CCI4 chlorinated alumina

Four nonmetallic additives are to be mentioned here sulfur and chlorine are added intentionally to influence catalyst activity, hydrogen is always present in commercial reforming, and carbon accumulates as a result of a side reaction producing polymeric coke on metallic and acidic sites (72). Chlorine ( 1%) is added to alumina to ensure proper acidic properties to promote bifunctional mechanism (2,4,72). The presence of Cl slowed down catalyst deactivation and accentuated metal-support interaction (73). It could also suppress hydrogenolysis activity of commercial reforming catalyst. At the same time, carbon accumulated from CCI4 added to the reformer stream to ensure the steady Cl content of reforming... 

The adsoiption of CCI4 on the supports prepared was studied to get an indication of the acidity of the surface. The amounts of CCI4 adsorbed are plotted in Figures 8 and 9. The results show two different trends for the two systems in ahunina-titania as the amount of titania increases the amount adsorbed increases vsdiile for the alumina-zirconia sanq>les the result is the opposite. In fact the chlorine retained by the sanq>les with titania are higher than that observed on an alumina single oxide support used as reference. In the case of the Zr-modified aluminas the weight increase in the alumina referoice lies between the S% and 10% ZrOj-AljOj san les. 

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