The Experts below are selected from a list of 219 Experts worldwide ranked by ideXlab platform
Zhongmin Liu - One of the best experts on this subject based on the ideXlab platform.
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synthesis of ti mcm 41 using colloidal silica and Titanium Trichloride ii characterization of ti mcm 41 molecular sieve
2001Co-Authors: Q Xin, Zhongmin LiuAbstract:The Ti-MCM-41 molecular sieve synthesized with colloidal silica and Titanium Trichloride has been characterized by nitrogen adsorption, TG-DTA and spectroscopies of FT-IR, UV-Vis and UV-Raman. N-2 adsorption isotherms reveal that with the incorporation of Titanium into the framework of the molecular sieve, the pore size decreases and the wall thickness increases. TG and DTA profiles suggest that different template sorption sites exist in the framework of Ti-MCM-41. FT-IR, UV-Vis and UV-Raman spectra indicate that the formation of anatase TiO2 can be avoided during the preparation of the synthesis gel and the crystallization of the molecular sieve. Most Ti4(+) ions are isolated and tetrahedrally coordinated in the framework of MCM-41.
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ti mcm 41 synthesized from colloidal silica and Titanium Trichloride synthesis characterization and catalysis
Chemistry of Materials, 2001Co-Authors: Zhaochi Feng, Q Xin, Zhongmin LiuAbstract:Titanium-containing mesoporous molecular sieve Ti−MCM-41 has been synthesized using colloidal silica as the silicon source and TiCl3 solution as the Titanium source and was characterized by X-ray diffraction, N2 adsorption, UV−vis, and UV−Raman spectroscopies. The formation of anatase TiO2 can be avoided during the synthesis and the crystallization of the molecular sieve because of the relatively low hydrolysis rate of an inorganic TiCl3 solution. The characterization results confirm that most Ti4+ ions are isolated and tetrahedrally coordinated in the framework of MCM-41. Different auxiliary templates, tetramethylammonium hydroxide (TMAOH), tetraethylammonium hydroxide (TEAOH), tetrabutylammonium hydroxide, and NH3·H2O were used to synthesize the Ti−MCM-41 molecular sieve. Among them, TMAOH and TEAOH were found to be the most effective auxiliary templates to improve the long-ranged order of the molecular sieves.
Arnold L. Rheingold - One of the best experts on this subject based on the ideXlab platform.
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New Examples of Half-Sandwich (Borylcyclopentadienyl)Titanium Trichloride Complexes and an X-ray Structural Characterization of the Homobimetallic Complex [TiCl3{η5-C5H4}]2BPh
Organometallics, 1996Co-Authors: Scott A. Larkin, Jeffery T. Golden, Pamela J. Shapiro, Arnold L. RheingoldAbstract:A new series of half-sandwich (borylcyclopentadienyl)Titanium Trichloride complexes have been prepared which include the boryl substituents [1,2-(C6H4O2)]B−, Ph(Cl)B−, Ph2B− and a (PhB
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new examples of half sandwich borylcyclopentadienyl Titanium Trichloride complexes and an x ray structural characterization of the homobimetallic complex ticl3 η5 c5h4 2bph
Organometallics, 1996Co-Authors: Scott A. Larkin, Jeffery T. Golden, Pamela J. Shapiro, Glenn P A Yap, And David Ming Jin Foo, Arnold L. RheingoldAbstract:A new series of half-sandwich (borylcyclopentadienyl)Titanium Trichloride complexes have been prepared which include the boryl substituents [1,2-(C6H4O2)]B−, Ph(Cl)B−, Ph2B− and a (PhB<)-bridged bimetallic complex. No correlation was found between the 1H and 13C NMR chemical shifts of the cyclopentadienyl ring in these complexes and the Lewis acidity of the attached boryl group. The crystal structure of the phenylboron-bridged bimetallic complex PhB{(η5-C5H4)TiCl3}2 was determined. The cyclopentadienylTitanium units of the molecule are twisted away from each other, forming an angle of 41° between the cyclopentadienyl ring planes. Each cyclopentadienyl ring is twisted out of the trigonal plane of the boron by 24°. Preliminary results concerning the Ti-alkylation of some of these complexes are described.
Lido Porri - One of the best experts on this subject based on the ideXlab platform.
