Hydrogenation activity and selectivity behavior of supported palladium nanoparticles

Nadgeri, Jayprakash M.; Telkar, M.M.; Rode, Chandrashekhar V.

doi:10.1016/j.catcom.2007.07.023

Cited by 47 publications

(38 citation statements)

References 20 publications

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“…Effect of concen tration of solvent and screening of various stabilizers was also investigated in our work 39) . Due to the inherent advantages of heterogeneous cat alysts, recently Nadgeri et al have reported supported Pd nanoparticles in a narrow range of 3-5 nm for B3D hydrogenation 43) . SEM (scanning electron micro scope) of the sample after the deposition of Pd sol on the carbon support clearly showed the palladium parti cles dispersed on the support which was also confirmed by a simultaneous EDX (electron dispersive X-ray fluo rescence spectrometer) of the same sample with small particles as a focus was taken and a plot of energy of X-rays emitted versus intensity is shown in Fig.…”

Section: Palladium Nano Catalystsmentioning

confidence: 99%

Catalytic Hydrogenation of 2-Butyne-1,4-diol: Activity, Selectivity and Kinetics Studies

Rode

2008

J. Jpn. Petrol. Inst.

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The reaction pathway for hydrogenation of 2-butyne-1,4-diol involves parallel and consecutive isomerization as well as hydrogenation reactions forming other side products along with cis-2-butene-1,4-diol and butane-1,4-diol. Hence, achieving the highest selectivity to butene-and/or butanediol is critical from industrial point of view. Hydrogenation of butynediol is also of fundamental significance, due to its adsorption characteristics leading to the formation of active species and their role in determining the product distribution. Studies on designing various catalyst systems including colloidal as well supported palladium nanoparticles for the hydrogenation of butynediol, role of additives, catalyst pretreatment, kinetic studies carried out in our group has been presented in this review. Interestingly, almost complete selectivity to the intermediate olefinic diol was achieved with 1％ Pd/CaCO3 _ NH3 catalyst system. This could be due to the competitive adsorption of ammonia on the palladium surface along with the substrate 2-butyne-1,4-diol. Studies on catalyst pretreatment and kinetics using palladium catalyst have also been presented here. Nanostructure palladium both colloidal as well as supported catalysts showed a very high catalytic activity (10-40 times more) in the hydrogenation 2-butyne-1,4-diol to cis-2-butene-1,4-diol compared with the corresponding conventional Pd catalysts. For platinum based catalysts, formation of side products was completely eliminated in the hydrogenation of butyne diol. The increase in the basic strength of alkali metal doped Pt catalysts measured by CO2-TPD, led to the increase in electron density of Pt hence, faster desorption and higher selectivity to butenediol. In the case of continuous hydrogenation, the selectivity pattern was completely different from that found in the case of batch slurry reactor and by varying the contact time, the selectivity to both butene-and butanediols could be varied over a wide range of conditions.

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Section: Palladium Nano Catalystsmentioning

confidence: 99%

Catalytic Hydrogenation of 2-Butyne-1,4-diol: Activity, Selectivity and Kinetics Studies

Rode

2008

J. Jpn. Petrol. Inst.

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“…The difference of the catalytic activity between the Pd and Pt nanaopartilcles might be from the different ability to the adsorption and split of H 2 at the metal surfaces during the liquid hydrogen of nitrobenzene. Interestingly, the bi-MNPs of Pt and Pd supported on PMO-SBA-15 with the same metal loading as the monometallic Pt or Pd nanoparticles could improve the catalytic activity (entries [4][5][6][7][8]. The increased catalytic activity should be attributed to the synergic effects between the particles of Pt and Pd interaction during the hydrogenation.…”

Section: Samples Characterizationmentioning

confidence: 95%

“…Both liquid phase and vapor phase hydrogenation methods were often employed to provide the anilines, but the common drawbacks was that the hydrogenation required to be performed at high pressure and/or high reaction temperature [3][4][5][6]. Therefore, the design of a catalyst, which can work under mild reaction conditions and give high catalytic performances, should be very interesting [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Pt–Pd bi-metal nanoparticles captured and stabilized by imine groups in a periodic mesoporous organosilica of SBA-15 for hydrogenation of nitrobenzene

Liu¹,

Tan²,

Yu³

et al. 2010

Microporous and Mesoporous Materials

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“…The peak broadening is also consistent with the nanoscale structural features of the Pd nanocrystals (Berger et al 2010). It is observed that in PVP-stabilized nanoparticles, the agglomeration of Pd particle is prevented under reduction condition and the Pd metal particles are finely dispersed on support (Nadgeri et al 2008). …”

Section: X-ray Diffractionmentioning

confidence: 99%

“…Preparation of catalysts 1 % Pd/SiO 2 and 1 % Pd/Al 2 O 3 supported nanocatalysts were synthesized as described previously (Nadgeri et al 2008) by the reduction of the Pd ions with ethanol using poly (N-vinyl pyrrolidone, PVP) as a stabilizer. Palladium sol was prepared from a solution containing 0.134 g PdCl 2 (Aldrich, [99 %) in 15 ml of aqueous HCl and 5.448 g of PVP as a stabilizer.…”

Section: Methodsmentioning

confidence: 99%

Catalytic oxidation of carbon monoxide over supported palladium nanoparticles

et al. 2015

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Catalytic oxidation of CO with ozone had been studied over Al 2 O 3 and SiO 2 supported Pd nanoparticles which was synthesized by two different methods. The polyol method mainly resulted in highly dispersed Pd particles on the support, while the impregnation method resulted in agglomeration Pd particles on the support. Supported Pd nanoparticles synthesized from PdCl 2 in the presence of poly (N-vinylpyrrolidone) (PVP) by chemical reduction. The catalysts were characterized by X-ray diffraction, N 2 BET surface area, pore size distributions, CO chemisorption, TEM and H 2 -temperature programmed reduction. The physico-chemical properties were well correlated with activity data. Characterizations of XRD and TEM show that the surface Pd nanoparticles are highly dispersed over Al 2 O 3 and SiO 2 . The catalytic activity was dependent upon ozone/CO ratio, contact times, and the reaction temperature. The extent of carbon monoxide oxidation was proportional to the catalytically ozone decomposition. The PVP synthesized Pd/A 2 O 3 catalyst had been found to be highly active for complete CO removal at room temperature. The higher activity of the nanocatalyst was attributed to small particle size and higher dispersion of Pd over support.

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Hydrogenation activity and selectivity behavior of supported palladium nanoparticles

Cited by 47 publications

References 20 publications

Catalytic Hydrogenation of 2-Butyne-1,4-diol: Activity, Selectivity and Kinetics Studies

Catalytic Hydrogenation of 2-Butyne-1,4-diol: Activity, Selectivity and Kinetics Studies

Pt–Pd bi-metal nanoparticles captured and stabilized by imine groups in a periodic mesoporous organosilica of SBA-15 for hydrogenation of nitrobenzene

Catalytic oxidation of carbon monoxide over supported palladium nanoparticles

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