Methylation of 2-methylnaphthalene over metal-impregnated mesoporous MCM-41 for the synthesis of 2,6-triad dimethylnaphthalene isomers

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Niftaliyeva A., Gulec F., KARADUMAN A.

RESEARCH ON CHEMICAL INTERMEDIATES, cilt.46, sa.4, ss.2403-2416, 2020 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 46 Sayı: 4
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1007/s11164-020-04098-8
  • Dergi Adı: RESEARCH ON CHEMICAL INTERMEDIATES
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Chimica, Compendex, Environment Index
  • Sayfa Sayıları: ss.2403-2416
  • Anahtar Kelimeler: Methylation, 2-Methylnaphthalene, 2, 6-Dimethylnaphthalene, 2, 6-Triad DMN, MCM-41, PEN, SHAPE-SELECTIVE METHYLATION, CATALYTIC PERFORMANCE, ZEOLITE CATALYSTS, EFFICIENT CATALYST, N-ALKYLATION, 2,6-DIMETHYLNAPHTHALENE, METHANOL, ISOMERIZATION, TEMPERATURE, ADSORPTION
  • Ankara Üniversitesi Adresli: Evet

Özet

2,6-Dimethylnaphthalene (2,6-DMN) is one of the key intermediates for the production of polyethylene naphthalate (PEN), which demonstrates superior properties compared with the polyethylene terephthalate. However, the complex synthesis procedure of 2,6-DMN increases the production cost and decreases the commercialisation of PEN. In this study, selective synthesis of 2,6-triad DMN isomers (1,5-DMN, 1,6-DMN and 2,6-DMN) has been investigated by the methylation of 2-methylnaphthalene (2-MN) over mesoporous Cu/MCM-41 and Zr/MCM-41 zeolite catalysts. On the contrary of other DMN isomers, 2.6-triad isomers can effectively be converted to be profitable 2,6-DMN with an additional isomerisation reaction, which is a new approach to reach higher 2,6-DMN yield. The methylation reactions of 2-MN were investigated in a fixed-bed reactor at 400 degrees C and weight hourly space velocity of 1-3 h(-1). The results showed that the activity of MCM-41 on the methylation of 2-MN has been enhanced with the impregnation of Cu. The conversion increased from about 17% to 35 wt% with the impregnation of Cu. Similarly, the 2,6-triad DMN selectivity and 2,6-/2,7-DMN ratio reached the maximum level (48 wt% and 1.95, respectively) over Cu-impregnated MCM-41 zeolite catalyst.