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| 不同分子筛前驱体对γ-氧化铝改性的影响 |
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刘大鹏1,2,杨涛2,3,赵瑞玉2,3
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(1.中国石油大学 理学院,山东 青岛 266580;2.中国石油大学 CNPC催化重点实验室,山东 青岛 266580;3.中国石油大学 重质油国家重点实验室,山东 青岛 266580)
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| 摘要: |
| 用炭黑扩孔的方法制备出孔径较大的γ-Al2O3载体,然后用不同的ZSM-5分子筛前驱体对其进行表面改性。考察晶化时间、硅硼比等对ZSM-5分子筛前驱体的影响;采用XRD、IR、Py-IR和BET等手段对改性前后载体的酸性、孔结构等表面性质进行表征。结果表明:经过扩孔和ZSM-5分子筛前驱体改性后的γ-Al2O3载体的平均孔径由扩孔前的6.9 nm增加到9.0 nm左右,孔径分布中大于10 nm的孔有所增加; ZSM-5前驱体改性后不会导致γ-Al2O3载体的堵孔;载体的酸性增强并出现一定的B酸位。 |
| 关键词: 催化剂 分子筛前驱体 扩孔 表面改性 |
| DOI：10.3969/j.issn.1673-5005.2013.01.027 |
| 分类号::TE 624. 4 |
| 基金项目:国家重点基础研究发展计划“973”项目(2010CB226905); 中石油炼油催化剂研制开发与工业应用重大专项(1001A050104) |
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| Effect of different zeolite precursors on modification of γ-Al2O3 |
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LIU Da-peng1,2, YANG Tao2,3, ZHAO Rui-yu2,3
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(1.College of Science in China University of Petroleum, Qingdao 266580, China;2.CNPC Key Laboratory of Catalysis in China University of Petroleum, Qingdao 266580, China;3.State Key Laboratory of Heavy Oil Processing in China University of Petroleum, Qingdao 266580, China)
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| Abstract: |
| The γ-Al2O3 carrier with larger pore diameter was prepared by using carbon black method, and the surface was modified with different ZSM-5 zeolite precursors. The influences of crystallization time, the ratio of Si and B on ZSM-5 zeolite precursors were also examined. The samples were characterized by XRD, IR, Py-IR and BET analytical techniques to examine the surface property such as the acidity, pore structure. The results show that the γ-Al2O3supports after pore enlargement and modification with ZSM-5 zeolite precursors have an average pore diameter of 9.0 nm compared with 6.9 nm before pore enlargement. There are more pores being larger than 10 nm in pore size distribution. The zeolite precursors would not block up the pores of γ-Al2O3 carrier. The acidity of carrier modified by ZSM-5 zeolite precursors is significantly enhanced and certain Brnsted acid sites emerge. |
| Key words: catalyst zeolite precursors pore enlargement surface modification |
