Premium
Key Role of Lanthanum Oxychloride: Promotional Effects of Lanthanum in NiLaO y /NaCl for Hydrogen Production from Ethyl Acetate and Water
Author(s) -
Xue Zhiwei,
Shen Yuesong,
Li Peiwen,
Zhang Yu,
Li Junjie,
Qin Bin,
Zhang Jin,
Zeng Yanwei,
Zhu Shemin
Publication year - 2018
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201800927
Subject(s) - hydrogen production , lanthanum , lanio , catalysis , inorganic chemistry , ethyl acetate , chemistry , hydrogen , materials science , organic chemistry , optoelectronics , dielectric , ferroelectricity
The hydrogen economy is accelerating technological evolutions toward highly efficient hydrogen production. In this work, the catalytic performance of NiO/NaCl for hydrogen production via autothermal reforming of ethyl acetate and water is further improved through lanthanum modification, and the resulted 3%‐NiLaO y /NaCl catalyst achieves as high as 93% H 2 selectivity and long‐term stability at 600 °C. The promoting effect is caused by the strong interactions between lanthanum and NiO/NaCl, by which LaNiO 3 and a novel LaOCl phase are formed. The key role of LaOCl in promoting low‐temperature hydrogen production is highlighted, while effects of LaNiO 3 are well known. The LaOCl (010) facet possesses high adsorption capacity toward co‐chemisorbing ethyl acetate and water. LaOCl strongly interacts with ethyl acetate and H 2 O in the form of hydrogen bonding and coordination effect. The interactions induce tensions inside ethyl acetate and H 2 O, activate the molecules, and hence decrease the energy barrier for reaction. In situ Fourier transform infrared spectroscopy (FTIR) reveals that LaOCl along with NaCl enhances the adsorption ability of NiO/NaCl. Moreover, LaOCl improves the dispersion of Ni species in NiO–LaNiO 3 –LaOCl nanosheets, which possess abundant active sites. The effects together promote hydrogen evolution. Furthermore, the NiLaO y /NaCl catalyst can be easily reborn after deactivation due to the water solubility of NaCl.