Modified TS-1 for shape selective phenol hydroxylation to hydroquinone

N. K. Mal; P. Kumar; M. Sasidharan; M. Matsukata

doi:10.1016/s0167-2991(04)80532-9

Modified TS-1 for shape selective phenol hydroxylation to hydroquinone

N. K. Mal^*, P. Kumar, M. Sasidharan, M. Matsukata

^*Corresponding author for this work

School of Advanced Science and Engineering

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

3 Citations (Scopus)

Abstract

A new method of modification of TS-1 by weak base (aqueous NH₃) treatment leads to formation of bigger crystals and generation of internal hydroxyl groups as evident by SEM and IR (hydroxyl region). All the catalysts were characterized using, XRD, N₂-sorption, UV-VIS, FT-IR and SEM. Activity of the modified and unmodified TS-1 were compare in the hydroxylation of phenol to hydroquinone and catechol in presence of aqueous H ₂O₂. A ratio of hydroquinone to catechol over modified, (TS-1(33)/OH₁ and unmodified, TS-1(33) catalysts were 1.40 and 1.15, respectively, using H₂O as solvent, and 2.01 and 1.68, respectively, using MeOH as solvent. Modification of TS-1 with strong base (e.g. NaOH) causes decrease in crystallinity, and hence decreases the conversion of phenol and selectivity of hydroquinone. A new mechanism controlling the product selectivity is proposed.

Original language	English
Pages (from-to)	2618-2625
Number of pages	8
Journal	Studies in Surface Science and Catalysis
Volume	154 C
DOIs	https://doi.org/10.1016/s0167-2991(04)80532-9
Publication status	Published - 2004

Keywords

Hydroquinone
Microporous zeolite
SEM
Titanium silicate-1

ASJC Scopus subject areas

Catalysis
Condensed Matter Physics
Physical and Theoretical Chemistry
Surfaces, Coatings and Films
Materials Chemistry

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10.1016/s0167-2991(04)80532-9

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@article{a0e79d163c7748328dd80819a1dfbe11,

title = "Modified TS-1 for shape selective phenol hydroxylation to hydroquinone",

abstract = "A new method of modification of TS-1 by weak base (aqueous NH3) treatment leads to formation of bigger crystals and generation of internal hydroxyl groups as evident by SEM and IR (hydroxyl region). All the catalysts were characterized using, XRD, N2-sorption, UV-VIS, FT-IR and SEM. Activity of the modified and unmodified TS-1 were compare in the hydroxylation of phenol to hydroquinone and catechol in presence of aqueous H 2O2. A ratio of hydroquinone to catechol over modified, (TS-1(33)/OH1 and unmodified, TS-1(33) catalysts were 1.40 and 1.15, respectively, using H2O as solvent, and 2.01 and 1.68, respectively, using MeOH as solvent. Modification of TS-1 with strong base (e.g. NaOH) causes decrease in crystallinity, and hence decreases the conversion of phenol and selectivity of hydroquinone. A new mechanism controlling the product selectivity is proposed.",

keywords = "Hydroquinone, Microporous zeolite, SEM, Titanium silicate-1",

author = "Mal, {N. K.} and P. Kumar and M. Sasidharan and M. Matsukata",

year = "2004",

doi = "10.1016/s0167-2991(04)80532-9",

language = "English",

volume = "154 C",

pages = "2618--2625",

journal = "Studies in Surface Science and Catalysis",

issn = "0167-2991",

publisher = "Elsevier BV",

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TY - JOUR

T1 - Modified TS-1 for shape selective phenol hydroxylation to hydroquinone

AU - Mal, N. K.

AU - Kumar, P.

AU - Sasidharan, M.

AU - Matsukata, M.

PY - 2004

Y1 - 2004

N2 - A new method of modification of TS-1 by weak base (aqueous NH3) treatment leads to formation of bigger crystals and generation of internal hydroxyl groups as evident by SEM and IR (hydroxyl region). All the catalysts were characterized using, XRD, N2-sorption, UV-VIS, FT-IR and SEM. Activity of the modified and unmodified TS-1 were compare in the hydroxylation of phenol to hydroquinone and catechol in presence of aqueous H 2O2. A ratio of hydroquinone to catechol over modified, (TS-1(33)/OH1 and unmodified, TS-1(33) catalysts were 1.40 and 1.15, respectively, using H2O as solvent, and 2.01 and 1.68, respectively, using MeOH as solvent. Modification of TS-1 with strong base (e.g. NaOH) causes decrease in crystallinity, and hence decreases the conversion of phenol and selectivity of hydroquinone. A new mechanism controlling the product selectivity is proposed.

AB - A new method of modification of TS-1 by weak base (aqueous NH3) treatment leads to formation of bigger crystals and generation of internal hydroxyl groups as evident by SEM and IR (hydroxyl region). All the catalysts were characterized using, XRD, N2-sorption, UV-VIS, FT-IR and SEM. Activity of the modified and unmodified TS-1 were compare in the hydroxylation of phenol to hydroquinone and catechol in presence of aqueous H 2O2. A ratio of hydroquinone to catechol over modified, (TS-1(33)/OH1 and unmodified, TS-1(33) catalysts were 1.40 and 1.15, respectively, using H2O as solvent, and 2.01 and 1.68, respectively, using MeOH as solvent. Modification of TS-1 with strong base (e.g. NaOH) causes decrease in crystallinity, and hence decreases the conversion of phenol and selectivity of hydroquinone. A new mechanism controlling the product selectivity is proposed.

KW - Hydroquinone

KW - Microporous zeolite

KW - SEM

KW - Titanium silicate-1

UR - http://www.scopus.com/inward/record.url?scp=11844281495&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=11844281495&partnerID=8YFLogxK

U2 - 10.1016/s0167-2991(04)80532-9

DO - 10.1016/s0167-2991(04)80532-9

M3 - Article

AN - SCOPUS:11844281495

SN - 0167-2991

VL - 154 C

SP - 2618

EP - 2625

JO - Studies in Surface Science and Catalysis

JF - Studies in Surface Science and Catalysis

ER -

Modified TS-1 for shape selective phenol hydroxylation to hydroquinone

Abstract

Keywords

ASJC Scopus subject areas

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