Activity and selectivity of Pd/α-Al2O3 for ethyne hydrogenation in a large excess of ethene and hydrogen

Aduriz, H. R.; Bodnariuk, P.; Dennehy, Mariana; Gigola, Carlos Eugenio

doi:10.1016/s0166-9834(00)82292-7

Cited by 73 publications

(32 citation statements)

References 18 publications

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“…3a), and the S E decreases dramatically with the increase of reaction temperature (curve a of Fig. 3b), which is in agreement with the literature results [7,[33][34][35][36]. However, for I-Pd/MSiO 2 catalyst, it is striking that both the ethylene selectivity (from 24 to 68%, curve b of Fig.…”

Section: Betsupporting

confidence: 90%

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Unusual Catalytic Performance for Selective Acetylene Hydrogenation over Pd Nanoparticles Fabricated on N,O-containing Organic Groups Modified Silica

Wang

Chen

et al. 2008

Catal Lett

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A novel Pd-based catalyst, small Pd nanoparticles (1-2 nm) fabricated on N,O-containing organic groups modified silica, exhibits unusual catalytic performance for selective hydrogenation of acetylene, that is, the ethylene selectivity rises significantly with the increase of acetylene conversion regardless of the variation of reaction temperature or hydrogen partial pressure until 100% acetylene conversion. The in situ DRIFTS spectra of CO adsorption show that the organic groups presented on the silica affect the electronic property of the very small Pd nanoparticles.

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Section: Betsupporting

confidence: 90%

“…3a) increase with the rising reaction temperature, which is drastically different from that of Pd/C-SiO 2 (curve a of Fig. 3b) and the results shown in literatures [7,[33][34][35][36]. Numerous previous work [2,3,6] have demontrated that the coke deposition can lead to the increase of ethylene selectivity.…”

Section: Betmentioning

confidence: 58%

Unusual Catalytic Performance for Selective Acetylene Hydrogenation over Pd Nanoparticles Fabricated on N,O-containing Organic Groups Modified Silica

Wang

Chen

et al. 2008

Catal Lett

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“…Using this equation to calculate the reaction rate under the conditions used by Rupprechter [25], using 5 mbar of H 2 , 5 mbar of C 2 H 4 using a Pd(111) sample leads to a value of $0.3 reactions/site/s, in reasonable agreement with the experimental value of $1/site/s obtained in that work. The general ethylene hydrogenation pathway has been well established with atomic hydrogen reacting sequentially with adsorbed ethylene to form ethane [1][2][3][4][5][6][7][8] in the so-called Horiuti-Polanyi model [31,32]. The hydrogen reaction order is greater than unity at temperatures above 300 K and a value of $0.66 has been measured at 243 K on silica-supported palladium [29].…”

Section: Discussionmentioning

confidence: 99%

“…The catalytic hydrogenation of ethylene has been studied for many years, where the general reaction pathway, involving the sequential addition of atomic hydrogen across the carbon-carbon double bond, is well established [1][2][3][4][5][6][7][8]. More recently, surface science studies in ultrahigh vacuum of ethylene on Pd(111) single crystals [9][10][11][12][13] and palladium nanoparticles supported on planar alumina substrates [14][15][16][17] have yielded additional insights into the chemistry at the surface.…”

Section: Introductionmentioning

confidence: 99%

The kinetics of ethylene hydrogenation catalyzed by metallic palladium

2005

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The activity of Pd(111) for ethylene hydrogenation is measured using a high-pressure reactor incorporated into an ultrahigh vacuum chamber for temperatures between 300 and 475 K, ethylene pressures between 50 and 300 Torr and hydrogen pressures from 45 to 600 Torr. The reaction rate is found to be rapid with turnover frequencies up to $400 reactions/site/s (where rates are referenced to the atom site density on the (111) face of palladium). The measured activation energy is $35 kJ/mol. A hydrogen reaction order of $1.02 was found at a reaction temperature of 300 K and an ethylene pressure of 100 Torr, where the hydrogen reaction order was found to depend on temperature. A negative reaction order of $)0.22 was found in ethylene pressure at a reaction temperature of 320 K and a hydrogen pressure of 100 Torr. The reaction rates are in good agreement with values obtained on silica-supported palladium and with other work on palladium single crystals.

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“…The selectivity of Pd catalysts towards ethylene is known to be governed by a large difference in the adsorption strength between acetylene and ethylene [32][33][34][35]. According to Gigola et al [25], who studied the influence of Pd particle size on the hydrogenation of C 2 H 2 over Pd/Al 2 O 3 , a metal dispersion under 0.2 is required for a high ethylene selectivity.…”

Section: Catalytic Performances Of Pd/cnf/smf Inconelmentioning

confidence: 99%

Palladium on carbon nanofibers grown on metallic filters as novel structured catalyst

Tribolet

Kiwi‐Minsker

2005

Catalysis Today

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A novel composite material based on carbon nanofibers (CNF) grown on sintered metal fibers (SMF Inconel ) filter was investigated for its favorable properties as catalytic support. The CNF were formed directly over the SMF Inconel by thermal (650 8C) chemical vapor deposition of ethane-hydrogen mixture. The CNF/SMF Inconel composite consists of metal fibers entangled by CNF network of microns thickness and strongly anchored to the metal surface. The properties of the CNF/SMF Inconel were controlled by the synthesis conditions. The CNF coating reduced the filter porosity and decreased the material permeability, but the pressure drop during the gas passage through the reactor remained low for CNF fraction <10%. Palladium was deposited on CNF previously activated by boiling in hydrogen peroxide. The activity and selectivity of Pd8/CNF/SMF Inconel catalysts were tested in the selective hydrogenation of acetylene and compared with Pd supported on activated carbon fibers (Pd8/ACF). The TOF was one order of magnitude higher for Pd8/CNF/SMF Inconel as compared to Pd8/ACF. This effect was attributed to a strong metal-support interaction of Pd8-nanoparticles with the graphitized CNF. The reaction was found to be structure sensitive leading to a decrease of TOF for the Pd8-particles <3 nm. #

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Activity and selectivity of Pd/α-Al2O3 for ethyne hydrogenation in a large excess of ethene and hydrogen

Cited by 73 publications

References 18 publications

Unusual Catalytic Performance for Selective Acetylene Hydrogenation over Pd Nanoparticles Fabricated on N,O-containing Organic Groups Modified Silica

Unusual Catalytic Performance for Selective Acetylene Hydrogenation over Pd Nanoparticles Fabricated on N,O-containing Organic Groups Modified Silica

The kinetics of ethylene hydrogenation catalyzed by metallic palladium

Palladium on carbon nanofibers grown on metallic filters as novel structured catalyst

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