Abstract
Although hydrogen sulfide (H2S) was always a negative factor leading to the reduction of hydrogen permeability of palladium (Pd) membranes, its proper application could result in a positive effect. In this study, pure Pd membranes were firstly reacted with H2S at 23–450 °C, and then treated by redox reactions. Afterwards, the hydrogen permeability was tested under different reaction conditions using a hydrogen penetrant testing device. Moreover, both products and morphology changes occurred on the Pd membrane surface were analyzed using XRD, XPS and SEM. The results showed that H2S was dissociated to produce sulfides at 23 °C. With a rise of temperature, a regular change took place in the reaction products, morphology of the Pd membrane surface and hydrogen permeability. Adsorbed impurities such as sulfides and free carbon on the Pd membrane surface were removed by the redox treatment. The hydrogen permeability was improved by about 80% for the Pd membrane material subjected to the treatment method stated the above against the untreated one.
Highlights
Hydrogen energy is a major clean energy source [1], widely used in new energy vehicles, aerospace and other fields [2]
The Effect of Redox Reaction on the Pd Membrane Surface Affected by Hydrogen Sulfide
Pd surface that might hydrogen be produced as micro-cracks occurred sulfides on the Pdinto membrane surface hydrogen was not poisoned by hydrogen sulfide. It was found from J7–J11 that after the Pd membrane that had reacted with hydrogen sulfide at different temperatures reacted with oxygen at 500 °C, its stable permeation flux was not restored but rather exceeded the stable permeation flux of the Pd membrane which was not reacted chemically
Summary
Hydrogen energy is a major clean energy source [1], widely used in new energy vehicles, aerospace and other fields [2]. The hydrogen permeation rate of Pd membrane was greatly affected in the effects on impurities as oil, sulfides and arsenides [9,10]. It showed the maximum fragility and sensibility in sulfides even if these sulfides were extremely low in content [11]. Further demonstrates approachthat thatthe thesulfides sulfidesabsorbed absorbed on on palladium membrane surface, and further demonstrates ananapproach surface can It was found by by hydrogen permeation testing that that this can be beremoved removedby bythe theredox redoxmethod.
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