A Comparative Study of the Selective Oxidation of NH3 to N2 over Transition Metal Catalysts

2013 ◽  
Vol 798-799 ◽  
pp. 239-244
Author(s):  
Wen Qin Wang ◽  
Xiao Long Tang ◽  
Hong Hong Yi ◽  
Jing Li Hu
Keyword(s):  
Transition Metal ◽  
Catalytic Oxidation ◽  
Transition Metal Catalysts ◽  
Oxidation Catalyst ◽  
High Yield ◽  
Incipient Wetness Impregnation ◽  
Selective Catalytic Oxidation ◽  
Series Of Experiments ◽  
Incipient Wetness

Cu-Mn/Al2O3, Cu-Mn/TiO2and Cu-Mn/SBA-15 were prepared by incipient wetness impregnation. The activity of those catalysts for selective catalytic oxidation (SCO) of ammonia to nitrogen at low temperature (100°C~250°C) is not so satisfying. 5%Cu-5%Zr/TiO2has the highest NH3conversion and highest NO, NO2yield. 5%Cu-5%Mn/Al2O3is a promising NH3selective catalytic oxidation catalyst, but still needs further study. SBA-15 is a bad support for Cu-Mn. Al2O3-based catalysts and TiO2-based catalysts were also prepared by incipient wetness impregnation to sure the synergistic effect between transition metal. The results find the activity on Cu-Mn/Al2O3is better than Cu-Mn/TiO2, but NH3conversion on Cu-Zr/TiO2is rather well with high yield of NO. The role of supports and transition metals play in catalyst are discussed by a series of experiments. Key ward: SCO, NH3, transition metal, γ-Al2O3, TiO2, SBA-15

scholarly journals Graphene catalyzes the reversible formation of a C–C bond between two molecules

2018 ◽  
Vol 4 (12) ◽  
pp. eaau9366 ◽  
Author(s):  
J. J. Navarro ◽  
M. Pisarra ◽  
B. Nieto-Ortega ◽  
J. Villalva ◽  
C. G. Ayani ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Transition Metal ◽  
Chemical Reaction ◽  
Transition Metal Catalysts ◽  
Magnetic Switch ◽  
Kondo Resonance ◽  
Efficient Charge ◽  
Catalytic Role ◽  
Reversible Formation

Carbon deposits are well-known inhibitors of transition metal catalysts. In contrast to this undesirable behavior, here we show that epitaxial graphene grown on Ru(0001) promotes the reversible formation of a C–C bond between −CH2CN and 7,7,8,8-tetracyano-p-quinodimethane (TCNQ). The catalytic role of graphene is multifaceted: First, it allows for an efficient charge transfer between the surface and the reactants, thus favoring changes in carbon hybridization; second, it holds the reactants in place and makes them reactive. The reaction is fully reversible by injecting electrons with an STM tip on the empty molecular orbitals of the product. The making and breaking of the C–C bond is accompanied by the switching off and on of a Kondo resonance, so that the system can be viewed as a reversible magnetic switch controlled by a chemical reaction.

Role of the Cu content and Ce activating effect on catalytic performance of Cu-Mg-Al and Ce/Cu-Mg-Al oxides in ammonia selective catalytic oxidation

2021 ◽  
pp. 151540
Author(s):  
Sylwia Górecka ◽  
Kateřina Pacultová ◽  
Aneta Smýkalová ◽  
Dagmar Fridrichová ◽  
Kamil Górecki ◽  
...  
Keyword(s):  
Catalytic Oxidation ◽  
Catalytic Performance ◽  
Cu Content ◽  
Selective Catalytic Oxidation

Role of Transition Metal Catalysts in Single-Walled Carbon Nanotube Growth in Chemical Vapor Deposition

2003 ◽  
Vol 107 (44) ◽  
pp. 12161-12164 ◽  
Author(s):  
Yoshikazu Homma ◽  
Yoshiro Kobayashi ◽  
Toshio Ogino ◽  
Daisuke Takagi ◽  
Roichi Ito ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Carbon Nanotube ◽  
Transition Metal ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Transition Metal Catalysts ◽  
Single Walled Carbon Nanotube ◽  
Carbon Nanotube Growth ◽  
Nanotube Growth
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