The catalytic effect of H2 in the dehydrogenation coupling production of ethylene glycol from methanol using a dielectric barrier discharge

Zhang, Jing; Li, Teng; Wang, Dongjiang; Zhang, Jialiang; Guo, Hongchen

doi:10.1016/s1872-2067(14)60239-4

Cited by 8 publications

(4 citation statements)

References 25 publications

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“…Cr 19.9 wt %, Ni 8.1 wt %, Mn 2.0 wt %, Si 0.5 wt %,Cu 0.7 wt %, Ag 0.1 wt %, Al 0.1 wt %, and C 0.1 wt %); it was installed along the axis of the quartz tube. An alternating current (AC) supply was used, 38 and a catalyst was embedded in the plasma zone. Before discharge, an NH 3 feed (99.999% purity) was flowed through the reactor for 30 min to remove air, and then the DBD plasma was generated by switching on the AC power supply.…”

Section: Methodsmentioning

confidence: 99%

NH₃ Decomposition for H₂ Generation: Effects of Cheap Metals and Supports on Plasma–Catalyst Synergy

et al. 2015

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NH 3 decomposition is important because of its potential use in generating CO-free H 2 . In this study, several cheap metals (Fe, Co, Ni, and Cu) and a series of supports (zeolite materials: TS-1 um, TS-1 nm, HZSM-5 nm, and NaZSM-5 nm; SiO 2 -based materials: fumed SiO 2 and SiO 2 -ball; and metal oxide materials: r′-Al 2 O 3 and TiO 2 ) were used to prepare supported catalysts. X-ray fluorescence, N 2 physisorption, X-ray diffraction, transmission electron microscopy, Fourier-transform infrared spectroscopy, temperatureprogrammed desorption, mass spectrometry, temperatureprogrammed reduction, and electrical property analysis were used to investigate the effect of the catalyst on the synergy between a plasma (produced by dielectric barrier discharge) and the catalyst in NH 3 decomposition. The results show that the synergy depends strongly on the strength of the metal− nitrogen (M−N) bond, and the relative dielectric constant (ε d ) of the support. When Fe, Co, Ni, and Cu were supported on fumed SiO 2 , the order of the strengths of the M−N bonds was Cu−N < Ni−N < Co−N < Fe−N. Among the catalysts, Co/ fumed SiO 2 showed a stronger synergy with the plasma and gave higher NH 3 conversion in plasma catalysis. Co catalysts supported on fumed SiO 2 , SiO 2 -ball, and r′-Al 2 O 3 , which have small ε d values, had stronger synergies with plasma and therefore gave higher NH 3 conversions. The relative dielectric constant of the support correlated well with NH 3 conversion in plasma catalysis. These results show that the relative dielectric constant is an essential parameter in developing catalyst supports for plasma conditions. This study provides direct proof that the recombinative desorption of adsorbed N atoms is the rate-limiting step in the catalytic decomposition of NH 3 over cheap metal catalysts such as Fe, Co, and Ni and that there is synergy between plasma and cheap metal catalysts in plasma-catalytic NH 3 decomposition.

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Section: Methodsmentioning

confidence: 99%

NH₃ Decomposition for H₂ Generation: Effects of Cheap Metals and Supports on Plasma–Catalyst Synergy

et al. 2015

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“…As shown in Figure 6 the CH 3 OH conversion, while the H species were mostly from the electron-impact dissociation of H 2 O. [30][31][32] Additionally, when the H 2 O ratio was 25%, the C and H balances could reach the highest value of 96.9% and 99.9%, respectively.…”

Section: Effect Of H 2 O Ratiomentioning

confidence: 91%

“…As the addition of H 2 O, the electron collision reaction of H 2 O produced a large amount of H and OH (Equation 32). [30] Both H and OH could carry out the dehydrogenation reaction with CH 3 OH to CH 2 OH (Equations 33 and 34), [31,32,39,46] which contributed to the synthesis of alcohols (Equations 25-27). Meanwhile, as an important radical, OH could also directly react with C x H y to produce some alcohols (Equations 35 and 36).…”

Section: Summary Of Reaction Mechanismsmentioning

confidence: 99%

Parametric investigations on plasma‐activated conversion of CH₄–CH₃OH to C2–C4 alcohols by nanosecond pulsed discharge

Gao

Dou

et al. 2022

Plasma Processes & Polymers

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“…Methanol, as an important industrial intermediate, − has a growing demanding for consumption worldwide. The most widely employed catalysts for synthesizing methanol are Cu/ZnO catalysts − whose synthetic method is processed mainly by coprecipitation. − Starting from precipitates, a series of microstructural changes will occur with consecutive effect during their evolution process when preparing Cu/ZnO catalysts .…”

Section: Introductionmentioning

confidence: 99%

Effect of Water Layer in a Microreactor on the Low-Temperature Synthesis of High-Activity Cu/ZnO Catalysts

Chen

Jiang

et al. 2019

Ind. Eng. Chem. Res.

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The effect of a water layer on the precipitation process in a three-channel microreactor at low temperatures was investigated. Fourier-transform infrared spectroscopy, Xray powder diffraction, thermal gravimetric analysis, X-ray photoelectron spectroscopy, temperature-programmed reduction, and Brunauer−Emmett−Teller analysis were employed for studying the structural evolution of the intermediate products during the preparation of both zincian georgeitederived and zincian malachite-derived catalysts, and catalytic activities were measured for methanol synthesis from syngas. It is manifested that the effect of uniform precipitates acts consecutively on the subsequent aging process, Zn incorporation in precursors, thermal decomposition, reduction, and catalytic performance of the catalysts. Numerical simulation revealed the change of species properties, and reaction rates at varying temperatures can lead to different regulations of the water layer, denoting that disparate ratios of the water layer were required for obtaining uniform precipitates under different conditions, which further suggests the key role of uniformity of the precipitates in preparing high-activity Cu/ZnO catalysts.

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The catalytic effect of H2 in the dehydrogenation coupling production of ethylene glycol from methanol using a dielectric barrier discharge

Cited by 8 publications

References 25 publications

NH₃ Decomposition for H₂ Generation: Effects of Cheap Metals and Supports on Plasma–Catalyst Synergy

NH₃ Decomposition for H₂ Generation: Effects of Cheap Metals and Supports on Plasma–Catalyst Synergy

Parametric investigations on plasma‐activated conversion of CH₄–CH₃OH to C2–C4 alcohols by nanosecond pulsed discharge

Effect of Water Layer in a Microreactor on the Low-Temperature Synthesis of High-Activity Cu/ZnO Catalysts

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The catalytic effect of H2 in the dehydrogenation coupling production of ethylene glycol from methanol using a dielectric barrier discharge

Cited by 8 publications

References 25 publications

NH3 Decomposition for H2 Generation: Effects of Cheap Metals and Supports on Plasma–Catalyst Synergy

NH3 Decomposition for H2 Generation: Effects of Cheap Metals and Supports on Plasma–Catalyst Synergy

Parametric investigations on plasma‐activated conversion of CH4–CH3OH to C2–C4 alcohols by nanosecond pulsed discharge

Effect of Water Layer in a Microreactor on the Low-Temperature Synthesis of High-Activity Cu/ZnO Catalysts

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Product

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NH₃ Decomposition for H₂ Generation: Effects of Cheap Metals and Supports on Plasma–Catalyst Synergy

NH₃ Decomposition for H₂ Generation: Effects of Cheap Metals and Supports on Plasma–Catalyst Synergy

Parametric investigations on plasma‐activated conversion of CH₄–CH₃OH to C2–C4 alcohols by nanosecond pulsed discharge