Y zeolit üzerinde dimetilnaftalinlerin üretimine metal yüklemeninve kalsinasyon sıcaklığının etkisi

Abstract

Polyethylene naphthalate (PEN) is a relatively new member of the polyester family. These polymer is a alternative material of polyethylene terephthalate, as well as having a wide usage due to properties such as high oxygen permeability, high heat resistance, young's modulus, high glass transition temperature, low oligomer extraction, and high resistance to radiation. However, 2,6-dimethylnaphthalene (2,6-DMN), which used in the production, can not widespread as necessary on account of the high production costs. Therefore, works in literature, were focused on increasing selectivity of 2,6-DMN and decrease production cost. In this thesis, the effect of metals loading and calcination temperature to the synthesis of dymethylnaphthalenes over Y zeolite are intended. For this purpose, Y zeolite which were available from Zeolyst (USA) company and 10% Cu, La, Ni, and 0.1% Pd, Rb metals doped Y zeolite catalysts were prepared and tested in the methylation and disproportionation of 2-MN. Also, the changes of the products by changing the calcination temperature were investigated over the La/Y zeolite catalyst. In the production of dimethyl naphthalene, 1,3,5-trimethyl benzene were used as a solvent in the methylation of 2-MN with methanol and disproportionation of 2-MN experiments. The obtained reaction liquid products were analyzed by ThermoFinnagan DSQ 250 brand GC-MS device. For characterization of catalysts SEM, XRF, XRD, FTIR and BET analysis were performed.