Bimetallic Rh–Fe catalysts for N2O decomposition: effects of surface structures on catalytic activity

2018 ◽  
Vol 20 (7) ◽  
pp. 5103-5111 ◽  
Author(s):  
Hao Chen ◽  
Qinghua Lu ◽  
Chunhai Yi ◽  
Bolun Yang ◽  
Suitao Qi
Keyword(s):  
Catalytic Activity ◽  
N2o Decomposition ◽  
Catalytic Conversion ◽  
Surface Structures ◽  
Core Shell ◽  
Alloy Nanoparticles ◽  
Highly Dispersed ◽  
Fe Catalysts

Well-homogenized RhFe alloy nanoparticles and core–shell structured Fe@Rh nanoparticles were highly dispersed on SBA-15 and then applied to N2O catalytic conversion.

scholarly journals Stabilizing Highly Dispersed Halo Sites in Thermally Restructured Palladium Core@shell Nanoparticles for Improved Catalyst Activity and Durability

2021 ◽  
Author(s):  
Alexander Hill ◽  
Adarsh Bhat ◽  
Zachary Berquist ◽  
Galen Fisher ◽  
Andrej Lenert ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Catalyst Activity ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Highly Dispersed ◽  
Catalytically Active ◽  
Metal Support ◽  
The Stability ◽  
Material Utilization ◽  
Core Shell Nanoparticles

Stabilizing high dispersions of catalytically active metals is integral to improving the lifetime, activity, and material utilization of catalysts that are periodically exposed to high temperatures during operation or maintenance. We have found that annealing palladium-based core@shell catalysts in air at elevated temperature (800°C) promotes the redispersion of active metal into highly dispersed sites, which we refer to as halo sites. Here, we examine the restructuring of Pd@SiO2 and Pd@CeO2 core@shell catalysts over successive 800°C aging cycles to understand the formation, activity, nanoscale structure and stability of these palladium halo sites. While encapsulation generally improves metal utilization by providing a physical barrier that promotes redispersion over agglomeration, our cycled aging experiments demonstrate that halo sites are not stable in all catalysts. Halo sites continue to migrate in Pd@SiO2 due to poor metal-support bonding, which leads to palladium agglomeration. In contrast, halo sites formed in Pd@CeO2 remain stable. The dispersed palladium also synergistically stabilizes the ceria from agglomerating. We attribute this stability, in addition to an observed improvement in catalytic activity, to the coordination between palladium and reducible ceria that arises during the formation of halo sites. We probe the importance of ceria oxidation state on the stability of halo sites by aging Pd@CeO2 after it has been reduced. While some halo sites agglomerate, we find that returning to air aging mitigates the loss of these sites and catalytic activity. Our findings illustrate how nanoscale catalyst structures can be designed to promote the formation of highly stable and dispersed metal sites.

Bimetallic Au–Pd Alloy Catalysts for N2O Decomposition: Effects of Surface Structures on Catalytic Activity

2012 ◽  
Vol 116 (10) ◽  
pp. 6222-6232 ◽  
Author(s):  
Xing Wei ◽  
Xiao-Feng Yang ◽  
Ai-Qin Wang ◽  
Lin Li ◽  
Xiao-Yan Liu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
N2o Decomposition ◽  
Surface Structures ◽  
Pd Alloy ◽  
Alloy Catalysts

AuPd/C core–shell and alloy nanoparticles with enhanced catalytic activity toward the electro-oxidation of ethanol in alkaline media

2019 ◽  
Vol 251 ◽  
pp. 313-325 ◽  
Author(s):  
Lays S.R. Silva ◽  
Caio V.S. Almeida ◽  
Cristiano T. Meneses ◽  
Elizete A. Batista ◽  
Sydney F. Santos ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Alkaline Media ◽  
Core Shell ◽  
Alloy Nanoparticles ◽  
Electro Oxidation ◽  
Oxidation Of Ethanol

scholarly journals Highly efficient hydrogen generation from formic acid using a reduced graphene oxide-supported AuPd nanoparticle catalyst

2016 ◽  
Vol 52 (22) ◽  
pp. 4171-4174 ◽  
Author(s):  
Xinchun Yang ◽  
Pradip Pachfule ◽  
Yao Chen ◽  
Nobuko Tsumori ◽  
Qiang Xu
Keyword(s):  
Graphene Oxide ◽  
Catalytic Activity ◽  
Formic Acid ◽  
Reduced Graphene Oxide ◽  
Noble Metal ◽  
Hydrogen Generation ◽  
Alloy Nanoparticles ◽  
Reduced Graphene ◽  
Highly Dispersed ◽  
Nanoparticle Catalyst

Highly dispersed AuPd alloy nanoparticles have been successfully immobilized on reduced graphene oxide using a facile non-noble metal sacrificial method, which exhibit the highest catalytic activity for dehydrogenation of formic acid at 323 K.

Determination of surface composition of alloy nanoparticles and relationships with catalytic activity in Pd–Cu/SiO2 cogelled xerogel catalysts

2004 ◽  
Vol 270 (1-2) ◽  
pp. 201-208 ◽  
Author(s):  
Stéphanie Lambert ◽  
Benoı̂t Heinrichs ◽  
Alain Brasseur ◽  
André Rulmont ◽  
Jean-Paul Pirard
Keyword(s):  
Catalytic Activity ◽  
Surface Composition ◽  
Alloy Nanoparticles

Monodispersed palladium–cobalt alloy nanoparticles assembled on poly(N-vinyl-pyrrolidone) (PVP) as a highly effective catalyst for dimethylamine borane (DMAB) dehydrocoupling

RSC Advances ◽  
2016 ◽  
Vol 6 (29) ◽  
pp. 24097-24102 ◽  
Author(s):  
Betül Çelik ◽  
Yunus Yıldız ◽  
Hakan Sert ◽  
Esma Erken ◽  
Yagmur Koşkun ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Catalytic Performance ◽  
Vinyl Pyrrolidone ◽  
Alloy Nanoparticles ◽  
Turnover Frequency ◽  
Cobalt Alloy ◽  
High Turnover ◽  
Effective Catalyst ◽  
Dimethylamine Borane ◽  
Very High

Monodispersed PdCo@PVP NPs showed record catalytic activity, giving the best catalytic performance yet with a very high turnover frequency.

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