Effect of pretreatment with hydrogen on the structure and properties of carbon-supported Pd-Ag-nanoalloys for ethylene production by acetylene hydrogenation

Глыздова, Д. В.; Афонасенко, Т. Н.; Khramov, Evgeny V.; Леонтьева, Н. Н.; Тренихин, М. В.; Kremneva, Anna M.; Shlyapin, D. A.

doi:10.1016/j.mcat.2021.111717

Cited by 15 publications

(5 citation statements)

References 49 publications

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“…Catalysts based on Sibunit have been successfully used earlier in the processes of selective hydrogenation [24][25][26]. We have also previously shown that bimetallic Pd-Ga [4,27], Pd-Ag [28,29], and Pd-Zn [30,31] catalysts supported on Sibunit (C) exhibit high selectivity in the reaction of acetylene hydrogenation to ethylene, both in the liquid and gas phases.…”

Section: Introductionmentioning

confidence: 92%

Selective Hydrogenation of Acetylene over Pd-Co/C Catalysts: The Modifying Effect of Cobalt

et al. 2023

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Novel bimetallic Pd-Co catalysts supported on the carbon material Sibunit were synthesized by an incipient wetness impregnation method and used for ethylene production by selective acetylene hydrogenation. It has been established that an increase in the Pd:Co molar ratio from 1:0 to 1:2 in 0.5%Pd-Co/C catalysts, treated in hydrogen at 500 °C, leads to an increase in the ethylene selectivity from 60 to 67% (T = 45 °C). The selectivity does not change with a further increase in the modifier concentration. The catalysts were investigated by TPR-H2, XRD, TEM HR, EDS, and XPS methods. It was shown that palladium and cobalt in the 0.5%Pd-Co/C samples form Pd(1−x)Cox phases of solid solutions with different compositions depending on the Pd:Co ratio. The cobalt concentration in the Pd-Co particles increases with an increase in the Pd:Co ratio up to 1:2 and then remains at a constant level. In addition, monometallic Co particles were present in the samples with the Pd:Co ratio higher then 1:2. The optimal combination of catalytic properties (the ethylene yield is 62–63%) is typical for catalysts with a Pd:Co molar ratio of 1:2–1:4. which is mainly due to the presence of bimetallic particles containing ~41–43% by at. of cobalt.

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Section: Introductionmentioning

confidence: 92%

Selective Hydrogenation of Acetylene over Pd-Co/C Catalysts: The Modifying Effect of Cobalt

et al. 2023

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“…Ethylene is a key industrial chemical mainly derived from thermal cracking of hydrocarbons. − The cracked gas usually contains traces of acetylene which can deactivate the catalyst for downstream ethylene polymerization. − At the same time, acetylene will also cause quality degradation of polyethylene . Selective hydrogenation is the most economical and convenient way to handle the acetylene impurity in cracked gas, and has always attracted the attention of many researchers. , Meanwhile, acetylene hydrogenation is still a study of great potential application value in producing ethylene in countries where oil is scarce but rich in coal resources. , It can alleviate the dependence of these countries on crude oil to a large extent. In the process of acetylene semihydrogenation, preventing the intermediate product ethylene from being further hydrogenated to ethane has always been the crucial topic.…”

Section: Introductionmentioning

confidence: 99%

“…9,10 Meanwhile, acetylene hydrogenation is still a study of great potential application value in producing ethylene in countries where oil is scarce but rich in coal resources. 11,12 It can alleviate the dependence of these countries on crude oil to a large extent. In the process of acetylene semihydrogenation, preventing the intermediate product ethylene from being further hydrogenated to ethane has always been the crucial topic.…”

Section: ■ Introductionmentioning

confidence: 99%

Effective Inhibition of Ethane Generation on Fe₅C₂ Nanoparticles Doped with ppm Level of Pd for Selective Hydrogenation of Acetylene

Sun

Wang

Zhang

2022

Ind. Eng. Chem. Res.

