Highly Active, Selective and Stable Reverse Water Gas Shift Catalyst Based on High Surface Area MoC/γ-Al2O3 Synthesized by Reverse Microemulsion

Sun, Guanjie; Mottaghi-Tabar, Sogol; Ricardez‐Sandoval, Luis A.; Simakov, David S. A.

doi:10.1007/s11244-020-01411-y

Cited by 13 publications

(13 citation statements)

References 22 publications

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“…The highest conversion reported in Table is for the Cu/β-Mo 2 C catalyst (35%) . However, in this study, Cu was applied as a promoter, while the Mo 2 C phase itself is highly active in RWGS and Al 2 O 3 -supported Mo 2 C can provide near-to-equilibrium CO 2 conversions above 500 °C, for example, 50% at 550 °C …”

Section: Introductionmentioning

confidence: 76%

“…11 However, in this study, Cu was applied as a promoter, while the Mo 2 C phase itself is highly active in RWGS and Al 2 O 3 -supported Mo 2 C can provide near-to-equilibrium CO 2 conversions above 500 °C, for example, 50% at 550 °C. 35 Among the synthesis techniques reported in the literature, the reverse microemulsion (RME) method is known to be particularly useful for the synthesis of materials with a high SSA. 36,37 In the RME synthesis, the reaction volume is limited to nanometric water droplets dispersed in a continuous oil phase, leading to nanometric particle size with a narrow size distribution.…”

Section: Introductionmentioning

confidence: 99%

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Reverse Microemulsion-Synthesized High-Surface-Area Cu/γ-Al₂O₃ Catalyst for CO₂ Conversion via Reverse Water Gas Shift

Zakharova

Iqbal

Madadian

et al. 2022

ACS Appl. Mater. Interfaces

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Reverse microemulsion method was implemented to synthesize a CuO/γ-Al2O3 catalyst (18 wt % Cu) with a specific surface area (SSA) of 328 m2/g (after calcination at 400 °C). Catalytic performance was evaluated in the range of temperatures and space velocities (300–600 °C and 10,000–200,000 mL/(g h)). The catalyst was 100% selective to CO generation while attaining a nearly equilibrium CO2 conversion at 500 °C (ca. 50% at 10,000 mL/(g h) and H2/CO2 = 4). Despite the initial reduction of surface area under the reaction conditions, the reduced Cu/γ-Al2O3 catalyst demonstrated a stable performance for 80 h on stream, attaining a nearly equilibrium CO2 conversion at 600 °C (ca. 60% at 60,000 mL/(g h) and H2/CO2 = 4). The selectivity to CO generation remained complete during the stability test, and no significant carbon deposition was detected.

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Section: Introductionmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Reverse Microemulsion-Synthesized High-Surface-Area Cu/γ-Al₂O₃ Catalyst for CO₂ Conversion via Reverse Water Gas Shift

Zakharova

Iqbal

Madadian

et al. 2022

ACS Appl. Mater. Interfaces

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“…54,90 This method has proven notable advantages, such as the ability to produce sized-controlled small particles (5−50 nm) with a narrow particle size distribution, the possibility of recovering bimetallic nanoparticles at room temperature, and more importantly, high surface area support and well-dispersed active phase systems. 54,91,92 As a result, microemulsion techniques have also been used to synthesize inverse catalysts. Recently, Wang et al 93 synthesized a series of ZnO/Cu inverse catalysts using a microemulsion method by varying the Zn/Cu molar ratio in the precursor solution.…”

Section: Encapsulation Methodsmentioning

confidence: 99%

“…In contrast, the microemulsion technique is a synthesis method that consists of a thermodynamically stable dispersion of two immiscible solutions, one containing the metal precursor(s) and the other containing a precipitating agent. A similar approach may also involve the addition of a precipitating agent directly to an emulsion containing the metal precursor. , This method has proven notable advantages, such as the ability to produce sized-controlled small particles (5–50 nm) with a narrow particle size distribution, the possibility of recovering bimetallic nanoparticles at room temperature, and more importantly, high surface area support and well-dispersed active phase systems. ,, As a result, microemulsion techniques have also been used to synthesize inverse catalysts. Recently, Wang et al synthesized a series of ZnO/Cu inverse catalysts using a microemulsion method by varying the Zn/Cu molar ratio in the precursor solution.…”

