caa a22 4500 463170253 CHVBK 20180406164811.0 cr unu---uuuuu 170326e20070801xx s 000 0 eng 10.1007/s10450-007-9068-7 doi (NATIONALLICENCE)springer-10.1007/s10450-007-9068-7 Preparation of MCM-41 silica using the cationic surfactant blend [Elektronische Daten] [Arnošt Zukal, Helena Šiklová, Jiří Čejka, Matthias Thommes] A series of samples of MCM-41 silica was synthesized using surfactant blends of 1-alkyl-3-methylimidazolium and alkyltrimethylammonium salts or blends of two different 1-alkyl-3-methylimidazolium salts (alkyl denotes octyl or hexadecyl) as structure-directing agents. The precipitation of solid particles from a homogeneous water solution of sodium metasilicate and surfactant blend was achieved by lowering the pH due to the hydrolysis of ethyl acetate added. The molecular sieves were characterized by scanning as well as transmission electron microscopy, X-ray powder diffraction, and nitrogen adsorption using a proper nonlocal density functional theory approach for calculations of the textural parameters. All the prepared silicas were of MCM-41-type; they differ in the integral breadth of the pore size distribution curve and the presence of secondary mesopores. The best quality MCM-41 silica of spherical particle morphology was synthesized by using of optimized blend of hexadecyltrimethylammonium bromide and 1-methyl-3-octylimidazolium chloride. The results obtained showed that spherical particles are composed of domains of perfectly ordered hexagonal porous structure. Some samples prepared by using 1-alkyl-3-methylimidazolium salts featured a narrow pore size distribution. However, they contained a small volume of secondary mesopores. Springer Science+Business Media, LLC, 2007 Mesoporous molecular sieves nationallicence Synthesis and characterization nationallicence Nitrogen adsorption isotherms nationallicence S BET : BET surface area, m2/g nationallicence S ME : cumulative mesopore area, m2/g nationallicence V ME : cumulative mesopore volume, cm3/g nationallicence D ME : mesopore mode diameter, nm nationallicence Δ D ME : integral breadth of the mesopore distribution curve, nm nationallicence V SEC : volume of secondary mesopores, cm3/g nationallicence V TOT : total pore volume, cm3/g nationallicence W ME : mesopore size calculated using equation (1), nm nationallicence Zukal Arnošt J. Heyrovský Institute of Physical Chemistry, v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 3, 182 23, Prague 8, Czech Republic aut Šiklová Helena J. Heyrovský Institute of Physical Chemistry, v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 3, 182 23, Prague 8, Czech Republic aut Čejka Jiří J. Heyrovský Institute of Physical Chemistry, v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 3, 182 23, Prague 8, Czech Republic aut Thommes Matthias Quantachrome Instruments, 1900 Corporate Drive, 33426, Boynton Beach, Florida, USA aut Adsorption Springer US; http://www.springer-ny.com 13/3-4(2007-08-01), 247-256 0929-5607 13:3-4<247 2007 13 10450 https://doi.org/10.1007/s10450-007-9068-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10450-007-9068-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zukal Arnošt J. Heyrovský Institute of Physical Chemistry, v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 3, 182 23, Prague 8, Czech Republic aut NATIONALLICENCE 700 1- Šiklová Helena J. Heyrovský Institute of Physical Chemistry, v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 3, 182 23, Prague 8, Czech Republic aut NATIONALLICENCE 700 1- Čejka Jiří J. Heyrovský Institute of Physical Chemistry, v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 3, 182 23, Prague 8, Czech Republic aut NATIONALLICENCE 700 1- Thommes Matthias Quantachrome Instruments, 1900 Corporate Drive, 33426, Boynton Beach, Florida, USA aut NATIONALLICENCE 773 0- Adsorption Springer US; http://www.springer-ny.com 13/3-4(2007-08-01), 247-256 0929-5607 13:3-4<247 2007 13 10450 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer