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Effect of Promoters on the Catalytic Activity of the Iosmerization Catalyst

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Abstract

The crystalline zeolite, namely faujasite type Y with SiO2/Al2O3 mole ratio of 5 was used as raw material for preparation of isomerization catalysts. A 0.5 wt % Pt/HY-zeolite catalyst was prepared by impregnation of the decationized HY-zeolite with chloroplatinic acid. The dectionized HY-zeolite was treated with HCl, HNO3 and HI promoters using different normalities and with different concentrations of Sn, Ni and Ti promoters by impregnation method to obtain acidic and metallic promoters' catalysts, respectively. A 0.5 wt% of Pt was added to above catalysts using impregnation method. Isomerization of n-hexane was carried out at different prepared catalysts. The isomerization temperature varied from 250–325° C over weight hourly space velocity (WHSV) 1.6 h-1. The pressure and hydrogen to feed mole ratio were kept constant at 1bar and 2 mol/mol, respectively.The comparison between the above prepared catalysts shows that the total isomer yield during the process with Sn-Pt /HY- zeolite catalyst was higher than the other catalysts and, reached to 63.95% vol. A 0.5 wt% of W and Zr was added to Sn-Pt/HY-zeolite catalyst by impregnation method to obtain W and Zr co-metal promoters catalysts. Isomerization of n-hexane was investigated using W and Zr co-metal promoters catalyst at the same operating conditions and the yield of isomers reached to 81.14% vol.and 79.07%vol.,respectively.


Article
MODIFIED HZSM-5 AND H-MORDENITE ZEOLITES AS SUPPORTS FOR PLATINUM CATALYST
تحسين الحفازات Pt/HZSM-5 و Pt/HMOR كحامل للحفاز البلاتيني

Author: Dr. Jabir Shanshool جابر شنشول
Journal: AL-NAHRAIN JOURNAL FOR ENGINEERING SCIENCES مجلة النهرين للعلوم الهندسية ISSN: 25219154 / eISSN 25219162 Year: 2008 Volume: 11 Issue: 2 Pages: 270-277
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

Bifunctional Pt/HZSM-5 and Pt/HMOR catalysts were prepared and applied to the isomerization of n-Hexane. Catalysts containing 0.3wt% Pt on both catalysts with potentially high acidity were prepared by impregnation method. The tested catalysts show that optimum selectivity with maximal isomer yield was obtained for Pt/HZSM-5 catalysts. The nanoparticles were characterized by inductively coupled Plasma (ICP), X-Ray Diffraction (XRD), BET Surface Area, and Transmission Electron Microscopy (TEM). TEM was revealed uniformly dispersed platinum particles on the substrate with average particle size ranging from ~6.893 to 8.847nm. It was demonstrated that the loading content and particle size of the nanoparticles deposited on zeolites could be tuned by changing the weight of precursor and the conditions of loading

تم دراسة فعالية الحفازات ثنائية الاداء , Pt/HZSM-5 و Pt/HMOR في ازمرة الهكسان الاعتيادي. تم تحظير الحفازات بطريقة التشريب ذي محتوى بلاتيني نحو 0.3 % حيث ان كلا الحفازين يتمتعان بحامضية عالية. يتمتع الحفاز نوع Pt/HZSM-5 بفعالية انتقائية اعلى باتجاه الازمرة اعلى من النوع Pt/HMOR. تم تشخيص ودراسة حبيبات البلاتين المحملة على نوعين الزيولايت بالطرق المعروفة Inductively Coupled) Plasma (ICP), X-Ray Diffraction (XRD), BET Surface Area, and Transmission (Electron Microscopy (TEM) فحص ((TEM يشير الى توزيع متجانس لحبيبات البلاتين على الحامل بمعدل قطر يتراوح بين 6.893 – 8.847 نانوميتر. كما تشير الفحوصات الى امكانية السيطرة على محتوى البلاتين وقطر الحبيبات بواسطة اختيار كمية معقد البلاتين المستخدم والظروف التشغيلية.

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