Tungstated zirconia catalyzed bromination of phenol red under nearly neutral solution

She Tin Wong; Chi Chau Hwang; Chung Yuan Mou

doi:10.1016/j.apcatb.2005.08.001

Tungstated zirconia catalyzed bromination of phenol red under nearly neutral solution

She Tin Wong, Chi Chau Hwang, Chung Yuan Mou

Research output: Contribution to journal › Article › peer-review

38 Citations (Scopus)

Abstract

The performance of tungstated zirconia catalysts prepared by co-precipitation (WZ) and impregnation (W/m-ZrO₂) techniques in phenol red bromination reaction was tested. Both types of catalysts showed excellent activity in this reaction in aqueous solution. The activity of WZ increases as the W loading decreases and the most active 0.6WZ catalyst contained highly dispersed WO_x of low surface density on zirconia. The W/m-ZrO₂ catalysts showed even higher activity in this reaction but maximum performance is observed for 1.3W/m-ZrO₂ instead. The active site for the redox reaction is probably the monomer or dimer of WO _x with a single oxo group whereas low surface density of WO _x provides enough space on zirconia for the adsorption of phenol red without blocking the redox sites.

Original language	English
Pages (from-to)	1-8
Number of pages	8
Journal	Applied Catalysis B: Environmental
Volume	63
Issue number	1-2
DOIs	https://doi.org/10.1016/j.apcatb.2005.08.001
Publication status	Published - Mar 22 2006
Externally published	Yes

Keywords

Bromination
EXAFS
Mesoporous zirconia
Phenol red
Tungstated zirconia
XPS

ASJC Scopus subject areas

Catalysis
General Environmental Science
Process Chemistry and Technology

Access to Document

10.1016/j.apcatb.2005.08.001

Cite this

@article{75b9d58e2c0e4e159ff5c7fa51dd350b,

title = "Tungstated zirconia catalyzed bromination of phenol red under nearly neutral solution",

abstract = "The performance of tungstated zirconia catalysts prepared by co-precipitation (WZ) and impregnation (W/m-ZrO2) techniques in phenol red bromination reaction was tested. Both types of catalysts showed excellent activity in this reaction in aqueous solution. The activity of WZ increases as the W loading decreases and the most active 0.6WZ catalyst contained highly dispersed WOx of low surface density on zirconia. The W/m-ZrO2 catalysts showed even higher activity in this reaction but maximum performance is observed for 1.3W/m-ZrO2 instead. The active site for the redox reaction is probably the monomer or dimer of WO x with a single oxo group whereas low surface density of WO x provides enough space on zirconia for the adsorption of phenol red without blocking the redox sites.",

keywords = "Bromination, EXAFS, Mesoporous zirconia, Phenol red, Tungstated zirconia, XPS",

author = "Wong, {She Tin} and Hwang, {Chi Chau} and Mou, {Chung Yuan}",

note = "Funding Information: This work was supported by a grant from the National Science Council of Taiwan through Academy Excellence program (NSC-93-2752-M-002-PAE).",

year = "2006",

month = mar,

day = "22",

doi = "10.1016/j.apcatb.2005.08.001",

language = "English",

volume = "63",

pages = "1--8",

journal = "Applied Catalysis B: Environmental",

issn = "0926-3373",

publisher = "Elsevier B.V.",

number = "1-2",

}

TY - JOUR

T1 - Tungstated zirconia catalyzed bromination of phenol red under nearly neutral solution

AU - Wong, She Tin

AU - Hwang, Chi Chau

AU - Mou, Chung Yuan

N1 - Funding Information: This work was supported by a grant from the National Science Council of Taiwan through Academy Excellence program (NSC-93-2752-M-002-PAE).

PY - 2006/3/22

Y1 - 2006/3/22

N2 - The performance of tungstated zirconia catalysts prepared by co-precipitation (WZ) and impregnation (W/m-ZrO2) techniques in phenol red bromination reaction was tested. Both types of catalysts showed excellent activity in this reaction in aqueous solution. The activity of WZ increases as the W loading decreases and the most active 0.6WZ catalyst contained highly dispersed WOx of low surface density on zirconia. The W/m-ZrO2 catalysts showed even higher activity in this reaction but maximum performance is observed for 1.3W/m-ZrO2 instead. The active site for the redox reaction is probably the monomer or dimer of WO x with a single oxo group whereas low surface density of WO x provides enough space on zirconia for the adsorption of phenol red without blocking the redox sites.

AB - The performance of tungstated zirconia catalysts prepared by co-precipitation (WZ) and impregnation (W/m-ZrO2) techniques in phenol red bromination reaction was tested. Both types of catalysts showed excellent activity in this reaction in aqueous solution. The activity of WZ increases as the W loading decreases and the most active 0.6WZ catalyst contained highly dispersed WOx of low surface density on zirconia. The W/m-ZrO2 catalysts showed even higher activity in this reaction but maximum performance is observed for 1.3W/m-ZrO2 instead. The active site for the redox reaction is probably the monomer or dimer of WO x with a single oxo group whereas low surface density of WO x provides enough space on zirconia for the adsorption of phenol red without blocking the redox sites.

KW - Bromination

KW - EXAFS

KW - Mesoporous zirconia

KW - Phenol red

KW - Tungstated zirconia

KW - XPS

UR - http://www.scopus.com/inward/record.url?scp=32644459342&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=32644459342&partnerID=8YFLogxK

U2 - 10.1016/j.apcatb.2005.08.001

DO - 10.1016/j.apcatb.2005.08.001

M3 - Article

AN - SCOPUS:32644459342

SN - 0926-3373

VL - 63

SP - 1

EP - 8

JO - Applied Catalysis B: Environmental

JF - Applied Catalysis B: Environmental

IS - 1-2

ER -

Tungstated zirconia catalyzed bromination of phenol red under nearly neutral solution

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this