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author:

Du, M. (Du, M..) [1] | Guo, L. (Guo, L..) [2] | Ren, H. (Ren, H..) [3] | Tao, X. (Tao, X..) [4] | Li, Y. (Li, Y..) [5] | Nan, B. (Nan, B..) [6] | Si, R. (Si, R..) [7] | Chen, C. (Chen, C..) [8] | Li, L. (Li, L..) [9]

Indexed by:

Scopus

Abstract:

Ammonia has the advantages of being easy to liquefy, easy to store, and having a high hydrogen content of 17.3 wt%, which can be produced without COx through an ammonia decomposition using an appropriate catalyst. In this paper, a series of FeCr bimetallic oxide nanocatalysts with a uniform morphology and regulated composition were synthesized by the urea two-step hydrolysis method, which exhibited the high-performance decomposition of ammonia. The effects of different FeCr metal ratios on the catalyst particle size, morphology, and crystal phase were investigated. The Fe0.75Cr0.25 sample exhibited the highest catalytic activity, with an ammonia conversion of nearly 100% at 650 °C. The dual metal catalysts clearly outperformed the single metal samples in terms of their catalytic performance. Besides XRD, XPS, and SEM being used as the means of the conventional characterization, the local structural changes of the FeCr metal oxide catalysts in the catalytic ammonia decomposition were investigated by XAFS. It was determined that the Fe metal and FeNx of the bcc structure were the active species of the ammonia-decomposing catalyst. The addition of Cr successfully prevented the Fe from sintering at high temperatures, which is more favorable for the formation of stable metal nitrides, promoting the continuous decomposition of ammonia and improving the decomposition activity of the ammonia. This work reveals the internal relationship between the phase and structural changes and their catalytic activity, identifies the active catalytic phase, thus guiding the design and synthesis of catalysts for ammonia decomposition, and excavates the application value of transition-metal-based nanocomposites in industrial catalysis. © 2023 by the authors.

Keyword:

ammonia decomposition COx-free hydrogen FeCr bimetallic oxide XAFS

Community:

  • [ 1 ] [Du M.]Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201204, China
  • [ 2 ] [Du M.]Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201210, China
  • [ 3 ] [Du M.]University of Chinese Academy of Sciences, Beijing, 100049, China
  • [ 4 ] [Guo L.]Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201210, China
  • [ 5 ] [Ren H.]National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Gongye Road 523, Fuzhou, 350002, China
  • [ 6 ] [Tao X.]Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201204, China
  • [ 7 ] [Li Y.]Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201204, China
  • [ 8 ] [Nan B.]Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201210, China
  • [ 9 ] [Si R.]Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201204, China
  • [ 10 ] [Chen C.]National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Gongye Road 523, Fuzhou, 350002, China
  • [ 11 ] [Li L.]Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201204, China
  • [ 12 ] [Li L.]Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201210, China

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Source :

Nanomaterials

ISSN: 2079-4991

Year: 2023

Issue: 7

Volume: 13

4 . 4

JCR@2023

4 . 4 0 0

JCR@2023

ESI HC Threshold:49

JCR Journal Grade:2

CAS Journal Grade:3

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count: 4

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 1

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