A Mechanochemical Approach for the Preparation of Zeolite Catalyst without Acid Sites on the External Surface

外表面无酸位沸石催化剂的机械化学制备方法

• 批准号: 24656488
• 负责人: WAKIHARA TORU
• 金额: $ 2.66万
• 依托单位: The University of Tokyo (2013)Yokohama National University (2012)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Challenging Exploratory Research
• 财政年份: 2012
• 资助国家: 日本
• 起止时间: 2012-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-24656488/
• 关键词: ゼオライト; メカノケミカル; 触媒; パラキシレン; 外表面; 表面処理

The acid sites associated with the external surface of zeolite particles are responsible for undesirable consecutive reactions, such as isomerization, alkylation and oligomerization, resulting in a lower selectivity to a target product; therefore, the selective modification (deactivation) of the external surface of zeolite particles has been an important issue in zeolite science. Here, a new method for the surface deactivation of zeolite catalyst was tested via a mechanochemical approach using powder composer. Post-synthetic mechanochemical treatment of ZSM-5 zeolite causes a selective deactivation of catalytically active sites only existing on the external surface, giving a unique ZSM-5 zeolite catalyst without acid sites on the external surface, as a potentially useful catalyst for highly selective production of p-xylene.

与沸石颗粒外表面相关的酸性中心负责不期望的连续反应，例如异构化、烷基化和低聚，导致对目标产物的较低选择性;因此，沸石颗粒外表面的选择性改性（失活）一直是沸石科学中的重要问题。在这里，一种新的方法，沸石催化剂的表面失活进行了测试，通过机械化学方法使用粉末组合物。ZSM-5沸石的合成后机械化学处理导致仅存在于外表面上的催化活性位点的选择性失活，得到在外表面上没有酸位点的独特ZSM-5沸石催化剂，作为用于高选择性生产对二甲苯的潜在有用的催化剂。