Fast screening of adsorbents: from equilibrium and kinetics to bench scale process tests

吸附剂的快速筛选：从平衡和动力学到小规模工艺测试

• 批准号: RGPIN-2016-04353
• 负责人: Eic, Mladen
• 金额: $ 2.04万
• 依托单位: University of New Brunswick
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=649960
• 关键词: Fast; screening; adsorbents; equilibrium; kinetics

The last several decades have have seen a dramatic increase in the development of new nanoporous adsorbents and catalysts. The most promising among them include molecular sieves, starting with microporous zeolites and carbon molecular sieve, which dominated the field until the last decade of the last century. Since the early 1990's a whole new array of other nanoporous materials have been developed including periodic mesoporous sieves (PMS), periodic mesoporous organosilicates (PMO's), hierarchycal zeolites, metal organic frameworks (MOF's) and a variety of hybrid and functionalized variants of these materials. Due to the large number of possible chemical compositions and structures of some of these materials, e.g., a near infinite number of MOF's can be made- each with different performance characteristics, there is a requirement for developing techniques to characterize materials rapidly using small sample quantities and allowing easy interpretation of the results. Adsorption equilibrium, kinetics and dynamic measurements have traditionally been carried out by gravimetric, volumetric and packed column flow techniques. These techniques are straightforward and accurate, but they are time consuming and require relatively large amounts of adsorbent samples (often in pelleted form) and are not well-suited to adsorbent rapid screening studies, where accuracy is less critical.***The original zero length (ZLC) techique was introduced by Eic and Ruthven in late 1980's to study adsorption kinetics. This technique will be the basis for developing a novel ZLC system designed for the fast screening of adsorbents that would include complete characterization from equilibrium and kinetics to dynamic (breakthrough) characterizations, which is the main objective of this proposal. The results will be used either to select the best performing material from a larger selction of potential adsorbents or it will be used to modify synthesized material in lab in order to produce tailor-made adsorbent for specific application.***The other objectives of the proposed research are:***1) Synthesis and modifications of synthesized adsorbents, in particular, synthesis of novel nanofibrilated cellulose (NFC) adsorbents for gas separations. This development has the potential to create a new market opportunities for the emerging forest bioeconomy. Since a large number of NFC samples will be prepared the synthesized/modified samples will be characterized by the fast screening methods developed in the first part of this proposal.***2) Performance of the selected samples will be tested by bench scale process testing using pressure swing adsorption (PSA) apparatus. These tests will complete a full cycle from the synthesis and rapid screening to the bench scale operation. ***The research proposed here is built on 25 years of our work in the adsorption area. **

过去几十年来，新型纳米多孔吸附剂和催化剂的开发急剧增加。其中最有前途的是分子筛，从微孔沸石和碳分子筛开始，直到上世纪最后十年，它们一直在该领域占据主导地位。自 1990 年代初以来，开发了一系列全新的其他纳米多孔材料，包括周期性介孔筛 (PMS)、周期性介孔有机硅酸盐 (PMO)、多级沸石、金属有机框架 (MOF) 以及这些材料的各种混合和功能化变体。由于其中一些材料有大量可能的化学成分和结构，例如，可以制造几乎无限数量的 MOF，每种材料都具有不同的性能特征，因此需要开发使用小样本量快速表征材料的技术并可以轻松解释结果。吸附平衡、动力学和动态测量传统上是通过重量分析、体积分析和填充柱流动技术进行的。这些技术简单、准确，但耗时且需要相对大量的吸附剂样品（通常为颗粒形式），并且不太适合精度不太重要的吸附剂快速筛选研究。***原始零长度 (ZLC) 技术由 Eic 和 Ruthven 在 1980 年代末引入，用于研究吸附动力学。该技术将成为开发新型 ZLC 系统的基础，该系统旨在快速筛选吸附剂，包括从平衡和动力学到动态（突破性）表征的完整表征，这是本提案的主要目标。结果将用于从更多潜在吸附剂中选择性能最佳的材料，或者用于在实验室中修改合成材料，以便生产适合特定应用的定制吸附剂。***该计划的其他目标拟议的研究有：***1）合成吸附剂的合成和改性，特别是用于气体分离的新型纳米原纤化纤维素（NFC）吸附剂的合成。这一发展有可能为新兴森林生物经济创造新的市场机会。由于将制备大量 NFC 样品，因此将通过本提案第一部分中开发的快速筛选方法对合成/修饰样品进行表征。***2) 所选样品的性能将通过小规模工艺测试进行测试采用变压吸附（PSA）装置。这些测试将完成从合成、快速筛选到小规模操作的完整周期。 ***此处提出的研究基于我们在吸附领域 25 年的工作。 **