid with unique acid characteristics and catalytic performances

AU - Li, Licheng

AU - Yue, Haiqin

AU - Ji, Tuo

AU - Li, Wei

AU - Zhao, Xuejuan

AU - Wang, Lei

AU - She, Jie

AU - Gu, Xiaoli

AU - Li, Xiaobao

N1 - © 2019, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

PY - 2019/3/25

Y1 - 2019/3/25

N2 - Mesoporous TiO2(B) whisker was firstly applied as a support for synthesizing the novel sulfated solid superacid (SO42−/TiO2(B)). According to NH3-TPD, TG and Py-IR characterization results, it was found that the similar amount of sulfate group on TiO2(B) and anatase showed significantly different acid characteristics and catalytic performances. The total acid amount of SO42−/TiO2(B) was about 1.8 times as anatase-supported sulfated solid superacid (SO42−/Anatase). Simultaneously, the SO42−/TiO2(B) possessed higher percentage of Brønsted acid and more weak-medium acid strength than SO42−/Anatase. These acidic properties endowed SO42−/TiO2(B) with the increased esterification reaction rate and decreased alkylation byproduct selectivity compared with that of SO42−/Anatase. Structure-performance analysis exhibited that there were more bridged bidentate sulfate groups coordinated to the TiO2(B) in SO42−/TiO2(B), which could induce more Ti cations than that of the chelating one. This was the key factor to be responsible for the unique acid characteristics of SO42−/TiO2(B). The present work provides a novel solid superacid and might open a strategy to mediate the acid characteristic for sulfated solid superacid.

AB - Mesoporous TiO2(B) whisker was firstly applied as a support for synthesizing the novel sulfated solid superacid (SO42−/TiO2(B)). According to NH3-TPD, TG and Py-IR characterization results, it was found that the similar amount of sulfate group on TiO2(B) and anatase showed significantly different acid characteristics and catalytic performances. The total acid amount of SO42−/TiO2(B) was about 1.8 times as anatase-supported sulfated solid superacid (SO42−/Anatase). Simultaneously, the SO42−/TiO2(B) possessed higher percentage of Brønsted acid and more weak-medium acid strength than SO42−/Anatase. These acidic properties endowed SO42−/TiO2(B) with the increased esterification reaction rate and decreased alkylation byproduct selectivity compared with that of SO42−/Anatase. Structure-performance analysis exhibited that there were more bridged bidentate sulfate groups coordinated to the TiO2(B) in SO42−/TiO2(B), which could induce more Ti cations than that of the chelating one. This was the key factor to be responsible for the unique acid characteristics of SO42−/TiO2(B). The present work provides a novel solid superacid and might open a strategy to mediate the acid characteristic for sulfated solid superacid.

KW - Acid properties

KW - Catalysis

KW - Coordination

KW - Sulfated solid superacid

KW - TiO (B)

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