[PdCl2(NH2(CH2)12CH3)2] supported on an active carbon: effect of the carbon properties on the catalytic activity of cyclohexene hydrogenation

Díaz-Auñón, J.A.; Román-Martı́nez, M.C.; Lecea, C. Salinas-Martı́nez de; L’Argentière, Pablo C.; Cagnola, Edgardo; Liprandi, Domingo; Quiroga, Mónica

doi:10.1016/s1381-1169(99)00355-6

Cited by 35 publications

(11 citation statements)

References 32 publications

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“…These values are like those reported by other authors for this support. 44,48 The DRIFT-Py spectra of the Al 2 O 3 , Al 2 O 3 -Mg, and RX3 supports showed the vibrational bands at ca. 1540 and 1450 cm −1 corresponding to Brönsted and Lewis acidic sites, 49 respectively (Supporting Information, Fig.…”

Section: Support Characterizationmentioning

confidence: 96%

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Role of the support and chloride during the purification of 1‐pentene in alkyne/alkene streams over Pd catalysts

Cordoba

Betti

Bovier

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND: Pd nanoparticles over different supports were evaluated during the alkyne selective hydrogenation of medium chain (C 7 and C 5 ) and the 1-pentene purification at mild operational conditions (150 kPa and 303 K). The role of support and chloride was investigated; γ-Al 2 O 3 , γ-Al 2 O 3 modified with Mg, CaCO 3 and activated carbon were used as supports, and PdCl 2 as precursor salt. The classical Lindlar catalyst was used as reference.RESULTS: Surface acidity of supports, active sites dispersion and surface species (MgO, Pd x Cl y O z and/or functional groups) can favor or disfavor the desorption of 1-alkene during the purification of 1-pentene stream. The smallest particle sizes (3.8-10.0 nm) favor the dissociative adsorption of hydrogen over Pd°active sites, promoting good catalytic behavior. The best synthesized catalysts are Pd/Al-Mg and Pd/Ca, and their high selectivity (≥90%) is favored by the presence of superficial acidic Lewis sites. On the contrary, lower selectivity (74-80%) is assessed on catalysts with Brönsted acidic sites (Pd/Al and Pd/RX3) that favored the undesired overhydrogenation or isomerization reactions. CONCLUSION:The geometric and electronic properties of the support have a major influence on the activity and selectivity of the catalysts. Low loaded Pd catalysts supported on Al 2 O 3 -Mg and CaCO 3 (Pd/Al-Mg, Pd/Ca) can be used for the purification of medium or large terminal alkenes at mild reaction conditions as an alternative to the toxic Lindlar commercial catalyst.

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Section: Support Characterizationmentioning

confidence: 96%

“…S1(a)). RX3 support (activated carbon) presents both types I and IV isotherms with a H4 hysteresis loop at higher relative pressures, which is associated with different porosities ranging from micropore to mesopore [43][44][45] (Supporting Information, Fig. S1(a)).…”

Section: Support Characterizationmentioning

confidence: 99%

Role of the support and chloride during the purification of 1‐pentene in alkyne/alkene streams over Pd catalysts

Cordoba

Betti

Bovier

et al. 2021

J of Chemical Tech & Biotech

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“…From Dubinin-Radushkevich equation to the CO 2 isotherm at 273 K, it is possible to obtain the micropore volume (V micro ), while the supermicropore volume (V sm ) is attained by the subtraction of V micro to the volume calculated by the same equation but applied to the N 2 adsorption isotherm at 77 K. By mercury porosimetry using a Carlo Erba 2000 equipment, macropore volume (V macro ) and part of the mesopore volume (V meso ) were determined. The rest of V meso was obtained from N 2 adsorption isotherm and Hg porosimetry as described previously [17].…”

Section: Catalysts Characterizationmentioning

confidence: 99%

Alkyne Selective Hydrogenation with Mono- and Bimetallic- Anchored Catalysts

Lederhos¹,

Betti²,

Liprandi³

et al. 2017

New Advances in Hydrogenation Processes - Fundamentals and Applications

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Partial hydrogenation of alkynes has industrial and academic relevance on a large scale; industries such as petrochemical, pharmacological and agrochemical use these compounds as raw material. Finding an economic, active and selective catalyst for the production of alkenes through partial hydrogenation of alkynes is thus an important challenge. Mono-and bimetallic catalysts (palladium, ruthenium and nickel) were synthetized by the incipient wetness technique using gamma alumina and an activated carbon as supports. The catalysts were characterized by inductively coupled plasma, hydrogen chemisorption, temperature-programmed reduction and X-ray photoelectronic spectroscopy (XPS). The objective of this work is to study 1-heptyne-selective hydrogenation using supported catalysts influenced by different factors: (a) pretreatment reduction temperature, (b) reaction temperature, (c) type of support, (d) metal loading, (e) precursor salt and (f) addition of a second metal to monometallic palladium catalyst. The Lindlar commercial catalyst, commonly used in these types of reactions, was used for comparative purposes. XPS technique allowed verifying that the presence of electron-deficient species on the catalyst surface with high metal loading affects the conversion and selectivity to the desired product. Nevertheless, the influence of geometrical effects and/or mixed active sites in the catalysts, as well as metal-metal and metal-support interactions, cannot be neglected.

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“…e amount of surface oxygen groups of carbonaceous supports, estimated by CO, CO 2 , and O 2 evolved in TPD experiments ( Table 1), shows that the oxidizing treatment with HNO 3 produces a large amount of surface oxygenated complexes, with 175% higher amount of carboxylic-type groups that decompose to give CO 2 under the heat treatment [28]. is enhancement is also observed in the TPD profile in Figure 1(b).…”

Section: Catalysts and Support Characterizationmentioning

confidence: 73%

High-Active Metallic-Activated Carbon Catalysts for Selective Hydrogenation

Carrara

Betti

Coloma

et al. 2018

International Journal of Chemical Engineering

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A series of low-loaded metallic-activated carbon catalysts were evaluated during the selective hydrogenation of a medium-chain alkyne under mild conditions. e catalysts and support were characterized by ICP, hydrogen chemisorption, Raman spectroscopy, temperature-programmed desorption (TPD), temperature-programmed reduction (TPR), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR micro-ATR), transmission electronic microscopy (TEM), and X-ray photoelectronic spectroscopy (XPS). When studying the effect of the metallic phase, the catalysts were active and selective to the alkene synthesis. NiCl/C was the most active and selective catalytic system. Besides, when the precursor salt was evaluated, PdN/C was more active and selective than PdCl/C. Meanwhile, alkyne is present in the reaction media, and geometrical and electronic effects favor alkene desorption and so avoid their overhydrogenation to the alkane. Under mild conditions, nickel catalysts are considerably more active and selective than the Lindlar catalyst.

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[PdCl2(NH2(CH2)12CH3)2] supported on an active carbon: effect of the carbon properties on the catalytic activity of cyclohexene hydrogenation

Cited by 35 publications

References 32 publications

Role of the support and chloride during the purification of 1‐pentene in alkyne/alkene streams over Pd catalysts

Role of the support and chloride during the purification of 1‐pentene in alkyne/alkene streams over Pd catalysts

Alkyne Selective Hydrogenation with Mono- and Bimetallic- Anchored Catalysts

High-Active Metallic-Activated Carbon Catalysts for Selective Hydrogenation

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