| 王潇潇,郭少青,张伟,赵亮富.SAPO-11分子筛合成条件对其结晶度与催化性能的影响[J].分子催化,2013,(4):295-306 |
| SAPO-11分子筛合成条件对其结晶度与催化性能的影响 |
| Effect of Synthesis Conditions on the Crystallinity and Catalytic Performances of SAPO-11 Molecular Sieves |
| 投稿时间：2013-07-24 修订日期：2013-08-13 |
| DOI： |
| 中文关键词: 合成条件 结晶度 萘的甲基化 催化性能 |
| 英文关键词:Synthesis conditions Crystallinity Naphthalene methylation Catalytic performances |
| 基金项目:国家高技术研究发展计划（863计划） |
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| 摘要点击次数: 1915 |
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| 中文摘要: |
| 在水热条件下改变合成条件合成一系列SAPO-11分子筛，采用XRD对样品进行结晶度表征，并考察了合成条件对SAPO-11分子筛催化性能的影响。结果表明，合成条件对SAPO-11分子筛的结晶度和催化性能有很大影响。以二正丙胺（DPA）为模板剂，n（DPA）/ n（Al2O3）= 1.5，n（SiO2）/ n（Al2O3）= 0.2，晶化时间为24h和晶化温度为170℃时，合成出的SAPO-11分子筛催化剂最有利于萘和甲醇的甲基化反应。初步探究其在萘和甲醇的甲基化反应中的失活原因。结果表明，催化剂失活的主要原因是在萘和甲醇的甲基化反应过程中生成大量的水，经高温水脱铝导致分子筛结构坍塌，从而导致分子筛失活。 |
| 英文摘要: |
| A series of SAPO-11 molecular sieves were synthesized hydrothermally by varying the synthesis conditions, and were characterized by X-ray diffraction (XRD). The effects of synthesis conditions on the catalytic performances of SAPO-11 were also investigated. The results indicated that synthesis conditions had strong influence on the crystallinity and catalytic performances of SAPO-11. SAPO-11 molecular sieve was synthesized with di-n-propylamine (DPA) template at n(DPA):n(Al2O3) = 1.5, n(SiO2):n(Al2O3) = 0.2, crystallization time of 24 h and crystallization temperature of 170 ℃, which was beneficial to the methylation of naphthalene with methanol. The deactivation behavior of SAPO-11 molecular sieve for the methylation of naphthalene with methanol was investigated. The results showed that a large number of water were generated in the methylation of naphthalene with methanol, which led to the structure collapse by the dealumination of high temperature stream, thus leading to the deactivation of molecular sieves. |
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