| Título: | Comparison of Activity of Ziegler-Natta Catalysts Prepared by Recrystallization and Chemical Reaction Methods towards Polymerization of Ethylene |
| Autores: |
Pokasermsong, Piyavit; Chulalongkorn University Praserthdam, Piyasan; Chulalongkorn University |
| Fecha: | 2009-02-18 |
| Publicador: | Engineering Journal |
| Fuente: |
 |
| Tipo: | Peer-reviewed Article |
| Tema: | Environmental Engineering |
| Descripción: | In the present study, Ziegler-Natta catalysts were prepared on supports that were synthesized via two different methods. The first method (method A) is called the recrystallization method, which employed MgCl2 as a precursor. The second method (method B) is called chemical reaction method, which employed Mg(OEt)2 as a precursor. The catalysts were characterized by XRD, TGA, ESR and nitrogen physisorption. BET specific surface areas of catalyst A and B were 123.1 and 142.2 m2/g, respectively. Polymerization of ethylene was carried out over the catalyst and triethylaluminium. The catalyst prepared by method A exhibited higher activity than that prepared by method B. However, the properties of polymer obtained from both catalysts were similar. The results from XRD and TGA analyses confirmed that Mg(OEt)2 was converted to MgCl2. |
| Idioma: | Inglés |
1 Reviews on Solid Oxide Fuel Cell Technology por Laosiripojana, Navadol; King Mongkut's University of Technology Thonburi,Wiyaratn, Wisitsree; King Mongkut's University of Technology Thonburi,Kiatkittipong, Worapon; Silpakorn University,Arpornwichanop, Arnornchai; Chulalongkorn University,Soottitantawat, Apinan; Chulalongkorn University,Assabumrungrat, Suttichai; Chulalongkorn University | 6 Message from the Editor-in-Chief por Chongstitvattana, Prabhas |
2 Selecting Glass Window with Film for Buildings in a Hot Climate por Chaiyapinunt, Somsak; Chulalongkorn University,Khamporn, Nopparat; Siam University | 7 Reliability and Assessment Techniques on Ground Excavation por Tangchawal, Sanga; Chulalongkorn University |
3 The Industrial Engineer and Energy and Environment por Thongprasert, Sirichan; Chulalongkorn University | 8 Experimental Study on RC Beams Strengthened with Carbon and Glass Fiber Sheets por Lenwari, Akhrawat; Chulalongkorn University,Thepchatri, Thaksin; Chulalongkorn University |
4 Nuclear Fuels: Present and Future por Olander, Donald R.; University of California, Berkeley | 9 Pseudometrics for Nearest Neighbor Classification of Time Series Data por Korsrilabutr, Teesid; Chulalongkorn University,Kijsirikul, Boonserm; Chulalongkorn University |
5 Quantum Nanostructures by Droplet Epitaxy por Panyakeow, Somsak; Chulalongkorn University | 10 Finite Element Method for Analysis of Conjugate Heat Transfer between Solid and Unsteady Viscous Flow por Malatip, Atipong; Chulalongkorn University,Wansophark, Niphon; Chulalongkorn University,Dechaumphai, Pramote; Chulalongkorn University |