Liquid phase hydrogenation of cinnamaldehyde over supported ruthenium catalysts: Influence of particle size, bimetallics and nature of support

Coq, Bernard; Kumbhar, Pramod; Moreau, Claude; Moreau, P.; Warawdekar, Mayukh G.

doi:10.1016/0304-5102(93)80103-2

Cited by 89 publications

(47 citation statements)

References 20 publications

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“…In the case of Pt/TiO 2 , the reversible strong metal support interaction (SMSI) induced decoration of Pt particles with titania suboxides is utilized to induce chemical promotion without changing the metal particle size of the Pt catalyst. This produces results similar to base metal oxide promoted catalysts (8,9). …”

Section: Introductionsupporting

confidence: 55%

“…Promoted and unpro- 1 To whom correspondence should be addressed. moted metals (4,5,6) and various supports (carbon based (7), metal oxide (8), and microporous (9) supports) have been explored in that respect. Despite the thorough investigation of the influence of the chemical nature of the metal on the selectivity the role of the particle size effects has seen less attention.…”

Section: Introductionmentioning

confidence: 99%

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Structure Sensitivity of the Hydrogenation of Crotonaldehyde over Pt/SiO2and Pt/TiO2

Englisch

Jentys

Lercher

1997

Journal of Catalysis

299

214

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Hydrogenation of crotonaldehyde has been studied over SiO 2 -and TiO 2 -supported Pt catalysts. Over Pt/SiO 2 , the selectivity to the primary products butyraldehyde and crotylalcohol depends critically on the Pt particle size; i.e., the selectivity to the unsaturated alcohol increases with increasing particle size. For large metal particles, the high fraction of Pt(111) surfaces is concluded to favor the adsorption of crotonaldehyde via the carbonyl bond. On small Pt particles, the high abundance of metal atoms in low coordination allows unconstrained adsorption of both double bonds. In this case, the hydrogenation of the C= =C bond is kinetically favored. Activity and selectivity of Pt/TiO 2 catalysts after low-temperature reduction are similar to those of Pt/SiO 2 . After high-temperature reduction the selectivity to crotylalcohol is generally enhanced. The selectivity of Pt/TiO 2 catalysts is then determined by the metal particle size and the extent of decoration of Pt with TiO x particles. The presence of coordinatively unsaturated Ti cations in these oxide particles enhances the sorption strength of the C= =O bond resulting in an enhanced selectivity to crotylalcohol. The effects of metal particle size and promotion by TiO x are additive. TiO x promotion of catalysts with small particles and the presence of unpromoted large particles allow reaching of selectivities to crotylalcohol of approximately 45%. Promotion of large Pt particles with TiO x yields 64% selectivity to crotylalcohol.

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Section: Introductionsupporting

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Structure Sensitivity of the Hydrogenation of Crotonaldehyde over Pt/SiO2and Pt/TiO2

Englisch

Jentys

Lercher

1997

Journal of Catalysis

299

214

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“…In the case of Pt catalysts, it has been suggested [30]- [32] that a similar effect is caused by electron transfer from the doped metal to the active metals, thereby increasing the electron density at the active metal site and decreasing the probability of -C=C-bond hydrogenation by lowering the interaction between -C=C-bonds and the metal.…”

Section: Effect Of Nahco 3 Na 2 Co 3 and K 2 Co 3 Concentrationmentioning

confidence: 99%

Effect of Alkali Carbonate/Bicarbonate on Citral Hydrogenation over Pd/Carbon Molecular Sieves Catalysts in Aqueous Media

Krishna

Ramakrishna

Soni

et al. 2016

MRC

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The efficient citral hydrogenation was achieved in aqueous media using Pd/CMS and alkali additives like K 2 CO 3 . The alkali concentrations, reaction temperature and the Pd metal content were optimized to enhance the citral hydrogenation under aqueous media. In the absence of alkali, citral hydrogenation was low and addition of alkali promoted to ~92% hydrogenation without reduction in the selectivity to citronellal. The alkali addition appears to be altered the palladium sites. The pore size distribution reveals that the pore size of these catalysts is in the range of 0.96 to 0.7 nm. The palladium active sites are also quite uniform based on the TPR data. The catalytic parameters are correlated well with the activity data.

