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( Annabathini Geetha Bhavani ),( Hyunki Youn ) 한국화학공학회 2018 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.56 No.2
All the Ni-Co-Ce-ZrO<sub>2</sub> mixed oxides are prepared by co-precipitations methods. Methanation of CO and H<sub>2</sub> reaction is screened tested over different fractions of cerium (2, 4, 7 and 12 wt.%) over Ni-Co/ZrO<sub>2</sub> bimetallic catalysts are investigated. The mixed oxides are characterized by XRD, CO-Chemisorption, TGA and screened methanation of CO and H2 at 360 °C for 3000 min on stream at typical ratio CO:H<sub>2</sub>=1:1. In Ni-Co/CeZrO<sub>2</sub> series 2 wt.% Ce loading catalyst shows most promising catalyst for CH<sub>4</sub> selectivity than CO<sub>2</sub>, which directs more stability with less coke formation. The high activity is attributed to the better bimetallic synergy and the well-developed crystalline phases of NiO, ZrO<sub>2</sub> and Ce-ZrO<sub>2</sub>. Other bimetallic mixed oxides NCoZ, NCoC<sup>4-12</sup>Z has faster deactivation with low methanation activity. Finally, 2 wt.% Ce loading catalyst was found to be optimal coke resistant catalyst.