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Synthesis of AFX Type Zeolite Membrane for Separating Dilute CO2 by Molecular Sieve Mechanism

Research Project

Project/Area Number 22K19864
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 64:Environmental conservation measure and related fields
Research InstitutionNagaoka University of Technology

Principal Investigator

Himeno Shuji  長岡技術科学大学, 工学研究科, 准教授 (60334695)

Project Period (FY) 2022-06-30 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2023: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2022: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Keywordsゼオライト膜 / CO2分離
Outline of Research at the Start

大気中の二酸化炭素(CO2)を直接回収して利用する技術全世界で鋭意研究されている。しかし、大気中の窒素(N2)と酸素(O2)分子(0.36nm)とCO2分子(0.32nm)は分子径が0.03nmしか違わず、CO2分子と完全に分離可能な膜は存在しない。CO2とN2、O2の間の細孔(0.34-0.35 nm)を有するゼオライトを膜化すれば、「分子ふるい」で空気中からCO2を完全に分離可能である。

Outline of Final Research Achievements

In this study, we focused on zeolite membranes that can separate CO2 and N2 efficiently from CO2 and N2 mixed gas such as combustion exhaust gas, which can save energy and cost. The AFX zeolite is an oxygen 8-membered ring zeolite with pores of 0.34 nm × 0.36 nm and has a pore diameter intermediate between the molecular system of CO2 and N2, so it can be separated by the molecular sieving effect and the separation membrane As expected.We developed AFX zeolite membrane and evaluated CO2 / N2 permeation performance. First, it was clarified that high purity AFX zeolite can be synthesized by using FAU zeolite with Si / Al = 15 by crystal synthesis using zeolite conversion method.
In AFX zeolite membrane synthesis, zeolite conversion method is adapted to membrane synthesis, and zeolite membrane that exhibits molecular sieving effect can be synthesized under the conditions of SDA / SiO2 = 0.15, NaOH / SiO2 = 0.8, H2O / SiO2 = 43, synthesis time 96h It was revealed.

Academic Significance and Societal Importance of the Research Achievements

温室効果ガス排出量実質ゼロを目指し二酸化炭素(CO2)を回収して利用する技術が革新的技術として全世界で鋭意研究されている。しかし、大気中の窒素(N2)、酸素(O2)分子(0.36nm)とCO2分子(0.32nm)は分子径が0.03nmしか違わず、CO2分子と完全に分離可能な膜は存在しない。大気中主成分であるN2とCO2を分離可能と考えられるAFX型ゼオライト(AFX)を膜化し、N2分子を分離可能とすることは新規高性能分離素材の探究に加え、世界的な緊急課題であるCO2分子の分離・回収の新しい学術分野の創成に貢献できる。

Report

(3 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report

URL: 

Published: 2022-07-05   Modified: 2025-01-30  

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