The zirconium sulfate microcrystal structure in relation to their activity in the esterification

Joon Ching Juan, Jingchang Zhang, Yajie Jiang, Weiliang Cao, Mohd. Ambar Yarmo

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Zirconium sulfate (ZS) varying in crystalline phase from hydrate to anhydrous was prepared at different treatment temperature. The relationship between microcrystal structure at different treatment temperature and activity in esterification was evaluated. The number of acid groups was found to increase with increased of pretreatment temperature, except for the samples treated above 330 °C. For that sample, it is observed that hydration of crystalline water to anhydrous phase is significant at temperature of 330-420 °C, reducing the surface acidity. The reaction was poisoned by the exchange of surface protons on ZS with Cs+. Thus, the major effective active sites must be the protons acidity. It was demonstrated that the microcrystal structure and catalytic activity of ZS was affected by thermal treatment due to changes in crystalline water.

Original languageEnglish
Pages (from-to)91-95
Number of pages5
JournalJournal of Molecular Catalysis A: Chemical
Volume272
Issue number1-2
DOIs
Publication statusPublished - 2 Jul 2007

Fingerprint

Microcrystals
microcrystals
Esterification
Zirconium
Sulfates
sulfates
Crystalline materials
Acidity
acidity
Protons
Temperature
temperature
protons
Water
Hydrates
Hydration
hydrates
pretreatment
water
hydration

Keywords

  • Acid catalyst
  • Esterification
  • Thermal treatment
  • Zirconium sulfate

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology
  • Materials Science (miscellaneous)

Cite this

The zirconium sulfate microcrystal structure in relation to their activity in the esterification. / Juan, Joon Ching; Zhang, Jingchang; Jiang, Yajie; Cao, Weiliang; Yarmo, Mohd. Ambar.

In: Journal of Molecular Catalysis A: Chemical, Vol. 272, No. 1-2, 02.07.2007, p. 91-95.

Research output: Contribution to journalArticle

Juan, Joon Ching ; Zhang, Jingchang ; Jiang, Yajie ; Cao, Weiliang ; Yarmo, Mohd. Ambar. / The zirconium sulfate microcrystal structure in relation to their activity in the esterification. In: Journal of Molecular Catalysis A: Chemical. 2007 ; Vol. 272, No. 1-2. pp. 91-95.
@article{4e5c785fa13841a3848c3537e1bc9104,
title = "The zirconium sulfate microcrystal structure in relation to their activity in the esterification",
abstract = "Zirconium sulfate (ZS) varying in crystalline phase from hydrate to anhydrous was prepared at different treatment temperature. The relationship between microcrystal structure at different treatment temperature and activity in esterification was evaluated. The number of acid groups was found to increase with increased of pretreatment temperature, except for the samples treated above 330 °C. For that sample, it is observed that hydration of crystalline water to anhydrous phase is significant at temperature of 330-420 °C, reducing the surface acidity. The reaction was poisoned by the exchange of surface protons on ZS with Cs+. Thus, the major effective active sites must be the protons acidity. It was demonstrated that the microcrystal structure and catalytic activity of ZS was affected by thermal treatment due to changes in crystalline water.",
keywords = "Acid catalyst, Esterification, Thermal treatment, Zirconium sulfate",
author = "Juan, {Joon Ching} and Jingchang Zhang and Yajie Jiang and Weiliang Cao and Yarmo, {Mohd. Ambar}",
year = "2007",
month = "7",
day = "2",
doi = "10.1016/j.molcata.2007.03.028",
language = "English",
volume = "272",
pages = "91--95",
journal = "Journal of Molecular Catalysis A: Chemical",
issn = "1381-1169",
publisher = "Elsevier",
number = "1-2",

}

TY - JOUR

T1 - The zirconium sulfate microcrystal structure in relation to their activity in the esterification

AU - Juan, Joon Ching

AU - Zhang, Jingchang

AU - Jiang, Yajie

AU - Cao, Weiliang

AU - Yarmo, Mohd. Ambar

PY - 2007/7/2

Y1 - 2007/7/2

N2 - Zirconium sulfate (ZS) varying in crystalline phase from hydrate to anhydrous was prepared at different treatment temperature. The relationship between microcrystal structure at different treatment temperature and activity in esterification was evaluated. The number of acid groups was found to increase with increased of pretreatment temperature, except for the samples treated above 330 °C. For that sample, it is observed that hydration of crystalline water to anhydrous phase is significant at temperature of 330-420 °C, reducing the surface acidity. The reaction was poisoned by the exchange of surface protons on ZS with Cs+. Thus, the major effective active sites must be the protons acidity. It was demonstrated that the microcrystal structure and catalytic activity of ZS was affected by thermal treatment due to changes in crystalline water.

AB - Zirconium sulfate (ZS) varying in crystalline phase from hydrate to anhydrous was prepared at different treatment temperature. The relationship between microcrystal structure at different treatment temperature and activity in esterification was evaluated. The number of acid groups was found to increase with increased of pretreatment temperature, except for the samples treated above 330 °C. For that sample, it is observed that hydration of crystalline water to anhydrous phase is significant at temperature of 330-420 °C, reducing the surface acidity. The reaction was poisoned by the exchange of surface protons on ZS with Cs+. Thus, the major effective active sites must be the protons acidity. It was demonstrated that the microcrystal structure and catalytic activity of ZS was affected by thermal treatment due to changes in crystalline water.

KW - Acid catalyst

KW - Esterification

KW - Thermal treatment

KW - Zirconium sulfate

UR - http://www.scopus.com/inward/record.url?scp=34249340831&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34249340831&partnerID=8YFLogxK

U2 - 10.1016/j.molcata.2007.03.028

DO - 10.1016/j.molcata.2007.03.028

M3 - Article

VL - 272

SP - 91

EP - 95

JO - Journal of Molecular Catalysis A: Chemical

JF - Journal of Molecular Catalysis A: Chemical

SN - 1381-1169

IS - 1-2

ER -