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PrOx catalysts for the combustion of soot generated in diesel engines: effect of CuO and 3DOM structures

机译：PrOx催化剂燃烧的烟尘柴油发动机中产生:错和效果3 dom结构

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PrOx and CuO/PrOx catalysts have been prepared with conventional (Ref) and three dimensionally ordered macroporous (3DOM) structures, and the effect of the structure on soot combustion has been studied. It has been demonstrated that the 3DOM structure significantly improves the catalytic combustion of soot with O-2. The activity follows the trend PrOx-3DOM > CuO/PrOx-3DOM approximate to CuO/PrOx-Ref >> PrOx-Ref, which is explained considering two aspects: the production of active oxygen and its transfer from catalyst to soot. FESEM microscopy, N-2 adsorption, Hg porosimetry and He density show that the 3DOM catalysts have ordered macroporosity with pores of 80 nm in diameter, which favors the carbon-catalyst contact. In addition, the 3DOM catalysts present higher surface density of active oxygen (O-ads), which follows the trend CuO/PrOx-3DOM > PrOx-3DOM approximate to CuO/PrOx-Ref > PrOx-Ref. Consequently, the PrOx-3DOM catalyst combines a good production of active oxygen and an efficient transfer to soot, making it the most active catalyst to accelerate soot combustion. In contrast, PrOx-Ref is the least active since it is the least efficient in producing and transferring active oxygen. The impregnation of copper with the conventional support (CuO/PrOx-Ref) enhances the production and transfer of active oxygen, improving the activity with respect to PrOx-Ref. However, CuO blocks the porosity of the 3DOM support, hindering the contact with soot. Soot combustion is accelerated in the presence of NOx due to the production of NO2. This NO2, once produced, is mostly readsorbed on the surface of the catalysts producing active oxygen that must be transferred to soot. For this reason, the porosity of the catalysts also plays a relevant role during combustion with NOx/O-2 because it affects the transfer of active oxygen produced by NO2 to soot.
机译：PrOx和措/ PrOx催化剂已经准备与传统(Ref)和三维有序大孔(3 dom)结构,结构对燃烧烟尘的影响被研究过。3 dom结构显著提高了催化燃烧的烟尘坐坐。活动遵循这一趋势PrOx-3DOM >CuO / PrOx-3DOM approximate to CuO / PrOx-Ref > >PrOx-Ref,考虑两个解释方面:活性氧和它的生产从催化剂转移到烟尘。n -吸附、Hg porosimetry密度显示3 dom催化剂已下令大孔隙度与孔隙直径80纳米,这有利于carbon-catalyst接触。另外,3 dom催化剂更高活性氧的表面密度(O-ads)近似措/ PrOx-Ref > PrOx-Ref。因此,PrOx-3DOM催化剂结合了良好的生产活性氧和高效转移到烟尘,使其最活跃催化剂加速燃烧烟尘。相反,PrOx-Ref因为它是最活跃在生产和是最有效的转让活性氧。铜与传统的支持(错/ PrOx-Ref)提高生产活性氧的转移,改善活动PrOx-Ref。3 dom支持的孔隙度,阻碍了接触烟尘。的氮氧化物的生产二氧化氮。readsorbed表面的催化剂产生活性氧,必须转移烟尘。催化剂中也扮演相关角色燃烧氮氧化物/ 0 2,因为它影响转让活性氧产生的二氧化氮烟尘。

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