scholarly journals Effect of Surface Composition and Structure of the Mesoporous Ni/KIT-6 Catalyst on Catalytic Hydrodeoxygenation Performance

Catalysts ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 889 ◽  
Author(s):  
Xianming Zhang ◽  
Shuang Chen ◽  
Fengjiao Wang ◽  
Lidan Deng ◽  
Jianmin Ren ◽  
...  
Keyword(s):  
Surface Composition ◽  
Reduction Temperature ◽  
Active Components ◽  
Composition And Structure ◽  
Metal Support Interaction ◽  
Metal Support ◽  
Apparent Activation Energies ◽  
Loading Amount ◽  
Methane Selectivity

A series of Ni/KIT6 catalyst precursors with 25 wt.% Ni loading amount were reduced in H2 at 400, 450, 500, and 550 °C, respectively. The studied catalysts were investigated by XRD, Quasi in-situ XPS, BET, TEM, and H2-TPD/Ranalysis methods. It was found that reduction temperature is an important factor affecting the hydrodeoxygenation (HDO) performance of the studied catalysts because of the Strong Metal Support Interaction Effect (SMSI). The reduction temperature influences mainly the content of active components, crystal size, and the abilityfor adsorbing and activating H2. The developed pore structure and large specific surface area of the KIT-6 support favored the Ni dispersion. The RT450 catalyst, which was prepared in H2 atmosphere at 450 °C, has the best HDO performance. Ethyl acetate can be completely transformed and maintain 96.8% ethane selectivity and 3.2% methane selectivity at 300 °C. The calculated apparent activation energies of the prepared catalysts increased in the following order: RT550 > RT400 > RT500 > RT450.

scholarly journals Study of Catalytic Hydrodeoxygenation Performances of Ni/KIT-6 Catalyst－Effect of Reduction Temperature

2019 ◽  
Author(s):  
Xianming Zhang ◽  
Shuang Chen ◽  
Fengjiao Wang ◽  
Lidan Deng ◽  
Jianmin Ren ◽  
...  
Keyword(s):  
Ethyl Acetate ◽  
Specific Surface ◽  
Crystal Size ◽  
Reduction Temperature ◽  
Large Specific Surface Area ◽  
Active Components ◽  
Apparent Activation Energies ◽  
Loading Amount ◽  
Methane Selectivity ◽  
Catalyst Effect

A series of Ni/KIT6 catalystprecusors with 25wt.%Ni loading amount were reduced in H2 at 400, 450, 500, and 550ºC, respectively. The studied catalysts were investigated by XRD, Quasiin-situ XPS, BET, TEM, and H2-TPDanalysis methods.It was found that reduction temperature is an important factor affecting the hydrodeoxygenation (HDO) performance of the studied catalysts. The reduction temperature influences mainly the content of active components, crystal size, and the abilityfor adsorbing and activatingH2. The developed pore structure and large specific surface area of the KIT-6 support favored the Ni dispersion.The RT450 catalyst, which was prepared in H2 atmosphere at 450 ºC, has the best HDO performance. Ethyl acetate can be completely transformed, and maintain 96.8% ethane selectivity and 3.2% methane selectivity at 300 ºC. The calculated apparent activation energies of the prepared catalysts increased in the following order: RT550 > RT400 > RT500 > RT450.

Strong metal-support interaction in Ni/TiO2 catalysts: in situ EXAFS and related studies

1993 ◽  
Vol 17 (1-2) ◽  
pp. 29-37 ◽  
Author(s):  
T. Arunarkavalli ◽  
G. U. Kulkarni ◽  
G. Sankar ◽  
C. N. R. Rao
Keyword(s):  
Support Interaction ◽  
Metal Support Interaction ◽  
Metal Support ◽  
In Situ Exafs ◽  
Strong Metal Support Interaction

scholarly journals Ni–Zn–Al-Based Oxide/Spinel Nanostructures for High Performance, Methane-Selective CO2 Hydrogenation Reactions

2019 ◽  
Vol 150 (6) ◽  
pp. 1527-1536
Author(s):  
T. Rajkumar ◽  
András Sápi ◽  
Marietta Ábel ◽  
Ferenc Farkas ◽  
Juan Fernando Gómez-Pérez ◽  
...  
Keyword(s):  
High Performance ◽  
Consumption Rate ◽  
Hydrogenation Reaction ◽  
Reaction Conditions ◽  
Metal Support Interaction ◽  
Metal Support ◽  
Hydrogenation Reactions ◽  
Oxide Spinel ◽  
Methane Selectivity ◽  
Spinel Structures

Abstract In the present study, NiO modified ZnAl2O4 and ZnO modified NiAl2O4 spinel along with pure Al2O3, ZnAl2O4 and NiAl2O4 for comparison in the CO2 hydrogenation reaction have been investigated. It was found that NiAl2O4, NiO/ZnAl2O4 and ZnO/NiAl2O4 catalysts exhibited outstanding activity and selectivity towards methane even at high temperature compared to similar spinel structures reported in the literature. NiO/ZnAl2O4 catalyst showed CO2 consumption rate of ~ 19 μmol/g·s at 600 °C and ~ 85% as well as ~ 50% of methane selectivity at 450 °C and 600 °C, respectively. The high activity and selectivity of methane can be attributed to the presence of metallic Ni and Ni/NiO/ZnAl2O4 interface under the reaction conditions as evidenced by the XRD results. Graphic Abstract High performance Ni–Zn–Al-based oxide/spinel nanostructures is synthesized and NiO/ZnAl2O4 catalyst exhibited higher catalytic activity in the CO2 hydrogenation reaction due to the presence of metal support interaction between Ni and ZnAl2O4 support.

