Selective hydrogenation of cinnamaldehyde over Pd/SiO2 catalysts: selectivity promotion by alloyed Sn

Hammoudeh, Ayman; Mahmoud, Sabri S.

doi:10.1016/s1381-1169(03)00378-9

Cited by 43 publications

(41 citation statements)

References 32 publications

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“…According to the literature [51][52][53][54][55], the other products possibly include 1-phenylpropane [51][52][53][54], β-methyl styrene [51][52][53][54], cinnamic acid [54,55], cinnamyl formate [54,55], benzyl cinnamate [54,55], 1-(3-propoxyprop-1-enyl)benzene [55], 4,4-diphenylcyclohexa-1,5-dienyl acetate [55], and other condensation products that could not be identified by gas chromatography-mass spectrometer (GC-MS) due to their large molecular weights [55]. Moreover, very little COL was observed for the 0.2%Pd/SBA-15 and 0.2%Pd-x%Ni/SBA-15 catalysts, similar to what has been previously reported on Pd catalysts [56,57]. Therefore, it is obvious that the introduction of Ni can evidently enhance the catalytic performance of Pd on SBA-15 for CAL conversion and HALD selectivity.…”

Section: Hydrogenation Of Cal To Hald Over Pd-ni/sba-15supporting

confidence: 82%

Improvement Effect of Ni to Pd-Ni/SBA-15 Catalyst for Selective Hydrogenation of Cinnamaldehyde to Hydrocinnamaldehyde

et al. 2018

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Abstract:A series of Pd-Ni bimetallic catalysts supported on SBA-15 (0.2%Pd-x%Ni/SBA-15, x = 0.4, 0.7, and 1.2) were prepared through the impregnation method combined with the NaBH 4 reduction method. X-ray diffraction (XRD), N 2 adsorption-desorption, X-ray photoemission spectroscopy (XPS) and transmission electron microscope (TEM) were used to characterize the prepared catalysts. All the synthesized catalysts were evaluated for the liquid-phase hydrogenation of cinnamaldehyde (CAL). The addition of Ni obviously enhanced the CAL conversion and selectivity of C=C hydrogenation to hydrocinnamaldehyde (HALD) over the 0.2%Pd-x%Ni/SBA-15 catalysts. Meanwhile, 0.2%Pd-1.2%Ni/SBA-15 showed the best performance with 96.3% conversion and 87.8% selectivity toward HALD. This improvement was attributed to the synergistic effect between the Pd and Ni nanoparticles, enhancing the dispersion of Pd metal particles and increasing the content of surface Pd 0 species. In addition, the influences of a few reaction factors including H 2 pressure, reaction temperature, and reaction time were studied over 0.2%Pd-1.2%Ni/SBA-15.

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Section: Hydrogenation Of Cal To Hald Over Pd-ni/sba-15supporting

confidence: 82%

Improvement Effect of Ni to Pd-Ni/SBA-15 Catalyst for Selective Hydrogenation of Cinnamaldehyde to Hydrocinnamaldehyde

et al. 2018

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“…Upon formation of an Sn-enriched Pd 2 Sn monolayer surface alloy at higher annealing temperatures, the CO chemisorption decreases drastically due to the associated reduction of the number of available active "Pd 3 " ensembles [41]. Similarly, the presence of Pd 2 Sn has shown to strongly suppress the activity in cinnamaldehyde hydrogenation [6]. In addition, formation of Sn-enriched Pd-Sn phases was also suspected to decrease the activity of PdSnO 2 catalysts in crotonaldehyde hydrogenation [5].…”

Section: Catalytic Characterizationmentioning

confidence: 99%

“…At least for catalytic studies this also includes Pd-based systems and specifically, also Pd-Sn bimetallics and compounds [2][3][4][5][6][7][8][9][10]. From the catalytic point of view, Pd-Sn catalysts have been exploited in a number of reactions, including e.g.…”

Section: Introductionmentioning

confidence: 99%

Origin of different deactivation of Pd/SnO2 and Pd/GeO2 catalysts in methanol dehydrogenation and reforming: A comparative study

Lorenz

Zhao

Turner

et al. 2010

Applied Catalysis A: General

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Pd particles supported on SnO2 and GeO2 have been structurally investigated by X-ray diffraction, (High-Resolution) transmission and scanning electron microscopy after different reductive treatments to monitor the eventual formation of bimetallic phases and catalytically tested in methanol dehydrogenation/reforming. For both oxides this included a thin film sample with well-defined Pd particles and a powder catalyst prepared by incipient wetness impregnation. The hexagonal and the tetragonal polymorph were studied for powder GeO2. Pd2Ge formation was observed on all GeO2-supported catalysts, strongly depending on the specific sample used. Reduction of the thin film at 573 K resulted in full transformation into the bimetallic state. The partial solubility of hexagonal GeO2 in water and its thermal structural instability yielded Pd2Ge formation at 473 K, at the cost of a structurally inhomogeneous support and Ge metal formation at higher reduction temperatures. Pd on tetragonal GeO2 entered a state of strong metal-support interaction after reduction at 573-673 K, resulting in coalescing Pd2Ge particles on a sintered and re-crystallized support, apparently partially covering the bimetallic particles and decreasing the catalytic activity. Pd2Ge on amorphous thin film and hexagonal GeO2 converted methanol primarily via dehydrogenation to CO and H2. At 573 K, formation of Pd2Sn and also PdSn occurred on the Pd/SnO2 thin film. Pd3Sn2 (and to some extent Pd2Sn) were predominantly obtained on the respective powder catalyst. Strong deactivation with increasing reduction temperature was observed, likely not based on the classical strong metal-support interaction effect, but rather on a combination of missing active structural ensembles on Sn-enriched bimetallic phases and the formation of metallic β-Sn. Correlations to Pd and its bimetallics supported on ZnO, Ga2O3 and In2O3 were also discussed.

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“…Different types of supported palladium catalysts such as Pd/carbon [31,32], Pd/SiO2 [33], Pd/Al2O3 [34], Pd/TiO2 [35], Pd/Fe2O3@C [36] have been reported to be efficient catalytic system for the hydrogenation of cinnamaldehyde. Graphene-supported Ni nanocatalyst shows selective hydrogenation towards C=C bond under atmospheric pressure [25].…”

Section: Introductionmentioning

confidence: 99%

Chemoselective hydrogenation of cinnamaldehyde at atmospheric pressure over combustion synthesized Pd catalysts

Das

Pal

Llorca

et al. 2017

Reac Kinet Mech Cat

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Selective hydrogenation of cinnamaldehyde over Pd/SiO2 catalysts: selectivity promotion by alloyed Sn

Cited by 43 publications

References 32 publications

Improvement Effect of Ni to Pd-Ni/SBA-15 Catalyst for Selective Hydrogenation of Cinnamaldehyde to Hydrocinnamaldehyde

Improvement Effect of Ni to Pd-Ni/SBA-15 Catalyst for Selective Hydrogenation of Cinnamaldehyde to Hydrocinnamaldehyde

Origin of different deactivation of Pd/SnO2 and Pd/GeO2 catalysts in methanol dehydrogenation and reforming: A comparative study

Chemoselective hydrogenation of cinnamaldehyde at atmospheric pressure over combustion synthesized Pd catalysts

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