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

초록

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°C 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 µm, while the thickness of the GO/γ Pd-Ag membrane was 1.07 µm. 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°C 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°C and 4 bar.

키워드