Enhancing metal–support interaction by in situ ion-exchanging strategy for high performance Pt catalysts in hydrogen evolution reaction

2020 ◽  
Vol 8 (32) ◽  
pp. 16582-16589 ◽  
Author(s):  
Xulei Sui ◽  
Lei Zhang ◽  
Junjie Li ◽  
Kieran Doyle-Davis ◽  
Ruying Li ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
High Performance ◽  
Pt Catalysts ◽  
Acidic Media ◽  
Support Interaction ◽  
Metal Support Interaction ◽  
Metal Support ◽  
Metal Support Interactions

A facile in situ ion-exchanging strategy directly enhances metal–support interactions between Pt and support and promotes HER electrocatalytic performance in acidic media.

IMPURITY AND SUPPORT EFFECTS ON SURFACE COMPOSITION AND CO+NO REACTIONS OVER Pt–Rh/CeO2 NANOPARTICLES: A COMPARATIVE STUDY

2003 ◽  
Vol 17 (27) ◽  
pp. 4831-4839 ◽  
Author(s):  
BADAL C. KHANRA ◽  
ABIR DE SARKAR
Keyword(s):  
Monte Carlo Simulation ◽  
Surface Composition ◽  
Formation Rate ◽  
Ceo2 Nanoparticles ◽  
Monte Carlo Simulation Technique ◽  
Support Interaction ◽  
Metal Support Interaction ◽  
Metal Support ◽  
Ceria Support ◽  
Simulated Surface

A Monte Carlo simulation technique has been used to investigate the effect of sulphur impurity and ceria support on the surface composition and catalytic activity of Pt–Rh /ceria nanocatalysts. For temperatures in the range of 400–1300 K the surface Pt concentration decreases with increase in sulphur coverage. The Pt concentration at the base of the nanocatalyst in contact with the support increases with metal-support interaction. However, for weak metal-support interaction (Vms<-0.01 eV ) the surface Pt concentration slightly increases with metal-support interaction. Overall, sulphur is found to influence the surface composition much more strongly than the metal-support interaction. The MC-simulated surface composition results have been used to study the energetics of the CO+NO reactions over Pt–Rh/CeO 2 catalysts. It is found that the CO 2 formation rate decreases with increase in sulphur coverage and marginally increases with metal-support interaction up to Vms=-0.01 eV . All the results qualitatively agree with the experimental results.

scholarly journals H2-TPR, XPS and TEM Study of the Reduction of Ru and Re promoted Co/γ-Al2O3, Co/TiO2 and Co/SiC Catalysts

2016 ◽  
Vol 5 (2) ◽  
pp. 39 ◽  
Author(s):  
H. Romar ◽  
A. H. Lillebo ◽  
P. Tynjala ◽  
T. Hu ◽  
A. Holmen ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Metallic Nanoparticles ◽  
Surface Composition ◽  
Active Phase ◽  
Support Materials ◽  
Metal Support Interaction ◽  
Active Metal ◽  
Metal Support ◽  
Oxide Phases

<p class="1Body">Effects of Ru and Re promoters on Co-CoO<sub>x </sub>catalysts supported on γ-Al<sub>2</sub>O<sub>3</sub>, TiO<sub>2</sub> and SiC were investigated to improve the understanding of the role of promoters of the active phase of Co-CoO<sub>x</sub>-Ru and Co-CoO<sub>x</sub>-Re. The influence of promoter addition on the composition and activity of the catalysts was characterized by several methods, such as H<sub>2</sub>-TPR, XPS, chemisorption and TEM. Furthermore, the role of support and metal-support interaction was especially studied and different support materials were compared.</p><p class="1Body">Based on the results, addition of promoter metals (Ru or Re) will most likely improve catalytic activity of Co/γ-Al<sub>2</sub>O<sub>3</sub>, Co/TiO<sub>2</sub> and Co/SiC catalysts by increasing the active metal surface available for chemical reaction and by decreasing the size of the metallic nanoparticles. These changes in the catalytic activity were also associated with the changes in the ratio of metal and metal oxide phases in the surface composition as observed by XPS. Promoter metals also decreased the reduction temperatures needed for the reduction of Co<sub>3</sub>O<sub>4</sub> to CoO and further to metallic cobalt. Significant decrease in reduction temperature was observed especially when ruthenium was used as the promoter.</p>

Probing Metal–Support Interaction in Reactive Environments: An in Situ Study of PtCo Bimetallic Nanoparticles Supported on TiO2

2012 ◽  
Vol 116 (27) ◽  
pp. 14342-14349 ◽  
Author(s):  
V. Papaefthimiou ◽  
T. Dintzer ◽  
M. Lebedeva ◽  
D. Teschner ◽  
M. Hävecker ◽  
...  
Keyword(s):  
Bimetallic Nanoparticles ◽  
Support Interaction ◽  
In Situ Study ◽  
Metal Support Interaction ◽  
Metal Support

scholarly journals The role of metal–support interaction for CO-free hydrogen from low temperature ethanol steam reforming on Rh–Fe catalysts

2017 ◽  
Vol 19 (6) ◽  
pp. 4199-4207 ◽  
Author(s):  
Catherine K. S. Choong ◽  
Luwei Chen ◽  
Yonghua Du ◽  
Martin Schreyer ◽  
S. W. Daniel Ong ◽  
...  
Keyword(s):  
Steam Reforming ◽  
Active Sites ◽  
Support Interaction ◽  
Metal Support Interaction ◽  
Free Hydrogen ◽  
Metal Support ◽  
Fe Catalysts ◽  
Ethanol Steam

Effect of metal–support interaction on the generation of Rh–FexOy active sites is investigated via various in situ techniques.

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