The influence of Pd loading on the physicochemical properties of the Cu–Cr–Al methanol synthesis catalysts

Mierczyński, Paweł; Kaczorowski, P.; Maniecki, Tomasz P.; Bawolak, K.; Maniukiewicz, Waldemar

doi:10.1007/s11144-013-0550-9

Cited by 9 publications

(6 citation statements)

References 25 publications

(25 reference statements)

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“…6). This single reduction stage was situated in the temperature range 300-580°C, which is connected with the reduction of Cr(VI) oxidized phase formed from the previously re-oxidized phase of Cr 2 O 3 [22][23][24][25][26]. The obtained results also clearly indicate that the highest hydrogen consumption peak was observed for Al 2 O 3 -Cr 2 O 3 (2:1) system.…”

Section: Resultsmentioning

confidence: 58%

Fischer–Tropsch synthesis over various Fe/Al2O3–Cr2O3 catalysts

Mierczyński

Dawid

Maniukiewicz

et al. 2018

Reac Kinet Mech Cat

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Monometallic iron supported catalysts were prepared by the impregnation method and tested in Fischer-Tropsch (F-T) synthesis. The activity tests performed in the studied reaction showed that the composition of the catalyst strongly influences the reactivity of the catalytic systems in the F-T reaction. It was also found that the system which showed the highest content of iron species on the catalyst surface exhibited the highest yield in F-T reaction. In addition, the most active catalyst also showed high specific surface area, high total acidity value and the highest amount of iron species on the catalyst surface. The analysis of the liquid product of F-T synthesis confirmed the occurrence of aliphatic, branched and unsaturated linear hydrocarbons.

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Section: Resultsmentioning

confidence: 58%

Fischer–Tropsch synthesis over various Fe/Al2O3–Cr2O3 catalysts

Mierczyński

Dawid

Maniukiewicz

et al. 2018

Reac Kinet Mech Cat

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“…More hydrogen (H) is also required to consume CO in Cu + −CO bonds to form methanol and release Cu + . Palladium (Pd)‐doped Cu–Cr–Al catalysts have shown improved yields during methanol synthesis because of H spillover from Pd to the oxide (xCuO:yCr 2 O 3 :zAl) …”

Section: Introductionmentioning

confidence: 99%

“…Palladium (Pd)-doped Cu-Cr-Al catalysts have shown improved yields during methanol synthesis because of H spillover from Pd to the oxide (xCuO:yCr 2 O 3 :zAl). [12] Elements such as Pt, Pd, Ru, Rh, and Ni tend to generate Hspillover, [13] which has been proposed to be useful in catalytic reactions, such as methanol synthesis, [14] H enrichment, [15] hydroisomerization, hydrogenation of olefins, aromatics, [16] and environmental catalysis. [17] This work is performed to investigate the influences of Pd content on the Cu 0 /Cu + ratio, reducing property, surface con-tents, catalytic activity, and stability of CuÀPd/SiO 2 catalysts for gas-phase hydrogenation of DMO.…”

Section: Introductionmentioning

confidence: 99%

Effect of Pd Doping on the Cu⁰/Cu⁺Ratio of Cu-Pd/SiO₂Catalysts for Ethylene Glycol Synthesis from Dimethyl Oxalate

Zhang

Wang

et al. 2016

ChemistrySelect

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The Cu0/Cu+ ratio is very important in many copper‐catalyzed reactions. A series of Cu−Pd/SiO2 catalysts were prepared by composite evaporation of ammonia with subsequent Pd impregnation. The Cu0/Cu+ ratio could be controlled by changing the Pd content in the catalysts during reduction. The catalysts were applied to the hydrogenation of dimethyl oxalate, and experimental results showed that a suitable amount of Pd doping remarkably improved the activity and prolonged the lifetime of the catalyst. The optimized Cu‐0.5 % Pd/SiO2 catalyst showed complete conversion with 96.0 % ethylene glycol selectivity over a lifetime of 300 h. Enhancements in the activity and stability of the Cu−Pd/SiO2 catalysts were ascribed to the stable generation of hydrogen spillover, which tended to adjust the Cu0/Cu+ ratio with changes in Pd content in the reduced catalysts. Hydrogen spillover also promoted the release of intermediates in contact with Cu+ to inhibit copper sintering.

