Catalysis by Ultra Strong Acid Sitcs in Zeotite Crystals

本文对沸石晶体中强酸位的形成、结构和催化作用进行了研究。强酸性位点的浓度取决于模板分子去除步骤的条件。在该步骤中形成的氨和水影响形成步骤，因此，大气和斜坡速率影响浓度。它由两个Al原子组成。催化活性随强酸位点数目的增加而增加。此外，还研究了HZSM-5处理过的氨水中该位点的形成。场地由两个人工智能组成，一个在框架内，另一个在外部表面。在经酸处理的HZSM-5上，观察到表面类似但行为不同的强酸位点。氨的TPD不能区分它们。以NH_4Y为原料，经蒸制得到的USY（超稳定Y），经EDTA试剂处理后，具有较高的石蜡裂解活性。结果表明，高活性是由于羟基与Bronsted酸桥接而产生的。β-沸石具有很强的酸性位点，由缺陷源Al和邻近的Si-OH组成。

Following conclusions were drawn on the formation, structure and catalysis of very strong acid sites in zeolite crystals.1.Concentration of the very strong acid site depends on the conditions of template molecule removal step. Ammonia and water formed during the step affects the step of formation : therefore, the atmosphere and ramp rate influences the concentration. It consists of two Al atoms. Catalytic activities increase with increasing the number of the very strong acid site.2.Furthermore, the formation of the site was studied on the HZSM-5 treated wills ammonia water. The site consists of two Al, one Al in the framework and another on the external surface. Very strong acid site, which appeared as a similar one but behaved in a different manner, was observed on the HZSM-5 treated with acids. TPD of ammonia however could not discriminate between them.3.USY (Ultra-stable Y) prepared from NH_4Y by steaming, and further treated with EDTA reagent has a high activity in the paraffin cracking. It was revealed that the high activity was due to the created bridged OH with the Bronsted acidity.4.β-zeolite has the very strong acid site, consistitig of the defect-origin Al and neighbor Si-OH.