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Overhydrogenation to ethane is most undesired in selective hydrogenation of acetylene. Monometallic Pd supported on common oxide supports such as alumina and silica suffers from susceptibility of ethane formation, and the ethylene selectivity is usually unsatisfactory. Herein, Fe5C2 was carefully synthesized and employed as a new kind support doped with a (5–600) ppm level of Pd for selective hydrogenation of acetylene. The catalyst with appropriate Pd loadings exhibited more efficient ethane suppression and much higher ethylene selectivity than the traditional α-Al2O3 supported Pd catalyst, with full acetylene conversion under 240 °C, and maintained good stability after a 200 h tolerance test. Characterization and DFT calculation results reveal that the excellent ethylene selectivity is mainly derived from the special interaction between Pd atoms and the Fe5C2 support. Hydrogenation of ethylene to ethane needs to cross extremely high activation energy barriers on the catalyst surface, and ethylene desorption more easily occurs on it. Doping the appropriate amount of Pd atoms on the Fe5C2 surface can increase the obstacle for polymerization and will cause the unsaturated C2 species to be more inclined to be hydrogenated into C2H4. This synergy effect also acts as a guide in alkane suppression for selective hydrogenation of other alkynes.

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“…Supported bimetallic catalysts based on palladium are widely used for practically important hydrocarbon conversion reactions such as hydrogenation, dehydrogenation, methanol steam reforming, oxidation processes, hydrodeoxygenation etc. [1][2][3][4][5][6][7][8] The traditional synthesis scheme of such catalysts includes the deposition of the active component precursors on the support, followed by the stages of drying and heat treatment. Reductive treatment is the most important procedure, since the decomposition of the precursors and their interaction with each other, as well as the formation of the morphology and size of the catalyst particles are occur.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Reductive Treatment Duration on the Structure and Properties of Pd−Zn/C Catalysts for Liquid‐Phase Acetylene Hydrogenation

et al. 2022

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Structural features of bimetallic PdÀ Zn catalysts supported on Sibunit carbon material were studied by EXAFS, TEM, XRD and XPS methods, depending on the heat treatment conditions in hydrogen. It was found that supported particles of PdZn intermetallic compound of tetragonal structure are formed in all samples. An increase in the duration of catalyst reduction in H 2 at 500 °C from 1 to 20 hours leads to an increase in the amount of PdZn intermetallic particles (d av = 2-3 nm), which is confirmed by the increasing of the PdÀ Zn coordination number from 2.4 to 4.3 and by the decreasing of the surface Pd 0 /PdZn ratio from 0.63 to 0.18. The observed changes in the nature and structure of active sites provide an increase in the ethylene selectivity of PdÀ Zn/C catalysts in liquid-phase acetylene hydrogenation.

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Effect of pretreatment with hydrogen on the structure and properties of carbon-supported Pd-Ag-nanoalloys for ethylene production by acetylene hydrogenation

Cited by 15 publications

References 49 publications

Selective Hydrogenation of Acetylene over Pd-Co/C Catalysts: The Modifying Effect of Cobalt

Selective Hydrogenation of Acetylene over Pd-Co/C Catalysts: The Modifying Effect of Cobalt

Effective Inhibition of Ethane Generation on Fe₅C₂ Nanoparticles Doped with ppm Level of Pd for Selective Hydrogenation of Acetylene

Effect of Reductive Treatment Duration on the Structure and Properties of Pd−Zn/C Catalysts for Liquid‐Phase Acetylene Hydrogenation

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Effect of pretreatment with hydrogen on the structure and properties of carbon-supported Pd-Ag-nanoalloys for ethylene production by acetylene hydrogenation

Cited by 15 publications

References 49 publications

Selective Hydrogenation of Acetylene over Pd-Co/C Catalysts: The Modifying Effect of Cobalt

Selective Hydrogenation of Acetylene over Pd-Co/C Catalysts: The Modifying Effect of Cobalt

Effective Inhibition of Ethane Generation on Fe5C2 Nanoparticles Doped with ppm Level of Pd for Selective Hydrogenation of Acetylene

Effect of Reductive Treatment Duration on the Structure and Properties of Pd−Zn/C Catalysts for Liquid‐Phase Acetylene Hydrogenation

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Effective Inhibition of Ethane Generation on Fe₅C₂ Nanoparticles Doped with ppm Level of Pd for Selective Hydrogenation of Acetylene