Author: Eduardo Saucedo-AlvarezPublisher:
ISBN:
Category :
Languages : en
Pages : 384
Book Description
Nitric Oxide Reduction on Supported Metal Oxide Catalysts
Author: Eduardo Saucedo-AlvarezPublisher:
ISBN:
Category :
Languages : en
Pages : 384
Book Description
Activity and Kinetic Studies of Chemically Mixed Titania-supported Metal Oxide Catalysts for Nitric Oxide Reduction with Ammonia
Author: Wing Cheong WongPublisher:
ISBN:
Category : Catalysts
Languages : en
Pages : 384
Book Description
Reduction of Nitric Oxide with Ammonia on Noble Metal and Non-noble Metal Oxide Catalysts
Author: Shu Chuan WuPublisher:
ISBN:
Category : Nitric oxide
Languages : en
Pages : 206
Book Description
Influence of Metal-support Interactions on the Reduction of Nitric Oxide Over Rhodium Catalysts
Author: Nutan Kumari PandeThe Reduction of Nitric Oxide by Ammonia on Supported Platinum Catalysts
Author: Robert Joseph PusateriPublisher:
ISBN:
Category : Catalysis
Languages : en
Pages : 306
Book Description
Development and Characterization of Mixed Oxide Catalysts for the Selective Catlytic Reduction of Nitric Oxide from Stationary Sources Using Amonnia
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Seven first row transition metals were deposited on various commercial TiO2, SiO2, and Al2 O3 supports to create mono- and bimetallic catalysts that were compared in the selective catalytic reduction of nitric oxide using ammonia at low temperatures ranging from 373-523 K. The catalyst with the highest activity both in the absence and presence of water in the feed was 20 wt.% Mn/Hombikat TiO2 synthesized from a nitrate precursor and calcined below 673 K. Under those conditions, it was capable of achieving 100% NO conversion at 393 K. Numerous surface characterization techniques were used to identify the surface properties that result in highly active and selective low temperature SCR catalysts. The deposition of manganese as MnO2, the ease of reducibility of the metal oxide, and the symmetric deformation of ammonia coordinated to Lewis acid sites at 1167 cm−1, were all found to be important for good catalytic performance. No synergistic effects were observed from combinations of the three most active transition metals. However, MnO x -NiO/TiO2 had an extended lifetime relative to MnO x /TiO2 in feeds containing SO2 . The extensive data collected from in-situ FTIR experiments in the presence of NO and NH 3 were used to propose a reaction mechanism for MnO x /TiO2 that begins with the coordination of NH3 over Mn4 species and proceeds through the formation of bridged nitrates. A combination of potentiometric titrations and UV/Vis spectroscopy were used to quantify the reduction of V5 to V4 after the addition of oxalic acid as the solution is aged. After approximately four hours, the aging vanadium oxalate solution reaches steady state, and the final distribution of the vanadium present is 89% V+4 and 11% V+5 . TiO2 supported monolayer catalysts synthesized from the aged (V+4) vanadium oxalate solution consistently outperformed catalysts made from freshly prepared (V+5) vanadium oxalate solutions. Surface characterization revealed that surface acid sites increase in strength and vanadia reduces more easily in catalysts synthesized from aged vanadium oxalate solutions, which enhances reaction mechanism depends upon acid sites and redox operation.
The Reduction of Nitric Oxide with Propene Under Lean-burn Conditions Over Alumina and Alumina-supported Metal Catalysts
Author: Jong-Hwan LeePublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The lean NOx reduction activity over Au/gamma-Al2O 3 was found to depend on the crystallite size of Au, being higher for smaller Au crystallites. But, when Au particles were very small (5 nm) and highly dispersed, the catalyst was active for propene combustion. Al 2O3 also contributes significantly to the overall activity of Au/Al2O3 catalysts at high temperatures (500°C).
Nitric Oxide Decomposition and Reduction by Methane Over Supported Barium Oxide Catalysts
Author: Shuibo XieNitric Oxide Reduction with Hydrogen Over Carbon-supported Copper-iron Oxides Catalysts
Author: Ibrahim YakubThe Reduction of Nitric Oxide with Hydrocarbons in an Oxidizing Atmosphere Over Metal Oxide Catalysts
Author: Kathleen Ann BethkePublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
A synergistic effect was observed over a mixture of Ag/Al$\rm\sb2O\sb3$ and Al$\rm\sb2O\sb3$ and was attributed to the transfer of a very short-lived reaction intermediate from Al$\rm\sb2O\sb3\ to\ Ag/Al\sb2O\sb3$ or visa versa.