Catalytic hydrogenation of alkyne and alkadiene impurities from alkenes. Practical and theoretical aspects

Николаев, С. А.; Занавескин, Л. Н.; Смирнов, В. В.; Aver’yanov, V. A.; Занавескин, К. Л.

doi:10.1070/rc2009v078n03abeh003893

Cited by 195 publications

(144 citation statements)

References 102 publications

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“…The shift of the average particle size to higher values was detected in bimetallic samples in comparison with corresponding monometallic ones ( Table 1). The observed trend could be caused by the formation of decorated M 1 /M 2 clusters, whose sizes are larger than M 1 and M 2 [3][4][5]14]. The presence of NiO/Au particles in the bimetallic samples was confirmed by the TEM-EDX analysis.…”

Section: Resultsmentioning

confidence: 69%

“…The TOFs of 3 nm NiO particles are lower by Table 1). The negative-size effect of activity is the known feature of Pd, Pt, and Ni catalysts attributed to irreversible adsorption of unsaturated compounds on small clusters [3,4,10]. According to data presented in del Angel et al [26], the TOF of Pt and Pd clusters decreases from 780 to 480 and from 9,910 to 8,640 h −1 as the cluster size decreases from 12 to 3 and from 10 to 3 nm, respectively.…”

Section: Resultsmentioning

confidence: 95%

“…The average particle size in NiO/Al 2 O 3 , NiO/TiO 2 , NiO/ZnO, and NiO/ZrO 2 was 3, 4.5, 7, and 7 nm, respectively ( Table 1). The increase in particle size of NiO during transition from Al 2 O 3 to ZrO 2 could be caused by the decrease of the surface area of a support, which favors segregation of clusters during the calcination [3][4][5]. The shape of the NiO particles, deposited on Al 2 O 3 , was nearly spherical (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Even such a small content of ethyne impurities quickly poisons Ziegler-Natta polymerization catalysts [2,3]. Thus, preliminary removal of alkynes via hydrogenation is necessary [1][2][3][4] . Traditionally, the Ag/Pd catalysts HO-21 (BASF), G-58, and G-83 (Süd-Chemie) are employed for the hydrogenation of С≡С bond to C0C bond.…”

Section: Introductionmentioning

confidence: 99%

“…However, turnover frequency (TOF) and stability of Ag/Pd catalysts are often low. Moreover, undesirable "green-oil" and ethane by-products are usually formed on palladium surface [3,4]. Nowadays, the studies directed to improving of catalytic properties of palladium-based catalysts are becoming less popular, giving way to the intensive searching for alternative and high-performance palladium-free catalysts for the ethyne hydrogenation [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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Sites for the selective hydrogenation of ethyne to ethene on supported NiO/Au catalysts

2012

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Au, NiO, and NiO/Au clusters of 2.5-16 nm, supported on Al 2 O 3 , ZrO 2 , TiO 2 , and ZnO, were studied in the purification of ethene feedstock from ethyne by hydrogenation at 357 K. The Au, NiO, and NiO/Au catalysts possessed 100 % selectivity to ethene. As the size of NiO clusters decreased from 7 to 3 nm, the turnover frequency (TOF) decreased from 812-1,023 to 276 h −1 . In contrast with NiO, Au activity increased with decreasing particle size. NiO/Au catalysts possessed higher stability and activity in comparison with Au and NiO catalysts. The synergistic gain on NiO/Au clusters (SG) calculated as TOF NiO/Au -TOF Au -TOF NiO was 1,466; 1,147; 563; and 569 h −1 for NiO/Au/Al 2 O 3, NiO/Au/TiO 2 , NiO/Au/ZnO, and NiO/Au/ ZrO 2 , respectively. The reasons of the observed catalytic trends and the origin of the most active and selective sites are discussed.

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Section: Resultsmentioning

confidence: 69%

Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sites for the selective hydrogenation of ethyne to ethene on supported NiO/Au catalysts

2012

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Electrochemical Hydrogenation of Organic Compounds: A Sustainable Approach

Jayan,

Thadathil,

Varghese

2023

Asian J Org Chem

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Conventional methods for hydrogenation of organic compounds generally use corrosive catalysts and reagents, along with extreme conditions like high temperatures and pressures. Quenching of corrosive materials does not deter its negative impact on the environment, nor is one safe when it comes to working with high temperature and pressure. Electrochemical hydrogenation has proven to be safe and green since most of the efficient reactions are conducted at ambient pressure and temperature, without or minimizing the use of toxic catalysts and corrosive reagents as compared to conventional methods. This review therefore presents the advances in electrochemical hydrogenation reactions of organic compounds, starting from simple aliphatic compounds to complex polyaromatics and heterocyclic aromatic compounds.

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Activation and Spillover of Hydrogen on Sub‐1 nm Palladium Nanoclusters Confined within Sodalite Zeolite for the Semi‐Hydrogenation of Alkynes

et al. 2019

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The search for efficient nontoxic catalysts able to perform industrial hydrogenations is a topic of interest, with relevance to many catalytic processes. Herein, we describe a mechanistic phenomenon for the activation and spillover of hydrogen for remarkable selectivity in the semi‐hydrogenation of acetylene over sub‐1 nm Pd nanoclusters confined within sodalite (SOD) zeolite (Pd@SOD). Specifically, hydrogen is dissociated on the Pd nanoclusters to form hydrogen species (i.e., hydrogen atoms and hydroxyl groups) that spill over the SOD surfaces. The design and utilization of the small‐pore zeolite SOD (six‐membered rings with 0.28×0.28 nm channels) is crucial as it only allows H2 diffusion into the channels to reach the encapsulated Pd nanoclusters and thus avoids over‐hydrogenation to form ethane. Pd@SOD exhibits an ethylene selectivity of over 94.5 %, while that of conventional Pd/SOD is approximately 21.5 %.

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Catalytic hydrogenation of alkyne and alkadiene impurities from alkenes. Practical and theoretical aspects

Cited by 195 publications

References 102 publications

Sites for the selective hydrogenation of ethyne to ethene on supported NiO/Au catalysts

Sites for the selective hydrogenation of ethyne to ethene on supported NiO/Au catalysts

Electrochemical Hydrogenation of Organic Compounds: A Sustainable Approach

Activation and Spillover of Hydrogen on Sub‐1 nm Palladium Nanoclusters Confined within Sodalite Zeolite for the Semi‐Hydrogenation of Alkynes

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