|
|||||
|
|
Dealumination of Y zeolite through an economic and eco-friendly defect-engineering strategy |
|
| Authors: | Peng Dong Jinyu Zhang Tiesen Li Chan Wang Jingdong Xu Tinghai Wang Yuanyuan Yue Lilong Jiang Xiaojun Bao |
| Affiliation: | 1. National Engineering Research Center of Chemical Fertilizer Catalyst, College of Chemical Engineering, Fuzhou University, Fuzhou, China Contribution: Formal analysis (equal), Investigation (equal), Visualization (lead), Writing - original draft (lead);2. National Engineering Research Center of Chemical Fertilizer Catalyst, College of Chemical Engineering, Fuzhou University, Fuzhou, China Contribution: Investigation (equal), Validation (equal), Visualization (supporting);3. National Engineering Research Center of Chemical Fertilizer Catalyst, College of Chemical Engineering, Fuzhou University, Fuzhou, China;4. National Engineering Research Center of Chemical Fertilizer Catalyst, College of Chemical Engineering, Fuzhou University, Fuzhou, China Qingyuan Innovation Laboratory, Quanzhou, China Contribution: Data curation (supporting), Formal analysis (equal), Funding acquisition (supporting), Supervision (supporting), Validation (equal);5. Sinochem Quanzhou Energy Technology Co., Ltd., Quanzhou, China Contribution: Data curation (supporting), Project administration (supporting), Validation (equal);6. National Engineering Research Center of Chemical Fertilizer Catalyst, College of Chemical Engineering, Fuzhou University, Fuzhou, China Qingyuan Innovation Laboratory, Quanzhou, China Contribution: Formal analysis (equal), Funding acquisition (supporting);7. Qingyuan Innovation Laboratory, Quanzhou, China |
| Abstract: | A sustainable defect-engineering strategy for the dealumination of Y zeolite is described. This strategy includes the green synthesis of a well-crystallized Y zeolite with point defects arising from the incorporation of Fe atoms by using Fe-containing perlite and the subsequent preparation of ultra-stable Y (USY) zeolite by efficient steaming dealumination. The systematic characterizations verify that Fe atoms originally existing in the perlite are incorporated into the as-synthesized Y zeolite and function as point defects, leading to the distortion of framework Al. The step-by-step investigation of dealumination process shows that vacancies are formed by the extraction of framework Fe in ammonium exchange, and the framework dealumination is promoted under the combined effect of the distorted framework Al and the formed vacancies during steaming treatment. The resulting USY zeolite owns excellent features in (hydro)thermal stability, pore structure and acid property, and exhibits outstanding catalytic performance in the cracking of n-octane and 1,3,5-triisopropylbenzene. |
| Keywords: | catalytic cracking dealumination defect engineering USY zeolite Y zeolite |