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“…The selective hydrogenation of cinnamaldehyde (CALD) [14][15][16] to hydrocinnamaldehyde (HCALD) is of interest for avor and fragrance industries. 17 Moreover, the reaction is structure-sensitive, as its performance depends on the type of exposed crystallographic planes, 18-21 the nature and size of the metallic NPs, 17,19,[22][23][24][25][26] and the nature of the support. 22,23 Some studies have shown the interest of using TiO 2 as a support for modifying the activity and the selectivity of Au NPs.…”

mentioning

confidence: 99%

“…17 Moreover, the reaction is structure-sensitive, as its performance depends on the type of exposed crystallographic planes, 18-21 the nature and size of the metallic NPs, 17,19,[22][23][24][25][26] and the nature of the support. 22,23 Some studies have shown the interest of using TiO 2 as a support for modifying the activity and the selectivity of Au NPs. 27 Goldbased bimetallic NPs considered up to now for this reaction are AuPd, 28,29 AuCu, 30 and AuNi 31 systems.…”

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confidence: 99%

Monitoring in situ the colloidal synthesis of AuRh/TiO₂ selective-hydrogenation nanocatalysts

et al. 2017

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AuRh nanoparticles (NPs) of various compositions and sizes in the 2-4 nm range were synthesized using a colloidal approach and were characterized at each preparation step by dynamic light scattering (DLS), ultraviolet-visible (UV-vis) spectroscopy, and liquid-phase transmission electron microscopy (liquid TEM).The AuRh colloids appear relatively instable, leading to their gradual coalescence. After fast immobilization of the metallic nanoparticles on rutile TiO 2 nanorods, the materials were investigated by high-resolution transmission electron microscopy (HRTEM) and low-temperature CO adsorption monitored by Fourier transform infrared (FTIR) spectroscopy. The inherent lack of miscibility between Au and Rh leads to partial segregation inside the NPs, which is further exalted after a reducing thermal treatment applied for PVA removal. The catalytic properties in the liquid-phase selective hydrogenation of cinnamaldehyde to hydrocinnamaldehyde are strongly influenced by these nanostructural modifications. While in as-prepared samples the intermixing between Au and Rh phases promotes the catalytic performances for Rh-rich AuRh catalysts through Au-induced stabilization of Rh in its metallic form, segregation into Janus particles after reduction decreases the catalytic activity.Bimetallic nanoparticles are of prominent importance in heterogeneous catalysis since the choices of metals and compositions allow one to tune the catalyst selectivity and improve its activity and stability.

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Liquid phase hydrogenation of cinnamaldehyde over supported ruthenium catalysts: Influence of particle size, bimetallics and nature of support

Cited by 89 publications

References 20 publications

Structure Sensitivity of the Hydrogenation of Crotonaldehyde over Pt/SiO2and Pt/TiO2

Structure Sensitivity of the Hydrogenation of Crotonaldehyde over Pt/SiO2and Pt/TiO2

Effect of Alkali Carbonate/Bicarbonate on Citral Hydrogenation over Pd/Carbon Molecular Sieves Catalysts in Aqueous Media

Monitoring in situ the colloidal synthesis of AuRh/TiO₂ selective-hydrogenation nanocatalysts

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Liquid phase hydrogenation of cinnamaldehyde over supported ruthenium catalysts: Influence of particle size, bimetallics and nature of support

Cited by 89 publications

References 20 publications

Structure Sensitivity of the Hydrogenation of Crotonaldehyde over Pt/SiO2and Pt/TiO2

Structure Sensitivity of the Hydrogenation of Crotonaldehyde over Pt/SiO2and Pt/TiO2

Effect of Alkali Carbonate/Bicarbonate on Citral Hydrogenation over Pd/Carbon Molecular Sieves Catalysts in Aqueous Media

Monitoring in situ the colloidal synthesis of AuRh/TiO2 selective-hydrogenation nanocatalysts

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Monitoring in situ the colloidal synthesis of AuRh/TiO₂ selective-hydrogenation nanocatalysts