Polymer-modified supported palladium catalysts for the hydrogenation of acetylene compounds

Жармагамбетова, А. К.; Seitkalieva, K. S.; Talgatov, E. T.; Auezkhanova, A. S.; Джардималиева, Г. И.; Pomogaĭlo, A. D.

doi:10.1134/s0023158416030174

Cited by 17 publications

(8 citation statements)

References 13 publications

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“…The catalysts were studied in phenylacetylene hydrogenation according to the procedure described in Ref. 25. The process was carried out in a thermostated glass reactor in an ethanol solution (25 mL) at 40°С and atmospheric pressure of hydrogen or hydrogen–helium gas mixture.…”

Section: Methodsmentioning

confidence: 99%

Behavior of Pd‐supported catalysts in phenylacetylene hydrogenation: Effect of combined use of polyvinylpyrrolidone and NaOH for magnetic support modification

Жармагамбетова¹,

Talgatov²,

Auyezkhanova³

et al. 2021

Polymers for Advanced Techs

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Recently, magnetic nanoparticles have attracted the attention as catalyst supports due to the possibility of magnetic separation, allowing for easy, fast, and clean recovery of the catalysts. A synthesis strategy of such supports plays an important role in improving the properties of the magnetic catalysts. Here, we proposed a simple and effective method to increase the activity and lifetime of the Pd magnetic catalyst. Polyvinylpyrrolidone‐maghemite nanoparticles were synthesized via one‐pot coprecipitation method using an excess of the NaOH. This was followed by adsorption of Pd2+ on the magnetic nanoparticles. The resulting catalyst showed activity (WCC = 4.0 × 10−6 mol s−1, WCC = 12.7 × 10−6 mol s−1) and selectivity (94%) in phenylacetylene hydrogenation. The catalyst was then magnetically recovered and reused 58 times. The activity of the catalyst increased significantly during the first three runs, changing the rate ratio of WCC to WCC from 1:3.2 to 1:1.6, and then decreased in the following runs. To understand the reason for this behavior, the catalyst was characterized, as well as catalytic studies were performed using similar catalysts for comparison. The results show that the NaOH adsorbed on magnetic support affects the size, stability, and catalytic properties of the Pd particles, and the effect of alkali is enhanced in the presence of the polymer.

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Section: Methodsmentioning

confidence: 99%

Behavior of Pd‐supported catalysts in phenylacetylene hydrogenation: Effect of combined use of polyvinylpyrrolidone and NaOH for magnetic support modification

Жармагамбетова¹,

Talgatov²,

Auyezkhanova³

et al. 2021

Polymers for Advanced Techs

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“…In the selective hydrogenation of alkynes, their content may be reduced to several parts per million alongside with an increase in the content of alkenes in the product gas flow. Some palladium based catalysts for the selective hydrogenation of acetylene hydrocarbons are considered in [4][5][6][7]. In the study [4], the effect of Pd acetyl acetonate and acetate based precursor salts on the catalytic activity and selectivity of palladium Pd/δ-Al 2 O 3 catalysts in the methylacetylene and propanediene hydrogenation reaction in the pyrogas propane-propylene fraction was demonstrated, and the optimal catalyst regeneration temperature was established.…”

Section: Introductionmentioning

confidence: 99%

Studying the Selective Methylacetylene Hydrogenation Reaction in Methylacetylene–Propylene Mixtures on Palladium Oxide Nanocatalysts

Писаренко

Ponomaryov

Pisarenko³

2021

Theor Found Chem Eng

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The mechanism and kinetics of the selective catalytic methylacetylene hydrogenation reaction in propane-propylene gas mixtures were studied until the complete consumption of methylacetylene in them on the Pd nanocatalyst (Pd/α-Al 2 O 3 ) promoted by metals from Groups I, II, and VI of Mendeleev's Periodic Table at a Pd content of 0.05 wt %. The experiments were performed in an isothermic plug flow reactor of 100 cm 3 in volume and a bench polytropic reactor of 8 dm 3 in volume. The experiments were carried out by varying the feedstock hourly space velocity from 2000 to 3000 h -1 , the reaction mixture temperature from 303 to 420 K, and the molar hydrogen/methylacetylene ratio from 1.5 to 3.0. Overall, 40 experiments in the isothermic flow-type reactor and 30 experiments in the bench polytropic reactor were carried out. Based on the results of laboratory experiments, a stagewise mechanism was proposed for this catalytic reaction, and the kinetic model corresponding to this mechanism was constructed. The model constants were estimated by the least-squares technique. For the studied reaction, the selective region where there was no methylacetylene, and the propylene concentration in the outlet flow was higher than in the initial flow of reagents, was determined.

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“…The principles of green chemistry [1] are targeting to develop energy-saving selective processes for the production of valuable chemicals. Many monomers and plasticizers, aromatic substances, vitamins, pheromones, medicines and other biologically active substances are synthesized catalytically based on a selective hydrogenation of long-chain (C 10 -C 20 ) acetylene compounds into olefin derivatives [2][3][4][5][6][7][8][9]. These reactions are often carried out at high temperatures and pressures with rather low yields of targeted products.…”

Section: Introductionmentioning

confidence: 99%

“…Polymers with different functional groups are used as one of the nanotechnology approach to synthesize metal nanoparticles and catalysts [10][11][12][13][14][15] We have developed a simple method of catalyst preparation based on interaction and stabilization of metal nanoparticles by polymers on the surface of inorganic sorbents (natural and synthetic zeolites, metal oxides) [16,17]. The developed technique allows to obtain catalysts for selective hydrogenation of wide range of unsaturated compounds [16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Polysaccharide-Stabilized Palladium Nanocatalyst for Semi-Hydrogenation of Complex Alkynols

Жармагамбетова¹,

Zhurinov²

2019

OF THE NATIONAL ACADEMY OF SCIENCES OF THE REPUBLIC OF KAZAKHST

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Polymer-modified supported palladium catalysts for the hydrogenation of acetylene compounds

Cited by 17 publications

References 13 publications

Behavior of Pd‐supported catalysts in phenylacetylene hydrogenation: Effect of combined use of polyvinylpyrrolidone and NaOH for magnetic support modification

Behavior of Pd‐supported catalysts in phenylacetylene hydrogenation: Effect of combined use of polyvinylpyrrolidone and NaOH for magnetic support modification

Studying the Selective Methylacetylene Hydrogenation Reaction in Methylacetylene–Propylene Mixtures on Palladium Oxide Nanocatalysts

Polysaccharide-Stabilized Palladium Nanocatalyst for Semi-Hydrogenation of Complex Alkynols

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