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1.发明授权公开(公告)号：US11554348B2
公开(公告)日：2023-01-17
申请号：US16348819
申请日：2017-06-09
Applicant: NANJING UNIVERSITY OF TECHNOLOGY
Inventor： Xuehong Gu , Xun Yao , Li Peng
IPC: B01D67/00 , B01D71/02 , C01B39/24 , C01B39/26 , C01B39/40 , C01B39/54 , B01D69/12 , B01D69/08 , C02F1/44 , B01D69/02
Abstract: The invention relates to a method for preparing a hierarchical porous zeolite membrane and an application thereof, comprising the following steps: a mesoporous structure-directing agent is added to limit the growth of zeolite crystals, and self-assembled in the crystallization process to generate a mesoporous structure. Based on a seed crystal induced secondary nucleation mechanism, this method can realize one-step hydrothermal synthesis of hierarchical porous zeolite membrane with the advantages of mild and controllable synthesis conditions, simple process, good repeatability, reduced energy consumption and cost savings. The hierarchical porous zeolite membrane prepared by the method has good cut-off performance, and the cut-off molecular weight is adjustable between 200 to 500,000 Da.
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公开(公告)号：US10427107B2
公开(公告)日：2019-10-01
申请号：US14898472
申请日：2014-05-09
Applicant: NANJING UNIVERSITY OF TECHNOLOGY
Inventor： Xuehong Gu , Dezhong Liu , Zhenzhou Shi , Chun Zhang , Xuerui Wang
Abstract: The invention relates to a high-strength hollow fiber zeolite membrane and its preparation method, characterized in that the support of the high-strength zeolite membrane has a multi-channel hollow fiber configuration. The preparation method comprises first preparing a crystal seed solution, then immersing the dry support with the multi-channel hollow fiber configuration in the crystal seed solution, and extracting and drying the support to obtain a crystal-seeded support; and finally placing the crystal-seeded support in a zeolite membrane synthetic fluid, performing hydrothermal synthesis, and taking out, washing and drying the product to obtain the high-strength hollow fiber zeolite membrane. The multi-channel hollow fiber support can provide high mechanical property, which greatly reduces the depreciation rate of the hollow fiber zeolite membrane equipment during use. Meanwhile, the multi-channel hollow fiber zeolite membrane prepared by the Invention possesses high loading density of permeation flux and membrane module and can reduce the production cost and improve the separation efficiency significantly, and thus lays the foundation for promoting the industrial application of the hollow fiber zeolite membrane.
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公开(公告)号：US11278846B2
公开(公告)日：2022-03-22
申请号：US16470230
申请日：2017-06-09
Applicant: Nanjing University of Technology
Inventor： Xuehong Gu , Lin Wang , Chun Zhang
Abstract: Provided is a method for preparing a defect-free DDR molecular sieve membrane. Sigma-1 molecular sieve is used as an inducing seed crystal to prepare and obtain a continuous and compact DDR molecular sieve membrane on the surface of a porous ceramic support. An ozone atmosphere or an external field assisted technology is used to remove a template in the pores of the molecular sieve membrane at a low temperature. The invention avoids the formation of intercrystal defects and cracks, an activated DDR molecular sieve membrane has a good selectivity for separating CO2, and the membrane preparation time is significantly reduced.
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