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Extraction of Valuable Metals From Spent Hydrodesulfurization Catalyst By Two Stage Leaching Method

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Abstract

Spent hydrodesulfurization (Co-Mo/γ-Al2O3) catalyst generally contains valuable metals like molybdenum (Mo), cobalt (Co), aluminium (Al) on a supporting material, such as γ-Al2O3. In the present study, a two stages alkali/acid leaching process was conducted to study leaching of cobalt, molybdenum and aluminium from Co-Mo/γ-Al2O3 catalyst. The acid leaching of spent catalyst, previously treated by alkali solution to remove molybdenum, yielded a solution rich in cobalt and aluminium.


Article
Comparative Study of New Re-Ni-Mo/Al2o3 and Conventional Hydrodesulphurization Catalyst

Authors: Tariq M. Naife --- Hussein Q. Hussein --- Abdul Halim A. Karim Mohammed
Journal: Iraqi Journal of Chemical and Petroleum Engineering المجلة العراقية للهندسة الكيمياوية وهندسة النفط ISSN: 19974884/E26180707 Year: 2015 Volume: 16 Issue: 4 Pages: 1-9
Publisher: Baghdad University جامعة بغداد

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Abstract

New types of hydrodesulfurization (HDS) catalyst Re-Ni-Mo/ γ-Al2O3 was prepared and tested separately with two prepared conventional HDS catalysts (Ni-Mo/ γ-Al2O3 and Co-Mo//γ-Al2O3) by using a pilot plant hydrotreatment unit. Activities of three prepared hydrodesulfurization catalysts were examined in hydrodesulfurization (HDS) of atmospheric gas oil at different temperatures 275 to 350 °C and LHSV 1 to 4 h-1, the reactions conducted under constant pressure 40 bar and H2/HC ratio 500 ml/ml .Moreover, the hydrogenation of aromatic (HAD) in gas oil has been studied. HDS was much improved by adding promoter Re to the Ni-Mo/Al2O3 catalyst. The results showed that Re-Ni-Mo/ γ-Al2O3 have more activity in desulfurization than Ni-Mo//γ-Al2O3 and Co-Mo/ γ-Al2O3 catalysts. The efficiency of hydrodesulfurization was markedly reduced over the Co -Mo/ γ-Al2O3.Also the result showed that Ni-Mo//γ-Al2O3 have a minimum aromatic content 15.44 %.


Article
Adsorption Study of Hydrodesulphurization Catalyst

Author: Tariq M.Naife
Journal: Journal of Engineering مجلة الهندسة ISSN: 17264073 25203339 Year: 2012 Volume: 18 Issue: 1 Pages: 38-50
Publisher: Baghdad University جامعة بغداد

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Abstract

Physical and chemical adsorption analyses were carried out by nitrogen gas using ASTM apparatus at 77 Kand hydrogen gas using volumetric apparatus at room temperature respectively. These analyses were used fordetermination the effect of coke deposition and poisoning metal on surface area, pore size distribution andmetal surface area of fresh and spent hydrodesulphurization catalyst Co-MoAl2O3 .Samples of catalyst (fresh and spent) used in this study are taken from AL-Dura refinery.The results of physical adsorption shows that surface area of spent catalyst reduced to third compare withfresh catalyst and these catalysts exhibit behavior of type four according to BET classification ,so, the poresof these samples are cylindrical, and the pores of fresh catalyst suffers during the hydrodesulphurization .The result of chemical adsorption shows that the metal surface area of fresh catalyst is 50.72 m2/g while itreduced to 39.04 m2/g for spent catalyst.

تم اجراء تحاليل الامتزاز الفيزياوي والكيمياوي باستعمال غاز النتروجين وبواسطة جهاز ASTM وبدرجة حرارة 77 K،وباستعمال غاز الهيدروجين بواسطة منظومة حجمية للامتزاز وبدرجة حرارة الغرفة على التوالي، هذه التحاليل تستعمل لحساب تاثير المواد الكاربونية والسمية على المساحة السطحية وحجم التوزيع المسامي والمساحة السطحية للمعدن للعامل المساعد Co-MoAl2O3 الطازج والمستهلك المستعمل في عملية إزالة الكبريت . جميع نماذج العامل المساعد (الطازجة والمستهلكة) تم أخذها من مصفى الدورة .تبين النتائج المستحصلة لعملية الامتزاز الفيزياوي بان قيمة المساحة السطحية للعامل المساعد المستهلك قلت للثلث مقارنة بالعامل المساعد الطازج وإن هذه العوامل المساعدة أظهرت النمط الرابع وفقا لتصنيف BET لمتساويات درجة الحرارة للامتزاز ،لذا فان مسامات هذه المواد هي من النوع الاسطواني.وقد عانى العامل المساعد الطازج نتيجة الاستخدام إلى فقدان الكثير من مساميته ومساحته السطحية بسبب عملية السلفرة الهيدروجينية .أظهرت نتائج الامتزاز الكيمياوي إلى ان المساحة السطحية للمعدن الطازج 50.72 م2/غم بينما تقل لتساوي 39.04 م2/غم للعامل المساعد المستهلك .

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