Temperature-programmed decomposition of a magnesium chloride/THF/titanium tetrachloride bimetallic complex catalyst and its effect on ethylene polymerization rate

1993 ◽  
Vol 26 (3) ◽  
pp. 452-456 ◽  
Author(s):  
Hong K. Choi ◽  
Dong W. Chung ◽  
Taek K. Han ◽  
Seong I. Woo
Keyword(s):  
Magnesium Chloride ◽  
Ethylene Polymerization ◽  
Titanium Tetrachloride ◽  
Polymerization Rate ◽  
Bimetallic Complex ◽  
Complex Catalyst ◽  
Temperature Programmed ◽  
Temperature Programmed Decomposition

scholarly journals THERMAL DECOMPOSITION OF BARZAS COALS

2021 ◽  
Vol 64 (3) ◽  
pp. 92-99
Author(s):  
Ivan Ya. Petrov ◽  
Boris G. Tryasunov ◽  
Alexander R. Bogomolov ◽  
Konstantin Yu. Ushakov ◽  
Alexander S. Zyabrev
Keyword(s):  
Thermal Decomposition ◽  
Temperature Region ◽  
Adsorbed Water ◽  
Volatile Components ◽  
Coal Pyrolysis ◽  
Helium Atmosphere ◽  
Mineral Components ◽  
Temperature Programmed ◽  
Temperature Programmed Decomposition ◽  
Coal Organic Matter

Thermal decomposition processes of two types of Barzas sapromixites - a tile-like modification (“tile”) and a product of its weathering (“exfoliated tile”) - have been investigated in various media (air and helium). It has been shown that in the course of temperature-programmed decomposition (10 °C/min) of these forms of tile-like Barzas sapromixite, in both oxidizing (air) and inert (helium) atmospheres, four main temperature ranges can be distinguished: 1) < 150 °C - removal of adsorbed water (this temperature region is more pronounced for the weathered form of tile-like Barzas sapromixite); 2) 150-350 °C - removal of low molecular weight volatile components of coal in helium environment (with their simultaneous ignition in case of the decomposition in air); 3) 350-550 °C - the temperature region of primary or fast coal pyrolysis in an inert medium; in an oxidative medium, this stage of pyrolysis is accompanied by the burning of released tarry substances; 4) > 550 °C - the temperature region of secondary or high-temperature coal pyrolysis to form semi-coke in helium atmosphere, or the region of burning this semi-coke in air medium. Thermal breakdown processes of “exfoliated tiles” in the temperature range of the most intensive decomposition (350-550 °C) have been found to require less energy consumptions than the similar processes for tile-like Barzas coals (by 72-73 kJ/mol for both gas media of thermal treatment). It is supposed that the differences observed in thermal behavior of Barzas sapromixite forms under investigation may be related to the different contents of mineral components and their effects on the thermal decomposition of coal organic matter.

Temperature programmed decomposition of cobalt ethylene diamine complexes

1999 ◽  
Vol 334 (1-2) ◽  
pp. 141-148 ◽  
Author(s):  
S Dash ◽  
P.K Ajikumar ◽  
M Kamruddin ◽  
A.K Tyagi
Keyword(s):  
Ethylene Diamine ◽  
Temperature Programmed ◽  
Temperature Programmed Decomposition

Magnesium chloride supported bis(cyclopentadienyl)titanium(IV) dichloride-MAO catalyst for ethylene polymerization

1997 ◽  
Vol 198 (2) ◽  
pp. 495-503 ◽  
Author(s):  
Soumen Sen Sarma ◽  
Swaminathan Sivaram
Keyword(s):  
Magnesium Chloride ◽  
Ethylene Polymerization

A Novel Single-Site Catalyst for Olefin Polymerization

2010 ◽  
Vol 657 ◽  
pp. 83-87
Author(s):  
Sriram Venkataramani ◽  
Tharanikkarasu Kannan
Keyword(s):  
Ethylene Polymerization ◽  
Titanium Tetrachloride ◽  
Olefin Polymerization ◽  
Single Site ◽  
Turnover Frequency ◽  
Reaction Conditions ◽  
Co Catalyst ◽  
Infra Red ◽  
Turn Over Frequency ◽  
Turn Over

A novel single-site catalyst was prepared from N-pheneyldiethanolamine and titanium tetrachloride and characterized using spectroscopic methods such as Nuclear Magnetic Resonance (NMR) spectroscopy and Infra Red (IR) spectroscopy. It was prepared insitu and used to polymerize ethylene along with methylaluminoxane (MAO) as co-catalyst. The turnover frequency for ethylene polymerization was found to be 350 g and 550g polymer/mol catalyst/h for 1 bar and at 2 bar respectively. As the turn over frequency at the studied reaction conditions is good, the present N-pheneyldiethanolamine-based catalyst is a good single-site catalyst for olefin polymerization

A Study on Kinetics Parameters of Titanium Hydride Powder from Its TPD Spectrum for Metal Foam

2007 ◽  
Vol 534-536 ◽  
pp. 937-940 ◽  
Author(s):  
Dong Hui Yang ◽  
Sang Youl Kim ◽  
Bo Young Hur
Keyword(s):  
Titanium Hydride ◽  
Metal Foam ◽  
Al Alloy ◽  
Superposition Method ◽  
Kinetics Parameters ◽  
Foaming Process ◽  
Titanium Hydride Powder ◽  
Temperature Programmed ◽  
Set Up ◽  
Temperature Programmed Decomposition

In this paper, the whole temperature programmed decomposition (TPD) spectrum of titanium hydride was acquired by the special designed set-up. After separating and simulating the TPD spectrum by using Spectrum Superposition Method (SSM), Consulting Table Method (CTM) and differential spectrum technique, the kinetics parameters of titanium hydride and corresponding equations were obtained. Using these kinetics equations, the fabrication parameters of Al alloy foam can be determined and foaming process of Al alloy melt can be predicted.

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