TY - JOUR
T1 - Low concentration methane combustion over bimetallicPd-Ce/Al2O3 catalysts
AU - Liang, Wen Jun
AU - Shi, Xiu Juan
AU - Deng, Wei
AU - Li, Jian
AU - He, Hong
N1 - Publisher Copyright:
© 2017, Editorial Board of China Environmental Science. All right reserved.
PY - 2017/7/20
Y1 - 2017/7/20
N2 - Bimetallic Pd-Ce/γ-Al2O3 series catalysts were prepared by impregnation method in our experiment. Effects of the catalysts performance on the low concentration methane catalytic combustion were investigated. Structures and chemical properties of the catalysts were characterized and analyzed by scanning electron microscopy (SEM), N2 adsorption/desorption isotherms and H2-temperature programmed reduction (H2-TPR). Effects of different calcination temperature and additive dosage on catalytic activities were studied; the catalytic activity of the recycling catalysts was investigated at the same time.The results showed that the optimal calcination temperature was 550℃, the highest efficiency difference of about 40% at the same catalytic temperature. Compared with the single metal catalyst, bimetallic catalyst was benefit to improve the catalytic activity, but the catalytic effect was not obvious. However, the catalytic activity could be improved significantly when being used for many times, compared with the first experiment, the catalytic efficiency of the highest difference of about 50%. The probably reason were that the synergistic effects between PdO and CeO2 could be strengthen, the dispersion of the PdO could be improved, and the desorption energy of the adsorption oxygen could be reduced, all of which enhanced the catalyst activity.
AB - Bimetallic Pd-Ce/γ-Al2O3 series catalysts were prepared by impregnation method in our experiment. Effects of the catalysts performance on the low concentration methane catalytic combustion were investigated. Structures and chemical properties of the catalysts were characterized and analyzed by scanning electron microscopy (SEM), N2 adsorption/desorption isotherms and H2-temperature programmed reduction (H2-TPR). Effects of different calcination temperature and additive dosage on catalytic activities were studied; the catalytic activity of the recycling catalysts was investigated at the same time.The results showed that the optimal calcination temperature was 550℃, the highest efficiency difference of about 40% at the same catalytic temperature. Compared with the single metal catalyst, bimetallic catalyst was benefit to improve the catalytic activity, but the catalytic effect was not obvious. However, the catalytic activity could be improved significantly when being used for many times, compared with the first experiment, the catalytic efficiency of the highest difference of about 50%. The probably reason were that the synergistic effects between PdO and CeO2 could be strengthen, the dispersion of the PdO could be improved, and the desorption energy of the adsorption oxygen could be reduced, all of which enhanced the catalyst activity.
KW - Bimetallic catalysts
KW - Catalytic combustion
KW - Low concentration methane
KW - Pd-Ce/γ-AlO
UR - http://www.scopus.com/inward/record.url?scp=85031287522&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:85031287522
SN - 1000-6923
VL - 37
SP - 2520
EP - 2526
JO - Zhongguo Huanjing Kexue/China Environmental Science
JF - Zhongguo Huanjing Kexue/China Environmental Science
IS - 7
ER -