Selective Catalytic Reduction of NOxwith NH3over Mn, Ce Substitution Ti0.9V0.1O2−δNanocomposites Catalysts Prepared by Self-Propagating High-Temperature Synthesis Method

Microalloying of MoSi2 to form Mo(1−x)MexSi2 (Me = Nb or V) was investigated by the self-propagating high-temperature synthesis method. With alloying element contents up to 5 at.%, a homogeneous C11b solid solution was obtained. For higher contents of alloying elements, the product contained both the C11b and the hexagonal C40 phases. The relative amount of the C40 phase increases with an increase in the content of alloying metals in the starting mixture. The alloying element content in the hexagonal C40 Mo(1−x)MexSi2 phase was nearly constant at a level of about 12 at.% for all starting compositions. In contrast, the content of the alloying elements in the tetragonal phase is considerably lower (around 4 at.%) and increases slightly as the Me content in the starting mixture is increased.

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Microstructural and Mechanical Properties of Cu-based Alloy Manufactured by Self-propagating High-temperature Synthesis Method

Journal of Powder Metallurgy and Mining ◽

10.4172/2168-9806.1000144 ◽

2016 ◽

Vol 05 (01) ◽

Author(s):

Amiour Y ◽

Zemmour K ◽

Vrel D

Keyword(s):

Mechanical Properties ◽

High Temperature ◽

Synthesis Method ◽

Temperature Synthesis ◽

High Temperature Synthesis

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Catalytic combustion of soot over Cu, Mn substitution CeZrO2- nanocomposites catalysts prepared by self-propagating high-temperature synthesis method

Chemical Engineering Science ◽

10.1016/j.ces.2018.05.063 ◽

2018 ◽

Vol 189 ◽

pp. 320-339 ◽

Cited By ~ 5

Author(s):

Bin Guan ◽

He Lin ◽

Reggie Zhan ◽

Zhen Huang

Keyword(s):

High Temperature ◽

Catalytic Combustion ◽

Synthesis Method ◽

Temperature Synthesis ◽

High Temperature Synthesis ◽

Mn Substitution

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Direct observation of the formation and stabilization of metallic nanoparticles on carbon supports

Nature Communications ◽

10.1038/s41467-020-20084-5 ◽

2020 ◽

Vol 11 (1) ◽

Author(s):

Zhennan Huang ◽

Yonggang Yao ◽

Zhenqian Pang ◽

Yifei Yuan ◽

Tangyuan Li ◽

...

Keyword(s):

High Temperature ◽

Metallic Nanoparticles ◽

Synthesis Method ◽

Md Simulations ◽

Graphite Substrate ◽

Carbon Supports ◽

Temperature Synthesis ◽

Excellent Thermal Stability ◽

High Temperature Synthesis ◽

Underlying Mechanisms

AbstractDirect formation of ultra-small nanoparticles on carbon supports by rapid high temperature synthesis method offers new opportunities for scalable nanomanufacturing and the synthesis of stable multi-elemental nanoparticles. However, the underlying mechanisms affecting the dispersion and stability of nanoparticles on the supports during high temperature processing remain enigmatic. In this work, we report the observation of metallic nanoparticles formation and stabilization on carbon supports through in situ Joule heating method. We find that the formation of metallic nanoparticles is associated with the simultaneous phase transition of amorphous carbon to a highly defective turbostratic graphite (T-graphite). Molecular dynamic (MD) simulations suggest that the defective T-graphite provide numerous nucleation sites for the nanoparticles to form. Furthermore, the nanoparticles partially intercalate and take root on edge planes, leading to high binding energy on support. This interaction between nanoparticles and T-graphite substrate strengthens the anchoring and provides excellent thermal stability to the nanoparticles. These findings provide mechanistic understanding of rapid high temperature synthesis of metal nanoparticles on carbon supports and the origin of their stability.

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