Hydrothermal Stability of Ru/SiO2–C: A Promising Catalyst for Biomass Processing through Liquid-Phase Reactions

Gatti, Martín Nicolás; Lombardi, Maria Barbara; Gazzoli, Delia; Santori, Gerardo Fabián; Pompeo, Francisco; Nichio, Nora N.

doi:10.3390/catal7010006

Cited by 6 publications

(7 citation statements)

References 37 publications

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“…In agreement with TPR analysis (vide supra), with the as purchased Ru/C sample (spectra not shown), only Ru 4+ species were detected by XPS analysis: such a result, apparently in contrast with the catalytic activity of the fresh catalyst (Figure S3), is indeed in agreement with the fact that before XPS measurements the powder was exposed to air to induce spontaneous evaporation of the protective solvent, with a consequent oxidation on the surface of Ru particles. Correspondingly, in the O 1s region two components were found, assigned to C–O (532.4 eV) and O=C–O (530.8 eV) groups, the latter likely coordinating surface Ru 4+ species. Figure reports the curve-fitting of the XP spectra performed on the Ru 3d 5/2 and the O 1s core levels of the Ru/C and Ru/C_5c samples.…”

Section: Results and Discussionmentioning

confidence: 95%

“…Raman spectroscopy, a valuable tool with which to identify different oxidation states for Ru (with the exception of metallic ruthenium), 16,41,42 may efficiently detect crystalline RuO 2 , whereas amorphous ruthenium oxide does not exhibit Raman peaks in the wavelength region investigated in this study: 43 with the (RuO 2 ) 0.038 •(SiO 2 ) 0.962 powder (spectrum a in Figure 9A), 3 signals at about 641, 703, and 520 cm −1 are detected, respectively ascribed to the A 1g , B 2g , and E g main Raman modes of crystalline RuO 2 . 38 Conversely, with both Ru-SiO 2 and Ru-SiO 2 _5c (spectra b and c in Figure 9A), no Raman bands related to crystalline RuO 2 are detected, in agreement with the catalyst reduction and the previous characterization.…”

Section: Acs Catalysismentioning

confidence: 99%

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Self-Activating Catalyst for Glucose Hydrogenation in the Aqueous Phase under Mild Conditions

et al. 2019

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The search for efficient routes for the production of sorbitol from starch-derived glucose is of great interest and importance because sorbitol is a highly attractive chemical for different applications, such as a building block for the synthesis of fine chemicals, additives in food, and the cosmetic and paper industries. In this study, the (RuO2)0.038·(SiO2)0.962 nanomaterial was prepared by a one-pot sol–gel route. The performances of the gel-derived catalyst in the glucose hydrogenation reaction, in the aqueous phase and mild conditions, are reported and compared with those of a commercial Ru/C catalyst. When the commercial Ru/C catalyst was used, a high activity and no selectivity loss were observed, but the activity dramatically dropped soon after the first cycle; on the contrary, the gel-derived catalyst activity increased during the first three cycles. The different catalytic behavior was ascribed to the morphological distribution of the Ru active phase in the gel-derived catalyst. Actually, the adopted synthesis procedure leads to a multimodal size distribution of the Ru nanoparticles, which are fairly stabilized by a combined interaction with the SiO2 support and the reaction environment, which proved to be active in obtaining a self-activating catalyst.

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Section: Results and Discussionmentioning

confidence: 95%

Section: Acs Catalysismentioning

confidence: 99%

Self-Activating Catalyst for Glucose Hydrogenation in the Aqueous Phase under Mild Conditions

et al. 2019

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“…The presence of mesopores was observed in all materials. Micropore surface (S micro ) and micropore volume (V micro ) were estimated using the t-plot method, while the mesopore surface (S meso ) was calculated by subtracting S micro from S BET [27]. .…”

Section: Support Characterizationmentioning

confidence: 99%

Improvement of the catalytic activity of Ni/SiO 2 -C by the modification of the support and Zn addition: Bio-propylene glycol from glycerol

Gatti

Mizrahi

Ramallo-López

et al. 2017

Applied Catalysis A: General

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In previous studies, we prepared Ni catalysts supported on a silica-carbon composite which is selective for obtaining 1,2-propylene glycol (1,2-PG). In order to improve the activity levels of this catalyst, in the present work we propose to modify the catalyst formulation by means of two strategies: on the one hand, to modify the acidity of the catalyst through the functionalization of the carbon support and, on the other hand, to modify the metallic phase by the addition of Zn from a controlled preparation technique (Surface Organometallic Chemistry on Metals), which allows the selective addition of small amounts of modifier on the metallic particles. The functionalization of the SC support at 80°C employing HNO 3 at 60 wt% as oxidizing agent allowed increasing the number of surface acid sites that provide Lewis-type acidity without loss of specific surface area. The addition of 1.1-1.8 wt% of Zn (which corresponds to catalysts NiZn0.2/SC and NiZn0.32/SC) generates the formation of an active site composed of an α-NiZn alloy responsible for the increase in activity. When the addition of Zn is 2.8 wt% (which corresponds to catalyst NiZn0.5/SC), the generation of a new tetragonal phase of β 1-NiZn would cause the decrease of catalytic activity. These results indicate that the Zn addition has a more significant effect upon the activity and selectivity on the CeO bond cleavage reactions than the effect of the support acidity upon the dehydration activity.

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“…Additionally, catalytic upgrading of biomass and derived compounds have been reported over various supported ruthenium oxide catalysts. 16,[36][37][38][39][40][41][42] The many applications of ruthenium in catalysis has rendered it a very wellstudied metal in both homogeneous and heterogeneous systems. [43][44][45][46][47][48][49][50][51][52][53][54] More recently, Mizuno and Yamaguchi reported high activity of supported ruthenium hydroxide catalysts (Ru(OH)x/support) in liquid-phase oxidations of alcohols, aldehydes and amines.…”

Section: Introductionmentioning

confidence: 99%

Selective formation of formic acid from biomass-derived glycolaldehyde with supported ruthenium hydroxide catalysts

Modvig

Riisager

2019

Catal. Sci. Technol.

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Hydrothermal Stability of Ru/SiO2–C: A Promising Catalyst for Biomass Processing through Liquid-Phase Reactions

Cited by 6 publications

References 37 publications

Self-Activating Catalyst for Glucose Hydrogenation in the Aqueous Phase under Mild Conditions

Self-Activating Catalyst for Glucose Hydrogenation in the Aqueous Phase under Mild Conditions

Improvement of the catalytic activity of Ni/SiO 2 -C by the modification of the support and Zn addition: Bio-propylene glycol from glycerol

Selective formation of formic acid from biomass-derived glycolaldehyde with supported ruthenium hydroxide catalysts

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