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.

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.

Molecular Modelling for Reactor Design

2018 ◽  
Vol 9 (1) ◽  
pp. 201-227 ◽  
Author(s):  
Frerich J. Keil
Keyword(s):  
Chemical Reactor ◽  
Dynamic Changes ◽  
Multicomponent Adsorption ◽  
Metal Support ◽  
Recent Developments ◽  
Metal Support Interactions ◽  
Nanoparticle Structure ◽  
And Diffusion ◽  
Noncovalent Bonding ◽  
Reaction Schemes

Chemical reactor modelling based on insights and data on a molecular level has become reality over the last few years. Multiscale models describing elementary reaction steps and full microkinetic schemes, pore structures, multicomponent adsorption and diffusion inside pores, and entire reactors have been presented. Quantum mechanical (QM) approaches, molecular simulations (Monte Carlo and molecular dynamics), and continuum equations have been employed for this purpose. Some recent developments in these approaches are presented, in particular time-dependent QM methods, calculation of van der Waals forces, new approaches for force field generation, automatic setup of reaction schemes, and pore modelling. Multiscale simulations are discussed. Applications of these approaches to heterogeneous catalysis are demonstrated for examples that have found growing interest over the last few years, such as metal-support interactions, influence of pore geometry on reactions, noncovalent bonding, reaction dynamics, dynamic changes in catalyst nanoparticle structure, electrocatalysis, solvent effects in catalysis, and multiscale modelling.

scholarly journals Enhancement of high-temperature selectivity on Cu-SSZ-13 towards NH3-SCR reaction from highly dispersed ZrO2

2020 ◽  
Vol 263 ◽  
pp. 118359 ◽  
Author(s):  
Bo Peng ◽  
Kenneth G. Rappé ◽  
Yanran Cui ◽  
Feng Gao ◽  
János Szanyi ◽  
...  
Keyword(s):  
High Temperature ◽  
Nh3 Scr ◽  
Highly Dispersed ◽  
Temperature Selectivity

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

Nanosized Metal Particles by Control of the Metal Dispersion During Sol-Gel Processing

1994 ◽  
Vol 351 ◽  
Author(s):  
Ulric Schubert ◽  
Claus Görsmann ◽  
Stefan Tewinkel ◽  
Andreas Kaiser ◽  
Thomas Heinrich
Keyword(s):  
Metal Complexes ◽  
Sol Gel ◽  
Metal Particles ◽  
Metal Dispersion ◽  
Bimetallic Particles ◽  
Highly Dispersed ◽  
Gel Processing

ABSTRACTThe previously developed method to prepare highly dispersed metals in SiO2 by sol-gel processing of metal complexes containing alkoxysilyl-substituted ligands was extended to the preparation (i) of bimetallic particles in SiO2 and (ii) of highly dispersed metals in TiO2.

scholarly journals Plasma Promotes Dry Reforming Reaction of CH4 and CO2 at Room Temperature with Highly Dispersed NiO/γ-Al2O3 Catalyst

Catalysts ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1433
Author(s):  
Shan-Shan Lin ◽  
Peng-Rui Li ◽  
Hui-Bo Jiang ◽  
Jian-Feng Diao ◽  
Zhong-Ning Xu ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Particle Size ◽  
Room Temperature ◽  
Dry Reforming ◽  
Impregnation Method ◽  
Support Interaction ◽  
Metal Support Interaction ◽  
Highly Dispersed ◽  
Metal Support ◽  
Al2o3 Catalyst

Plasma is an efficient method that can activate inert molecules such as methane and carbon dioxide in a mild environment to make them reactive. In this work, we have prepared an AE-NiO/γ-Al2O3 catalyst using an ammonia-evaporation method for plasma promoted dry reforming reaction of CO2 and CH4 at room temperature. According to the characterization data of XRD, H2-TPR, TEM, XPS, etc., the AE-NiO/γ-Al2O3 catalyst has higher dispersion, smaller particle size and stronger metal-support interaction than the catalyst prepared by the traditional impregnation method. In addition, the AE-NiO/γ-Al2O3 catalyst also exhibits higher activity in dry reforming reaction. This work provides a feasible reference experience for the research of plasma promoted dry reforming reaction catalysts at room temperature.

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