جامعة الملك عبدالعزيز
جامعة الملك عبدالعزيز
King Abdulaziz University 		مركز النشر العلمي
Center of Scientific Publications

 
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Document Details

Document Type : Article In Conference 
Document Title :
Self-Combustion Synthesis of Nanocrystalline CuO and CuMn2O4 Powders Used as Methanol Synthesis Catalyst for Direct Dimethyl Ether Synthesis from Syngas
Self-Combustion Synthesis of Nanocrystalline CuO and CuMn2O4 Powders Used as Methanol Synthesis Catalyst for Direct Dimethyl Ether Synthesis from Syngas
 
Subject : كيمياء 
Document Language : English 
Abstract : In this study, nanocrystalline powders consisting of CuO and CuMn2O4 have been synthesized by means of a simple combustion synthesis technique using sorbitol as fuel and cupric nitrate and manganese (II) nitrate as oxidant. The starting materials were mixed thoroughly with adding a small amount of ammonia solution and then ignited in the air at 250 °C. It underwent a self-combustion process with a large amount of smoke. The as-synthesized powders were characterized by X-ray diffraction (XRD) analysis, transmission electron microscope (TEM), scanning electron microscope (SEM), surface area measurements, and sinterability. Experimental results revealed that the nanocrystalline powders show high specific surface area and possess small primary crystallite size. Specific surface area and primary crystallite particle size of the powders were ~60 m/g and 10~25 nm, respectively, through the stoichiometric fuel/oxidizer ratio reaction. In addition, the thermal decomposition and combustion process of the reactant mixture were investigated using thermogravimetry (TG) and differential scanning clorimetry (DSC). Nanocrystalline CuO and CuMn2O4 Powders were physically admixed with Y-tpye zeolite methanol dehydration catalyst to form hybrid catalysts. The one-step synthesis of dimethyl ether (DME) from syngas was carried out over the hybrid catalyst under pressurized fixed-bed continuous flow conditions. About 62% CO per-pass conversion and 63% DME selectivity could be achieved under the pressure of 2.0 MPa, the temperature of 260 °C, the ratio H2/CO of 3/2 and the space velocity of 1800 h -1. 
Conference Name : Tenth International Symposium on Heterogeneous Catalysis 
Duration : From : 22/8/1429 AH - To : 26/8/1429 AH
From : 23/8/2008 AD - To : 27/8/2008 AD 
Publishing Year : 1429 AH
2008 AD 
Article Type : Article 
Added Date : Wednesday, February 18, 2009 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
Xiu-Juan TangXiu-Juan TangResearcherDoctorate 
Jin-Hua FeiJin-Hua FeiResearcherDoctorate 
Xiao-Ming ZhengXiao-Ming ZhengResearcherDoctorate 
Hui LouHui LouResearcherDoctorate 

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