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“…The H 2 spillover ability of Pd in Cu‐based catalysts enhances the methanol generation activity 5 . The activity of Pd‐doped Cu‐based catalyst is more favorable at higher temperatures; i.e., at 290 °C, the STY is four times greater than that at 260 °C 94 . The product activities are still low because Pd can hardly dissociate CO 95 .…”

Section: Copper‐based Catalyst System and Effect Of Various Promoters...mentioning

confidence: 99%

Significance and influence of various promoters on Cu‐based catalyst for synthesizing methanol from syngas: a critical review

Saw

Datta

Chavan

et al. 2023

J of Chemical Tech & Biotech

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Methanol synthesis from syngas is an effective method for producing fuel additives, oxygenated fuels, and other chemicals. Several promoted catalytic systems have been tested for the synthesis of methanol. Catalysts based on noble metals are extremely active in generating methanol from syngas. However, sintering, poisoning, and related expenses accounted for the switch to Cu-based catalysts. The promotion of Cu-based catalysts, even with small doses of an effective promoter, resulted in a considerable change in product selectivity. A suitable promoter is required for Cu-based catalysts used in the synthesis of methanol because it significantly impacts the electronic, geometric, or acid/base surface properties, which in turn affect the catalyst's activity and selectivity. It also significantly impacts the interactions between the catalyst's active ingredients. However, the interactions between the active component and the promoter can be adjusted or influenced by appropriate support. The present paper primarily focuses on several promoters in the copper-based catalyst for synthesizing methanol from syngas. We briefly deliberated on the need for copper-based catalysts for methanol synthesis, their reaction and mechanism, the reasons for promoter addition concerning their role and influence, the importance of CO 2 addition in feed synthesis gas and their impact on the catalyst. This paper mainly highlights the selectivity and activity of various promoted Cu-based catalysts, although different reaction parameters are the cause of promotion and inhibition in the catalyst. The effects of reaction conditions, including pressure, temperature, gas hourly space velocity (GHSV), and syngas composition, are briefly reported. This paper also comprehensively compares the effects of adding various promoters in small amounts to copper-based catalysts. This review intends to be illustrative rather than exhaustive.

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The influence of Pd loading on the physicochemical properties of the Cu–Cr–Al methanol synthesis catalysts

Cited by 9 publications

References 25 publications

Fischer–Tropsch synthesis over various Fe/Al2O3–Cr2O3 catalysts

Fischer–Tropsch synthesis over various Fe/Al2O3–Cr2O3 catalysts

Effect of Pd Doping on the Cu⁰/Cu⁺Ratio of Cu-Pd/SiO₂Catalysts for Ethylene Glycol Synthesis from Dimethyl Oxalate

Significance and influence of various promoters on Cu‐based catalyst for synthesizing methanol from syngas: a critical review

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The influence of Pd loading on the physicochemical properties of the Cu–Cr–Al methanol synthesis catalysts

Cited by 9 publications

References 25 publications

Fischer–Tropsch synthesis over various Fe/Al2O3–Cr2O3 catalysts

Fischer–Tropsch synthesis over various Fe/Al2O3–Cr2O3 catalysts

Effect of Pd Doping on the Cu0/Cu+Ratio of Cu-Pd/SiO2Catalysts for Ethylene Glycol Synthesis from Dimethyl Oxalate

Significance and influence of various promoters on Cu‐based catalyst for synthesizing methanol from syngas: a critical review

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Effect of Pd Doping on the Cu⁰/Cu⁺Ratio of Cu-Pd/SiO₂Catalysts for Ethylene Glycol Synthesis from Dimethyl Oxalate