Cu-SSZ-13的合成与金属改性及催化MTO性能
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O643.36;TQ426.94

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Synthesis and Metals-Modification of Cu-SSZ-13 Molecular Sieve and Its Catalytic Performance in MTO Reaction
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    摘要:

    以低廉的铜氨络合物(Cu-TEPA)为模板剂,通过原位水热合成法制备了Cu-SSZ-13。考察了两种铜盐和氢氧化钠用量对Cu-SSZ-13的晶相结构和形貌的影响,测试了两种铜盐制备的Cu-SSZ-13和金属改性的Cu-SSZ-13在甲醇制烯烃(MTO)中的催化性能。用X射线荧光光谱(XRF)、X射线衍射(XRD)、扫描电子显微镜(SEM)、N2等温吸附-脱附(BET)和NH3程序升温脱附(NH3-TPD)对催化剂进行了表征。结果表明:碱度对Cu-SSZ-13的结晶度有很大影响,较高或较低的碱度会导致方沸石杂晶的产生,甚至生成纯相方沸石;在MTO反应中,硝酸铜制备的Cu-SSZ-13的氢转移反应剧烈,反应初期丙烷选择性达到40%,远高于硫酸铜制备的Cu-SSZ-13的19%。锰改性的Cu-SSZ-13明显提高了抗积炭失活能力,在反应温度440℃和质量空速5h-1条件下的催化寿命从未改性的30min延长到65min。

    Abstract:

    Cu-SSZ-13 was in situ hydrothermally synthesized using a template of a low-cost copper amine complex (Cu-TEPA). The effects of two copper salts and n(Na2O):n(Al2O3) on the crystal phase and morphological were studied, the catalyzation of methanol to olefins(MTO) of Cu-SSZ-13 prepared with two copper salts and metal cation modified Cu-SSZ-13 was tested. The catalysts were characterized by XRF, XRD, SEM, BET and NH3-TPD. The results show that alkalinity has a great influence on the crystallinity of Cu-SSZ-13, if the alkalinity was excessively high or low, zeolite analcime as an impurity or pure phase would be produced; During the reaction of MTO, hydrogen transfer reaction of Cu-SSZ-13 prepared with cupric nitrate is intense, the propane selectivity reached 40% in the early stage of the reaction, far higher than the 19% of Cu-SSZ-13 prepared with cupric sulfate. Cu-SSZ-13 modified with Mn exhibits a stronger ability in resisting pore blockage deactivation, under the reaction condition of reaction temperature 440℃ and WHSV 5h-1, its lifetime extended from 30minutes to 65minutes.

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赵飞. Cu-SSZ-13的合成与金属改性及催化MTO性能[J].精细化工,2017,34(2):0

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  • 收稿日期:2016-06-29
  • 最后修改日期:2016-09-09
  • 录用日期:2016-09-30
  • 在线发布日期: 2017-01-18
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