Section: Methods For the Synthesis Of Inverse Catalystsmentioning

confidence: 99%

Inverse Oxide/Metal Catalysts for CO₂ Hydrogenation to Methanol

et al. 2022

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The hydrogenation of CO 2 to methanol using heterogeneous catalysts is an appealing route for mitigating greenhouse gas emissions and generating useful products. The synthesis of methanol is attractive due to its utilization as a fuel, a fuel additive, or an intermediate for a wide array of industrial chemicals. Traditional catalytic systems, like those based on Cu or Ni, have been extensively explored but have thus far shown limited conversion and selectivity to desired products like methanol primarily due to the chemical stability of CO 2 . These catalysts are also difficult to use industrially due to the high pressures and temperatures needed for these catalytic reactions. In the search for improvements in the reaction rates, conversion, and selectivity to liquid products, inverse oxide/metal catalysts have been recently explored and have yielded promising results. This review summarizes the latest advances in the use of inverse catalysts for the hydrogenation of CO 2 to methanol. First, this review focuses on some strategies for synthesizing inverse oxide/metal catalysts. Next, the relationship between the interfacial properties and the catalytic activity is reviewed, emphasizing the nature of the oxide layer and its dispersion on the metal surface. Lastly, the activities of inverse catalysts and materials prepared by traditional synthesis approaches are compared.

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“…Chemical utilization of CO 2 has received extensive attentions. , Among them, CO 2 hydrogenation reactions such as the reverse WGS (RWGS) reaction have been extensively studied, which can be catalyzed by transition metal oxide (TMO x ), TMC x , and TMN x catalysts. − Moreover, the CO 2 hydrogenation reaction is a typical case of the redox reaction containing both oxidant (CO 2 ) and reductant (H 2 ) components. The surface active structure of TMN x and TMC x catalysts in the CO 2 hydrogenation reaction remains controversial.…”

Section: Introductionmentioning

confidence: 99%

Hydrogenated Molybdenum Oxide Overlayers Formed on Mo Nitride Nanosheets in Ambient-Pressure CO₂/H₂ Gases

Zhao

Wang

Hui

et al. 2022

ACS Appl. Mater. Interfaces

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Transition metal nitrides (TMN x ) often exhibit high catalytic activity in many important reactions. Due to their low stability in a reaction environment, it remains as a crucial issue to reveal surface active structures in catalytic reactions, particularly for the cases containing both oxidative and reductive gases. Herein, MoN and Mo2N nanosheets have been constructed on Al2O3(0001) and Au foil surfaces, and in situ surface characterizations are performed on the model catalysts in ambient-pressure CO2, H2, and CO2 + H2 gases. In situ Raman spectroscopy and quasi in situ X-ray photoelectron spectroscopy (XPS) analysis indicate that MoO3 and defective MoO3–x overlayers form on both MoN and Mo2N surfaces in CO2, and the surface oxidation occurs under a milder condition on Mo2N than on MoN. Further, a hydrogenated Mo oxide (H z MoO3–y ) overlayer forms in a CO2 + H2 atmosphere, as confirmed using quasi in situ XPS and time-of-flight secondary ion mass spectroscopy. The surface analysis over the model nitride catalysts suggests that O and/or H atoms may be incorporated into surface layers to form the active structure in many O and H-containing reactions.

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Highly Active, Selective and Stable Reverse Water Gas Shift Catalyst Based on High Surface Area MoC/γ-Al2O3 Synthesized by Reverse Microemulsion

Cited by 13 publications

References 22 publications

Reverse Microemulsion-Synthesized High-Surface-Area Cu/γ-Al₂O₃ Catalyst for CO₂ Conversion via Reverse Water Gas Shift

Reverse Microemulsion-Synthesized High-Surface-Area Cu/γ-Al₂O₃ Catalyst for CO₂ Conversion via Reverse Water Gas Shift

Inverse Oxide/Metal Catalysts for CO₂ Hydrogenation to Methanol

Hydrogenated Molybdenum Oxide Overlayers Formed on Mo Nitride Nanosheets in Ambient-Pressure CO₂/H₂ Gases

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Highly Active, Selective and Stable Reverse Water Gas Shift Catalyst Based on High Surface Area MoC/γ-Al2O3 Synthesized by Reverse Microemulsion

Cited by 13 publications

References 22 publications

Reverse Microemulsion-Synthesized High-Surface-Area Cu/γ-Al2O3 Catalyst for CO2 Conversion via Reverse Water Gas Shift

Reverse Microemulsion-Synthesized High-Surface-Area Cu/γ-Al2O3 Catalyst for CO2 Conversion via Reverse Water Gas Shift

Inverse Oxide/Metal Catalysts for CO2 Hydrogenation to Methanol

Hydrogenated Molybdenum Oxide Overlayers Formed on Mo Nitride Nanosheets in Ambient-Pressure CO2/H2 Gases

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Reverse Microemulsion-Synthesized High-Surface-Area Cu/γ-Al₂O₃ Catalyst for CO₂ Conversion via Reverse Water Gas Shift

Reverse Microemulsion-Synthesized High-Surface-Area Cu/γ-Al₂O₃ Catalyst for CO₂ Conversion via Reverse Water Gas Shift

Inverse Oxide/Metal Catalysts for CO₂ Hydrogenation to Methanol

Hydrogenated Molybdenum Oxide Overlayers Formed on Mo Nitride Nanosheets in Ambient-Pressure CO₂/H₂ Gases