Characterization of H3+xPMo12−xVxO40 heteropolyacids supported on HMS mesoporous molecular sieve and their catalytic performance in propene oxidation

2012 ◽  
Vol 154 ◽  
pp. 153-163 ◽  
Author(s):  
Siham Benadji ◽  
Pierre Eloy ◽  
Alexandre Leonard ◽  
Bao–Lian Su ◽  
Chérifa Rabia ◽  
...  
Keyword(s):  
Molecular Sieve ◽  
Catalytic Performance ◽  
Mesoporous Molecular Sieve ◽  
Propene Oxidation

Stability and characterization of mesoporous molecular sieve using natural clay as a raw material obtained by microwave irradiation

2008 ◽  
Vol 254 (15) ◽  
pp. 4797-4802 ◽  
Author(s):  
Tingshun Jiang ◽  
Wei Shen ◽  
Yajing Tang ◽  
Qian Zhao ◽  
Mei Li ◽  
...  
Keyword(s):  
Microwave Irradiation ◽  
Molecular Sieve ◽  
Mesoporous Molecular Sieve ◽  
Raw Material ◽  
Natural Clay

Titanium Containing Aluminophosphate Molecular Sieve for Oxidation of Styrene

2015 ◽  
Vol 1109 ◽  
pp. 360-364 ◽  
Author(s):  
Salasiah Endud ◽  
Nurliana Roslan ◽  
Zainab Ramli ◽  
Hendrik O. Lintang
Keyword(s):  
Hydrogen Peroxide ◽  
Molecular Sieves ◽  
Molecular Sieve ◽  
Catalytic Performance ◽  
Organic Template ◽  
Organic Base ◽  
Styrene Oxidation ◽  
Tetraethylammonium Hydroxide ◽  
Xrd Patterns

Microporous aluminophosphate (AlPO-5) and titanium aluminophosphate (TAPO-5) molecular sieves, which are zeolite-like materials have been synthesized by direct hydrothermal method using two different templates; triethylamine (TEA) as organic base and tetraethylammonium hydroxide (TEAOH) as alkali base. XRD patterns confirmed that the TAPO-5 catalysts are identical with AFI structure but the crystallinity of the catalysts had decreased after the incorporation of titanium into the framework. Besides that, characterization of TAPO-5 catalysts using DRUV-Vis confirmed the coordination of titanium species and this evidenced also supported by the result 27Al MAS NMR. Catalytic performance of the TAPO-5 catalysts was tested in the oxidation of styrene to produce benzaldehyde and phenylacetaldehyde in the presence of hydrogen peroxide as oxidant. TAPO-5 catalysts showed higher activity in styrene oxidation compared to AlPO-5. Keywords: zeolite; aluminophosphate; titanium; organic template; styrene

Synthesis and characterization of mesoporous molecular sieve nanoparticles

2006 ◽  
Vol 15 (1) ◽  
pp. 67-73 ◽  
Author(s):  
Tingshun Jiang ◽  
Lude Lu ◽  
Xujie Yang ◽  
Qian Zhao ◽  
Tao Tao ◽  
...  
Keyword(s):  
Molecular Sieve ◽  
Mesoporous Molecular Sieve ◽  
Synthesis And Characterization

scholarly journals SBA-15 as a Support for Effective Olefin Metathesis Catalysts

Catalysts ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 743 ◽  
Author(s):  
Hynek Balcar ◽  
Jiří Čejka
Keyword(s):  
Olefin Metathesis ◽  
Molecular Sieve ◽  
Catalyst Support ◽  
Mesoporous Structure ◽  
Catalytic Performance ◽  
Mesoporous Molecular Sieve ◽  
Organometallic Complexes ◽  
Tungsten Oxides ◽  
Wide Range ◽  
Metathesis Catalysts

Olefin metathesis is the catalytic transformation of olefinic substrates, finding a wide range of applications in organic synthesis. The mesoporous molecular sieve Santa Barbara Amorphous (SBA-15) has proven to be an excellent support for metathesis catalysts thanks to its regular mesoporous structure, high BET area, and large pore volume. A survey of catalysts consisting of (i) molybdenum and tungsten oxides on SBA-15, and (ii) molybdenum and ruthenium organometallic complexes (Schrock and Grubbs-type carbenes) on SBA-15 is provided together with their characterization and catalytic performance in various metathesis reactions. The comparison with catalysts based on other supports demonstrates the high quality of the mesoporous molecular sieve SBA-15 as an advanced catalyst support.

