|K-supported catalysts for diesel soot combustion: Making a balance between activity and stability|
|Li; Qian; Wang; Xiao; Chen; Hui; Xin; Ying; Tian; Guangkai; Lu; Chenxi; Zhang; Zhaoliang; Zheng; Lirong; Zheng; Lei; Zheng LR(郑黎荣); Zheng L(郑雷)
|摘要||Two typical K-supported oxides (K/Al2O3 and K/TiO2) were selected as catalysts for diesel soot combustion in order to evaluate the relationship between activity and stability. The surface species were first characterized by X-ray powder diffraction (XRD), X-ray absorption fine-structure (XAFS), infrared analysis (IR), X-ray photoelectron spectroscopy (XPS), in situ IR of CO2 adsorption and temperature-programmed desorption of CO2 (CO2-TPD). Then the activity was studied by temperature-programmed oxidation (TPO), temperature-programmed reduction with soot (Soot-TPR) and in situ IR of soot combustion reactions. Lastly, the stability of the catalyst was checked by washing with water and analysis for K. This showed that K/TiO2 displayed negligible activity due to the immobilization of K+ ions in TiO2 to form K2Ti6O13. However, K/Al2O3 exhibited superior activity owing to the presence of active free K+ ions on the surface. The downside is the leaching of K+ ions into the effluent containing some water vapor, resulting in its poor stability - the other side of the coin for the highly active free K species. One of the suggested strategies for making a balance between activity and stability is encapsulating active K species in the channel of the catalyst as demonstrated by the tunneled cryptomelane. © 2015 Elsevier B.V.|
Diesel soot combustion
Temperature programmed oxidation
X ray absorption fine structures
|WOS类目||451.1 Air Pollution Sources
; 452.3 Industrial Wastes
; 521.1 Fuel Combustion
; 641.1 Thermodynamics
; 711 Electromagnetic Waves
; 801 Chemistry
; 802.3 Chemical Operations
; 803 Chemical Agents and Basic Industrial Chemicals
; 804 Chemical Products Generally
; 921.6 Numerical Methods
; 931 Classical Physics
; Quantum Theory
; 931.3 Atomic and Molecular Physics
; 951 Materials Science
; 961 Systems Science
Li,Qian,Wang,et al. K-supported catalysts for diesel soot combustion: Making a balance between activity and stability[J]. CATALYSIS TODAY,2015,264:171-179.
Li.,Qian.,Wang.,Xiao.,Chen.,...&郑雷.(2015).K-supported catalysts for diesel soot combustion: Making a balance between activity and stability.CATALYSIS TODAY,264,171-179.
Li,et al."K-supported catalysts for diesel soot combustion: Making a balance between activity and stability".CATALYSIS TODAY 264(2015):171-179.