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The Membrane Society of Korea (한국막학회)
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Preparation and Performance Analysis of Pd-Ag Alloy Hydrogen Membrane with GO/γ-Al2O3 Interlayers

그래핀 옥사이드와 감마 알루미나 중간층을 도입한 Pd-Ag 합금 수소 분리막 제조 및 성능 분석

  • Received : 2024.10.02
  • Accepted : 2024.10.24
  • Published : 2024.10.30
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Abstract

In this experimental, a GO/γ-Al2O3 intermediate layer was coated onto an α-Al2O3 support using vacuum coating and dip-coating methods, and a Pd-Ag membrane was fabricated via electroless plating. Pd and Ag were sequentially coated onto the support through electroless plating, followed by heat treatment at 500℃ for 18 h in an H2 atmosphere to form the alloy. The surface and cross-secsion of the fabricated membrane was observed using SEM and the thickness of the Pd-Ag membrane was measured to be 1.88 ㎛, while the thickness of the GO/γ Pd-Ag membrane was 1.07 ㎛. EDS analyses confirmed the formation of a Pd-Ag alloy with a composition of Pd-77% and Ag-23%. Gas permeation experiments were conducted with pure H2 and H2/N2 mixed gases. The maximum H2 flux of the Pd membrane was 0.53 mol/m2·s at 450℃ and 4 bar, whereas the Pd-Ag membrane exhibited a higher flux of 0.76 mol/m2·s under the same conditions. The separation factor in the H2/N2 mixed gas experiment was measured to be 2626 for the Pd membrane and 13,808 for the Pd-Ag membrane at 450℃ and 4 bar.

이 실험에서는 α-Al2O3 지지체 위에 진공 코팅(vacuum coating)과 딥 코팅(dip-coating) 기법을 사용하여 GO/γ-Al2O3 중간층을 형성하였고, 무전해도금 방식을 통해 Pd-Ag 수소 분리막을 제작하였다. Pd와 Ag는 각각 무전해도금을 통해 지지체 표면에 증착되었으며, 합금화를 위해 도금 과정 중 H2 분위기 하에서 500℃에서 18 h 동안 열처리를 진행하였다. 제조된 분리막의 표면과 단면은 SEM을 통해 분석되었으며, Pd-Ag 분리막의 두께는 1.88 ㎛, GO/γ-Al2O3 중간층을 가진 Pd-Ag 분리막의 두께는 1.07 ㎛로 측정되었다. EDS 분석을 통해 Pd-77%, Ag-23%의 조성으로 합금이 형성된 것을 확인하였다. 기체투과 실험은 H2 단일가스와 H2/N2 혼합가스를 이용하여 수행되었다. H2 단일가스 투과실험에서 450℃, 4 bar 조건하에서 Pd 분리막의 최대 H2 플럭스는 0.53 mol/m2·s로, Pd-Ag 분리막의 경우 0.76 mol/m2·s로 측정되었다. H2/N2 혼합가스 실험에서 측정된 분리막의 separation factor는 450℃, 4 bar 조건에서 Pd 분리막이 2626, Pd-Ag 분리막이 13808로 나타났다.

Keywords

Acknowledgement

본 결과물은 환경부의 재원으로 한국환경산업기술원의 대기환경 괸리기술 사업화 연계 기술개발사업의 지원을 받아 연구되었습니다.(과제번호: RE202103386, 과제명: 블루 수소충전소용 수소 정제분리 시스템 실증기술개발-Technology development of hydrogen purification membrane separation demonstration for blue hydrogen station)

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