Size-dependent strong metal-support interaction in Pd/ZnO catalysts for hydrogenation of CO2 to methanol

Strong metal-support interaction (SMSI) has long been studied in catalytic reactions. Proper utilization of the SMSI effect might not only improve the stability of the catalysts, but also the activity...

Substoichiometric ultrathin zirconia films cause strong metal–support interaction

ZrO2/metal inverse model catalysts exhibit the strong metal–support interaction (SMSI) effect. Upon annealing under reducing conditions, an oxygen-deficient, ultrathin ZrO≈1.5 film covers the metal. Nevertheless, Zr retains its 4+ charge state.

Erbium oxide as a novel support for palladium nanocatalysts with strong metal–support interactions: remarkable catalytic performance in hydrogenation reactions

The SMSI effect and strong chemisorption of H2 on Pd–Er2O3 nanocatalysts significantly improve the catalytic performance for the hydrogenation reactions.

Fischer-Tropsch synthesis: Variation of Co/ ${{\gamma}}$ γ -Al2O3 catalyst performance due to changing dispersion, reducibility, acidity and strong metal-support interaction by Ru, Zr and Ce promoters

In this study the effect of (0.1 %Ru, 0–10 % Zr) and (0.1 %Ru, 0–10 % Ce) promoters on dispersion, strong metal-support interaction and reduction behavior of cobalt-supported alumina catalyst in the Fischer-Tropsch synthesis was investigated. The synthesized catalysts were characterized by BET, XRD, ICP, TPR, XPS, and TEM techniques. The results show that addition of Ce to the catalyst leads to the shift of the TPR peaks to lower temperatures which expected that shows higher activity due to higher reducibility, but surprisingly due to SMSI effect results in the lower catalyst activity compared with the unpromoted catalyst. Also, there was a synergistic effect between Ce and Ru in the reduction behavior of Ru-Ce promoted catalyst. The other notable finding of this study was the improvement in the catalyst reducibility in the presence of Zr compared with the unpromoted one that equivalently means the higher catalyst activity. Comparison of the Zr-promoted with the Ce-promoted catalysts show that the former have higher catalyst activity than the latter due to higher acidity and SMSI effect in the presence of the Zr promoter. The C5selectivity of the 0.1Ru10Zr/15Co and 3Ce/15Co catalysts at low pressure have shown more than 50 % improvement compared to the unpromoted one. Based on the activity at atmospheric pressure; the unpromoted, 0.1Ru/15Co, 0.1Ru3Ce/15Co and 0.1Ru10Zr/15Co catalysts were selected for high pressure condition tests, in which the 0.1Ru10Zr/15Co catalyst shows the highest catalyst activity and heavier hydrocarbon selectivity.

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

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.

The Preparation of Ordered Mesoporous Al2O3 and its Application in Ni-Based Catalysts for CH4/CO2 Reforming

Template method was used to prepare ordered mesoporous alumina, and with purchased γ-Al2O3contrast. BET results showed that the specific surface area and average pore diameter of the mesoporous Al2O3were 226.95 m2.g-1and 3.91nm respectively, and with higher degree of order. XRD results showed that the cat-P catalyst with the carrier of prepared ordered mesoporous alumina hold small active component grains, which means better dispersion. H2-TPR results showed that the SMSI effect of cat-P catalyst was stronger than that of cat-B. Stability tests showed that cat-P catalyst in 50h experiment showed high activity and stability, and the conversion of CH4and CO2were above 90% and 95% respectively among the reaction time, and the deactivation rate of CO2was 0.05%/h only. From TG-DTG curve could be seen that the deposition carbon on cat-P catalyst after 48h reaction was in whisker form, which did not cover the active sites and had little influence on the activity and stability of the catalyst.