Preparation and Characterization of MCM-41 Supported Metallocene Catalysts for Olefin Polymerization

Rahiala, Hanna; Beurroies, Isabelle; Eklund, Tom; Hakala, Kimmo; Gougeon, Régis D.; Trens, Philippe; Rosenholm, Jarl B.

doi:10.1006/jcat.1999.2657

Cited by 82 publications

(41 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Mesoporous silicates, such as MCM-41 and SBA-15, have hexagonal ordered pores forming an array of uniform mesopores (2-50 nm). [4,5] Trong On et al [4] reviewed catalytic applications of mesostructured materials for polymerization; since then, more applications of MCM-41 as a polymerization catalyst support have been disclosed, [6][7][8][9][10][11][12] notably in the so-called extrusion polymerization for the in situ production of polyethylene with fibrous morphology. [13][14][15] SBA-15 has been also investigated as a support for metallocenes to produce polyethylene fibers, [16][17][18] and as a metallocene carrier.…”

Section: Introductionmentioning

confidence: 99%

Ethylene/1‐Hexene Copolymers Produced with MAO/(nBuCp)₂ZrCl₂ Supported on SBA‐15 Materials with Different Pore Sizes

Paredes¹,

Grieken²,

Carrero³

et al. 2011

Macro Chemistry & Physics

View full text Add to dashboard Cite

The influence of the support architecture (structure and pore size) on the activity of MAO/(nBuCp)2ZrCl2 heterogeneous catalysts in the polymerization of ethylene and 1‐hexene is studied through the characterization of the polymers' microstructure. SBA‐15 silica‐based mesostructured materials are synthesized with different pore sizes and compared with commercial silica. All SBA‐15 supported catalysts lead to higher catalytic activities than amorphous silica and give rise to ethylene/1‐hexene copolymers with bimodal CCD, which suggests that the carrier structure plays an important role not only in the global rate of the process but also in the copolymer composition. The structures and pore sizes of the support show a marked influence on the polymer CCD shape. magnified image

show abstract

Section: Introductionmentioning

confidence: 99%

Ethylene/1‐Hexene Copolymers Produced with MAO/(nBuCp)₂ZrCl₂ Supported on SBA‐15 Materials with Different Pore Sizes

Paredes¹,

Grieken²,

Carrero³

et al. 2011

Macro Chemistry & Physics

View full text Add to dashboard Cite

show abstract

“…Studies on metallocene and other transition metal catalysts have been performed, dealing mainly with the effects of support composition, preparation and polymerisation conditions on polymerisation activity [5][6][7][8][9][10]. These investigations also show that mesostructured silicate materials allow the preparation of Philips catalysts with very high activities in ethylene polymerisation, particularly when using SBA-15 mesoporous silica [11,12].…”

Section: Introductionmentioning

confidence: 99%

Hybrid HDPE/MCM-41 nanocomposites: Crystalline structure and viscoelastic behaviour

Cerrada

Pérez

Lourenço

et al. 2010

Microporous and Mesoporous Materials

View full text Add to dashboard Cite

a b s t r a c tPolyethylene-based nanocomposites have been prepared by in situ polymerisation of ethylene with mesostructured MCM-41 within a large range of nanofiller concentrations. The structural, thermal and viscoelastic studies have shown that the use of mesoporous MCM-41 as catalyst carrier and its further presence in the final material is an effective route for the successful attainment of nanocomposites. Data shows that minimal changes in crystallinity are observed but crystallites become thicker as MCM-41 content is raised in the nanocomposites. A confinement effect is found and a delay in the crystallisation process of the macrochains within pores and channels is observed. These novel self-reinforced nanocomposites present an enhanced rigidity, which becomes more important as temperature is raised. Accordingly, they exhibit an improved mechanical performance without varying the final processing temperature since T m is the same for all of the specimens. In agreement with other works, it is confirmed that the MCM-41 acts as promoter for polyethylene degradation, an easier degradability being observed in these nanocomposites.

show abstract

“…This situation has already been discussed previously. [9,[22][23][24] Neither the calcined HTC host material nor the derivatized materials 5 and 6 possess catalytic activity towards the polymerization reactions of the olefins, indicating that the active species must contain molybdenum.…”

Section: Polymerization Catalytic Studiesmentioning

confidence: 97%

Pyridine Carboxylate Complexes of Mo^II as Active Catalysts in Homogeneous and Heterogeneous Polymerization

et al. 2007

View full text Add to dashboard Cite

New lamellar materials intercalated with molybdenum(II) complexes with potential catalytic properties were prepared by a stepwise procedure. The lamellar material was first calcined at 823 K for four hours to eliminate all the carbonate ions; the layered structure was reconstructed after treatment with a solution of either pycH (pyridine-2-carboxylic acid) or pydcH 2 (pyridine-2,6-dicarboxylic acid) in a KOH solution of dmf at 343 K. Impregnation with a solution of the organometallic precursor [Mo(CO) 3 I 2 (NCCH 3 ) 2 ] led to substitution of the nitrile groups by two pyridine ligands. All the materials were characterized by powder X-ray diffraction, FTIR, and 13 C CP MAS and 27 Al MAS solid-state NMR spectroscopy.

show abstract

Preparation and Characterization of MCM-41 Supported Metallocene Catalysts for Olefin Polymerization

Cited by 82 publications

References 32 publications

Ethylene/1‐Hexene Copolymers Produced with MAO/(nBuCp)₂ZrCl₂ Supported on SBA‐15 Materials with Different Pore Sizes

Ethylene/1‐Hexene Copolymers Produced with MAO/(nBuCp)₂ZrCl₂ Supported on SBA‐15 Materials with Different Pore Sizes

Hybrid HDPE/MCM-41 nanocomposites: Crystalline structure and viscoelastic behaviour

Pyridine Carboxylate Complexes of Mo^II as Active Catalysts in Homogeneous and Heterogeneous Polymerization

Contact Info

Product

Resources

About

Preparation and Characterization of MCM-41 Supported Metallocene Catalysts for Olefin Polymerization

Cited by 82 publications

References 32 publications

Ethylene/1‐Hexene Copolymers Produced with MAO/(nBuCp)2ZrCl2 Supported on SBA‐15 Materials with Different Pore Sizes

Ethylene/1‐Hexene Copolymers Produced with MAO/(nBuCp)2ZrCl2 Supported on SBA‐15 Materials with Different Pore Sizes

Hybrid HDPE/MCM-41 nanocomposites: Crystalline structure and viscoelastic behaviour

Pyridine Carboxylate Complexes of MoII as Active Catalysts in Homogeneous and Heterogeneous Polymerization

Contact Info

Product

Resources

About

Ethylene/1‐Hexene Copolymers Produced with MAO/(nBuCp)₂ZrCl₂ Supported on SBA‐15 Materials with Different Pore Sizes

Ethylene/1‐Hexene Copolymers Produced with MAO/(nBuCp)₂ZrCl₂ Supported on SBA‐15 Materials with Different Pore Sizes

Pyridine Carboxylate Complexes of Mo^II as Active Catalysts in Homogeneous and Heterogeneous Polymerization