| 第 50 卷第 2 期 |  | Vol. 50 No. 2 | | 2020 年 4 月 | Apr 2020 |
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所屬欄目：功能材料
兩種鉻系催化劑的制備及催化乙烯聚合性能研究 |
| 王 鑒1，吳 霞1，張健偉1
（東北石油大學(xué) 化學(xué)化工學(xué)院，黑龍江 大慶 163318） |
| 摘 要：通過(guò)共浸漬法制備了Cr-V／SiO2、Cr-V-Ni／SiO2催化劑，比較了兩種催化劑孔結構和表觀(guān)形貌的差異，考察了浸漬pH值和活化溫度對催化劑聚合活性和產(chǎn)品結構性能的影響。結果表明：Cr-V-Ni／SiO2催化劑活性較Cr-V／SiO2提高22%，聚合產(chǎn)物分子量增大54%；浸漬液pH=7時(shí)，制得的Cr-V-Ni／SiO2催化劑活性最高，在45 ℃、0.18 MPa的聚合反應條件下，其催化活性達到109 g PE·gCat-1·h-1，且產(chǎn)物分散系數（PDI）值達8.28；600 ℃活化時(shí)，Cr-V-Ni／SiO2催化劑聚合產(chǎn)物的分子量較500 ℃增大54%。 |
| 關(guān)鍵詞：鉻系催化劑；聚乙烯；醋酸鎳；分子量；活性 |
| 中圖分類(lèi)號：TQ314.24+2 文獻標識碼：A 文章編號：1009-9212（2020）02-0050-04 |
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| Preparation of Two Kinds of Chromium-based Catalysts and Their Catalytic Performance for the Polymerization of Ethylene |
| WANG Jian1, WU Xia1, ZHANG Jian-wei1
(School of Chemistry and Chemical Engineering, North East Petroleum University, Daqing 163318,China) |
| Abstract：Cr-V/SiO2 and Cr-V-Ni/SiO2 catalysts were prepared by a co-impregnation method. The pore structure and apparent morphology of these two catalysts were compared, and the effects of impregnation pH and activation temperature on catalyst polymerization activity and product structure and performance were investigated. The results of polymerization test and characterization showed that the activity of Cr-V-Ni/SiO2 catalyst increased by 22%, and the molecular weight of the polymerization product increased by 54%.When the pH of the impregnated solution was 7, the Cr-V-Ni/SiO2 catalyst had the highest activity. Under the polymerization conditions of 45 ℃ and 0.18 MPa, the catalytic activity reached 109 g PE·gcat-1·h-1, and the molecular weight distribution of the product reached 8.28. When activated at 600 ℃, the molecular weight of the polymerization product of Cr-V-Ni/SiO2 catalyst increased by 54% compared with 500 ℃. |
| Key words：chromium catalyst; polyethylene; nickel; the modification; molecular weight |
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作者簡(jiǎn)介：王 鑒（1960-），男，山東牟平人，教授，博士，研究方向：烯烴聚合催化劑的合成與應用（E-mail：mrwj@nepu.edu.cn）。
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收稿日期：2020-04-08
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