Synthesis, Physicochemical Properties and Catalytic Performance of a Modified ZSM-5 Molecular Sieve

2011 ◽  
Vol 197-198 ◽  
pp. 1042-1046
Author(s):  
Wei Qiao Liu ◽  
Gong Li ◽  
Hui Juan Tong ◽  
Wei Ning Lei ◽  
Tong Ming Shang ◽  
...  
Keyword(s):  
Molecular Sieve ◽  
Catalytic Performance ◽  
Mesoporous Molecular Sieve ◽  
Acid Sites ◽  
X Ray Diffraction ◽  
Alkyl Benzene ◽  
Carbon Template ◽  
Conventional Process ◽  
Alkylation Of Benzene ◽  
Adsorption Desorption

A modified ZSM-5 molecular sieve was prepared by the combination of recrystallization and carbon template methods. The samples were characterized by X-ray diffraction, N2 adsorption-desorption, NH3-TPD, TEM and SEM. The results show that the modified ZSM-5 molecular sieve has double pore distribution. The diameters of the two kinds of channels are 0.51~0.56 nm and 1.4~1.6 nm, respectively. In addition, the modified HZSM-5 (H-type ZSM-5) sample mainly has moderate strength of acid sites. Finally, the alkylation of benzene with 1-dodecene olefin was used to evaluate the catalytic performance of the as-synthesized modified ZSM-5 on macromolecules. The conversions of 1-dodecene on the modified ZSM-5, ZSM-5 prepared by conventional process and aluminum-containing SBA-15 mesoporous molecular sieve are 96%, 39% and 83%, respectively. And the selectivities of long chain alkyl benzene on those are 97%, 68% and 91%, respectively. The catalytic properties of the modified ZSM-5 on macromolecules are superior to those of ZSM-5 prepared by conventional process and aluminum-containing SBA-15 mesoporous molecular sieve.

PREPARATION AND CHARACTERIZATION OF SiO2 NANOPARTICLE AND MESOPOROUS SILICATE MOLECULAR SIEVE MCM-48

2002 ◽  
Vol 01 (05n06) ◽  
pp. 539-543
Author(s):  
KYUNG WON SEO ◽  
SUNG DU MOON ◽  
YOUNG SOO KANG ◽  
YONG JOO KIM
Keyword(s):  
Particle Size ◽  
Molecular Sieve ◽  
Pore Diameter ◽  
Average Particle Size ◽  
Mesoporous Molecular Sieve ◽  
Average Particle ◽  
Narrow Size Distribution ◽  
Sem Image ◽  
Mesoporous Silicate

Nanosize SiO 2 particles with narrow size distribution were produced by modified Stober–Fink–Bohn method. Average particle size was determined as 170 nm by SEM image. Organosilica mesoporous molecular sieve (MCM-48) was synthesized. The calcined MCM-48 has pore diameter of 26.8 Å and a surface area of 1024 m 2 g -1 by BET (Brunauer–Emmet–Teller) measurement.

Preparation, characterization, and catalytic performance of Ta-HMS mesoporous molecular sieve

2016 ◽  
Vol 90 (8) ◽  
pp. 1545-1551 ◽  
Author(s):  
Xuefeng Li ◽  
Like Zhang ◽  
Huanxin Gao ◽  
Qingling Chen
Keyword(s):  
Molecular Sieve ◽  
Catalytic Performance ◽  
Mesoporous Molecular Sieve
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