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 | 15310
- 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