Catalytic properties and acidity of modified MCM-41 mesoporous materials with low Si/Al ratio: Heptane isomerisation

被引：0
|
作者：
Belhakem, Ahmed
Bengueddach, Abdelkader
机构：
[1] Lab SEA, Mostaganem 27000, Algeria
[2] U es Senia, Lab Chim Mat, Oran, Algeria
来源：
BULLETIN OF THE CHEMICAL SOCIETY OF ETHIOPIA | 2006年 / 20卷 / 01期
关键词：
MCM-41; materials; catalytic properties; acid strength; heptane isomerisation;
D O I：
暂无
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The catalytic properties and acidity of modified MCM-41 with a low Si/Al ratio and 0-95% NH4+ exchange were investigated. The samples were characterised by X-ray diffraction, scanning and transmission electron microscopy, and nitrogen adsorption. The acidity was studied by pyridine adsorption, temperature programmed desorption (TPD) of ammonia and infrared (IR) spectroscopy. Adsorption of pyridine and IR spectroscopy indicated various types of Lewis and Bronsted acid sites. The density distribution of acid sites was determined by TPD. Both Lewis and Bronsted acid sites were found to be active in the heptane isomerisation. The presence of aluminium (low Si/Al) combined to the ionic exchange between Na+ and NH4+ increases the acidity of MCM-41 materials. A close correlation between acidity and isomerisation was observed. Coke deposition, which reduces the activity, was also studied.
引用
收藏
页码：99 / 112
页数：14
相关论文
共 50 条
  • [41] Determination of the acidity of MCM-41 with different Si/Al ratios by the temperature programmed desorption of pyridine
    Souza, Marcelo J. B.
    Lima, Stevie H.
    Araujo, Antonio S.
    Garrido Pedrosa, Anne M.
    Coutinho, Ana C. S. L. S.
    ADSORPTION SCIENCE & TECHNOLOGY, 2007, 25 (10) : 751 - 756
  • [42] Synthesis and characterization of mesoporous molecular sieves MCM-41 modified in framework by B and Al
    Zhou, Chun-Hui
    Zhang, Bo
    Li, Qing-Wei
    Cai, Ye
    Chen, Yin-Fei
    Ge, Zhong-Hua
    Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities, 2001, 15 (05): : 425 - 428
  • [43] Ethylene polymerisation with zirconocene supported in Al-modified MCM-41:: Catalytic behaviour and polymer properties
    Campos, Joao M.
    Ribeiro, M. Rosario
    Lourenco, Joao Paulo
    Fernandes, Auguste
    JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL, 2007, 277 (1-2) : 93 - 101
  • [44] Dry-gel synthesis of mesoporous MCM-41 materials with modified pore structure
    Xu, MC
    Wang, W
    Weitkamp, J
    Hunger, M
    ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS, 2005, 219 (07): : 877 - 890
  • [45] Isomerization and Dimerization of Pinene using Al-Incorporated MCM-41 Mesoporous Materials
    Zou, Ji-Jun
    Chang, Na
    Zhang, Xiangwen
    Wang, Li
    CHEMCATCHEM, 2012, 4 (09) : 1289 - 1297
  • [46] Synthesis, characterization and catalytic performance of Al-MCM-41 mesoporous materials
    Gonzalez, F.
    Pesquera, C.
    Perdigon, A.
    Blanco, C.
    APPLIED SURFACE SCIENCE, 2009, 255 (17) : 7825 - 7830
  • [47] Structural and catalytic properties of Mn oxo-clusters supported on mesoporous MCM-41
    Gleeson, D
    Burch, R
    Cruise, NA
    Tsang, SC
    NANOSTRUCTURED MATERIALS, 1999, 12 (5-8): : 1007 - 1010
  • [48] Catalytic properties of heteropolyacids supported on MCM-41 mesoporous silica for hydrocarbon cracking reactions
    Beltramini, JN
    NANOTECHNOLOGY IN MESOSTRUCTURED MATERIALS, 2003, 146 : 653 - 656
  • [49] Synthesis and characterization of MCM-41 with different pore size and Si/Al-ratio
    Matthae, FP
    Genske, D
    Minchev, C
    Lechert, H
    MESOPOROUS MOLECULAR SIEVES 1998, 1998, 117 : 223 - 230
  • [50] Synthesis, characterization, and catalytic properties of mesoporous tin-containing analogs of MCM-41
    Chaudhari, K
    Das, TK
    Rajmohanan, PR
    Lazar, K
    Sivasanker, S
    Chandwadkar, AJ
    JOURNAL OF CATALYSIS, 1999, 183 (02) : 281 - 291
12345