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Issue 16, 2020
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A deactivation mechanism study of phosphorus-poisoned diesel oxidation catalysts: model and supplier catalysts

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Abstract

The effect of phosphorus poisoning on the catalytic behavior of diesel oxidation catalysts was investigated over model and supplier monolith catalysts, i.e., Pd–Pt/Al2O3. The results of ICP and XPS from the vapor-phase poisoning over model catalysts suggested that the temperature of phosphorus poisoning affects both the overall content of phosphorus and the dispersion of phosphorus (i.e., inlet/outlet and surface/bulk). Phosphorus oxide (P2O5), metaphosphate (PO3), and phosphate (PO43−) were identified in the poisoned model and supplier catalysts. The distribution of these species on poisoned model catalysts was highly dependent on the poisoning temperature, i.e., a higher temperature resulted in a higher concentration of PO43−. The outlets of the monoliths contained more PO43− and less P2O5 than the inlets. Both active sites and surface OH groups on model and supplier catalysts were contaminated upon phosphorus poisoning. It is found that PO43− had a stronger influence on the active sites than P2O5. One significant finding in this study is that the vapor-phase phosphorus poisoning could be a practical and cost efficient approach to simulate an accelerated aging/poisoning process.

Graphical abstract: A deactivation mechanism study of phosphorus-poisoned diesel oxidation catalysts: model and supplier catalysts

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Article information


Submitted
24 Mar 2020
Accepted
06 Jul 2020
First published
15 Jul 2020

This article is Open Access

Catal. Sci. Technol., 2020,10, 5602-5617
Article type
Paper

A deactivation mechanism study of phosphorus-poisoned diesel oxidation catalysts: model and supplier catalysts

A. Wang, J. Wang, S. Sheti, S. Dahlin, J. Han, J. Woo, K. Xie, L. J. Pettersson and L. Olsson, Catal. Sci. Technol., 2020, 10, 5602
DOI: 10.1039/D0CY00589D

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