Catalytic Removal (catalytic + removal)

Distribution by Scientific Domains


Selected Abstracts


Effect of Catalysis on Plasma Assisted Catalytic Removal of Nitrogen Oxides and Soot

CHEMICAL ENGINEERING & TECHNOLOGY (CET), Issue 10 2006
X. Peng
Abstract An active perovskite-type catalyst (La0.8K0.2Cu0.05Mn0.95O3) was prepared and characterized using XRD, BET, and SEM. Then, the effect of catalysis on plasma assisted catalytic removal of nitrogen oxides and soot was investigated by combining temperature programmed reaction (TPR) and the analysis of Fourier transform infrared spectroscopy (FT-IR). When the C3H6 concentration in the feed gas is 0.27,%, the maximum NOx removal rate increases from 43.5,% to 72.2,% after adding catalyst. FT-IR results indicate that the addition of catalyst will promote the removal of NOx, HC, and soot. There is still great amount of NOx and HC remaining after plasma reaction, little NOx and almost no HC after catalytic reaction, and no NOx and HC after plasma assisted catalytic reaction. [source]


Simultaneous Catalytic Removal of Nitrogen Oxides and Soot from Diesel Exhaust Gas over Potassium Modified Iron Oxide

CHEMICAL ENGINEERING & TECHNOLOGY (CET), Issue 9 2003
S. Kureti
Abstract Iron oxide modified by potassium, i.e. Fe1.9K0.1O3, exhibits high catalytic performance for the simultaneous conversion of soot and NOx into CO2 and N2. The present study shows that long-time treatment of the catalyst leads to a drastic decrease in the activity, whereas even the aged catalyst maintains considerable activity. On the other hand, long-time treatment causes selective N2 formation, i.e. no more formation of the byproduct N2O. This alteration of catalytic performance is likely due to agglomeration of the promoter potassium being present at the surface of catalyst. Detailed experiments were carried out with a more realistic diesel model exhaust gas to confirm that Fe1.9K0.1O3 is a suitable catalyst for the simultaneous removal of soot and NOx between 350 and 480 ░C. It was assumed that (CO) intermediates, formed by the catalytic reaction of NOx and oxygen with the soot surface, are the reactive species in NOx -soot conversion. [source]


Catalytic Removal of N-Allyloxycarbonyl Groups Using the [CpRu(IV)(,-C3H5)(2-quinolinecarboxylato)] PF6 Complex.

CHEMINFORM, Issue 44 2006
A New Efficient Deprotecting Method in Peptide Synthesis.
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source]


Modeling of the catalytic removal of CO and NO in dry combustion gases

AICHE JOURNAL, Issue 3 2010
C. Trevi˝o
Abstract Catalytic removal of pollutants in dry combustion gases in a planar stagnation-point flow over a platinum foil is studied using both numerical and analytical tools. The governing equations have been numerically integrated with the Newton technique, and the response curve has been obtained as functions of temperature and the mixture concentrations. Using the appropriate stoichiometry, the additional oxygen needed to reduce the NO and to achieve complete oxidation of CO has been obtained. The asymptotic analysis leads to an algebraic equation for the surface coverage of empty sites as a function of two nondimensional parameters: the mass transfer number, relating the residence time to the chemical time (sort of Damk÷hler number), and a parameter, which relates the desorption rate to the adsorption rate of carbon monoxide and depends strongly on temperature. Critical conditions of ignition (light-off) and extinction are identified and closed form solutions are obtained for these phenomena. ę 2009 American Institute of Chemical Engineers AIChE J, 2010 [source]


Effect of Catalysis on Plasma Assisted Catalytic Removal of Nitrogen Oxides and Soot

CHEMICAL ENGINEERING & TECHNOLOGY (CET), Issue 10 2006
X. Peng
Abstract An active perovskite-type catalyst (La0.8K0.2Cu0.05Mn0.95O3) was prepared and characterized using XRD, BET, and SEM. Then, the effect of catalysis on plasma assisted catalytic removal of nitrogen oxides and soot was investigated by combining temperature programmed reaction (TPR) and the analysis of Fourier transform infrared spectroscopy (FT-IR). When the C3H6 concentration in the feed gas is 0.27,%, the maximum NOx removal rate increases from 43.5,% to 72.2,% after adding catalyst. FT-IR results indicate that the addition of catalyst will promote the removal of NOx, HC, and soot. There is still great amount of NOx and HC remaining after plasma reaction, little NOx and almost no HC after catalytic reaction, and no NOx and HC after plasma assisted catalytic reaction. [source]