Bridging Dealumination and Desilication for the Synthesis of Hierarchical MFI Zeolites. Issue 41 (1st September 2017)

• Record Type: Journal Article
• Authors: Yang, Shitu; Yu, Chenxi; Yu, Lili; Miao, Shu; Zou, Mingming; Jin, Changzi; Zhang, Dazhi; Xu, Longya; Huang, Shengjun
• Is Part Of: Angewandte Chemie international edition. Volume 56:Issue 41(2017)
• Page Start: 12553
• Page End: 12556
• Publication Date: 2017-09-01
• Subjects: aluminum -- dealumination -- desilication -- mesoporous materials -- zeolites; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201706566
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: The rational design of zeolite‐based catalysts calls for flexible tailoring of porosity and acidity beyond micropore dimension. To date, dealumination has been applied extensively as an industrial technology for the tailoring of zeolite in micropore dimension, whereas desilication has separately shown its potentials in the creation of mesoporosities. The free coupling of dealumination with desilication will bridge the tailoring at micro/mesopore dimensions; however, such coupling has been prevailingly confirmed as an impossible mission. In this work, a consecutive dealumination–desilication process enables the introduction of uniform intracrystalline mesopores (4–6 nm) into the microporous Al‐rich zeolites. The decisive impacts of steaming step have been firstly discovered. These findings revitalize the functions of dealumination in porosity tailoring, and stimulate the pursuit of new methods for the tailoring of industrially relevant Al‐rich zeolites. Abstract : Welding two processes : A consecutive dealumination–desilication process enables the introduction of uniform intracrystalline mesopores (4–6 nm) into microporous Al‐rich MFI zeolites. The development of hierarchical porosity depends on the steaming temperature, particle size, and interplay between dealumination and desilication conditions.