Document Details

Document Type : Thesis 
Document Title :
CARBON DIOXIDE VALORIZATION TO LIGHT OLEFINS USING BI-FUNCTIONAL CATALYST
تحويل ثاني أكسيد الكربون الى اولفينات خفيفة بواسطه المحفزات ثنائية الوظيفة
 
Subject : Faculty of Engineering 
Document Language : Arabic 
Abstract : Carbon dioxide (CO2) concentration in the atmosphere has been increasing since the start of the industrial revolution. Several efforts were expended to minimize the emissions of CO2 or utilize it efficiently. In order to convert CO2 into hydrocarbons, two main routes can be used for this purpose, the modified Fischer-Tropsch route and the methanol route. The modified Fischer-Tropsch route converts CO2 into CO, then CO is converted into hydrocarbons. The methanol route converts CO2 to methanol and then methanol is converted into hydrocarbons. In the literature, it was found that InxOx-ZrxOx/SAPO-34 is considered as a promising catalyst for the conversion of CO2 into hydrocarbons through the methanol route. However, this catalyst has low CO2 conversion and high CO selectivity. Therefore, this catalyst was synthesized with iron-based components to maximize CO2 total conversion and minimize CO selectivity which will result in a higher hydrocarbons selectivity. In this study, five main catalysts were developed using different preparation methods. The testing of catalysts was carried out in a fixed bed reactor at a fixed pressure of 25 bar and three different temperatures from 350oC, 400 oC and 450oC. The feed composition is CO2 and H2 with a mole ratio of 25/75 respectively. The results obtained revealed that synthesizing the catalyst with iron oxide through physical mixing increased the CO2 total conversion. In addition, the overall hydrocarbons selectivity was increased significantly, and CO selectivity was decreased by 30%, which highly proposed that most of the produced CO molecules were converted to hydrocarbon successfully through Fischer-Tropsch reaction. In addition, BET-surface area displayed that synthesizing the InxOx-ZrxOx/SAPO-34 with iron oxide resulted in an increase in the adsorption species on the catalyst surface which can explain the high conversion result associated with this catalyst. 
Supervisor : Dr. Abdul Rahim Al Zahrani 
Thesis Type : Master Thesis 
Publishing Year : 1441 AH
2020 AD 
Added Date : Tuesday, June 30, 2020 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
أحمد حميد الرفاعيALREFAEI, Ahmed ResearcherMaster 

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