Middle distillate hydrotreatment zeolite catalysts containing Pt/Pd or Ni

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Title: Middle distillate hydrotreatment zeolite catalysts containing Pt/Pd or Ni
Author: Marin-Rosas, Celia
Abstract: A study on middle distillate hydrotreatment zeolite catalysts containing Pt /Pd and /or Ni was performed . The effect of the addition of the corresponding CoMo , CoMoPd , CoMoPtPd and CoMoNi in PdNiPt -zeolite , Pt -zeolite , Ni -zeolite , and PdPt -zeolite was studied . The catalysts were characterized physically and chemically by methods and techniques such as Brunauer -Emmett -Teller (BET ) , Barret -Joyner -Hallenda (BJH ) , and neutron activation analysis . The structures of the Ni and Pt containing zeolite were studied by X -ray Photoelectron Spectroscopy (XPS ) . An experimental apparatus was constructed to investigate the activity of the experimental catalysts . The catalysts activity measured in terms of conversion of dibenzothiophene (DBT ) , substituted dibenzothiophenes (sDBT ) and phenanthrene as well as molar -averaged conversion was evaluated in a continuous flow Robinson Mahoney reactor with stationary basket in the hydrodesulfurization and hydrogenation of heavy gas oil which contains sulphur refractory compounds such as 4 - methyldibenzotiophene (4 -MDBT ) and 4 ,6 - dimethyldibenzothiophene (4 ,6 -DMDBT ) . DBT , 4 -MDBT , 3 -MDBT , 1 -EDBT , 3 -EDBT , 4 ,6 -DMDBT , 3 ,6 -DMDBT , 2 ,8 - DMDBT and 4 -methylnaphtho[2 ,1 -b]thiophene were selected to calculate the molaraveraged conversion . The conversions of the sulfur containing compounds and phenanthrene were determined as a function of the operating variables : space time (W /Fo DBT ) , temperature , H2 /HC mol ratio and pressure . The Conversions of DBT and 4 ,6 -DMDBT into their reaction products such as Biphenyl (BPH ) , Cyclohexylbenzene (CHB ) , Bicyclohexyl (BCH ) and 3 ,4 -Dimethylbiyphenyl (3 ,4 -DMBPH ) were determined only as a function of space time in the interval of 4000 -6000 kgcath /kmol . The results of this work showed that Pt -HY and PdPt -HY are good noble metals catalysts for the hydrodesulfurization of heavy gas oil . Moreover , this study showed that CoMoPd /Pt -HY and CoMoNi /PdPt -HY catalysts are good candidates for deep HDS and hydrogenation of heavy gas oil . It was found that the conversions of sulfur compounds were higher than the conversions provided by the conventional CoMo /Al2O3 catalyst . Also higher hydrogenation of phenanthrene was observed . Deactivation of the catalysts was not observed during the operation . Finally , the study not only contributed to define the technical bases for the preparation of the noble metal catalysts for hydrodesulfurization of heavy gas oil at pilot scale , but also provided technical information for developing the kinetic modeling of the hydrodesulfurization of heavy gas oil with the noble metal catalysts .
URI: http : / /hdl .handle .net /1969 .1 /ETD -TAMU -1066
Date: 2009-05-15

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Middle distillate hydrotreatment zeolite catalysts containing Pt/Pd or Ni. Available electronically from http : / /hdl .handle .net /1969 .1 /ETD -TAMU -1066 .

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