CuO/La2O3-Al2O3催化剂中CuO物种的迁移和高温固相反应

稀有金属, 2006, 30(3): 339-342. doi: 10.3969/j.issn.0258-7076.2006.03.018

CuO/La2O3-Al2O3催化剂中CuO物种的迁移和高温固相反应

杨晓东 ^1, , 何迈 ^2, , 方萍 ^3, , 肖珊美 ^4, , 罗孟飞 ^5,

1.浙江师范大学物理化学研究所,浙江省固体表面反应化学重点实验室,浙江,金华,321004;金华职业技术学院,浙江,金华,321017

2.浙江师范大学物理化学研究所,浙江省固体表面反应化学重点实验室,浙江,金华,321004

3.浙江师范大学物理化学研究所,浙江省固体表面反应化学重点实验室,浙江,金华,321004

4.金华职业技术学院,浙江,金华,321017

5.浙江师范大学物理化学研究所,浙江省固体表面反应化学重点实验室,浙江,金华,321004

基金项目: 国家高技术研究发展计划(863计划)(20473075)

关键词： CuO/La2O3-Al2O3 , XRD , Raman光谱 , TPR , 固相反应

Transference of CuO Species and Solid-Solid Interaction in CuO/La2O3-Al2O3 Catalyst

采用XRD、激光Raman光谱和TPR技术研究了CuO/La2O3-Al2O3催化剂中CuO高温迁移及固相反应.结果表明,800℃焙烧的CuO(20%)/La2O3(x%)-Al2O3催化剂,低La2O3负载量(5%和10%)时,La2O3(x%)-Al2O3载体表面即存在CuO和少量CuAl2O4;当La2O3负载量增大(≥20%)时,由于La2O3的阻止作用,使得CuO无法迁移到La2O3内层和Al2O3反应生成CuAl2O4,从而使CuO稳定存在于催化剂表层.高温焙烧(≥900℃),La2O3的隔离作用下降,从而导致生成CuAl2O4.

参考文献

[1]	Kim T W;Song M W;Koh H L et al.Surface properties and reactivity of Cu/γ-Al2O3 catalysts for NO reduction by C3H6 Influences of calcination temperatures and additives[J].Applied Catalysis A:General,2001,210:35.
[2]	Jiang X Y;Luo L P;Chen Y X et al.Effect of CuO/CeO2 and CuO/γ-Al2O3 catalysts on NO + CO reaction[J].Journal of Molecular Catalysis,2003,197:193.
[3]	Hievl R;Knozinger H;Urbach H P .Surface properties and reduction behavior of calcined CuO/Al2O3 and CuO-NiO/Al2O3 catalysts[J].Journal of Catalysis,1981,69(02):475.
[4]	Parvulescu V I;Grange P;Delmon B .Catalytic removal of NO[J].Catalysis Today,1998,46(04):233.
[5]	Friedman R M;Freeman J J;Lytle F W .Characterization of Cu/Al2O3 catalysts[J].Journal of Catalysis,1978,55:10.
[6]	Jurka B;Albin P;Djordje M et al.XPS and TPR examinations of γ-alumina-supported Pd-Cu catalysts[J].Applied Catalysis A:General,2001,206(01):113.
[7]	Shaheen WM. .Thermal solid-solid interaction and catalytic properties of CuO/Al2O3 system treated with ZnO andMoO(3)[J].Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems,2002(1/2):105-116.
[8]	Deraz NAM. .Surface and catalytic properties of Co3O4-doped CuO-Al2O3 catalysts[J].Colloids and Surfaces, A. Physicochemical and Engineering Aspects,2002(1/3):197-206.
[9]	罗来涛.La2O3对Ni-Mo/γ-Al2O3催化剂CO和CO2甲烷化的影响[J].中国稀土学报,1999(02):120.
[10]	姚义俊,丘泰,焦宝祥,沈春英.Y2O3, La2O3, Sm2O3对氧化铝瓷烧结及力学性能的影响[J].中国稀土学报,2005(02):158-161.
[11]	Luo MF;Fang P;He M;Xie YL .In situ XRD, Raman, and TPR studies of CuO/Al2O3 catalysts for CO oxidation[J].Journal of molecular catalysis, A. Chemical,2005(1/2):243-248.
[12]	Li C;Li M J .UV Raman spectroscopic study on the phase transformation of ZrO2,Y2O3-ZrO2 and SO42-/ZrO2[J].Journal of Raman Spectroscopy,2002,33:301.

上一张下一张

计量

下载量()
访问量()

作者相关

文章评分

您的评分：
1

0%
2

0%
3

0%
4

0%
5

0%

材料期刊网