Catalysis by Ultra Strong Acid Sitcs in Zeotite Crystals

沸石晶体中超强酸性 SiTCs 的催化作用

• 批准号: 13450333
• 负责人: NIWA Miki
• 金额: $ 10.82万
• 依托单位: Tottori University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13450333/
• 关键词: Zeolite; Solid Acidity; Bronsted acid; Ammonia; Temperature Programmed Desorption; Infrared Spectroscopy; Paraffin; Catalytic Cracking; 超強酸点; アンモニアTPD; パラフィン分解; ZSM-5; モルデナイト; USY; 固体酸触媒; 塩酸処理; 塩基処理; 骨格外A1

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.

对沸石晶体中强酸位点的形成、结构和催化作用得出以下结论： 1.强酸位点的浓度取决于模板分子去除步骤的条件。该步骤中形成的氨和水影响形成步骤：因此，气氛和升温速率影响浓度。它由两个铝原子组成。催化活性随着强酸位点数量的增加而增加。2.进一步对HZSM-5处理的氨水进行了强酸位点形成的研究。该位点由两个 Al 组成，一个 Al 在框架中，另一个在外表面上。在用酸处理的 HZSM-5 上观察到非常强的酸位点，其外观相似，但表现不同。 3.以NH_4Y为原料，经汽蒸制备的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，高活性是由于产生了具有布朗斯台德酸性的桥接OH。4.β-沸石具有很强的酸性位，由缺陷源Al和邻近的Si-OH组成。

项目成果

N.Katada et al.: "Acidic Property of Modified Ultra Stable Y Zeolite : Increase in Catalytic Activity for Alkane Cracking with Ethylenediaminetetra-"Journal of Molecular Catalysis, A : Chemical. 211. 119-130 (2004)

N.Katada 等人：“改性超稳定 Y 型沸石的酸性特性：提高乙二胺四烷烃裂解的催化活性”-《分子催化杂志》，A：化学。

丹羽 幹, 西川慎治, 片田直伸: "アンモニアのIR-TPD法によるβゼオライトのキャラクタリゼーション"触媒. 46(2)(印刷中). (2004)

Miki Niwa、Shinji Nishikawa、Naonobu Katada：“通过氨 IR-TPD 方法表征 β-沸石”46(2)（出版中）。

Kazu Okumura, Miki Niwa: "Acid properties and catalysis of MCM-22 with different Al concentration"J. Catal.. 206. 23-28 (2002)

Kazu Okumura，Miki Niwa：“不同Al浓度MCM-22的酸性质及催化作用”J。

丹羽 幹, 西川慎治, 片田直伸: "アンモニアのIR-TPD法によるβゼオライトのキャラクタリゼーション"触媒. 46(2). 100-102 (2004)

Miki Niwa、Shinji Nishikawa、Naonobu Katada：“通过氨 IR-TPD 方法表征 β-沸石”催化剂 46(2)。

A.Kohara et al.: "Very Strong Acid Site in HZSM-5 formed during the Template Removal Step"Stud.Surf.Sci.Catal.. 135(CD). 341-341 (2001)

A.Kohara 等人：“HZSM-5 中在模板去除步骤中形成的强酸位点”Stud.Surf.Sci.Catal.. 135(CD)。