Ammonia synthesis over a Ba and Ce-promoted carbon-supported cobalt catalyst. Effect of the cerium addition and preparation procedure

Karolewska, M.; Truszkiewicz, Elżbieta; Wściseł, Maria; Mierzwa, Bogusław; Kępiński, Leszek; Raróg‐Pilecka, Wioletta

doi:10.1016/j.jcat.2013.03.005

Cited by 30 publications

(26 citation statements)

References 18 publications

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“…In 2013 Karolewska et al further studied the effect of cerium addition and the preparation procedure on cobalt catalysts supported on carbon. [ 128 ] Their carbon support was obtained from treated commercial activated carbon; the cobalt and cerium were then supported on the carbon following two different procedures. [ 128 ] The first involved separate impregnation steps for both the cobalt nitrate and cerium nitrate precursors using an alcoholic solution.…”

Section: Cobalt‐based Catalystsmentioning

confidence: 99%

“…Again barium nitrate was added as a promoter using the standard impregnation method. [ 128 ] Catalytic activity measurements were conducted at 9.0 MPa at a temperature of 400 °C using a stoichiometric gas flow of nitrogen and hydrogen. At these conditions it was found that a higher rate can be achieved when the catalyst is prepared through the coimpregnation method, with a rate of 8.16 g NH3 g −1 h −1 for the coimpregnated catalyst and 4.95 g NH3 g −1 h −1 for the stepwise‐impregnated catalyst.…”

Section: Cobalt‐based Catalystsmentioning

confidence: 99%

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Development and Recent Progress on Ammonia Synthesis Catalysts for Haber–Bosch Process

Humphreys

Lan

Tao

2020

Adv Energy and Sustain Res

301

148

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Due to its essential use as a fertilizer, ammonia synthesis from nitrogen and hydrogen is considered to be one of the most important chemical processes of the last 100 years. Since then, an enormous amount of work has been undertaken to investigate and develop effective catalysts for this process. Although the catalytic synthesis of ammonia has been extensively studied in the last century, many new catalysts are still currently being developed to reduce the operating temperature and pressure of the process and to improve the conversion of reactants to ammonia. New catalysts for the Haber–Bosch process are the key to achieving green ammonia production in the foreseeable future. Herein, the history of ammonia synthesis catalyst development is briefly described as well as recent progress in catalyst development with the aim of building an overview of the current state of ammonia synthesis catalysts for the Haber–Bosch process. The new emerging ammonia synthesis catalysts, including electride, hydride, amide, perovskite oxide hydride/oxynitride hydride, nitride, and oxide promoted metals such as Fe, Co, and Ni, are promising alternatives to the conventional fused‐Fe and promoted‐Ru catalysts for existing ammonia synthesis plants and future distributed green ammonia synthesis based on the Haber–Bosch process.

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Section: Cobalt‐based Catalystsmentioning

confidence: 99%

Section: Cobalt‐based Catalystsmentioning

confidence: 99%

Development and Recent Progress on Ammonia Synthesis Catalysts for Haber–Bosch Process

Humphreys

Lan

Tao

2020

Adv Energy and Sustain Res

301

148

View full text Add to dashboard Cite

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“…Unsupported cobalt catalysts showed good activity for ammonia synthesis [113,114], improving thermal stability when cerium or barium were incorporated as promoters.…”

Section: Cobalt-based Catalystsmentioning

confidence: 99%

Synthesis of Supported Mesoporous Catalysts Using Supercritical CO₂

Aspromonte¹,

Piovano²,

Alonso³

et al. 2020

Advances in Microporous and Mesoporous Materials

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Metal and metal oxide nanoparticles have attracted increased attention due to their unusual physical and chemical properties. The nature, dispersion, and size of the nanoparticles are key factors in determining the activity and selectivity of the supported catalysts. Supercritical fluid deposition (SCFD) is a promising method to deposit metallic nanoparticles and films on inorganic porous supports. CO 2 is the most commonly used supercritical fluid (sc-CO 2) for material synthesis because it is nontoxic, nonreactive, nonflammable, and inexpensive. This work presents the synthesis of cobalt, nickel, and ruthenium nanoparticles on MCM-41, Al-MCM-41, MCM-48, and activated carbon supports in sc-CO 2. Batch and continuous deposition are studied, with two high-pressure reactor configurations: column or alternative (sandwich). To avoid the length of the bed being too long, the reagents were separated into smaller amounts and placed alternately, keeping the total mass of the precursor and support constant. The prepared samples were characterized by scanning electron (SEM/EDX) and transmission electron microscopy (TEM).

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“…The unique characteristics of large surface area and strong pore systems of activated carbon (AC) have been proven to be favorable for thermal catalytic NH 3 synthesis. [17][18][19] An early patent also showed that carbon-supported catalysts had a higher activity compared to catalysts with other supports. [20] However, the use of AC-based catalysts in the plasma-catalytic NH 3 synthesis is still limited.…”

Section: Introductionmentioning

confidence: 99%

Plasma‐enhanced NH₃ synthesis over activated carbon‐based catalysts: Effect of active metal phase

Zhu

et al. 2020

Plasma Processes & Polymers

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In this study, plasma-enhanced NH 3 synthesis over a series of M/AC (M = Ru, Co, Ni, and Fe) catalysts was investigated. The combination of the plasma and activated carbon (AC) enhanced the reaction performance compared with the reaction using plasma alone. The doping of active metal on AC further improved the reaction performance by up to 37.3%. The highest NH 3 concentration of 3,026.5 ppm was obtained over Ru/AC at a specific input energy (SIE) of 12.5 kJ/ L, followed by Co/AC, Fe/AC, and Ni/AC. The highest energy efficiency of 0.72 g/ kWh was achieved at an SIE of 8.0 kJ/L when using the Ru/AC catalyst. Catalyst characterizations showed that the basicity of the M/AC catalysts plays an important role in the plasma-enhanced catalytic synthesis of NH 3. The reaction mechanism in the plasma-enh anced NH 3 synthesis was also discussed.

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Ammonia synthesis over a Ba and Ce-promoted carbon-supported cobalt catalyst. Effect of the cerium addition and preparation procedure

Cited by 30 publications

References 18 publications

Development and Recent Progress on Ammonia Synthesis Catalysts for Haber–Bosch Process

Development and Recent Progress on Ammonia Synthesis Catalysts for Haber–Bosch Process

Synthesis of Supported Mesoporous Catalysts Using Supercritical CO₂

Plasma‐enhanced NH₃ synthesis over activated carbon‐based catalysts: Effect of active metal phase

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Ammonia synthesis over a Ba and Ce-promoted carbon-supported cobalt catalyst. Effect of the cerium addition and preparation procedure

Cited by 30 publications

References 18 publications

Development and Recent Progress on Ammonia Synthesis Catalysts for Haber–Bosch Process

Development and Recent Progress on Ammonia Synthesis Catalysts for Haber–Bosch Process

Synthesis of Supported Mesoporous Catalysts Using Supercritical CO2

Plasma‐enhanced NH3 synthesis over activated carbon‐based catalysts: Effect of active metal phase

Contact Info

Product

Resources

About

Synthesis of Supported Mesoporous Catalysts Using Supercritical CO₂

Plasma‐enhanced NH₃ synthesis over activated carbon‐based catalysts: Effect of active metal phase