Production of hydrogen from bioethanol in Cu–Ni/NbxOy catalysts obtained by different preparation methods

Silva, Fernando Alves da; Pontes, Isabela Dancini; Wurzler, Gleicielle Tozzi; Alonso, Christian Gonçalves; Medina, A. N.; Scaliante, Mara Heloísa Neves Olsen; DeSouza, Marcos; Fernandes-Machado, Nádia Regina Camargo

doi:10.1016/j.ijhydene.2015.12.215

Cited by 10 publications

(3 citation statements)

References 31 publications

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“…When the temperature increased to 600 °C, H 2 selectivity was 95.2%, while CH 4 selectivity was below 7.2%, and CO 2 selectivity increased to 63.3%; meanwhile, the selectivity to CO increased to 33.3%. These results suggest that CH 4 reforming and the reverse shift reaction were accelerated, while the WGS reaction gradually decreased …”

Section: Resultsmentioning

confidence: 85%

Hydrogen Production by Ethanol Reforming on Supported Ni–Cu Catalysts

2022

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Supported bimetallic Ni–Cu catalysts with different Ni–Cu loadings on alumina (Al2O3), alumina–silica (Al2O3–SiO2), alumina–magnesia (Al2O3–MgO), alumina–zinc oxide (Al2O3–ZnO), and alumina–lanthanum oxide (Al2O3–La2O3) were prepared and tested in ethanol steam reforming for the production of hydrogen (H2). These catalysts were characterized by X-ray diffraction, H2-temperature-programmed reduction, ammonia-temperature-programmed desorption, X-ray photoelectron spectroscopy, thermogravimetry, and differential scanning calorimetry. Cu addition improved the reducibility of NiO. Among the as-prepared catalysts, 30Ni5Cu/Al2O3–MgO and 30Ni5Cu/Al2O3–ZnO demonstrated much higher H2 selectivity and excellent coke resistance compared to the other investigated catalysts. Over 30Ni5Cu/Al2O3–MgO and 30Ni5Cu/Al2O3–ZnO, the respective H2 selectivity was 73.3 and 63.6% at 450 °C and increased to 94.0 and 95.2% at 600 °C. The strong interaction of Ni–Cu and Al2O3–ZnO (or Al2O3–MgO) led to the formation of smaller and highly dispersed CuO and NiO species on the carrier, which is conducive to improved catalytic performance. These Al2O3–MgO- and Al2O3–ZnO-supported bimetallic Ni–Cu materials can be promising catalysts for hydrogen production from ethanol steam reforming.

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Section: Resultsmentioning

confidence: 85%

Hydrogen Production by Ethanol Reforming on Supported Ni–Cu Catalysts

2022

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“…The selectivity of Cu/Nb2O5/Al2O3 to C2H4 was higher than that of Cu/NaY. The TPD-NH3 of this catalyst showed acid sites of greater strength due to the desorption of NH3 at higher temperatures, which may be connected to the higher formation of C2H4 [65]. Lorenzut et al [66] observed the same low selectivity behavior for Cu catalysts supported on ZnO/Al2O3.…”

Section: Catalytic Performance Evaluationmentioning

confidence: 73%

“…Above this temperature, total copper reduction was prevented in both catalytic systems by the interaction between CuO and the support surface [17,64]. Additionally, Cu/Nb2O5/Al2O3 showed a reduction peak with a maximum around 928°C, which was attributed to the partial reduction of Nb2O5 to NbO2 [43,65]. The hydrogen consumption of the Cu/NaY catalyst was 6.16 mmol/gcat, while that of Cu/Nb2O5/Al2O3 was 6.38 mmol/gcat, a slightly higher value due to the partial reduction of Nb2O5.…”

Section: Textural Parametersmentioning

confidence: 95%

Effect of Support on Steam Reforming of Ethanol for H<sub>2</sub> Production with Copper-Based Catalysts

Nippes,

Macruz,

Domingues Gomes

et al. 2024

Preprint

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Catalytic studies for hydrogen production via steam reforming of ethanol (SRE) are essential for process optimization. Likewise, selecting the ideal support for the active phase can be critical to achieve high conversion rates during the catalytic steam reforming. In this work, copper-based catalysts were synthesized using two different supports, NaY zeolite and Nb2O5/Al2O3 mixed oxides. The materials were prepared using wet impregnation and characterized for their physicochemical properties using different analytical techniques. Differences in catalyst morphologies were readily attributed to the characteristics of the support. The Cu/NaY catalyst showed better textural properties than Cu/Nb2O5/Al2O3, resulting in a homogeneous metal dispersion over the support surface. Both catalytic systems were active in SRE, but Cu/NaY resulted in higher ethanol conversions compared to Cu/Nb2O5/Al2O3. Hence, the performance of copper-based catalysts was influenced significantly by the textural properties of the support.

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Dry reforming of methane: Effect of different calcination temperatures of Al₂O₃ and Mg‐Al₂O₃ supports on Ni catalysts

et al. 2022

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Dry reforming of methane (DRM) is an important way to produce synthesis gas, requiring the use of catalysts stable at high temperatures and capable of resisting coke formation. In this work, Ni/Al2O3 and Ni/Mg‐Al2O3 catalysts were synthesized with calcined aluminas at different temperatures (623, 773, 923, and 1073 K) to evaluate the effect of calcination temperature on catalyst properties and performance. The synthesis of catalysts was performed by wet impregnation with predicted levels of Ni (10% w/w) and Mg (5% w/w) in the treated supports. The DRM assays were conducted in an experimental laboratory unit (continuous fixed bed reactor with in‐situ catalyst activation) using a 1:1 (v/v) CH4:CO2 mixture, a weight basis gas hourly space velocity (WGHSV) of 15 L h−1 gcat−1, and operation at 973 K. The reaction product was evaluated by gas chromatography. Variations in CH4 and CO2 conversions and H2/CO ratio were observed, indicating that these catalysts have different physical and chemical characteristics attributed to different effects caused by calcinating the supports (Al2O3 and Mg‐Al2O3) at different temperatures.

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Production of hydrogen from bioethanol in Cu–Ni/NbxOy catalysts obtained by different preparation methods

Cited by 10 publications

References 31 publications

Hydrogen Production by Ethanol Reforming on Supported Ni–Cu Catalysts

Hydrogen Production by Ethanol Reforming on Supported Ni–Cu Catalysts

Effect of Support on Steam Reforming of Ethanol for H<sub>2</sub> Production with Copper-Based Catalysts

Dry reforming of methane: Effect of different calcination temperatures of Al₂O₃ and Mg‐Al₂O₃ supports on Ni catalysts

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Production of hydrogen from bioethanol in Cu–Ni/NbxOy catalysts obtained by different preparation methods

Cited by 10 publications

References 31 publications

Hydrogen Production by Ethanol Reforming on Supported Ni–Cu Catalysts

Hydrogen Production by Ethanol Reforming on Supported Ni–Cu Catalysts

Effect of Support on Steam Reforming of Ethanol for H<sub>2</sub> Production with Copper-Based Catalysts

Dry reforming of methane: Effect of different calcination temperatures of Al2O3 and Mg‐Al2O3 supports on Ni catalysts

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Dry reforming of methane: Effect of different calcination temperatures of Al₂O₃ and Mg‐Al₂O₃ supports on Ni catalysts