Selektivitätsverbesserung des katalytischen Nitratabbaus durch Verwendung von Katalysatorgemischen aus nitratreduzierenden PdCu/Al2O3‐ und nitritreduzierenden Pd/Al2O3‐Katalysatoren

Hähnlein, Marc; Prüße, Ulf; Hörold, Sebastian; Vorlop, Klaus‐Dieter

doi:10.1002/cite.330690113

Cited by 18 publications

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“…It may play a major role in surface nitrogen removal, for example, in automobile gas convertors (involving active Pt-Rh sites [7,24]) working at the start of a cold engine or in the catalyzed reduction of aqueous nitrate and nitrite ions [25][26][27]. However, its kinetic and dynamic behavior is still unclear.…”

Section: Introductionmentioning

confidence: 99%

N2 emission-channel change in NO reduction over stepped Pd(211) by angle-resolved desorption

et al. 2012

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A sharp change in the N 2 emission channel from N 2 O(a)→N 2 (g) +O(a) to N(a)+N(a)→N 2 (g) has been found at around 500 K in a steady-state NO+D 2 reaction over stepped Pd(211)= [(S)3(111)×(100)] by means of angle-resolved desorption. The desorbing N 2 is highly collimated at around 30° off normal toward the step-down direction below about 500 K due to the intermediate N 2 O decomposition, whereas, above 500 K, the near normally directed desorption due to the recombination of N(a) is relatively enhanced. The N 2 O decomposition channel is promoted when the reaction is carried out with hydrogen (deuterium) and the channel change is accelerated by quick changes of the amounts of surface hydrogen and oxygen (or NO(a)) into the opposite directions, and enhanced nitrogen removal as ammonia on the resultant hydrogen-rich surface. In the steady-state NO+CO reaction, the N 2 emission channel gradually changes above 500 K toward recombination. A model for the off-normal N 2 emission is briefly described.

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Section: Introductionmentioning

confidence: 99%

N2 emission-channel change in NO reduction over stepped Pd(211) by angle-resolved desorption

et al. 2012

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“…Because of the low metal loading, no structural information on the formed bimetallic component could be provided. Furthermore, supported Cu–Pd catalysts or Cu–Pd nanoparticles have been tested in dimethyl ether reforming [18], the water gas shift reaction [19], electrochemical oxidation of methanol [20], nitrate hydrogenation [21,22], hydration of acrylonitrile [23,24], hexa-1,5-diene hydrogenation [25] and the reduction of nitrates [26]. …”

Section: Introductionmentioning

confidence: 99%

Order-Induced Selectivity Increase of Cu60Pd40 in the Semi-Hydrogenation of Acetylene

et al. 2013

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The two structural modifications of Cu60Pd40 were synthesized as bulk powders and tested as unsupported model catalysts in the semi-hydrogenation of acetylene. The partly ordered low-temperature modification (CsCl type of structure) showed an outstanding ethylene selectivity of >90% over 20 h on stream while the disordered high-temperature modification (Cu type of structure) was 20% less selective, indicating an influence of the degree of order in the crystal structure on the catalytic properties. The results are supported by XRD and in situ XPS experiments. The latter suggest the existence of partly isolated Pd sites on the surface. In situ PGAA investigations proved the absence of metal hydride formation during reaction. Quantum chemical calculations of the electronic structure of both modifications using the CPA-FPLO framework revealed significant differences in their respective density of states, thus still leaving open the question of whether the degree of structural order or/and the electronic hybridization is the decisive factor for the observed difference in selectivity.

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Catalysis in Water Remediation

Prüße

Thielecke

Vorlop

2008

Handbook of Heterogeneous Catalysis

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The sections in this article are Introduction Oxidation Processes Wet Air Oxidation ( WAO ) Conventional Wet Air Oxidation Supercritical Water Oxidation Catalytic Wet Air Oxidation ( CWAO ) Fenton Processes Conventional Fenton Processes Photo‐Assisted Fenton Processes Applications of Fenton Processes Photocatalysis Other Oxidation Processes Reduction Processes Hydrodechlorination/Hydrodehalogenation Hydrodechlorination by Zero‐Valent Metals Hydrodechlorination with Supported Metal Catalysts Hydrodenitration Conclusions

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Selektivitätsverbesserung des katalytischen Nitratabbaus durch Verwendung von Katalysatorgemischen aus nitratreduzierenden PdCu/Al₂O₃‐ und nitritreduzierenden Pd/Al₂O₃‐Katalysatoren

Cited by 18 publications

References 4 publications

N2 emission-channel change in NO reduction over stepped Pd(211) by angle-resolved desorption

N2 emission-channel change in NO reduction over stepped Pd(211) by angle-resolved desorption

Order-Induced Selectivity Increase of Cu60Pd40 in the Semi-Hydrogenation of Acetylene

Catalysis in Water Remediation

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