Shape-selective methylation of aromatics for environmentally friendly synthesis of specialty chemicals over zeolite catalysts

Xinwen Guo, Chen Zhang, Yan Zhao, Anfeng Zhang, Min Liu, Xiangsheng Wang, Chunshan Song

Research output: Contribution to journalConference article

Abstract

In this paper, we summarize the recent studies on shape-selective catalysis for methylation of aromatics in our group. Shape-selective methylation of toluene with methanol was studied over modified nano-scale HZSM-5, it was found that p-xylene selectivity of 28% over nano-scale HZSM-5 is close to its equilibrium value (p-xylene 24%, m-xylene 51%, o-xylene 25%) in three xylene isomers. After modification with Si, P and Mg, the catalyst exhibits higher p-xylene selectivity (near 100%). Unluckily, the conversion of toluene decreases from 23.3% to about 15% during 50 h reaction on stream. However, the catalyst modified with Pt demonstrated distinct improvement in activity. The conversion of toluene over catalyst loaded 0.3% Pt maintains a constant value of 23% and p-xylene selectivity is a constant 98% during 500 h reaction on stream. For the shape-selective methylation of biphenyl with methanol, after hydrothermal treatment, the catalytic selectivity to 4,4′-DMBP is up to 70%, while the 4-MBP conversion is about 12%. For the shape-selective methylation of naphthalene with methanol, the comprehensive modification of NH 4 F and SrO leads to an increase in the 2, 6-DMN selectivity (2, 6-DMN to DMN), up to 64.8% when 2-MN conversion is 10%. However, for the shape selective methylation of poly-aromatics, Pt modification can not improve the stability due to the isomerization of reactants.

Original languageEnglish (US)
JournalACS National Meeting Book of Abstracts
StatePublished - Dec 1 2010
Event240th ACS National Meeting and Exposition - Boston, MA, United States
Duration: Aug 22 2010Aug 26 2010

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Zeolites
Methylation
Xylene
Toluene
Catalysts
Methanol
Xylenes
Catalyst selectivity
Isomerization
Isomers
Catalysis
Catalyst activity
Naphthalene
4-xylene

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

@article{0f779fc5636c4c79b17ef4db7cf4b2fb,
title = "Shape-selective methylation of aromatics for environmentally friendly synthesis of specialty chemicals over zeolite catalysts",
abstract = "In this paper, we summarize the recent studies on shape-selective catalysis for methylation of aromatics in our group. Shape-selective methylation of toluene with methanol was studied over modified nano-scale HZSM-5, it was found that p-xylene selectivity of 28{\%} over nano-scale HZSM-5 is close to its equilibrium value (p-xylene 24{\%}, m-xylene 51{\%}, o-xylene 25{\%}) in three xylene isomers. After modification with Si, P and Mg, the catalyst exhibits higher p-xylene selectivity (near 100{\%}). Unluckily, the conversion of toluene decreases from 23.3{\%} to about 15{\%} during 50 h reaction on stream. However, the catalyst modified with Pt demonstrated distinct improvement in activity. The conversion of toluene over catalyst loaded 0.3{\%} Pt maintains a constant value of 23{\%} and p-xylene selectivity is a constant 98{\%} during 500 h reaction on stream. For the shape-selective methylation of biphenyl with methanol, after hydrothermal treatment, the catalytic selectivity to 4,4′-DMBP is up to 70{\%}, while the 4-MBP conversion is about 12{\%}. For the shape-selective methylation of naphthalene with methanol, the comprehensive modification of NH 4 F and SrO leads to an increase in the 2, 6-DMN selectivity (2, 6-DMN to DMN), up to 64.8{\%} when 2-MN conversion is 10{\%}. However, for the shape selective methylation of poly-aromatics, Pt modification can not improve the stability due to the isomerization of reactants.",
author = "Xinwen Guo and Chen Zhang and Yan Zhao and Anfeng Zhang and Min Liu and Xiangsheng Wang and Chunshan Song",
year = "2010",
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journal = "ACS National Meeting Book of Abstracts",
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Shape-selective methylation of aromatics for environmentally friendly synthesis of specialty chemicals over zeolite catalysts. / Guo, Xinwen; Zhang, Chen; Zhao, Yan; Zhang, Anfeng; Liu, Min; Wang, Xiangsheng; Song, Chunshan.

In: ACS National Meeting Book of Abstracts, 01.12.2010.

Research output: Contribution to journalConference article

TY - JOUR

T1 - Shape-selective methylation of aromatics for environmentally friendly synthesis of specialty chemicals over zeolite catalysts

AU - Guo, Xinwen

AU - Zhang, Chen

AU - Zhao, Yan

AU - Zhang, Anfeng

AU - Liu, Min

AU - Wang, Xiangsheng

AU - Song, Chunshan

PY - 2010/12/1

Y1 - 2010/12/1

N2 - In this paper, we summarize the recent studies on shape-selective catalysis for methylation of aromatics in our group. Shape-selective methylation of toluene with methanol was studied over modified nano-scale HZSM-5, it was found that p-xylene selectivity of 28% over nano-scale HZSM-5 is close to its equilibrium value (p-xylene 24%, m-xylene 51%, o-xylene 25%) in three xylene isomers. After modification with Si, P and Mg, the catalyst exhibits higher p-xylene selectivity (near 100%). Unluckily, the conversion of toluene decreases from 23.3% to about 15% during 50 h reaction on stream. However, the catalyst modified with Pt demonstrated distinct improvement in activity. The conversion of toluene over catalyst loaded 0.3% Pt maintains a constant value of 23% and p-xylene selectivity is a constant 98% during 500 h reaction on stream. For the shape-selective methylation of biphenyl with methanol, after hydrothermal treatment, the catalytic selectivity to 4,4′-DMBP is up to 70%, while the 4-MBP conversion is about 12%. For the shape-selective methylation of naphthalene with methanol, the comprehensive modification of NH 4 F and SrO leads to an increase in the 2, 6-DMN selectivity (2, 6-DMN to DMN), up to 64.8% when 2-MN conversion is 10%. However, for the shape selective methylation of poly-aromatics, Pt modification can not improve the stability due to the isomerization of reactants.

AB - In this paper, we summarize the recent studies on shape-selective catalysis for methylation of aromatics in our group. Shape-selective methylation of toluene with methanol was studied over modified nano-scale HZSM-5, it was found that p-xylene selectivity of 28% over nano-scale HZSM-5 is close to its equilibrium value (p-xylene 24%, m-xylene 51%, o-xylene 25%) in three xylene isomers. After modification with Si, P and Mg, the catalyst exhibits higher p-xylene selectivity (near 100%). Unluckily, the conversion of toluene decreases from 23.3% to about 15% during 50 h reaction on stream. However, the catalyst modified with Pt demonstrated distinct improvement in activity. The conversion of toluene over catalyst loaded 0.3% Pt maintains a constant value of 23% and p-xylene selectivity is a constant 98% during 500 h reaction on stream. For the shape-selective methylation of biphenyl with methanol, after hydrothermal treatment, the catalytic selectivity to 4,4′-DMBP is up to 70%, while the 4-MBP conversion is about 12%. For the shape-selective methylation of naphthalene with methanol, the comprehensive modification of NH 4 F and SrO leads to an increase in the 2, 6-DMN selectivity (2, 6-DMN to DMN), up to 64.8% when 2-MN conversion is 10%. However, for the shape selective methylation of poly-aromatics, Pt modification can not improve the stability due to the isomerization of reactants.

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