Narrowing the mesopore size distribution in hierarchical TS-1 zeolite by surfactant-assisted reorganization

2014 ◽  
Vol 189 ◽  
pp. 71-82 ◽  
Author(s):  
D.P. Serrano ◽  
R. Sanz ◽  
P. Pizarro ◽  
I. Moreno ◽  
S. Shami
Keyword(s):  
Size Distribution ◽  
Mesopore Size Distribution ◽  
Surfactant Assisted

Dehydrogenation of Propane to Propene over Mesoporous ZrO2-Supported VCrO Catalysts

2014 ◽  
Vol 1008-1009 ◽  
pp. 290-294
Author(s):  
Bao Agula ◽  
Si Qin Dalai ◽  
Yue Chao Wu
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Mesoporous Structure ◽  
Molar Ratio ◽  
Impregnation Method ◽  
Size Distributions ◽  
Tem Analysis ◽  
Surfactant Assisted ◽  
Uniform Pore Size

Mesoporous ZrO2with narrow mesopore size distributions has been prepared by the surfactant-assisted method of nanoparticle assembly. A series of VCrO/ZrO2catalysts with different V/Cr molar ratio (0.3, 0.6, 1.0, 1.3 and 1.6) were prepared by the wetness impregnation method and characterized by XRD, N2adsorption and TEM techniques. N2adsorption and TEM analysis revealed that the surfactant-assisted method prepared VCrO/ZrO2catalysts have wormhole-like mesoporous structure with uniform pore size distribution. VCrO/ZrO2catalysts have been applied for direct dehydrogenation of propane to propene. The optimistic catalyst was V/Cr-0.6 with highest yield of 41.7% the corresponding conversion of propane was 44.1% and selectivity to propene was 94.5% at 550 °C.

Preparation of Mesoporous Si–C–O Fibers with a Narrow Mesopore Size Distribution

2013 ◽  
Vol 13 (3) ◽  
pp. 2272-2275
Author(s):  
Chengyong Li ◽  
Rongan He ◽  
Shiying Zhang ◽  
Jingyu Liu ◽  
Ning Yang
Keyword(s):  
Size Distribution ◽  
Mesopore Size Distribution

scholarly journals Surfactant-Assisted Sol-Gel Synthesis of TiO2 with Uniform Particle Size Distribution

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
O. L. Galkina ◽  
V. V. Vinogradov ◽  
A. V. Agafonov ◽  
A. V. Vinogradov
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Sol Gel ◽  
Active Surface ◽  
Titanium Isopropoxide ◽  
Active Surface Area ◽  
Vis Spectroscopy ◽  
Uniform Particle Size ◽  
Surfactant Assisted

TiO2 materials were prepared from a titanium isopropoxide precursor by sol-gel processing in water media with or without various templates (polyethylenimine or Pluronic P-123). The photocatalytic efficiency of the samples was found to depend strongly on the use of and type of template added. Titania/Pluronic sols resulted in homogeneous anatase TiO2—rutile with uniform particle size distribution after calcination (400°C). Optical properties of the samples were characterized by UV-Vis spectroscopy and crystalline structures by X-ray diffraction. A surfactant-assisted sol-gel process retarded crystallization of the anatase and rutile titania, which resulted in smaller grain sizes and presumably a larger active surface area. The morphology of the surfaces was obtained by AFM techniques. The highest photobleaching rate was found for samples deposited from the sol with the addition of the Pluronic P-123 surfactant, and it was almost twice as high as that for films deposited from sols with polyethylenimine.

Possibilities of determining the polymodal pore-size distribution from physical adsorption of nitrogen

1987 ◽  
Vol 52 (5) ◽  
pp. 1160-1166
Author(s):  
Dagmar Tomanová ◽  
Petr Schneider
Keyword(s):  
Pore Size ◽  
Size Distribution ◽  
Physical Adsorption ◽  
Relative Pressure ◽  
Size Distributions ◽  
Porous Sample ◽  
Fine Grained ◽  
Mesopore Size Distribution ◽  
Pore Size Distributions ◽  
Adsorption Of Nitrogen

It is shown, on the basis of experimentally determined adsorption isotherms of physical adsorption of nitrogen on two- and three-component mixtures of fine grained porous glasses with narrow pore-size distributions, that the polymodal mesopore-size distribution curves can be evaluated in case that the porous sample contains groups of mesopores differing rather significantly in size. The differentiation of groups of pores gets worse with wider pores where the demands on the accuracy of the relative pressure measurement grow stronger.

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