کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
55511 | 47056 | 2012 | 6 صفحه PDF | دانلود رایگان |
A simultaneous precipitation/digestion method has been developed to precipitate a crystalline cerium (III) carbonate (Ce2(CO3)3·8H2O) by a controlled reaction between aqueous solutions of Ce(NO3)3·6H2O and K2CO3 at room temperature. The nano-sized CeO2 supports with crystallite size of 8.0 nm and high surface area of 131.6 m2/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/CeO2 catalyst for the water gas shift (WGS) reaction. 1 wt.% Pt/CeO2 catalyst exhibited the highest CO conversion (82%) and 100% selectivity to CO2 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.
A simple simultaneous precipitation/digestion method has been developed to precipitate a crystalline cerium (III) carbonate (Ce2(CO3)3·8H2O) by a controlled reaction between aqueous solutions of Ce(NO3)3·6H2O and K2CO3 at room temperature. The nano-sized CeO2 supports with crystallite size of 8.0 nm and high surface area of 131.6 m2/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/CeO2 catalyst for the water gas shift (WGS) reaction. 1 wt.% Pt/CeO2 catalyst exhibited the highest CO conversion (82%) and 100% selectivity to CO2 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.Figure optionsDownload high-quality image (79 K)Download as PowerPoint slideHighlights
► A simultaneous precipitation/digestion method has been developed to obtain a crystalline Ce2(CO3)3·8H2O as a precursor of nano-sized CeO2 support.
► An optimum digestion time for the synthesis of Ce2(CO3)3·8H2O has been found to be 4 h.
► 1 wt.% Pt/CeO2 catalyst exhibited relatively stable activity even at the GHSV of 45,625 h−1 at 320 °C in WGS.
Journal: Catalysis Today - Volume 185, Issue 1, 20 May 2012, Pages 113–118