scholarly journals Photocatalytic Properties of Nb/MCM-41 Molecular Sieves: Effect of the Synthesis Conditions

Coatings ◽  
2015 ◽  
Vol 5 (3) ◽  
pp. 511-526 ◽  
Author(s):  
Caterine Gomez ◽  
J. Rodriguez-Paez
Keyword(s):  
Molecular Sieves ◽  
Photocatalytic Properties ◽  
Synthesis Conditions ◽  
Mcm 41

Titanium-modified MCM-41 molecular sieves as efficient supports to increase the hydrogenation abilities of NiMoS and CoMoS catalysts

2021 ◽  
Vol 95 ◽  
pp. 340-349
Author(s):  
Franklin J. Méndez ◽  
Roylena Vargas ◽  
Joel Blanco ◽  
Yahsé Rojas-Challa ◽  
Ernesto Bastardo-González ◽  
...  
Keyword(s):  
Molecular Sieves ◽  
Mcm 41

Highly selective synthesis of styrene oxide over phosphotungstic acid supported on mesoporous Mn-MCM-41 molecular sieves

2009 ◽  
Vol 17 (1) ◽  
pp. 57-68 ◽  
Author(s):  
GuangQing Liu ◽  
GuangJian Wang ◽  
ZhenXing Yang ◽  
YiWu Liu ◽  
MingXia Xu ◽  
...  
Keyword(s):  
Molecular Sieves ◽  
Phosphotungstic Acid ◽  
Styrene Oxide ◽  
Selective Synthesis ◽  
Mcm 41

Synthesis of Spherical Mesoporous Co-MCM-41

2009 ◽  
Vol 79-82 ◽  
pp. 131-134
Author(s):  
Peng Sun ◽  
Yan Kong ◽  
Jun Du ◽  
Xin Jie Xu ◽  
Jun Wang ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Catalytic Activity ◽  
Significant Influence ◽  
Cobalt Content ◽  
Synthesis Conditions ◽  
Hydroxylation Of Benzene ◽  
Direct Hydroxylation ◽  
Mcm 41

A serious of spherical Co-MCM-41s with different cobalt content was synthesized and characterized by XRD, SEM, N2 isotherms and ICP techniques. The influences of synthesis conditions on the structure were also studied. The use of ascorbic acid as reductant had significant influence on the morphology and the catalytic activity of Co-MCM-41. The prepared samples exhibited higher catalytic activity in the direct hydroxylation of benzene by H2O2 than those with common morphology.

Effect of rehydration on the porosity of MCM-41 mesoporous molecular sieves

1999 ◽  
Vol 35 (1) ◽  
pp. 52-56
Author(s):  
F. M. Bobonich ◽  
Yu. G. Voloshina ◽  
L. A. Matkovskaya ◽  
V. N. Solomakha ◽  
Yu. G. Gol’tsov
Keyword(s):  
Molecular Sieves ◽  
Mesoporous Molecular Sieves ◽  
Mcm 41

scholarly journals Hoveyda–Grubbs type metathesis catalyst immobilized on mesoporous molecular sieves MCM-41 and SBA-15

2011 ◽  
Vol 7 ◽  
pp. 22-28 ◽  
Author(s):  
Hynek Balcar ◽  
Tushar Shinde ◽  
Naděžda Žilková ◽  
Zdeněk Bastl
Keyword(s):  
Nmr Spectroscopy ◽  
Molecular Sieves ◽  
Direct Interaction ◽  
Mesoporous Molecular Sieves ◽  
Support Surface ◽  
Wall Surface ◽  
Ring Closing Metathesis ◽  
Immobilized Catalysts ◽  
Metathesis Catalyst ◽  
Mcm 41

A commercially available Hoveyda–Grubbs type catalyst (RC303 Zhannan Pharma) was immobilized on mesoporous molecular sieves MCM-41 and on SBA-15 by direct interaction with the sieve wall surface. The immobilized catalysts exhibited high activity and nearly 100% selectivity in several types of alkene metathesis reactions. Ru leaching was found to depend on the substrate and solvent used (the lowest leaching was found for ring-closing metathesis of 1,7-octadiene in cyclohexane – 0.04% of catalyst Ru content). Results of XPS, UV–vis and NMR spectroscopy showed that at least 76% of the Ru content was bound to the support surface non-covalently and could be removed from the catalyst by washing with THF.

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