Hydrogen iodide decomposition over nickel–ceria catalysts for hydrogen production in the sulfur–iodine cycle

Abstract In this work, pure CeO2 and three nickel–ceria catalysts prepared by different methods have been tested to evaluate their effect on hydrogen iodide (HI) decomposition in the sulfur–iodine (SI or IS) cycle at various temperatures. BET, XRD, HRTEM and TPR were performed for catalysts characterization. Indeed, the pure CeO2 also strongly enhance the decomposition of HI to H2 by comparison with blank yield. Nickel–ceria catalysts show better catalytic activity, especially Ni-doping-G sample. It is found that, through the sol-gel method, the Ni2+ ions have dissolved into the ceria lattice instead of the Ce4+ ions during the synthesis process of Ni-doping-G sample. Oxygen vacancies are formed because of the charge imbalance and lattice distortion in CeO2. The presence of Ni during the CeO2 synthesis process of Ni-doping-G also causes smaller average particle size, larger surface area, better thermal stability and better Ni dispersion than the Ni-loading samples. These provide nickel–ceria catalyst with a potential to be used in the SI cycle for HI decomposition.

[1]  Jean-Marc Borgard,et al.  Upper bound and best estimate of the efficiency of the iodine sulphur cycle , 2005 .

[2]  D. Weng,et al.  Influence of the oxidative/reductive treatments on the activity of Pt/Ce0.67Zr0.33O2 catalyst , 2005 .

[3]  J. Funk.  Thermochemical hydrogen production: past and present , 2001 .

[4]  S. Nakao,et al.  Silica Membrane Reactor for the Thermochemical Iodine-Sulfur Process To Produce Hydrogen , 2004 .

[5]  Kiyoshi Otsuka,et al.  Direct partial oxidation of methane to synthesis gas by cerium oxide , 1998 .

[6]  Gab-Jin Hwang,et al.  Simulation study on the catalytic decomposition of hydrogen iodide in a membrane reactor with a silica membrane for the thermochemical water-splitting IS process , 2001 .

[7]  Jianzhong Liu,et al.  Effect of preparation method on platinum-ceria catalysts for hydrogen iodide decomposition in sulfur-iodine cycle , 2008 .

[8]  Susumu Mizuta,et al.  Kinetics of the Catalytic Decomposition of Hydrogen Iodide in the Magnesium–Iodine Thermochemical Cycle , 1981 .

[9]  C. Guizard,et al.  Evaluation of sol–gel methods for the synthesis of doped-ceria environmental catalysis systems: Part II. Catalytic activity and resistance to thermal aging , 2001 .

[10]  Yuji Shindo,et al.  Kinetics of the catalytic decomposition of hydrogen iodide in the thermochemical hydrogen production , 1984 .

[11]  D. R. O'keefe,et al.  Catalysis research in thermochemical water-splitting processes , 1980 .

[12]  C. Yeh,et al.  Selective production of hydrogen from partial oxidation of methanol over silver catalysts at low temperatures. , 2004, Chemical communications.

[13]  Hirofumi Ohashi,et al.  A pilot test plan of the thermochemical water-splitting iodine-sulfur process , 2004 .

[14]  Jianzhong Liu,et al.  Thermal efficiency evaluation of open-loop SI thermochemical cycle for the production of hydrogen, sulfuric acid and electric power , 2007 .

[15]  Zhihua Wang,et al.  Detailed kinetic modeling and sensitivity analysis of hydrogen iodide decomposition in sulfur–iodine cycle for hydrogen production , 2008 .

[16]  John H. R. Schuster,et al.  Water splitting - A progress report , 1976 .

[17]  K. F. Knoche,et al.  Thermochemical water splitting through direct Hi-decomposition from H2O/HI/I2 solutions , 1989 .

[18]  Suttichai Assabumrungrat,et al.  Catalytic dry reforming of methane over high surface area ceria , 2005 .

[19]  Kefa Cen,et al.  Influence of the oxidative/reductive treatments on Pt/CeO2 catalyst for hydrogen iodide decomposition in sulfur–iodine cycle , 2008 .

[20]  Kefa Cen,et al.  Catalytic Thermal Decomposition of Hydrogen Iodide in Sulfur−Iodine Cycle for Hydrogen Production , 2008 .

[21]  Hengyong Xu,et al.  Effects of CeO2 addition on Ni/Al2O3 catalysts for the reaction of ammonia decomposition to hydrogen , 2008 .

[22]  Kaoru Onuki,et al.  A demonstration study on a closed-cycle hydrogen production by the thermochemical water-splitting iodine–sulfur process , 2004 .