Highly stable platinum monolith catalyst for the hydrogenation of vegetable oil

Troncoso, Franco David; Tonetto, Gabriela Marta

doi:10.1016/j.cep.2021.108669

Cited by 16 publications

(13 citation statements)

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“…The selectivity of the partial hydrogenation of vegetable oil can also be modified by changed the arrangement of the catalyst in the reactor. It is interesting to compare Pt/γ‐Al 2 O 3 (Cl I ) catalyst with a monolithic Pt/alumina catalyst prepared with the same metal precursor over an anodized aluminum monolith (Al 2 O 3 /Al) (Troncoso & Tonetto, 2022). This structured catalyst presented a Pt particle size of 1.6 nm (determined from H 2 chemisorption), and it will be referred as Pt/Al 2 O 3 /Al in this work.…”

Section: Resultsmentioning

confidence: 99%

Hydrogenation of vegetable oil using highly dispersed Pt/γ‐Al₂O₃ catalyst: Effects of key operating parameters and deactivation study

Troncoso

Costilla

Tonetto

2022

J Americ Oil Chem Soc

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In the present work, Pt/γ-Al 2 O 3 catalysts with high metal dispersion were prepared and characterized using chloroplatinic acid and platinum acetylacetonate as metal precursors. The activity and selectivity of the catalysts were evaluated in the hydrogenation of sunflower oil. A comprehensive analysis of the effects of key operational parameters on catalytic performance was carried out. The experimental variables were hydrogen pressure (275.8-551.6 kPa), temperature (160-200 C), and catalyst loading (0.005-0.015 kg Pt exp /m 3 oil ). Platinum catalysts were active, with a double bond conversion of 28% at 2 h. The metal precursor affected catalyst selectivity. The catalyst prepared with chloroplatinic acid exhibited a lower formation of trans-isomers compared with Pt acetylacetonate. The γ-Al 2 O 3 supported platinum catalyst with a metal loading of 0.51 wt.% and a metal dispersion of 98% maintained its initial catalyst activity and selectivity after 10 consecutive uses (1200 min accumulate operation time), without changes in its catalytic properties. The obtained results suggested that Pt catalysts are an attractive alternative to conventional nickel catalysts for the hydrogenation of vegetable oil.

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Section: Resultsmentioning

confidence: 99%

Hydrogenation of vegetable oil using highly dispersed Pt/γ‐Al₂O₃ catalyst: Effects of key operating parameters and deactivation study

Troncoso

Costilla

Tonetto

2022

J Americ Oil Chem Soc

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“…Two catalysts were used in this work, namely, a monolithic catalyst, referred to as Pt/Al 2 O 3 /Al, and a powder catalyst, Pt/ γ ‐Al 2 O 3 . The synthesis and characterization of both catalysts were previously reported 12, 15.…”

Section: Methodsmentioning

confidence: 99%

“…The deactivation phenomenon was imperceptible taking into account the high stability showed by Pt/Al 2 O 3 /Al and Pt/ γ ‐Al 2 O 3 catalysts. Even the selectivity of Pt catalyst remains unaltered after consecutive tests 12. The model was based on the following hypothesis 16: The TG and H 2 molecules do not compete for the same active sites.…”

Section: Methodsmentioning

confidence: 99%

Vegetable Oil Hydrogenation over Pt Monolithic and Powder Catalysts: Experimental and Modeling Study

2022

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A complete kinetic study was performed for the hydrogenation of vegetable oil using a powder and a monolithic Pt catalyst. The experimental studies were carried out at a wide interval of H2 pressure, temperature, and catalyst loading using Pt/γ‐Al2O3 powder catalyst in a slurry reactor and Pt/Al2O3/Al‐structured catalyst in a monolithic stirrer reactor. The mathematical model for the reactors includes the hydrogenation and isomerization reactions, the external gas‐liquid and liquid‐solid mass transfer as well as the internal mass transfer. Four kinetic models were evaluated for both catalysts. The best fit of the experimental data was obtained by adopting a Langmuir‐Hinshelwood kinetic model for the liquid reactant and a dissociative adsorption and zero‐order reaction for H2.

