NGU: Development of a two‐bed circulating fluidized bed reactor system for nonoxidative aromatization of methane over Mo/HZSM‐5 catalyst

Zhang, Zhanguo; Xu, Yuebing; Song, Yang; Ma, Hongtao; Yamamoto, Yo

doi:10.1002/ep.12287

Cited by 16 publications

(2 citation statements)

References 29 publications

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“…P2G relies on water electrolysis (for sustainable H 2 production) and CO 2 hydrogenation (the so‐called catalytic CO 2 methanation for producing methane, CH 4 , Equation ). Therefore, P2G enables the sustainable production of economical viable H 2 to hydrogenate CO 2 into CH 4 which can be either directly injected into the existing gas grid or used as a feedstock for the production of other value‐added chemicals (e.g., via methane aromatization into aromatics) 9,10

{CO}_{2} + 4 H_{2} \to {CH}_{4} + 2 H_{2} normalO, Δ_{r} H_{298 normalK}^{0} = - 165 kJ {mol}^{- 1} .

…”

Section: Introductionmentioning

confidence: 99%

Structured Ni@NaA zeolite supported on silicon carbide foam catalysts for catalytic carbon dioxide methanation

Zhang

Chen

et al. 2020

AIChE Journal

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Carbon dioxide (CO 2) conversion is an important yet challenging topic, which helps to address climate change challenge. Catalytic CO 2 methanation is one of the methods to convert CO 2 , however, it is limited by kinetics. This work developed a structured Ni@NaA zeolite supported on silicon carbide (SiC) foam catalyst (i.e., Ni@NaA-SiC), which demonstrated an excellent performance with a CO 2 conversion of 82%, being comparable to the corresponding equilibrium conversion, and CH 4 selectivity of 95% at 400 C. The activation energy for CO 2 conversion over the 15Ni@NaA-SiC catalyst is about 31 kJ mol −1 , being significantly lower than that of the 15Ni@NaA pelletized catalyst (i.e., 84 kJ mol −1). Additionally, the structured catalyst was highly stable with sustained CO 2 conversion at 78.7 ± 1.4% and selectivity to CH 4 at 97.7 ± 0.2% over an 80 hr longevity test. In situ diffuse reflectance infrared Fourier transform spectroscopy-mass spectroscopy characterization revealed that catalysis over the structured catalyst proceeded primarily via the CO free mechanism.

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{CO}_{2} + 4 H_{2} \to {CH}_{4} + 2 H_{2} normalO, Δ_{r} H_{298 normalK}^{0} = - 165 kJ {mol}^{- 1} .

…”

Section: Introductionmentioning

confidence: 99%

Structured Ni@NaA zeolite supported on silicon carbide foam catalysts for catalytic carbon dioxide methanation

Zhang

Chen

et al. 2020

AIChE Journal

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“…Using smaller catalyst particles can reduce transport limitations but may also lead to higher pressure drops within the packed bed. Recent advances in the reactor technologies show that fluidized-bed reactors offer potential benefits in improving catalyst effectiveness and controlling pressure drop. − Thus, using small particles in a fluidized bed reactor could reduce mass-transport limitations and catalyst fouling but at the expense of increasing reactor complexity.…”

Section: Resultsmentioning

confidence: 99%

Catalytic Chemistry for Methane Dehydroaromatization (MDA) on a Bifunctional Mo/HZSM-5 Catalyst in a Packed Bed

Karakaya

Morejudo

Zhu

et al. 2016

Ind. Eng. Chem. Res.

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This paper presents an experimental and modeling study of methane dehydroaromatization (MDA) chemistry using a bifunctional 6 wt % Mo/HZSM-5 catalyst in an isothermal laboratory-scale packed-bed configuration. The reported measurements include methane conversion and product yields and selectivities as a function of temperature and flow rates (space velocity). The modeling is particularly concerned with developing and validating a microscopically reversible 54-step detailed reaction mechanism. The reaction mechanism is validated via direct comparison with the measured packed-bed performance. Although the operating conditions for the measurements are relatively limited, the detailed reaction mechanism is expected to have much wider predictive capability.

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Effect of Bed Height on the Performance of a Fixed Mo/HZSM‐5 Bed in Direct Aromatization of Methane

Song

Liu

et al. 2016

Chem Eng & Technol

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The catalyst‐overloading strategy is often employed to extend the catalytic lifetime of fixed catalyst bed reactors in chemical processes. The applicability of this strategy to the Mo/HZSM‐5 catalyst for non‐oxidative methane dehydroaromatization was confirmed for the first time by examining the influence of bed height on the catalytic stability and lifetime aromatic productivity of an integral fixed Mo/HZSM‐5 bed at a defined temperature and different CH4 superficial velocities. Increasing the bed height proved to have a very limited effect on extending either the stable period of aromatics production of the bed or its lifetime aromatics productivity. Simultaneous coke formation over all layers of the bed was also confirmed to be responsible for rapid deactivation of the whole bed, and pyrolysis of the intermediate C2H4 was found to be the dominant route to coke formation.

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NGU: Development of a two‐bed circulating fluidized bed reactor system for nonoxidative aromatization of methane over Mo/HZSM‐5 catalyst

Cited by 16 publications

References 29 publications

Structured Ni@NaA zeolite supported on silicon carbide foam catalysts for catalytic carbon dioxide methanation

Structured Ni@NaA zeolite supported on silicon carbide foam catalysts for catalytic carbon dioxide methanation

Catalytic Chemistry for Methane Dehydroaromatization (MDA) on a Bifunctional Mo/HZSM-5 Catalyst in a Packed Bed

Effect of Bed Height on the Performance of a Fixed Mo/HZSM‐5 Bed in Direct Aromatization of Methane

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