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Wang, Y. (author), Makkee, M. (author)
The influence of potassium in Rh on a lanthium promoted zirconia stablised ceria (CZ) catalysts was studied toward NO<sub>x</sub>reduction reactivity and selectivity. The results are compared with a Rh/CZ catalyst. The samples were characterised by N<sub>2</sub> adsorption, XRD, SEM, ICP, and H<sub>2</sub>-TPR. The study highlighted the...
journal article 2019
document
Wang, Y. (author), Kapteijn, F. (author), Makkee, M. (author)
In this study, the role of the noble metals Pt and Rh (0.5 wt.%) for the selective reduction of NO into N<sub>2</sub> is evaluated by the transient TAP technique and in-situ spectroscopy using a commercial stable ceria support (denoted as CZ) and applying isotopically labelled <sup>15</sup>NO and <sup>18</sup>O<sub>2</sub>. The transient...
journal article 2018
document
Wang, Y. (author), Makkee, M. (author)
Oxygen defects in reduced ceria are the catalytic sites for the NO reduction into N<sub>2</sub> in the Toyota Di-Air DeNO<sub>x</sub> abatement technology. Traces of NO (several hundred ppm) have to compete with the excess amount of other oxidants, e.g., 5% CO<sub>2</sub> and 5% O<sub>2</sub>, in an exhaust gas of a lean burn (diesel) engine....
journal article 2018
document
Wang, Y. (author), Makkee, M. (author)
Toyota's Di-Air DeNO<sub>x</sub> system is a promising DeNO<sub>x</sub> system to meet NO<sub>x</sub> emission requirement during the real driving, yet, a fundamental understanding largely lacks, e.g. the benefit of fast frequency fuel injection. Ceria is the main ingredient in Di-Air catalyst composition. Hence, we investigated the reduction...
journal article 2018
document
Wang, Y. (author)
Nitrogenoxides (NOx, including NO and NOx) are a group of hazardous, toxic and harmfulgasses, which have an adverse effect on both environment and human health,e.g., acid rain, photochemical smog, and affecting the human respiratorysystem. The NOx concentration in most of the EUcities exceeds the EU annual limit value (40 μg/m3). Around40% of...
doctoral thesis 2017
document
Wang, Y. (author), Posthuma De Boer, J (author), Kapteijn, F. (author), Makkee, M. (author)
Temporal analysis of product (TAP) is used to investigate the effectiveness of CO, C<sub>3</sub>H<sub>6</sub>, and C<sub>3</sub>H<sub>8</sub> in the reduction of a La–Zr doped ceria catalyst and NO reduction into N<sub>2</sub> over this pre-reduced catalyst. Hydrocarbons are found to be substantially more effective in the reduction of this...
journal article 2016
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