Hydrogen Production By Chemical Looping Steam Reforming of Methane over Mg Promoted Iron Oxygen Carrier

Rahimpour, M. R., Shiraz University

In the chemical looping reforming (CLR) process, methane is converted to hydrogen and carbon monoxide through cyclic reduction–oxidation reactions of fuel with active lattice oxygen (O2 ?) of an oxygen carrier. In this research, Mg promoted iron based oxygen carrier was used in the process. The response surface method (RSM) based on Box–Behnken design was applied to examine the operating conditions of chemical looping steam methane reforming process. Independent variables including reaction temperature (550–750 °C), Mg loading (0–10%) and oxygen carrier preparation method (co-impregnation and sequential impregnation methods) were selected for investigation and optimization of methane conversion, hydrogen production yield and CO/CO 2 molar ratio using RSM. The characterization of samples was accomplished by means of X-ray diffraction (XRD), N 2 adsorption–desorption (BET test) and trans- mission electron microscope (TEM). The Design expert software suggested several optimized solutions; among them, the best choice was 15Fe/5Mg/Al 2 O 3 oxygen carrier synthesized with sequential impregnation method at reaction temperature of 650 °C. However, 15Fe/5Mg/Al 2 O 3 oxygen carrier is consistently stable in chemical looping reforming with high hydrogen producing capacity over redox cycles.

[1] Holladay JD , Hu J , King DL , Wang Y . An overview of hydrogen production tech- nologies. Catal Today 2009;139(4):244–60 .

[2] Guzman F , Singh R , Chuang SSC . Direct Use of Sulfur-Containing Coke on a Ni-Yttria-Stabilized Zirconia Anode Solid Oxide Fuel Cell. Energy Fuels 2011;25(5):2179–86 .

[3] Bohn CD , Cleeton JP , Muller CR , Chuang SY , Scott SA , Dennis JS . Stabilizing iron oxide used in cycles of reduction and oxidation for hydrogen production. Energy & Fuels 2010;24(7):4025–33 .

[4] Dou B , Song Y , Wang C , Chen H , Yang M , Xu Y . Hydrogen production by enhanced-sorption chemical looping steam reforming of glycerol in moving- bed reactors. Appl Energy 2014;130:342–9 .

[5] Cormos C-C . Hydrogen production from fossil fuels with carbon capture and storage based on chemical looping systems. Int J Hydrogen Energy 2011;36(10):5960–71 .

[6] Bhosale RR , Kumar A , van den Broeke LJP , Gharbia S , Dardor D , Jilani M , et al. Solar hydrogen production via thermochemical iron oxide-iron sulfate water splitting cycle. Int J Hydrogen Energy 2015;40(4):1639–50 .

[7] Zhang B , Zhang L , Yang Z , Yan Y , Pu G , Guo M . Hydrogen-rich gas production from wet biomass steam gasification with CaO/MgO. Int J Hydrogen Energy 2015;40(29):8816–23 .

[8] Deniz I , Vardar-Sukan F , Yuksel M , Saglam M , Ballice L , Yesil-Celiktas O . Hy- drogen production from marine biomass by hydrothermal gasification. Energy Convers Manage 2015;96:124–30 .

[9] Wu W , Liou Y-C , Yang H-T . Design and evaluation of a heat-integrated hydro- gen production system by reforming methane and carbon dioxide. J. Taiwan Inst Chem. Eng 2013;44(6):929–35 .

[10] Parthasarathy P , Narayanan KS . Hydrogen production from steam gasification of biomass: influence of process parameters on hydrogen yield: A review. Re- new Energy 2014;66:570–9 .

[11] Steinfeld A , Kuhn P , Reller A , Palumbo R , Murray J , Tamaura Y . Solar-processed metals as clean energy carriers and water-splitters. Int J Hydrogen Energy 1998;23(9):767–74 .

[12] Pudukudy M , Yaakob Z , Mohammad M , Narayanan B , Sopian K . Renewable hy- drogen economy in Asia –Opportunities and challenges: an overview. Renew Sustain. Energy Rev 2014;2(30):743–57 .

[13] Dou B , Song Y , Wang C , Chen H , Xu Y . Hydrogen production from catalytic steam reforming of biodiesel byproduct glycerol: Issues and challenges. Renew. Sustain Energy Rev 2014;;2(30):950–60 .