[Studies in Surface Science and Catalysis] Zeolites and Mesoporous Materials at the dawn of the 21st...

152 25-0-02 - Facile Friedei-Craft's alkylation of phenol with 4-hydroxybutan- 2-one over 13 and Y zeolites to produce raspberry ketone K.K. Cheralathan, I.S. Kumar, B. Arabindoo, M. Palanichamy and V. Murugesan* Department of Chemistry, Anna University, Chennai, India- v [email protected] Friedel-Craft's alkylation of phenol with 4-hydroxybutan-2-one was investigated over HI3, HY and Zn 2+ and Fe 3+ ion exchanged [3 and Y zeolites. The expected para-alkylated product raspberry ketone [4-(4-hydroxyphenyl)butan-2-one] was obtained regioselectively over HI3 (SIO2/A1203=10) catalyst in 77% yield. The para product is formed not only by direct alkylation but also by the facile rearrangement of O-alkylated product. HY and cation exchanged catalysts yielded O-alkylated, para-alkylated and small amount of ortho-alkylated products. 25-0-03 - Selective alkylation of naphthalene to 2,6-dimethylnaphthalene catalyzed by MTW zeolite G. Pazzuconi a, G. Terzoni b, C. Perego a and G. Bellussi a a EniTecnologie S.p.A., San Donato Milanese, [email protected], Italy b EniChem S.p.A., San Donato Milanese, Italy The methylation of naphthalene and methylnaphthalene with zeolitic catalysts was studied. The main purpose was to achieve a selective synthesis of 2,6-dimethylnaphthalene (2,6-dmn). The alkylation of naphthalene with methanol didn't give interesting results. Best performances were obtained with 1,2,4-trimethylbenzene as solvent/reagent, together with methanol. In such chemical system, among several medium and large pore zeolites, MTW stands out for both activity and selectivity to 2,6-dmn. As transalkylation is the main reaction, this behavior can be explained if a restricted transition state shape selectivity takes place. 25-0-04 - Transalkylation reaction of phenol with trimethylbenzenes over Y and EMT zeolites V. Hulea (a), I. Fechete (a), P. Caullet (c), H. Kessler (c), T. Hulea (a), C. Chelaru (b), C. Guimon (d) and E. Dumitriu (a) a Iasi Technical University, Iasi, [email protected]~ Romania; b Institute of Macromolecular Chemistry, Iasi, Romania; c Ecole Nationale Sup~rieure de Chimie de Mulhouse, France ; d Laboratoire de Physico-Chimie MoHculaire, Pau, France The catalytic properties of dealuminated Y and EMT-type zeolites for the vapor phase transalkylation reaction of phenol with the trimethylbenzenes were investigated. The influence of the reaction temperature, the degree of dealumination and the concentration of acid sites, and the nature of the TMB isomer, were taken into account. High catalytic performances (activity and selectivity to cresols) and good resistance to coking of the dealuminated zeolites were observed.

Upload
kk
Category

Documents
view
212
download
0

Embed Size (px):

Transcript of [Studies in Surface Science and Catalysis] Zeolites and Mesoporous Materials at the dawn of the 21st...

Page 1: [Studies in Surface Science and Catalysis] Zeolites and Mesoporous Materials at the dawn of the 21st century, Proceedings of the 13th International Zeolite Conference, Volume 135 ||

152

25-0-02 - Facile Friedei-Craft's alkylation of phenol with 4-hydroxybutan- 2-one over 13 and Y zeolites to produce raspberry ketone K.K. Cheralathan, I.S. Kumar, B. Arabindoo, M. Palanichamy and V. Murugesan* Department of Chemistry, Anna University, Chennai, India- v [email protected]

Friedel-Craft's alkylation of phenol with 4-hydroxybutan-2-one was investigated over HI3, HY and Zn 2+ and Fe 3+ ion exchanged [3 and Y zeolites. The expected para-alkylated product raspberry ketone [4-(4-hydroxyphenyl)butan-2-one] was obtained regioselectively over HI3 (SIO2/A1203=10) catalyst in 77% yield. The para product is formed not only by direct alkylation but also by the facile rearrangement of O-alkylated product. HY and cation exchanged catalysts yielded O-alkylated, para-alkylated and small amount of ortho-alkylated products.

25-0-03 - Selective alkylation of naphthalene to 2,6-dimethylnaphthalene catalyzed by MTW zeolite G. Pazzuconi a, G. Terzoni b, C. Perego a and G. Bellussi a a EniTecnologie S.p.A., San Donato Milanese, [email protected], Italy b EniChem S.p.A., San Donato Milanese, Italy

The methylation of naphthalene and methylnaphthalene with zeolitic catalysts was studied. The main purpose was to achieve a selective synthesis of 2,6-dimethylnaphthalene (2,6-dmn). The alkylation of naphthalene with methanol didn't give interesting results. Best performances were obtained with 1,2,4-trimethylbenzene as solvent/reagent, together with methanol. In such chemical system, among several medium and large pore zeolites, MTW stands out for both activity and selectivity to 2,6-dmn. As transalkylation is the main reaction, this behavior can be explained if a restricted transition state shape selectivity takes place.

25-0-04 - Transalkylation reaction of phenol with trimethylbenzenes over Y and EMT zeolites V. Hulea (a), I. Fechete (a), P. Caullet (c), H. Kessler (c), T. Hulea (a), C. Chelaru (b), C. Guimon (d) and E. Dumitriu (a) a Iasi Technical University, Iasi, [email protected]~ Romania; b Institute of Macromolecular Chemistry, Iasi, Romania; c Ecole Nationale Sup~rieure de Chimie de Mulhouse, France ; d Laboratoire de Physico-Chimie MoHculaire, Pau, France

The catalytic properties of dealuminated Y and EMT-type zeolites for the vapor phase transalkylation reaction of phenol with the trimethylbenzenes were investigated. The influence of the reaction temperature, the degree of dealumination and the concentration of acid sites, and the nature of the TMB isomer, were taken into account. High catalytic performances (activity and selectivity to cresols) and good resistance to coking of the dealuminated zeolites were observed.