Improved synthesis of alumina-pillared montmorillonite by surfactant modification

1992 ◽  
Vol 4 (6) ◽  
pp. 1433-1437 ◽  
Author(s):  
Laurent J. Michot ◽  
Thomas J. Pinnavaia
Keyword(s):  
Pillared Montmorillonite ◽  
Surfactant Modification

TEM observation of iron oxide pillars in montmorillonite

1990 ◽  
Vol 48 (4) ◽  
pp. 882-883
Author(s):  
H. Mori ◽  
Y. Murata ◽  
H. Yoneyama ◽  
H. Fujita
Keyword(s):  
Aqueous Solution ◽  
Iron Oxide ◽  
Fine Particles ◽  
Aqueous Suspension ◽  
Volume Ratio ◽  
Exchange Capacity ◽  
Nano Composites ◽  
Pillared Montmorillonite ◽  
Topographic Features ◽  
Transmission Electron

Recently, a new sort of nano-composites has been prepared by incorporating such fine particles as metal oxide microcrystallites and organic polymers into the interlayer space of montmorillonite. Owing to their extremely large specific surface area, the nano-composites are finding wide application[1∼3]. However, the topographic features of the microstructures have not been elucidated as yet In the present work, the microstructures of iron oxide-pillared montmorillonite have been investigated by high-resolution transmission electron microscopy.Iron oxide-pillared montmorillonite was prepared through the procedure essentially the same as that reported by Yamanaka et al. Firstly, 0.125 M aqueous solution of trinuclear acetato-hydroxo iron(III) nitrate, [Fe3(OCOCH3)7 OH.2H2O]NO3, was prepared and then the solution was mixed with an aqueous suspension of 1 wt% clay by continuously stirring at 308 K. The final volume ratio of the latter aqueous solution to the former was 0.4. The clay used was sodium montmorillonite (Kunimine Industrial Co.), having a cation exchange capacity of 100 mequiv/100g. The montmorillonite in the mixed suspension was then centrifuged, followed by washing with deionized water. The washed samples were spread on glass plates, air dried, and then annealed at 673 K for 72 ks in air. The resultant film products were approximately 20 μm in thickness and brown in color.

scholarly journals Synthesis of the Pillared Montmorillonite with Different Pillar Distribution and Its Catalytic Property.

1991 ◽  
pp. 1050-1058
Author(s):  
Masakazu HORIO ◽  
Kenzi SUZUKI ◽  
Hiroyuki MASUDA ◽  
Toshiaki MORI
Keyword(s):  
Catalytic Property ◽  
Pillared Montmorillonite

Al-pillared montmorillonite clay minerals: Low-pressure CO adsorption at room temperature

2007 ◽  
Vol 313 (2) ◽  
pp. 747-750 ◽  
Author(s):  
Atsushi Itadani ◽  
Masashi Tanaka ◽  
Takahiro Abe ◽  
Hideki Taguchi ◽  
Mahiko Nagao
Keyword(s):  
Clay Minerals ◽  
Room Temperature ◽  
Co Adsorption ◽  
Low Pressure ◽  
Montmorillonite Clay ◽  
Pillared Montmorillonite

Vanadium-doped titania-pillared montmorillonite clay as a catalyst for selective catalytic reduction of NO by ammonia

Clay Minerals ◽  
1997 ◽  
Vol 32 (4) ◽  
pp. 665-672 ◽  
Author(s):  
K. Bahranowski ◽  
J. Janas ◽  
T. Machej ◽  
E. M. Serwicka ◽  
L. A. Vartikian
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Catalytic Performance ◽  
Pillared Clay ◽  
Area Measurement ◽  
Bet Surface Area ◽  
X Ray Diffraction ◽  
Reduction Of No ◽  
Pillared Montmorillonite ◽  
Doped Titania

AbstractA series of V-doped titania-pillared clay catalysts, characterized by ICP-AES chemical analysis, X-ray diffraction, BET surface area measurement, and ESR spectroscopy, have been tested in the selective catalytic reduction of NO by NH3. An ESR analysis shows that V dopant is anchored to the titania pillars. Vanadyl species with differing degrees of in-plane V-O π-covalent bonding are produced depending on the method of sample preparation. Polymeric V species appear as the V content is increased. Catalytic performance of these systems depends on the method of preparation and on the V content. The best catalyst, converting 90-100% NO in the temperature range 523-623 K, is obtained by exchange of pillared montmorillonite with vanadyl ions, at an extent of exchange below the level where significant amounts of polymeric V species appear. The co-pillared catalyst, containing vanadyl centres characterized by a higher degree of in-plane ncovalent bonding (according to ESR), is less selective than the exchanged samples.

Hierarchical porous nano-MFI zeolite-pillared montmorillonite clay synthesized by recrystallization for hydrocracking of residual oil

RSC Advances ◽  
2015 ◽  
Vol 5 (57) ◽  
pp. 46104-46108 ◽  
Author(s):  
Zhiming Ren ◽  
Baoshan Li ◽  
Liwen Yue ◽  
Naijin Wu ◽  
Kaixuan Lv ◽  
...  
Keyword(s):  
Hierarchical Structure ◽  
Montmorillonite Clay ◽  
Residual Oil ◽  
Mfi Zeolite ◽  
Pillared Montmorillonite ◽  
Hierarchical Porous

An MFI zeolite nanosheet-pillared montmorillonite clay (MPC) with a uniform hierarchical structure was synthesized by a recrystallization method.

Gallium, aluminium and mixed gallium-aluminium pillared montmorillonite

1991 ◽  
Vol 77 (2) ◽  
pp. 303-314 ◽  
Author(s):  
Antonio Vieira Coelho ◽  
Georges Poncelet
Keyword(s):  
Pillared Montmorillonite

Study on the Preparation and Amplification Experiment of Al-Pillared Montmorillonite

2011 ◽  
Vol 396-398 ◽  
pp. 1440-1445
Author(s):  
Gang Chen ◽  
Chun Jie Yan ◽  
Jin Feng Shou ◽  
Juan Mei ◽  
Nan Nan Chen
Keyword(s):  
Pilot Scale ◽  
Micropore Volume ◽  
Bet Surface Area ◽  
Scale Production ◽  
Mass Ratio ◽  
Optimum Conditions ◽  
Technical Parameters ◽  
Pillared Montmorillonite ◽  
Commercial Aluminium ◽  
Major Factors

A method of preparation and pilot scale production of Al-pillared montmorillonite has been developed. There is a minimum of time and amount of liquid. And it is simpler to operate than the conventional method of pillaring by using the commercial aluminium hydroxychloride(PAC) powder as the pillaring agent. Here, the effect of the major factors such as the mass ratio of PAC to montmorillonite, the concentration of montmorillonite slurry, the sodium agent pretreatment, washing times and drying temperature on the Al-pillared montmorillonite are studied. Then the optimal technical parameters is determined. XRD, BET surface area and micropore volume are applied in order to study the structure and properties of Al-pillared montmorillonite. As a result, the amplification experiment under the optimum conditions shows that this method offers the potential for extension to an industrial-scale process.

Cobalt impregnated pillared montmorillonite in the peroxymonosulfate induced catalytic oxidation of tartrazine

2018 ◽  
Vol 125 (2) ◽  
pp. 827-841 ◽  
Author(s):  
Marija Marković ◽  
Sanja Marinović ◽  
Tihana Mudrinić ◽  
Zorica Mojović ◽  
Marija Ajduković ◽  
...  
Keyword(s):  
Catalytic Oxidation ◽  
Pillared Montmorillonite
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