Confined and in-situ zeolite synthesis: A novel strategy for defect reparation over dense Pd membranes for hydrogen separation
Confined and in-situ zeolite synthesis: A novel strategy for defect reparation over dense Pd membranes for hydrogen separation
复制标题
限域原位沸石合成：用于氢分离的致密钯膜缺陷修复的新策略
DOI：
10.1016/j.seppur.2017.04.035
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发表时间：
2017
影响因子：
8.6
通讯作者：
Sun Jian
中科院分区：
文献类型：
--
作者：
Yu Jiafeng;Zhang Jixin;Bao Chun;Li Hui;Xu Hengyong;Sun Jian
制备具有高渗透性能的超薄Pd基氢分离膜具有很大的工业应用潜力。然而，通常在减薄的厚度和高的氢渗透选择性之间存在权衡，这被认为是一对矛盾的要求。在这项研究中，提出了一种新的受限和原位合成分子筛修复缺陷的技术，以在不进一步增加膜厚度的情况下提高预制膜的氢渗透选择性。针对不同的缺陷尺寸，制定了两条工艺路线。沸石。只能在一种途径的大缺陷内生长，适合修复破碎的膜。在另一种方法中，在Pd膜表面形成一层薄薄的沸石层，覆盖了小的缺陷，以进一步提高选择性。经沸石修复后，渗透氢的纯度由99.884%提高到99.994%。用加氢从75%的氢气/氮气中分离出高纯度的氢(99.986%)，在500℃和0.4 Mpa的压力下，膜的回收率为91%
The manufacturing of ultrathin Pd based hydrogen separation membranes with high permeation performance.has great potential in industrial applications. However, there usually exists a trade-off between.reduced thickness and high hydrogen permselectivity which are regarded as a pair of contradictory.requirements. In this study, a novel technique of confined and in-situ zeolite synthesis for defects reparation.is proposed to improve the hydrogen permselectivity of preformed Pd membranes without further.increasing their thickness. Two technology routes are developed for different defect dimensions. Zeolites.can only grow inside large defects in one route, which is suitable for repairing broken membranes. In the.other route, a thin zeolite layer is formed on Pd membrane surface, covering small defects for further.enhancing selectivity. The purity of permeate hydrogen is enhanced from 99.884 to 99.994% after zeolite.reparation. High purity hydrogen (99.986%) can be separated from 75% H2/N2 mixture with a hydrogen.recovery of 91% by the repaired membrane at 500 C and 0.4 MPa