A simultaneous precipitation/digestion method has been developed to precipitate a crystalline cerium (III) carbonate (Ce 2(CO 3) 3·8H 2O) by a controlled reaction between aqueous solutions of Ce(NO 3) 3·6H 2O and K 2CO 3 at room temperature. The nano-sized CeO 2 supports with crystallite size of 8.0 nm and high surface area of 131.6 m 2/g were successfully prepared through a decomposition of a cerium (III) carbonate at 400°C for 4 h. The digestion time was optimized to get highly active 1 wt.% Pt/CeO 2 catalyst for the water gas shift (WGS) reaction. 1 wt.% Pt/CeO 2 catalyst exhibited the highest CO conversion (82%) and 100% selectivity to CO 2 at 320°C at very high gas hourly space velocity (GHSV) of 45,625 h -1 if an optimized digestion time of 4 h was used for the synthesis of cerium (III) carbonate.
Bibliographical noteFunding Information:
This work was supported by the New & Renewable Energy Technology Development Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Knowledge Economy ( 2008-N-HY08-P-01 ). This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology ( 2010-0002521 ).
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