1999
DOI: 10.1039/a900030e
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Adsorptive separation of methylalumoxane by mesoporous molecular sieve MCM-41

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Cited by 38 publications
(25 citation statements)
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“…SBA-15 has a wall thickness of 3.8 nm, while in SBA-15 synthesized with decane the wall thickness is 2.2 nm; for the 22.7 nm support was not possible to calculate the wall thickness due to the weak reflexions in the diffractogram. Moreover, a pore diameter around 11 nm must be an optimum pore size for SBA-15 materials and MAO/(nBuCp) 2 ZrCl 2 system in slurry ethylene polymerization, since it should be small enough for MAO stabilization through the carrier sieve effect, as mentioned in the introduction section according to Sano et al [23][24][25] On the contrary, at higher 1-hexene concentrations, the silica supported catalyst is the most active. The polymer that grows at such 1-hexene concentrations is less crystalline and consequently, less rigid to fragment the support particles effectively, so a support with bigger pore volume and therefore, the more brittle one will lead to higher catalytic activities.…”
Section: Resultsmentioning
confidence: 99%
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“…SBA-15 has a wall thickness of 3.8 nm, while in SBA-15 synthesized with decane the wall thickness is 2.2 nm; for the 22.7 nm support was not possible to calculate the wall thickness due to the weak reflexions in the diffractogram. Moreover, a pore diameter around 11 nm must be an optimum pore size for SBA-15 materials and MAO/(nBuCp) 2 ZrCl 2 system in slurry ethylene polymerization, since it should be small enough for MAO stabilization through the carrier sieve effect, as mentioned in the introduction section according to Sano et al [23][24][25] On the contrary, at higher 1-hexene concentrations, the silica supported catalyst is the most active. The polymer that grows at such 1-hexene concentrations is less crystalline and consequently, less rigid to fragment the support particles effectively, so a support with bigger pore volume and therefore, the more brittle one will lead to higher catalytic activities.…”
Section: Resultsmentioning
confidence: 99%
“…On the other hand, the different natures of S ext and S int sites could be also explained according to Sano et al, [23][24][25] who proposed changes in the MAO structure due to the pore size. Therefore, it is possible that, as a result of the different MAO structures existing in the pore openings and inside, the 1-hexene reactivity ratio of S ext and S int sites is different.…”
Section: Resultsmentioning
confidence: 99%
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“…25 Å in diameter is effective for ethylene polymerization. [14] From such a viewpoint, to get further information on the cocatalytic performance of the separated MAO, propylene polymerization was conducted with rac-ethylene-(bisindenyl)zirconium dichloride (rac-Et(Ind) 2 ZrCl 2 ), which shows isospecificity in a-olefin polymerizations, combined with the separated MAO.…”
Section: Introductionmentioning
confidence: 99%
“…Since then, many research groups have patented new families of materials with different pore structures, pore sizes and synthesis methods: several methods are needed in the manufacturing process of new porous materials organized "MPO". At present, a new family of ordered mesoporous solids is very widely studied by many researchers from different horizons for various applications including adsorption [3,4] and catalysis. In the field of adsorption, mesoporous materials such as MCM-41, HMS, SBA-15, SBA-1 have been functionalized by various groups for the adsorption of metal ions and various organic pollutants (synthetic dyes) [5].…”
Section: -Introductionmentioning
confidence: 99%