Download or read book Ethylene Polymerization Over Supported Organochromium Catalysts written by Shi-Liang Fu and published by . This book was released on 1990 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Silica Supported Chromium Catalysts for the Polymerization of Ethylene written by David Lewis Myers and published by . This book was released on 1986 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effect of the Silica Support on the Reactivity and Polymerization Activity of Organochromium Complexes written by Anqiu Fu and published by . This book was released on 2002 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Morphological Study of Silica Supported Chromium Catalysts for Ethylene Polymerization written by Edward Landis Weist and published by . This book was released on 1988 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Some Challenges in Ethylene Polymerization written by Dennis Pao-Chang Lo and published by Ann Arbor, Mich. : University Microfilms International. This book was released on 2003 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Handbook of Transition Metal Polymerization Catalysts written by Ray Hoff and published by John Wiley & Sons. This book was released on 2018-04-20 with total page 895 pages. Available in PDF, EPUB and Kindle. Book excerpt: Including recent advances and historically important catalysts, this book overviews methods for developing and applying polymerization catalysts – dealing with polymerization catalysts that afford commercially acceptable high yields of polymer with respect to catalyst mass or productivity. • Contains the valuable data needed to reproduce syntheses or use the catalyst for new applications • Offers a guide to the design and synthesis of catalysts, and their applications in synthesis of polymers • Includes the information essential for choosing the appropriate reactions to maximize yield of polymer synthesized • Presents new chapters on vanadium catalysts, Ziegler catalysts, laboratory homopolymerization, and copolymerization

Download or read book The Effects of Oxygen on the Polymerization of Ethylene in the Presence of Supported Chromium Oxide Catalysts written by Vincent Gerard Murphy and published by . This book was released on 1971 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Low pressure gas phase polymerization of ethylene on supported chromium oxide catalysts written by Rustum Jehangir Adranvala and published by . This book was released on 1973 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Catalytic Polymerization of Olefins written by T. Keii and published by Elsevier. This book was released on 1986-04-01 with total page 505 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers the proceedings of a symposium which was attended by researchers from all over the world who reported on and discussed recent advances in the field of catalytic polymerization of olefins. Over two decades have elapsed since the discovery of the Ziegler-Natta catalyst. Tremendous research effort has been aimed at improving this marvelous catalyst. In twenty-five years since the first publication, more than 15,000 papers and patents on the subject and on related subjects have appeared. This effort has yielded new generations of Ziegler-Natta catalysts with superior activity and stereospecificity. The complexities arising from the heterogeneity of the catalyst, however, have hindered understanding of the catalytic processes which take place on the catalyst surface. Nevertheless, many fundamental features of the catalyst system have now been clarified reasonably well. Recently a highly active homogeneous catalytic system has been developed, which is capable of catalyzing even isotactic polymerization of propene. There is no doubt that this finding will not only contribute to our understanding of the detailed mechanism of polymerization but also stimulate the development of various kinds of tailored polymers. Thus this subject will remain of paramount importance in the development of chemistry and polymer science for a long time to come.

Download or read book Polymerization of Ethylene with Supported Early and Late Transition Metal Catalysts written by Yiyoung Choi and published by . This book was released on 2011 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: Single-site catalysts revolutionized the polyolefin manufacturing industry and research with their ability to make polymers with uniform microstructural properties. Several of these catalysts are currently used commercially to produce commodity and differentiated-commodity resins. The key to their rapid success and industrial implementation resides in the fact that they can be used without major modifications in the polymerization reactors that previously used heterogeneous Ziegler-Natta and Phillips catalysts. Since most of these industrial processes use slurry or gas-phase reactors, soluble single-site catalysts must be supported on adequate carriers that ensure not only high activity, but also the formation of polymer particles with the proper morphology and bulk densities. Metallocene catalysts have been supported on a variety of carriers, but supporting late transition metal catalysts has not been investigated in detail, despite their very interesting properties such as tolerance to polar comonomers and impurities, activity in the absence of MAO, and the formation of short chain branches by the chain walking mechanism. The research work of this PhD thesis intends to fill this gap, by developing supported late transition metal catalysts with high catalyst activities towards ethylene polymerization and good polymer particle morphology.

