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

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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