TY - JOUR
T1 - Different reaction mechanisms of ammonia oxidation reaction on Pt/Al2O3 and Pt/CeZrO2 with various Pt states
AU - Sun, Mengmeng
AU - Liu, Jingying
AU - Song, Chang
AU - Ogata, Yoshito
AU - Rao, Hanbing
AU - Zhao, Xiaoqing
AU - Xu, Haidi
AU - Chen, Yaoqiang
N1 - Funding Information:
The financial support for the study described in this article from National Natural Science Foundation Project in China under contract number 21802099.
Publisher Copyright:
© 2019 American Chemical Society.
PY - 2019/7/3
Y1 - 2019/7/3
N2 - NH3 emissions were limited strictly because of the threat for human health and sustainable development. Pt/Al2O3 and Pt/CeZrO2 were prepared by the impregnation method. Differences in surface chemical states, reduction ability, acid properties, morphological properties, reaction mechanisms, and ammonia oxidation activity were studied. It indicated that Pt species states were affected by different metal-support interactions. The homogeneously dispersed Pt species over Pt/Al2O3 exposed Pt(111) because of weak metal-support interactions; there even existed an obvious interface between Pt and Al2O3. While obscure even an overlapped interface was observed over Pt/ CeZrO2, resulting in the formation of PtO because of the oxygen migration from CeZrO2 to Pt species (confirmed by CO-FTIR, the cycled H2-TPR and transmission electron microscopy results). It was noteworthy that different reaction mechanisms were induced by different states of Pt species; NH was the key intermediate species for ammonia oxidation reaction over Pt/Al2O3, but two kinds of intermediates, N2H4 and HNO, were observed for Pt/CeZrO2.
AB - NH3 emissions were limited strictly because of the threat for human health and sustainable development. Pt/Al2O3 and Pt/CeZrO2 were prepared by the impregnation method. Differences in surface chemical states, reduction ability, acid properties, morphological properties, reaction mechanisms, and ammonia oxidation activity were studied. It indicated that Pt species states were affected by different metal-support interactions. The homogeneously dispersed Pt species over Pt/Al2O3 exposed Pt(111) because of weak metal-support interactions; there even existed an obvious interface between Pt and Al2O3. While obscure even an overlapped interface was observed over Pt/ CeZrO2, resulting in the formation of PtO because of the oxygen migration from CeZrO2 to Pt species (confirmed by CO-FTIR, the cycled H2-TPR and transmission electron microscopy results). It was noteworthy that different reaction mechanisms were induced by different states of Pt species; NH was the key intermediate species for ammonia oxidation reaction over Pt/Al2O3, but two kinds of intermediates, N2H4 and HNO, were observed for Pt/CeZrO2.
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U2 - 10.1021/acsami.9b02128
DO - 10.1021/acsami.9b02128
M3 - Article
C2 - 31179684
AN - SCOPUS:85069264412
SN - 1944-8244
VL - 11
SP - 23102
EP - 23111
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
IS - 26
ER -