Download or read book The Effects of Oxygen on the Polymerization of Ethylene in the Presence of Supported Chromium Oxide Catalysis written by John W. Eldridge and published by . This book was released on 1971 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: The polymerization of ethylene over a supported chromium oxide catalyst was studied first in the complete absence of oxygen and then with controlled amounts of oxygen (60 to 600 micro mole/g catalyst) present. The catalyst was prepared by impregnating a microspheroidal silica-alumina (87 - 13 wt. %) with a dilute solution of chromic acid. This raw compound was then activated by heating it in vacuo at 550C. The data indicated that the inhibitory effect of oxygen involved the chemisorption of some oxygen containing species which could in time be displaced by an excess of ethylene. A comparison of the molecular weight distributions of the products with the rates of polymerization at shutdown suggested that higher rates of reaction cause local heating within the reactor, thereby increasing local rates of chain transfer and broadening the distribution. (Author).

Download or read book Experimental Studies of Mechanisms in Ethylene Polymerisation on Supported Chromium Catalysts written by Otto Morten Bade and published by . This book was released on 1997 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Handbook of Transition Metal Polymerization Catalysts written by Ray Hoff and published by John Wiley & Sons. This book was released on 2018-04-20 with total page 764 pages. Available in PDF, EPUB and Kindle. Book excerpt: Including recent advances and historically important catalysts, this book overviews methods for developing and applying polymerization catalysts – dealing with polymerization catalysts that afford commercially acceptable high yields of polymer with respect to catalyst mass or productivity. • Contains the valuable data needed to reproduce syntheses or use the catalyst for new applications • Offers a guide to the design and synthesis of catalysts, and their applications in synthesis of polymers • Includes the information essential for choosing the appropriate reactions to maximize yield of polymer synthesized • Presents new chapters on vanadium catalysts, Ziegler catalysts, laboratory homopolymerization, and copolymerization

Download or read book Copolymerization of Ethylene 1 octene Over Gallium modified Silica supported Metallocene Catalyst written by and published by . This book was released on 2008 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nowadays, for polyethylene production, Ziegler-Natta catalysts, metallocene catalysts, and supported metal oxide (Philips process) all are capable of producing linear polyethylene. Metallocene catalysts activated by methylaluminoxane show very high activity in ethylene polymerization. The development of supported metallocenes is crucial for industrial application because it enables their use in gas- and slury-phase processes and prevent reactor-fouling problems. This research proposed the development and improvement of metallocne catalyst, such as the [rac-Et(Ind)2ZrCl2] catalyst system, by using gallium- modified silica support for ethylene/1-octene copolymerization. These studies were divided in two parts. In the first part, in this research, the effect of gallium modification and impregnation method was studied. It was found that an addition of gallium into support can improve activity and the in situ impregnation exhibited higher catalytic activity than the ex situ method. In the second part, the impact of gallium modification on silica-supported metallocene catalyst via in situ impregnation on the different pore sizes of silica was investigated. It was found that the catalytic activity of the large pore silica was lower than the small pore system. All the obtained polymers were characterized by DSC, and 13C NMR to determine the polymer properties and polymer microstructure. All the obtained polymers were characterized by DSC, and 13C NMR to determine the polymer properties and polymer microstructure.

Download or read book Ethylene Polymerization Using Silica Supported Metallocene Catalysts written by Eyad Abedalrazek and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Olefin Polymerization with Supported Metallocene Catalysts written by Shreyas Chakravarti and published by . This book was released on 2000 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Magnesium Oxide Supported Ethylene Polymerization Catalysts written by Choosak Poonsawat and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: