کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7709159 | 1497328 | 2017 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of elevated temperatures and contaminated hydrogen gas mixtures on novel ultrathin palladium composite membranes
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Effects of elevated temperatures and contaminated hydrogen gas mixtures on novel ultrathin palladium composite membranes Effects of elevated temperatures and contaminated hydrogen gas mixtures on novel ultrathin palladium composite membranes](/preview/png/7709159.png)
چکیده انگلیسی
Transmembrane hydrogen flux of a novel 1â¯Î¼m palladium membrane, supported by a nickel microstructured support grid, is characterized when exposed to carbon dioxide, carbon monoxide and water vapor over a range of temperature from 235° to 320â¯Â°C. At all temperatures, the palladium membrane is found to be primarily hydrogen transport rate limited due to surface reactions, not atomic hydrogen solution-diffusion though the bulk palladium membrane. Hydrogen flux decreases rapidly as contaminate gas concentration increases, before reaching a temperature dependent steady state, due to nearly complete surface coverage of the palladium by adsorbed contaminate. Carbon monoxide and carbon dioxide have the largest impact, while water vapor has a lesser impact. The likely source of deactivation is the blocking of surface active sites by adsorbed contaminate molecules. Independent of contaminate gas effects, this study reveals a permanent hydrogen flux decrease due to diffusion of nickel from the microstructured support grid into the palladium membrane at temperatures above 360â¯Â°C.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 42, Issue 49, 7 December 2017, Pages 29310-29319
Journal: International Journal of Hydrogen Energy - Volume 42, Issue 49, 7 December 2017, Pages 29310-29319
نویسندگان
Zachary W. Dunbar, Ivan C. Lee,