کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6685939 | 501871 | 2015 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of core and shell compositions on MeOx@LaySr1âyFeO3 core-shell redox catalysts for chemical looping reforming of methane
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
مهندسی انرژی و فناوری های برق
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Effect of core and shell compositions on MeOx@LaySr1âyFeO3 core-shell redox catalysts for chemical looping reforming of methane Effect of core and shell compositions on MeOx@LaySr1âyFeO3 core-shell redox catalysts for chemical looping reforming of methane](/preview/png/6685939.png)
چکیده انگلیسی
The chemical looping reforming (CLR) process converts methane into syngas through cyclic redox reactions of an active lattice oxygen (O2â) containing redox catalyst. In CLR, methane is partially oxidized to CO and H2 using the active lattice oxygen of a redox catalyst. In a subsequent step, the oxygen-deprived redox catalyst is regenerated by air. Such a process can eliminate the need for steam and/or oxygen in reforming, thereby improving methane conversion efficiency. A number of perovskite-structured mixed metal oxides are known to be active for CLR. However, the oxygen storage capacity of perovskites tends to be low, limiting their practical application in chemical looping. In contrast reducible metal oxides such as cobalt and iron oxides can store up to 30Â wt.% lattice oxygen but are less selective for syngas generation. We explore oxygen carriers that utilize the advantages of both perovskites and first-row transition metal oxides by integrating a transition metal oxide core with a mixed ionic-electronic conductive (MIEC) perovskite support/shell. MIEC perovskites facilitate countercurrent conduction of O2â and electrons, allowing facile O2â transport though the solid. It is proposed that this conduction allows rapid oxygen transport to and from the transition metal oxide cores irrespective of the porosity of the redox catalyst. In this work, we show that MeOx@LaySr1âyFeO3 can be an excellent model catalyst system for CLR. The activity, selectivity, and coke resistance of the core-shell system can be tuned by changing the ratio of La to Sr in the perovskite shell and the type of transition metal oxide in the core. Our studies indicate that lower Sr loadings can improve activity and selectivity of the catalyst for methane partial oxidation, but make the LSF shell less resistant to decomposition during the reduction step.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Energy - Volume 157, 1 November 2015, Pages 391-398
Journal: Applied Energy - Volume 157, 1 November 2015, Pages 391-398
نویسندگان
Luke Neal, Arya Shafiefarhood, Fanxing Li,