Novel Ru-Mg-Al-O catalyst derived from hydrotalcite-like compound for NO storage/decomposition/reduction

Li, L.D., Yu, J.J., Hao, Z.P. and Xu, Z.P. (2007) Novel Ru-Mg-Al-O catalyst derived from hydrotalcite-like compound for NO storage/decomposition/reduction. Journal of Physical Chemistry C, 111 28: 10552-10559. doi:10.1021/jp0678352


Author Li, L.D.
Yu, J.J.
Hao, Z.P.
Xu, Z.P.
Title Novel Ru-Mg-Al-O catalyst derived from hydrotalcite-like compound for NO storage/decomposition/reduction
Journal name Journal of Physical Chemistry C   Check publisher's open access policy
ISSN 1932-7447
Publication date 2007
Sub-type Article (original research)
DOI 10.1021/jp0678352
Volume 111
Issue 28
Start page 10552
End page 10559
Total pages 8
Place of publication Washington
Publisher Amer Chemical Soc
Collection year 2008
Language eng
Subject 291804 Nanotechnology
C1
770101 Climate change
Abstract Ru-Mg-Al hydrotalcite-like anionic clay (Mg/Al/Ru) 90: 29: 1) was successfully prepared with a constant-pH coprecipitation method. Calcination of a hydrotalcite-like precursor at 600 degrees C in the air gave rise to the well-mixed oxide Ru-Mg-Al-O that possesses a good dispersion of Ru species. Ru-Mg-Al-O catalyst after suitable pretreatment exhibits quite high NOx storage capability in the temperature range of 250-400 degrees C, and the highest NOx storage capability of about 220 mu mol g(-1) is obtained at 350 degrees C with flowing 790 ppm NO and 8% O-2 in N-2 stream. Meanwhile, the decomposition of 25-60% NO to N-2 as well as N2O is clearly observed on the catalyst at 300-400 degrees C. In situ diffuse reflectance Fourier transform ( DRIFT) spectra indicate that NOx is adsorbed and stored on a catalyst mainly in the form of various coordinated nitrites/ nitrates. On the basis of the NOx adsorption-desorption profiles as well as the in situ DRIFTS spectra, we have proposed a schematic outline for NOx storage and NO decomposition. Finally, the reduction of stored NOx species on the catalyst by H-2 was carried out at 350 degrees C, indicating that all adsorbed NOx species can be readily reduced by hydrogen.
Keyword Chemistry, Physical
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Storage-reduction Catalysts
Ammonia Decomposition
Thermal Evolution
Stepped Ru(0001)
Stored Nox
Storage/reduction
Dissociation
Adsorption
Deactivation
Regeneration
Q-Index Code C1
Q-Index Status Confirmed Code

 
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Created: Mon, 18 Feb 2008, 14:21:17 EST