Improved Low-Temperature Hydrogen Production from Aqueous Methanol Based on Synergism between Cationic Pt and Interfacial Basic LaOx

被引:4
作者
Mori, Kohsuke [1 ,2 ]
Shimoji, Yuki [1 ]
Yamashita, Hiromi [1 ,2 ]
机构
[1] Osaka Univ, Grad Sch Engn, 2-1 Yamadaoka, Suita, Osaka 5650871, Japan
[2] Osaka Univ, Inst Open & Transdisciplinary Res Initiat OTRI, Innovat Catalysis Sci Div, 2-1 Yamadaoka, Suita, Osaka 5650871, Japan
关键词
surface engineering; nanoparticle; lantunum oxide; methanol; reforming; FORMIC-ACID; CATALYST; WATER; DEHYDROGENATION; GENERATION; OXIDE; NANOPARTICLES; COMPLEX; CARRIER; ENERGY;
D O I
10.1002/cssc.202300283
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Aqueous phase reforming of methanol (APRM) is simple, inexpensive and provides a high hydrogen gravimetric density of 18.8 wt. %, and so is superior to traditional gas-phase reactions performed at relatively high temperatures. In the present work, the interface between Pt nanoparticles and a TiN support was modified using a highly dispersed amorphous LaOx phase. The resulting Pt/LaOx/TiO(N) exhibited enhanced activity and long-term stability during the APRM reaction under base-free conditions compared with Pt catalysts supported on unmodified TiN or crystalline La2O3. The interfacial amorphous LaOx phase promoted the deposition of small Pt nanoparticles having a narrow size distribution, and also generated electron-deficient Pt. An assessment of kinetic isotope data and theoretical investigations demonstrated that the cationic Pt nanoparticles facilitated the cleavage of O-H and C-H bonds in methanol while the amorphous LaOx enhanced the dissociation of water, thus enabling the water-gas shift reaction under mild conditions.
引用
收藏
页数:10
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