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polymerization of styrene with the Titanium Trichloride methylaluminoxane catalyst system
Macromolecules, 1993Co-Authors: Marcos L. Dias, Antonino Giarrusso, Lido PorriAbstract:The polymerization of styrene with catalysts derived from aluminium-activated TiCl 3 , from hydrogen-activated TiCl 3 and from the soluble complex TiCl 3 .3THF was investigated. It was found that crystalline TiCl 3 gives on reaction with methylaluminoxane (MAO) in toluene two types of catalyst systems: a soluble one, which polymerizes styrene to syndiotactic polymer, and an insoluble one, which polymerizes styrene to isotactic one. A soluble catalyst for the syndiotactic polymerization of styrene can be obtained from TiCl 3 .THF and MAO.
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Polymerization of styrene with the Titanium Trichloride/methylaluminoxane catalyst system
Macromolecules, 1993Co-Authors: Marcos L. Dias, Antonino Giarrusso, Lido PorriAbstract:The polymerization of styrene with catalysts derived from aluminium-activated TiCl 3 , from hydrogen-activated TiCl 3 and from the soluble complex TiCl 3 .3THF was investigated. It was found that crystalline TiCl 3 gives on reaction with methylaluminoxane (MAO) in toluene two types of catalyst systems: a soluble one, which polymerizes styrene to syndiotactic polymer, and an insoluble one, which polymerizes styrene to isotactic one. A soluble catalyst for the syndiotactic polymerization of styrene can be obtained from TiCl 3 .THF and MAO.
Scott A. Larkin - One of the best experts on this subject based on the ideXlab platform.
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New Examples of Half-Sandwich (Borylcyclopentadienyl)Titanium Trichloride Complexes and an X-ray Structural Characterization of the Homobimetallic Complex [TiCl3{η5-C5H4}]2BPh
Organometallics, 1996Co-Authors: Scott A. Larkin, Jeffery T. Golden, Pamela J. Shapiro, Arnold L. RheingoldAbstract:A new series of half-sandwich (borylcyclopentadienyl)Titanium Trichloride complexes have been prepared which include the boryl substituents [1,2-(C6H4O2)]B−, Ph(Cl)B−, Ph2B− and a (PhB
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new examples of half sandwich borylcyclopentadienyl Titanium Trichloride complexes and an x ray structural characterization of the homobimetallic complex ticl3 η5 c5h4 2bph
Organometallics, 1996Co-Authors: Scott A. Larkin, Jeffery T. Golden, Pamela J. Shapiro, Glenn P A Yap, And David Ming Jin Foo, Arnold L. RheingoldAbstract:A new series of half-sandwich (borylcyclopentadienyl)Titanium Trichloride complexes have been prepared which include the boryl substituents [1,2-(C6H4O2)]B−, Ph(Cl)B−, Ph2B− and a (PhB<)-bridged bimetallic complex. No correlation was found between the 1H and 13C NMR chemical shifts of the cyclopentadienyl ring in these complexes and the Lewis acidity of the attached boryl group. The crystal structure of the phenylboron-bridged bimetallic complex PhB{(η5-C5H4)TiCl3}2 was determined. The cyclopentadienylTitanium units of the molecule are twisted away from each other, forming an angle of 41° between the cyclopentadienyl ring planes. Each cyclopentadienyl ring is twisted out of the trigonal plane of the boron by 24°. Preliminary results concerning the Ti-alkylation of some of these complexes are described.
Zhaochi Feng - One of the best experts on this subject based on the ideXlab platform.
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ti mcm 41 synthesized from colloidal silica and Titanium Trichloride synthesis characterization and catalysis
Chemistry of Materials, 2001Co-Authors: Zhaochi Feng, Q Xin, Zhongmin LiuAbstract:Titanium-containing mesoporous molecular sieve Ti−MCM-41 has been synthesized using colloidal silica as the silicon source and TiCl3 solution as the Titanium source and was characterized by X-ray diffraction, N2 adsorption, UV−vis, and UV−Raman spectroscopies. The formation of anatase TiO2 can be avoided during the synthesis and the crystallization of the molecular sieve because of the relatively low hydrolysis rate of an inorganic TiCl3 solution. The characterization results confirm that most Ti4+ ions are isolated and tetrahedrally coordinated in the framework of MCM-41. Different auxiliary templates, tetramethylammonium hydroxide (TMAOH), tetraethylammonium hydroxide (TEAOH), tetrabutylammonium hydroxide, and NH3·H2O were used to synthesize the Ti−MCM-41 molecular sieve. Among them, TMAOH and TEAOH were found to be the most effective auxiliary templates to improve the long-ranged order of the molecular sieves.
