Nitric Oxide Reduction with Hydrogen Over Carbon-supported Copper-iron Oxides Catalysts PDF Download
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Author: Ibrahim Yakub
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Ibrahim Yakub
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Steven Alan Tunick
Publisher:
ISBN:
Category : Automobiles
Languages : en
Pages : 94
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Author: William Clark Hecker
Publisher:
ISBN:
Category :
Languages : en
Pages : 618
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Author: Eduardo Saucedo-Alvarez
Publisher:
ISBN:
Category :
Languages : en
Pages : 384
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Author: Ian Stewart Crawford
Publisher:
ISBN:
Category : Automobiles
Languages : en
Pages : 754
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Author: Shan Xio
Publisher:
ISBN:
Category : Air
Languages : en
Pages : 106
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The catalytic reduction of nitric oxides by solid carbonaceous material consisting primarily of granular activated carbon or (GAC) was studied in a fix bed catalytic reactor in order to develop the technology for removing NO and soot simultaneously from diesel engine exhaust. The catalytic activity and conversion of NO as a function of reaction temperature was evaluated as a function of space velocity. The results show that at lean condition and high gaseous hourly space velocity, vis., 50,000 ~ 80,000, Cu-ZSM-5 does not perform as well with CO and GAC as it does with gaseous hydrocarbons(HC). Plain GAC has low activity for NO reduction at high temperature above 550°C under lean condition. However, copper-impregnated GAC has good activity for both NO reduction and carbon oxidation under lean conditions. Actually in presence of 1 to 10% oxygen, the activity and conversion of NO to N2 due to reaction with carbon is enhanced at a lower light off temperature of 350°C. Over 60% conversion was obtained at gaseous hourly space velocity of 50,000 ~ 80,000. Almost 100% conversion was obtained when GHSV was lowered to 20,000. In order to get insight on the mechanism of this reaction, the reduction of NO with CO was studied over various catalysts at the same condition. It was determined that the results are consistent with CO being an intermediate for the reduction of NO with carbon. We also investigated the deactivation of these catalysts. The results show that the presence of SO2 and water poison copper catalysts. For this reason, it is necessary to develop other catalysts for controlling both NOx and soot. This research is part of a NSF project for developing a novel technique to remove NOx soot simultaneously from diesel engines.
Author: Joseph William Ault
Publisher:
ISBN:
Category :
Languages : en
Pages : 180
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Author: Matthew Maurice Yung
Publisher:
ISBN:
Category : Carbon monoxide
Languages : en
Pages : 228
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Abstract: The environmental applications of oxidation catalysis were examined as part of a two-stage strategy for the reduction of nitrogen oxides (NOx) and also for the removal of carbon monoxide from hydrogen streams. Cobalt-based catalysts were examined. Reduction of NOx, Co/TiO2 and Co/ZrO2 were studied for the oxidation of NO to NO2 in excess oxygen. NO oxidation was studied as the first step in a two-step catalytic scheme where NO is oxidized to NO2 and, in turn, NO2 is reduced with CH4 to N2 under lean conditions. Catalysts were prepared by sol-gel and incipient-wetness impregnation techniques. It was found that increasing the calcination temperature had an adverse effect on the activity of the IWI catalysts. Catalyst characterization showed higher activity for NO oxidation on Co/ZrO2 than on Co/TiO2 which was observed to correlate with the formation of the Co3O4 phase. For the preferential oxidation of CO, cobalt on several metal oxide supports were investigated and showed the highest activity on Co/ZrO2. A variety of reaction experiments were performed to examine the effects of reactant concentrations, residence time, and temperature on the CO conversion and O2 selectivity to CO2.
Author: D'Arcy Harold Lorimer
Publisher:
ISBN:
Category :
Languages : en
Pages : 330
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Author: Andrzej Cybulski
Publisher: CRC Press
ISBN: 1420028006
Category : Science
Languages : en
Pages : 828
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Book Description
Interest in structured catalysts is steadily increasing due to the already proven, as well as potential, advantages of these catalysts. Updating the comprehensive coverage of the first edition published in 1998 with the latest science and applications, Structured Catalysts and Reactors, Second Edition gives detailed information on all aspect
