عنوان المقالة:Synthesis of ammonia directly from wet nitrogen using a redox stable La0.75Sr0.25Cr0.5Fe0.5O3−δ–Ce0.8Gd0.18Ca0.02O2−δ composite cathode Synthesis of ammonia directly from wet nitrogen using a redox stable La0.75Sr0.25Cr0.5Fe0.5O3−δ–Ce0.8Gd0.18Ca0.02O2−δ composite cathode
إبراهيم علي أحمد عمار | Ibrahim Ali Ahmed Amar | 13551
نوع النشر
مجلة علمية
المؤلفون بالعربي
Ibrahim A. Amar, Rong Lan, Shanwen Tao
المؤلفون بالإنجليزي
Ibrahim A. Amar, Rong Lan, Shanwen Tao
الملخص الانجليزي
Ammonia was directly synthesised from wet nitrogen at an intermediate temperature (375–425 °C) based on the oxygen-ion conduction of the Ce0.8Gd0.18Ca0.02O2−δ–((Li/Na/K)2CO3) composite electrolyte. A redox stable perovskite-based catalyst, La0.75Sr0.25Cr0.5Fe0.5O3−δ (LSCrF), was synthesised via a combined EDTA–citrate complexing sol–gel process to be used as a component of the La0.75Sr0.25Cr0.5Fe0.5O3−δ–Ce0.8Gd0.18Ca0.02O2−δ composite cathode for ammonia synthesis. Ammonia formation was studied at 375, 400 and 425 °C and a maximum ammonia formation rate of 4.0 × 10−10 mol s−1 cm−2 with corresponding Faradaic efficiency of 3.87% was observed at 375 °C when the applied voltage was 1.4 V. This is much higher than 7.0 × 10−11 mol s−1 cm−2 at 1.4 V and 400 °C when Cr-free Sr-doped LaFeO3−δ, La0.6Sr0.4FeO3−δ was used as the catalyst for the electrochemical synthesis of ammonia, indicating LSCrF is potentially a better catalyst. Ammonia was successfully synthesised using a redox stable cathode with higher formation rates at reduced temperature. Introduction of Cr3+ ions at the B-site of doped LaFeO3 improves both the chemical stability and catalytic activity for ammonia synthesis
تاريخ النشر
23/04/2015
الناشر
RSC dvances
رقم المجلد
5
رقم العدد
ISSN/ISBN
2046-2069
رابط DOI
10.1039/c5ra00600g
الصفحات
38977
رابط الملف
تحميل (416 مرات التحميل)
رابط خارجي
https://pubs.rsc.org/en/content/articlehtml/2015/ra/c5ra00600g
الكلمات المفتاحية
Ammonia synthesis
رجوع