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Characteristics and catalytic properties of silica-supported Zirconocene/MAO catalysts for ethylene polymeriztion |
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| รหัสดีโอไอ | |
| Title | Characteristics and catalytic properties of silica-supported Zirconocene/MAO catalysts for ethylene polymeriztion |
| Creator | Piyarat Rodphon |
| Contributor | Bunjerd Jongsomjit |
| Publisher | Chulalongkorn University |
| Publication Year | 2554 |
| Keyword | Polyethylene, Metallocene catalysts, โพลิเอทิลีน, ตัวเร่งปฏิกิริยาเมทัลโลซีน |
| Abstract | Nowadays, the metallocene catalysts activated by methylaluminoxane are used in the synthesis of polyethylene because they give the high activity in ethylene polymerization. However these systems also have some big disadvantages such as the lack of morphology control. So, they need an excess amount of methylaluminoxane (MAO), which is very expensive. To overcome this drawback, the matallocene catalyst has to be attached on the support and also can be used in the slurry or gas-phase. In this research, silica as a support for metallocene catalyst system was studied. These studies were divided into two parts. In the first part, the copolymerization of ethylene/1-hexene with various the 1-hexene amount was investigated. The silica used in this part is in-house silica and the in situ impregnation was used in this part. It was found that when the amount of 1-hexene increased, the catalytic activity also increased. For the second part, the ex situ impregnation of methylaluminoxane on the commercial silica by varying the amount of methylaluminoxane was investigated. It can be seen the amounts of [Al]MAO on the commercial silica increased with increasing the amount of methylaluminoxane. |
| URL Website | cuir.car.chula.ac.th |