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“…As mentioned in the previous paragraph, both Pd-and Ni-based catalysts were prepared by co-polymerizing the metal containing monomers M(AAEMA)2 (AAEMA − = deprotonated form of 2-(acetoacetoxy)ethyl methacrylate; M = Pd, Ni) with suitable comonomers (ethyl methacrylate (EMA) for Pd and N,N-dimethylacrilamide (DMA) for Ni) and cross-linkers (ethylene glycol dimethacrylate (EGDMA) for Pd and N,N'-methylene bis-acrylamide (MBAA) for Ni; Scheme 2), thus obtaining porous amphiphilic resins supporting homogeneously dispersed M(II) centers (Pd(II)-pol and Ni(II)-pol) [30]. In recent years, many studies on upgrading FAMEs have been reported [11,12], most of them being catalytic hydrogenation [13,14] or transfer hydrogenation systems [15,16], based on metals such as Ni [17][18][19], Pd [20][21][22], Pt [23], or Ir [24]. However, it should be underlined that WCO feedstocks contain several unwanted species, such as free fatty acids (FFAs) and water (not present in fresh vegetable oils), posing serious concerns for the stability of the catalytic systems used for upgrading biofuels [3].…”

Section: Catalystsmentioning

confidence: 99%

Partial Hydrogenation of Soybean and Waste Cooking Oil Biodiesel over Recyclable-Polymer-Supported Pd and Ni Nanoparticles

et al. 2022

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Biodiesel obtained through the transesterification in methanol of vegetable oils, such as soybean oil (SO) and waste cooking oil (WCO), cannot be used as a biofuel for automotive applications due to the presence of polyunsaturated fatty esters, which have a detrimental effect on oxidation stability (OS). A method of upgrading this material is the catalytic partial hydrogenation of the fatty acid methyl ester (FAME) mixture. The target molecule of the partial hydrogenation reaction is monounsaturated methyl oleate (C18:1), which represents a good compromise between OS and the cold filter plugging point (CFPP) value, which becomes too high if the biodiesel consists of unsaturated fatty esters only. In the present work, polymer-supported palladium (Pd-pol) and nickel (Ni-pol) nanoparticles were separately tested as catalysts for upgrading SO and WCO biodiesels under mild conditions (room temperature for Pd-pol and T = 100 °C for Ni-pol) using dihydrogen (p = 10 bar) as the reductant. Both catalysts were obtained through co-polymerization of the metal containing monomer M(AAEMA)2 (M = Pd, Ni; AEEMA− = deprotonated form of 2-(acetoacetoxy)ethyl methacrylate)) with co-monomers (ethyl methacrylate for Pd and N,N-dimethylacrilamide for Ni) and cross-linkers (ethylene glycol dimethacrylate for Pd and N,N’-methylene bis-acrylamide for Ni), followed by reduction. The Pd-pol system became very active in the hydrogenation of C=C double bonds, but poorly selective towards the desirable C18:1 product. The Ni-pol catalyst was less active than Pd-pol, but very selective towards the mono-unsaturated product. Recyclability tests demonstrated that the Ni-based system retained its activity and selectivity with both the SO and WCO substrates for at least five subsequent runs, thus representing an opportunity for waste biomass valorization.

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Highly stable platinum monolith catalyst for the hydrogenation of vegetable oil

Cited by 16 publications

References 50 publications

Hydrogenation of vegetable oil using highly dispersed Pt/γ‐Al₂O₃ catalyst: Effects of key operating parameters and deactivation study

Hydrogenation of vegetable oil using highly dispersed Pt/γ‐Al₂O₃ catalyst: Effects of key operating parameters and deactivation study

Vegetable Oil Hydrogenation over Pt Monolithic and Powder Catalysts: Experimental and Modeling Study

Partial Hydrogenation of Soybean and Waste Cooking Oil Biodiesel over Recyclable-Polymer-Supported Pd and Ni Nanoparticles

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Highly stable platinum monolith catalyst for the hydrogenation of vegetable oil

Cited by 16 publications

References 50 publications

Hydrogenation of vegetable oil using highly dispersed Pt/γ‐Al2O3 catalyst: Effects of key operating parameters and deactivation study

Hydrogenation of vegetable oil using highly dispersed Pt/γ‐Al2O3 catalyst: Effects of key operating parameters and deactivation study

Vegetable Oil Hydrogenation over Pt Monolithic and Powder Catalysts: Experimental and Modeling Study

Partial Hydrogenation of Soybean and Waste Cooking Oil Biodiesel over Recyclable-Polymer-Supported Pd and Ni Nanoparticles

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Hydrogenation of vegetable oil using highly dispersed Pt/γ‐Al₂O₃ catalyst: Effects of key operating parameters and deactivation study

Hydrogenation of vegetable oil using highly dispersed Pt/γ‐Al₂O₃ catalyst: Effects of key operating parameters and deactivation study