引用本文:
陈去非, 潘喜强, 赵振波, 杨向光. 合成方法对纳米Ce-Zr-Al高温稳定性及储氧性能的影响[J]. 应用化学,
2012, 29(11): 1297-1301.
doi:
10.3724/SP.J.1095.2012.20001
Citation: CHEN Qufei, PAN Xiqiang, ZHAO Zhenbo, YANG Xiangguang. Effect of Synthetic Method on Thermal Stability and Oxygen Storage Capacity of Ce-Zr-Al Nanocomposite[J]. Chinese Journal of Applied Chemistry, 2012, 29(11): 1297-1301. doi: 10.3724/SP.J.1095.2012.20001
Citation: CHEN Qufei, PAN Xiqiang, ZHAO Zhenbo, YANG Xiangguang. Effect of Synthetic Method on Thermal Stability and Oxygen Storage Capacity of Ce-Zr-Al Nanocomposite[J]. Chinese Journal of Applied Chemistry, 2012, 29(11): 1297-1301. doi: 10.3724/SP.J.1095.2012.20001
合成方法对纳米Ce-Zr-Al高温稳定性及储氧性能的影响
摘要:
采用柠檬酸溶胶凝胶、溶胶辅助共沉淀和溶胶共沉淀3种方法合成了不同Al掺杂的纳米CexZr1-xO2与Al2O3的复合体Ce-Zr-Al。用XRD、BET和H2-TPR表征了纳米Ce-Zr-Al复合体的抗烧结性与储氧性能,与未掺杂的铈锆固溶体相比,Al掺杂的纳米铈锆复合体的抗烧结性与储氧性能均有显著改善,柠檬酸溶胶凝胶法的最佳掺杂量为5倍Al(Al与CexZr1-xO2摩尔比),溶胶辅助共沉淀法最佳掺杂量为10倍Al,溶胶共沉淀法最佳掺杂量为5倍Al,其中,柠檬酸溶胶凝胶法合成的Ce-Zr-Al纳米复合物储氧量最高,为717.5 μmol/g-CeO2,占理论储氧量(即储氧效率)的49.3%。
English
Effect of Synthetic Method on Thermal Stability and Oxygen Storage Capacity of Ce-Zr-Al Nanocomposite
Abstract:
CeO2-ZrO2 solid solution is an indispensable oxygen storage material for the three way catalyst to control the pollution gas emission from automobiles.In this paper,three series of Ce-Zr-Al nanocomposite(ACZ) was prepared by citrate acid sol-gel method,sol assistant co-precipitation and sol co-precipitation,respectively.The obtained samples were calcinated at 1000℃ for 4 h to test the thermal stability and oxygen storage capacity(OSC).The effect of synthetic methods on these properties was investigated by means of X-ray diffraction(XRD),Brunauer Emmett Teller(BET) specific surface area(SSA) and H2 temperature-programmed reduction(H2-TPR).The results revealed that the thermal stability and oxygen storage capacity of all the ACZ were improved compared to the pure CeO2-ZrO2 solid solution.The molar proportion of Al doped in ACZ is 5,10,5 for citrate acid sol-gel method,sol assistant co-precipitation and sol co-precipitation,respectively.ACZ prepared by citrate acid sol-gel method had the highest oxygen storage capacity(717.5 μmol/g-CeO2),account for 49.3% of the theoretical maximum.
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Key words:
- Ce-Zr solid solution
- / nanocomposite
- / thermal stability
- / sol-gel method
- / oxygen storage capacity
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