High Temperature Durability of Electrically Heated Extruded Metal Support

1994 ◽  
Author(s):  
K. P. Reddy ◽  
S. T. Gulati ◽  
D. W. Lambert ◽  
P. S. Schmidt ◽  
D. S. Weiss
Keyword(s):  
High Temperature ◽  
Metal Support

On the origin of high-temperature phenomena in Pt/Al2O3

2018 ◽  
Vol 20 (4) ◽  
pp. 2339-2350 ◽  
Author(s):  
Alexander S. Lisitsyn ◽  
Olga A. Yakovina
Keyword(s):  
High Temperature ◽  
Metal Particles ◽  
Complex Interplay ◽  
Dynamic Changes ◽  
Highly Dispersed ◽  
Metal Support

This study shows a complex interplay between the adsorbate, metal particles and underlying support, which causes dynamic changes at the metal–support interface and governs the behavior and properties of highly-dispersed nanosystems.

scholarly journals One-Step High-Temperature-Synthesized Single-Atom Platinum Catalyst for Efficient Selective Hydrogenation

Research ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-10 ◽  
Author(s):  
Qingyuan Bi ◽  
Xiaotao Yuan ◽  
Yue Lu ◽  
Dong Wang ◽  
Jian Huang ◽  
...  
Keyword(s):  
High Temperature ◽  
Platinum Catalyst ◽  
Arc Discharge ◽  
Utilization Efficiency ◽  
Single Atom ◽  
Excellent Thermal Stability ◽  
Sufficient Energy ◽  
Metal Support ◽  
Order Of Magnitude ◽  
One Step

Although single-atom catalysts significantly improve the atom utilization efficiency, the multistep preparation procedures are complicated and difficult to control. Herein, we demonstrate that one-step in situ synthesis of the single-atom Pt anchored in single-crystal MoC (Pt1/MoC) by using facile and controllable arc-discharge strategy under extreme conditions. The high temperature (up to 4000°C) provides the sufficient energy for atom dispersion and overall stability by forming thermodynamically favourable metal-support interactions. The high-temperature-stabilized Pt1/MoC exhibits outstanding performance and excellent thermal stability as durable catalyst for selective quinoline hydrogenation. The initial turnover frequency of 3710 h-1 is greater than those of previously reported samples by an order of magnitude under 2 MPa H2 at 100°C. The catalyst also shows broad scope activity toward hydrogenation containing unsaturated groups of C=C, C=N, and C=O. The facile, one-step, and fast arc-discharge method provides an effective avenue for single-atom catalyst fabrication that is conventionally challenging.

HREM study of strong-metal interaction in Pt/TiO2

1993 ◽  
Vol 51 ◽  
pp. 734-735
Author(s):  
Ming-Hui Yao
Keyword(s):  
High Temperature ◽  
Catalytic Properties ◽  
Atomic Scale ◽  
Metal Particles ◽  
Support Interaction ◽  
Metal Interaction ◽  
Metal Support Interaction ◽  
Metal Support ◽  
Reducible Oxides ◽  
Smsi Effect

The chemisorption ability and catalytic properties of metal particles supported on reducible oxides are often altered by high temperature reduction(HTR) in a process known as strong metal-support interaction(SMSI). Different models have been proposed to explain the SMSI mechanism. In recent years, experimental evidences have favored the "decoration model", which suggests that SMSI is due to the encapsulation of the metal particles by oxide overlayer species dial have migrated from the support. HREM profile imaging was the most useful tool to directly relate these surface decorations to the SMSI effects. The profile imaging can provide atomic-scale information about supported particles and Uieir surfaces without image being obscured by overlapping contrast from the support.In the present work, the SMSI effect in Pt/TiO2 and Pt/CeO2 model catalysts have been studied using HREM profile imaging and multislice simulations. HREM observations were made with a JEM-4000EX microscope, operated at 400 kV. Fig. 1(a) shows a typical profile image of TiO2 after HTR in H2 at 923K.

Strong metal-support interaction between Pt and SiO2 following high-temperature reduction: a catalytic interface for propane dehydrogenation

2017 ◽  
Vol 53 (51) ◽  
pp. 6937-6940 ◽  
Author(s):  
Lidan Deng ◽  
Hiroki Miura ◽  
Tetsuya Shishido ◽  
Saburo Hosokawa ◽  
Kentaro Teramura ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
High Temperature ◽  
Pt Nanoparticles ◽  
Propane Dehydrogenation ◽  
High Catalytic Activity ◽  
Support Interaction ◽  
Temperature Reduction ◽  
Metal Support Interaction ◽  
Metal Support ◽  
Smsi Effect

Pt/SiO2 directly reduced in H2 at 1073 K exhibited a high catalytic activity in propane dehydrogenation, primarily attributed to the electronic modification of Pt nanoparticles by the SMSI effect.

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