Gas phase oligomerization of isobutene over acid treated kaolinite clay catalyst

被引:5
作者
Aldhayan D. [1 ]
Aouissi A. [1 ]
机构
[1] Department of Chemistry, King Saud University, P.O. Box 2455, Riyadh
关键词
Clay catalyst; Clean gasoline; Isobutene; Oligomerization; Solid acid catalyst;
D O I
10.9767/bcrec.12.1.758.119-126
中图分类号
学科分类号
摘要
Natural Kaolin Clay was calcined and treated by sulfuric acid. The resulting solid acid catalyst was characterized by FTIR, TGA, and X-ray powder diffraction (XRD) and tested for isobutene oligomerization in a gas phase. The characterization results showed that the acid treated clay underwent chemical and structural transformations. After acid treatment, the Si/Al ratio was increased, and the crystalline raw clay became amorphous. The effects of various parameters such as reaction temperature, reaction time and contact time on isobutene oligomerization were investigated. Catalytic tests showed that isobutene oligomerization led to dimers and trimers as major products. Tetramers were obtained as byproducts. At relatively high reaction temperatures and long contact times, the conversion was enhanced while the selectivity of dimers was decreased in favor of higher oligomers. Copyright © 2017 BCREC GROUP. All rights reserved.
引用
收藏
页码:119 / 126
页数:7
相关论文
共 33 条
[21]  
Belver C., Munoz M.A.B., Vicente M.A., Chemical Activation of a Kaolinite under Acid and Alkaline Conditions, Chem. Mater., 14, pp. 2033-2043, (2002)
[22]  
Fan Y., Wang Q., Yang X., Yao J., Wang G., Synthesis of Didodecyl Carbonate via Transesterification Catalyzed by KF/MgO, Chin. J. Chem. Eng., 17, 5, pp. 883-886, (2009)
[23]  
Vaculikova L., Plevova E., Identification of Clay Minerals and Micas in Sedimentary Rocks, Acta Geodyn. Geomater., 2, pp. 167-175, (2005)
[24]  
Mohsen Q., El-Maghraby A., Characterization and Assessment of Saudi Clay Raw Material at Different Area, Arabian J. Chem., 3, pp. 271-277, (2010)
[25]  
Gasparini E., Tarantino S.C., Ghigna P., Pia Riccardi M., Cedillo-Gonzalez E.I., Siligardi C., Zema M., Thermal Dehydroxylation of Kaolinite under Isothermal Conditions, Appl. Clay Sci., 80, pp. 417-425, (2013)
[26]  
Volzone C., Ortiga J., Removal of Gases by Thermal-Acid Leached Kaolinitic Clays: Influence of Mineralogical Composition, Appl. Clay Sci., 32, pp. 87-93, (2006)
[27]  
Brown G., Brindley G.W., X-Ray Diffraction Procedures for Clay Mineral Identification, Crystal Structures of Clay Minerals and Their X-Ray Identification, pp. 305-359, (1980)
[28]  
Panda A.K., Mishra B.G., Effect of Sulphuric Acid Treatment on the Physico-Chemical Characteristics of Kaolin Clay, Colloid Surface A: Physicochem Eng. Aspects, 363, pp. 98-104, (2010)
[29]  
Sharma M.M., Some Novel Aspects of Cationic Ion-Exchange Resins as Catalysts, React. Funct. Polym., 26, pp. 3-23, (1995)
[30]  
Nkosi B., Ng F.T.T., Rempel G.L., The Oligomerization of 1-Butene using Nay Zeolite Ion-Exchanged with Different Nickel Precursor Salts, Appl. Catal. A, 161, pp. 153-166, (1997)