Collaborative Research: Advanced Zeolite-Composite Adsorbents with Fine-Tuned Pore Sizes for Molecular Sieving Separations

合作研究：用于分子筛分离的具有微调孔径的先进沸石复合吸附剂

• 批准号: 1402772
• 负责人: Miao Yu
• 金额: $ 22.78万
• 依托单位: University of South Carolina at Columbia
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-07-01 至 2018-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1402772&HistoricalAwards=false
• 关键词: Collaborative; Research; Advanced; Zeolite; Composite

PI: Yu, Miao / Liang, XinhuaProposal Number: 1402772 / 1402122Title: Collaborative Research: Advanced Zeolite-Composite Adsorbents with Fine-Tuned Pore Sizes for Molecular Sieving Separations Mixture separation constitutes a large and costly component of industrial processes. Various separation technologies, such as distillation, extraction, adsorption, and membrane separation, have been developed to separate mixtures utilizing different properties of components in the mixture. Among these technologies, separation processes based on adsorption, such as pressure swing adsorption (PSA) and temperature swing adsorption (TSA), have been widely used in industry. Development of more energy-efficient adsorptive gas separation processes strongly depends on the development of improved porous adsorbents, and porous adsorbents with favorable adsorption isotherms and selectivity for the separation of interest are always the focus of adsorption-based separation processes. Zeolites are one of the most promising adsorbents that may realize true molecular-sieving separation under harsh separation conditions, attributing to their uniform, molecular-sized pores and high chemical, thermal and mechanical stabilities. Despite of a large selection pool of zeolites/molecular sieves and available techniques to adjust their pore sizes, not all desired pore sizes can be obtained for target separations, especially for separation of molecules with very close sizes, such as N2 (kinetic diameter: 0.364 nm)/CH4 (0.38 nm), O2 (0.346 nm)/N2, and paraffin/olefin. Therefore, it is highly desirable to develop new strategies to further fine-tune the pore sizes of zeolite-based materials and fill the pore size gaps between different zeolites. The goal of this proposed research is to fine-tune the pore entrance of zeolites by depositing ultrathin microporous coatings to achieve effective separation for industrially important mixtures that traditional zeolites have difficulty to separate. Ultrathin microporous coatings will be deposited using molecular layer deposition (MLD) on the zeolites to fill the pore-size gaps between different zeolites an obtain enhanced fundamental understanding of deposition mechanisms and coating interactions with zeolite substrates. Specifically, the objectives of the proposed research are: (1) To develop a reliable and reproducible MLD process to deposit ultrathin organic/inorganic hybrid films (with precisely controlled properties) on zeolite substrates and obtain a fundamental understanding on the factors that affect the quality of MLD coatings; (2) To elucidate and understand the decomposition of hybrid MLD coating and pore-generation mechanisms under different conditions; (3) To characterize effective pore sizes of zeolite-composite adsorbents and establish the fundamental coating property-pore entrance size relationship; and (4) To rationally design zeolite composite adsorbents with desired pore sizes and investigate separation performance for target mixtures. This completely new concept may lead to effective adsorptive separation of difficult-to-separate mixtures.This proposed research is expected to have great scientific as well as technological impact on the synthesis of nanostructured zeolite-composite adsorbents with fine-tuned pore sizes for mixture separations and potentially for selective catalysis. If successful, the project will greatly benefit adsorption-based separation processes. It will represent a significant advance in the rational design of zeolite-based adsorbents. The proposed research has significant practical implications on industrially important gas mixture separations. It is anticipated that this study could serve as a model for the rational design of advanced sorbents for adsorption-based separation processes.The PIs have specific defined plans to engage a broad range of students in learning about nanomaterials and molecular sieves. Specific opportunities for minorities will be funded through targeted scholarships and projects during the summer. Both PIs are active in outreach programs for K-12 students in mainly underrepresented populations in the areas of both universities.

pi：yu，miao / liang，Xinhuaproposal编号：1402772 / 14021222TITLE：协作研究：高级沸石 - 复合材料的吸附剂，具有细微调的孔径，用于分子筛分分离的分离分离构成大量和成本的工业流程。已经开发了各种分离技术，例如蒸馏，提取，吸附和膜分离，以利用混合物中的组件的不同特性分离混合物。在这些技术中，基于吸附的分离过程，例如压力摆动吸附（PSA）和温度摆动吸附（TSA），已广泛用于行业。开发更节能的吸附气体分离过程在很大程度上取决于改善的多孔吸附剂的发展，并且具有良好的吸附等温度和对分离兴趣分离的多孔吸附剂始终是基于崇拜的分离过程的重点。沸石是最有前途的吸附剂之一，可以在恶劣的分离条件下实现真正的分子蛋白蛋白分离，这归因于它们均匀的分子孔以及高化学，热和机械稳定性。 Despite of a large selection pool of zeolites/molecular sieves and available techniques to adjust their pore sizes, not all desired pore sizes can be obtained for target separations, especially for separation of molecules with very close sizes, such as N2 (kinetic diameter: 0.364 nm)/CH4 (0.38 nm), O2 (0.346 nm)/N2, and paraffin/olefin.因此，非常需要制定新的策略，以进一步微调基于沸石的材料的孔径，并填补不同沸石之间的孔径空隙。 这项拟议的研究的目的是通过沉积超薄微孔涂层来微调沸石的孔口，以实现传统沸石很难分离的工业重要混合物的有效分离。超薄微孔涂层将使用沸石上的分子层沉积（MLD）沉积，以填补不同沸石之间的孔径尺寸间隙。具体而言，拟议的研究的目标是：（1）开发可靠且可重复的MLD过程，以沉积超薄有机/无机杂交膜（具有精确控制的特性）对沸石底物上的沉积，并对影响MLD涂料质量的因素获得基本理解； （2）在不同条件下阐明和了解混合MLD涂料和孔产生机制的分解； （3）表征沸石复合材料吸附剂的有效孔径，并建立基本涂料的物业孔的入口关系； （4）至合理设计具有所需孔径的沸石复合吸附剂，并研究目标混合物的分离性能。这个全新的概念可能会导致难以分离混合物的有效吸附性分离。这项拟议的研究有望具有巨大的科学和技术影响，并对纳米结构的沸石复合材料的合成具有微调的孔隙，并具有微调的孔径，用于混合物分离，并有潜在的选择性催化性催化性。如果成功，该项目将极大地有益于基于吸附的分离过程。这将代表基于沸石的吸附剂的理性设计的重大进步。拟议的研究对工业重要的气体混合物分离具有重大实际意义。可以预料，这项研究可以作为用于基于吸附的分离过程的高级吸附剂的合理设计的模型。PIS具有特定的定义计划，以吸引广泛的学生学习纳米材料和分子筛子。少数民族将在夏季通过有针对性的奖学金和项目来资助少数民族的具体机会。这两种PI都活跃于两所大学领域中主要代表人群中的K-12学生的外展计划。