高等学校化学学报

高等学校化学学报 ›› 2011, Vol. 32 ›› Issue (4): 939.

• 研究论文 • 上一篇    下一篇

两步晶化法合成纳米SAPO-34分子筛及其催化性能

杨德兴1,2, 王鹏飞1,2, 徐华胜1,2, 吕爱玲1,2, 胡杰1,2, 吕待清1,2   

  1. 1. 上海化工研究院, 上海 200062; 
    2. 上海绿强新材料有限公司, 上海 201608
  • 收稿日期:2010-06-23 修回日期:2010-11-24 出版日期:2011-04-10 发布日期:2011-03-09
  • 通讯作者: 王鹏飞 E-mail:wpf@sricims.com
  • 基金资助:

    国家“八六三”计划项目(批准号: 2007AA05Z326)和上海市科委纳米专项基金(批准号: 0952nm01200)资助.

Two-step Crystallization Synthesis and Catalytic Performance of Nano-scaled SAPO-34 Molecular Sieve

YANG De-Xing1,2, WANG Peng-Fei1,2*, XU Hua-Sheng1,2, LÜ Ai-Ling1,2, HU Jie1,2, LÜ Dai-Qing1,2   

  1. 1. Shanghai Research Institute of Chemical Industry, Shanghai 200062, China;
    2. Shanghai Luqiang New Materials Co.  Ltd.,    Shanghai 201608, China
  • Received:2010-06-23 Revised:2010-11-24 Online:2011-04-10 Published:2011-03-09
  • Contact: WANG Peng-Fei E-mail:wpf@sricims.com
  • Supported by:

    国家“八六三”计划项目(批准号: 2007AA05Z326)和上海市科委纳米专项基金(批准号: 0952nm01200)资助.

PDF (PC)

被引次数

28

摘要： 分别以拟薄水铝石、硅溶胶和磷酸为铝源、硅源和磷源，四乙基氢氧化铵为模板剂，采用两步水热晶化-双氧水氧化法合成出粒径200~300nm的小粒径SAPO-34分子筛。采用X射线衍射（XRD）、扫描电子显微镜（SEM）、NH3-TPD、BET等方法对合成的SAPO-34分子筛进行了表征。进一步考察了纳米SAPO-34分子筛在固定床甲醇制取烯烃(MTO)反应中的催化性能。结果表明，通过控制水热晶化过程的条件可有效地调控SAPO-34的晶粒大小。特别当第一步和第二步晶化温度为130℃和180℃时，可得到大小在200~300nm、晶型完整的SAPO-34分子筛。对于MTO反应，合成的纳米级SAPO-34的C2~C4选择性可达92%，单程寿命接近10h，显著优于以传统方法合成的大粒径SAPO-34。

关键词: 纳米SAPO-34, 两步晶化, 双氧水氧化处理, MTO

Abstract: In this study, nano-scaled SAPO-34 molecualr sieves with size in the range of 200~300 nm were synthesized by the two-step crystallization and H2O2 oxidation process, with pseudoboehmite, colloidal silica and H3PO4 as sources of aluminum, silicon and phosphorous and TEAOH as templates. The prepared SAPO-34 was characterized by XRD, SEM, NH3-TPD, BET and so on. The catalytic performance of the SAPO-34 on the methanol-to-olefins reactions (MTO) was carried out on a fixed bed. The results showed that the particle size of the SAPO-34 could be effectively modulated by the crystallization temperature of the two-step crystallization process. In particular, when the first and second crystallization were conducted at 130℃ and 180℃, cubic SAPO-34 with 200~300 nm size could be successfully synthesized. Compared with the micro-scaled SAPO-34 prepared by the traditional hydrothermal process, the nano-scaled SAPO-34 crystals synthesized here showed better performance in the MTO reaction and the selectivity of C2~C4 and the lifetime for one-turn could attained about 92% and 10 hours, respectively.

Key words: nano-scaled SAPO-34, two-step crystallization, H2O2 oxidizing treatment, MTO

TrendMD: