الفهرس | Only 14 pages are availabe for public view |
Abstract A series of dealuminated zeoliteY-supported platinum was prepared adopting two dealumination methods, viz. fast (1, 3 and 6h) and slow (18 h) methods. The content of Pt was kept constant at 0.5 wt % in all investigated catalyst using witness impregnation method. The most active and suitable catalysts for isomerization process was 0.5 % Pt/ D18H-Y where the parent Y-zolite dealuminated using slow method for 18 h. This catalyst was loaded by two different amounts of Ni, Pd or Cr (0.3 and 0.6 wt%) by sequential impregnation technique. The prepared samples were characterized using TGA/DSC, XRD, FTIR techniques, Nitrogen adsorption at -196°C and TEMconnected with energy dispersive X-ray analysis (EDX). Surface acidity was investigated via pyridine adsorption using FTIR spectroscopy. Two types of catalytic tests were used. The first type of measurement was tested by the hydroconversion of n-hexane and n-heptane as model compounds using a micro-catalytic pulse technique attached to a gas chromatograph. The second type was focused on studying the effect of important process variables on the extent of isomerization of naptha, and upgrading of kerosene, on the selected screened catalyst using continues flow fixed bed atmospheric and high pressure unit. The parent and dealuminated Y- zeolite samples were characterized by their microporous system. |