Metal - Modified CeO2 and ZrO2 Catalysts for Nitric Oxide Decomposition and Selective Catalytic Reduction by Methane PDF Download
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Author: Christoforos Kazazis
Publisher:
ISBN:
Category : Decomposition (Chemistry)
Languages : en
Pages : 216
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Author: Christoforos Kazazis
Publisher:
ISBN:
Category : Decomposition (Chemistry)
Languages : en
Pages : 216
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Author: Chee Ming Chong
Publisher:
ISBN:
Category : Catalysis
Languages : en
Pages :
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Author: Masaru Ogura
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Category :
Languages : en
Pages : 171
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Author: Enrique Aceves
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Category :
Languages : en
Pages : 232
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Author:
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ISBN:
Category :
Languages : en
Pages : 41
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A flow trough type catalytic reactor system was adequately modified for NO related catalytic and adsorption measurements, including the on-line connection of a digital chemiluminescent NO-NO(subscript x) analyzer to the reactor outlet system. Moreover, we have largely completed the installation of an FTIR coupled catalytic system containing a HTEC cell for high temperature DRIFT studies. Three different barium cuprate samples, Ba2CuO3, BaCuO2, and Ba2Cu3O5 were synthesized and characterized by powder XRD for catalytic tests. Prior to catalytic studies over these cuprates, a new, liquid indium based supported molten metal catalyst (In-SMMC) was tested in the reduction of NO by various reductants. In the presence of excess O2 and H2O, the In-SMMC proved to be more active for the selective catalytic reduction (SCR) of NO to N2 by ethanol than most other catalysts. Using C1-C3 alcohols as reductants, self sustained periodic oscillations observed in the NO(subscript x) concentrations of reactor effluents indicated the first time that radical intermediates can be involved in the SCR of NO by alcohols. Further, In-SMMC is the only effective and water tolerant SCR catalyst reported thus far which contains SiO2 support. Thus, this novel catalyst opens up a promising new alternative for developing an effective and durable catalyst for NO(subscript x) abatement in stack emission.
Author: Zhang Yanping
Publisher:
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Category :
Languages : en
Pages : 446
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Author:
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Category :
Languages : en
Pages : 12
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This project will investigate a suitable catalyst system for the direct NO decomposition, for post-combustion NO. control. The proposed process will not use a reductant, such as ammonia in case of Selective Catalytic Reduction (SCR) process for catalytic reduction of NO(subscript x) to nitrogen. This is a simplified process basically involving passing the flue gas through a catalytic converter, thus avoiding problems generally associated with the commercial Selective Catalytic Reduction (SCR) process, namely high operating cost, ammonia slip, and potential N20 emissions. A brief description of the proposed work is as follows: Catalysts will be prepared by incorporating metal cations into zeolite supports according to ion exchange procedures widely used in preparation of metal/zeolite catalysts. Zeolites will be modified to improve catalytic activity, by blocking ion exchange sites in the small pores of zeolites with promoter cations of high valence. The catalysts of primary interest include copper (Cu), palladium (Pd), platinum (Pt), silver (Ag), and nickel (Ni) exchanged zeolites.
Author:
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ISBN:
Category :
Languages : en
Pages : 74
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Author: Haibin Ning
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 0
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The defects-rich cerium oxide (CeO2) supported metal oxide or metal catalysts (Cu, Co, Ni, Fe, Mn and Ru) for catalytic CO2 reduction were studied. For comparison, thermal catalysis, plasma catalysis and electrocatalysis techniques were carried out under various equilibrium and non-equilibrium experimental conditions. The effects of particle morphology, surface modification and reduction treatment on CeO2 supports and supported catalysts were also investigated and discussed to understand the underlying mechanisms in terms of the valence states, surface defects and support-catalyst interaction.A series of surface engineered CeO2 (nanorods, nanocubes, and nanoctahedra) supported metal oxide catalysts were synthesized, characterized and applied to achieve low-temperature and energy-efficient CO2 reduction. The comparison between thermal catalysis under thermodynamic equilibrium conditions and plasma catalysis under non-equilibrium conditions reveals the promotion effect of plasma on the catalytic activity of CO2 hydrogenation with the ionized gas in the plasma region via the formation of highly reactive species (i.e., vibrationally and electronically excited ions and free radicals). The effect of reduction activation treatment was examined that could change the valence states of Ru species and provide alternative reaction pathways for CO2hydrogenation, leading to higher CO2 conversion at low temperature (~95% at 150 oC) under plasma conditions. Furthermore, ~89 % CO2 conversion and ~98 % CH4 selectivity were obtained for surface modified CeO2 nanorods (mCeO2NR) supported RuOx catalysts at 150 oC, companied with excellent stability (~87 % CO2 conversion at 350 oC). Applying surface modification on the CeO2 surface generates more surface defects (oxygen vacancy, voids, and steps, etc.) as anchoring sites for Ru species and increases the thermal stability of catalyst clusters.Additionally, electrocatalytic conversion of CO2 was conducted at room temperature under atmospheric pressure with CeO2 doped RuOx catalyst films. Different CeO2 nanocrystals including pristine CeO2NR, mCeO2NR, CeO2 nanocubes (CeO2NC) and CeO2 nanoctahedra (CeO2NO) were doped into RuOx and the mCeO2NR-RuOx thin film was found to present the highest current density (166 mA/cm2 at -1.6 V vs RHE.) with the highest double-layer capacitance (100 mF/cm2) and lowest resistance from the linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS) and cyclic voltammetry results.
Author:
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Category :
Languages : en
Pages : 20
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