On the activity and stability of Pt-K/Al2O3 LNT catalysts for diesel soot and NOx abatement

Performance and properties of K and TiO2 based LNT catalysts

“…Unfortunately, the volatile nature of the active K species, due to the much lower melting point (334 °C) of KNO 3 , gives rise to technical challenges in avoiding loss of the active phase due to K volatilization, dissolution in water, and/or diffusion along with undesirable interactions with cordierite monolith supports [14,15]. Therefore, overcoming of K stability concerns is mandatory to its applicability in LNTs formulations.…”

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In this study Pt-K/TiO 2 LNT catalysts having different K loadings (2,5,10,15, 20 wt %) have been synthesized, characterized and tested, along with a Pt/K 2 Ti 6 O 13 reference material. The effects of K loading and thermal aging on NO x storage performance have been addressed, and the formation/decomposition of stored NO x species over Pt-free samples has been investigated by FT-IR, TPD and XRD techniques.

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Nanostructured platinum catalyst coating on diesel particulate filter with a low-cost electroless deposition approach

“…However Pt-based catalysts are rather expensive and are extremely sensitive to sulfur poisoning [12], which has become a major factor to impede its further implementation in fabrication of catalytic soot filter. In addition, conventional coating methods, such as impregnation [13,14] , GBMR [11] and sol-gel [15]often cause uneven load, poor dispersion and thermal unstable in harsh reaction conditions. Auxiliary apparatuses and protocols are needed to implant solid catalyst within porous materials.…”

Performance and Stability of Wet-Milled CoAl2O4, Ni/CoAl2O4, and Pt,Ni/CoAl2O4 for Soot Combustion

“…Un-catalyzed soot combustion occurs at around 600 • C, and, therefore, a catalyst is added to reduce this temperature below that of diesel exhausts, in the range from 260 to 540 • C [1,8,9]. Noble metals, such as Pt, achieve high catalytic activity by oxidizing the NO present in the exhaust gas to NO 2 , which promotes soot combustion [10,11]. The remaining challenges are to avoid filter thermal regeneration and to minimize the amount of scarce and costly Pt [12][13][14].…”