Shape-selective methylation of 2-methynaphthalene to 2,6-dimethylnaphthalene over modified HZSM-5 zeolite catalysts

Chen Zhang, Xinwen Guo, Chunshan Song

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Shape-selective alkylation of polycyclic hydrocarbons has been the focus of many recent studies1-5 for preparation of symmetric intermediates such as 2,6-dialkylnaphthalene (2,6-DAN) which are used for synthesizing advanced polymer materials. Among 2,6-DANs, 2,6-dimethylnaphthalene (DMN) is regarded as the most suitable desirable intermediate with which can be oxidized with high selectivity reactivity in process of oxidation into 2,6-naphthalenedicarboxylic acid (2,6-NDCA), a monomor for aromatic polyester materials.Therefore, effective synthesis of 2,6-DMN has been become an important subjectstudied extensively.In this work, we compared the effects of potassium and phosphorus modification on the selectivity and activity of ZSM-5 for the methylation of 2-MN with methnol, and identified the promising direction for modification towards increasing the ratio of 2,6/2,7-DMN. Furthermore, we aimed to clarify the reason why the modified HZSM-5 zeolites exhibit higher selectivity for the methylation of 2-MN.Over KZSM-5(1.0), selectivity of DMN and 2,6-DMN were 72.8% and 54.1% respectively. Especially, at 6th hr of TOS, the selectivity to 2,6-DMN reached to 58%. The yield of 2,6-DMN was around 9.0% which is one of the best results as we know according to the literature.P and K modification showed totally opposite impact on ratio of 2,6/2,7-DMN for different effct on the acid properties of HZSM-5.

Original languageEnglish (US)
Title of host publicationAmerican Chemical Society - 238th National Meeting and Exposition, ACS 2009, Abstracts of Scientific Papers
StatePublished - Dec 1 2009
Event238th National Meeting and Exposition of the American Chemical Society, ACS 2009 - Washington, DC, United States
Duration: Aug 16 2009Aug 20 2009

Publication series

NameACS National Meeting Book of Abstracts
ISSN (Print)0065-7727

Other

Other238th National Meeting and Exposition of the American Chemical Society, ACS 2009
CountryUnited States
CityWashington, DC
Period8/16/098/20/09

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

Fingerprint Dive into the research topics of 'Shape-selective methylation of 2-methynaphthalene to 2,6-dimethylnaphthalene over modified HZSM-5 zeolite catalysts'. Together they form a unique fingerprint.

Cite this