The effect of the preparation on the catalytic activity of ZnO/TiO2 in the methanol steam reforming reaction

Pinzari, F.

doi:10.1007/s11144-021-02044-2

Cited by 3 publications

(4 citation statements)

References 52 publications

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“…According to the abovementioned and illustrated results, the use of pure ZnO as pure or modified with 1–10% K 2 O calcined at 400°C for 3 h in oxygen, the following remarks can be summarized as follows: Because of its high activity, ZnO is a multitalented, flattering oxide in many processes 1–24 . ZnO as pure and modified catalysts were easily prepared herein and characterized by their nanoscale crystallite size in, that is, 22.9–28.0 nm, high basicity (ca.…”

Section: Conclusive Remarksmentioning

confidence: 99%

“…Because of its high activity, ZnO is a multitalented, flattering oxide in many processes 1–24 . ZnO as pure and modified catalysts were easily prepared herein and characterized by their nanoscale crystallite size in, that is, 22.9–28.0 nm, high basicity (ca.…”

Section: Conclusive Remarksmentioning

confidence: 99%

“…Nano-scale particles of metal oxides such as ZnO, whether pure, promoted with additives or supported on other oxides, have recently attracted many researchers to study their physical properties and catalytic activities in many catalytic reactions. Including methanol synthesis via CO 2 hydrogenation, [1][2][3] photocatalytic degradation of dyes, 4 Suzuki-Miyaura cross-coupling reaction, 5 biodiesel production, 6,7 steam reforming reaction of methanol, 8,9 synthesis of dimethyl ether from syngas, 10 ester hydrogenolysis, 11 H 2 -production, 12 transesterification synthesis of ethyl methyl carbonate. 13 ZnO is considered a nontoxic material owing to its relatively fast electron mobility, high conductivity, photo-corrosion resistance, and low availability.…”

Section: Introductionmentioning

confidence: 99%

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Highly basic and active ZnO–x% K₂O nanocomposite catalysts for the production of methyl ethyl ketone biofuel

Halawy

Osman

Rooney

2022

Energy Science & Engineering

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Herein we demonstrate the preparation and characterization of nanocrystalline ZnO, either pure or promoted with 1–10 wt.% K2O. All catalysts calcined at 400°C were in the nano‐crystallite scale as confirmed by X‐ray powder diffraction analysis in the 22.9–28.0 nm range. According to the CO2‐temperature‐programmed desorption study using thermogravimetric analysis and differential scanning calorimetry techniques, they have a broad spectrum of surface basic sites. Because of the significance of methyl ethyl ketone (MEK) as a next‐generation biofuel candidate with high‐octane, low boiling point, and relatively high vapor pressure. The prepared catalysts were examined during the direct production of MEK via 2‐butanol (2B) dehydrogenation. Among catalysts tested, ZnO promoted with 1% K2O showed a superior catalytic activity towards the conversion of 2B to MEK, that is, 71.7% at a reaction temperature of 275°C. The selectivity for the production of MEK over all catalysts was ≥95% across all catalysts when using N2‐gas as a carrier. The use of airflow in this reaction resulted in a clear loss of selectivity toward MEK production as well as the appearance of undesirable products such as acetone and methanol. All catalytic properties of catalysts, particularly those of moderate strength, were highly correlated with the distribution of surface basic sites. Finally, a reaction mechanism was proposed for the dehydrogenation of 2B, followed by the partial oxidation of MEK.

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Section: Conclusive Remarksmentioning

confidence: 99%

Section: Conclusive Remarksmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Highly basic and active ZnO–x% K₂O nanocomposite catalysts for the production of methyl ethyl ketone biofuel

Halawy

Osman

Rooney

2022

Energy Science & Engineering

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“…Our previous study [9,10] focused on the system ZnO/TiO 2 , showed that it is active in methanol steam reforming with a complete reaction at T = 400 °C and GHSV (CH 3 OH) = 5 * 10 4 h −1 . The activity of the system was attributed to the ZnO phase, TiO 2 was useful to enhance surface area and to decrease CO formation, the best results were found when χ Zn = 0.05, segregation of ZnO was evident with higher Zn content, which caused the decrease in surface area and subsequent inhibition of the reaction.…”

Section: Introductionmentioning

confidence: 99%

The effect of nanocrystalline TiO2 on structure and catalytic activity of CuO–ZnO in combined methanol reforming

Pinzari¹

2023

Reac Kinet Mech Cat

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CuO–ZnO (CZ) and CuO–ZnO/TiO2 (CZT) catalysts have been prepared by co-precipitation, characterized by X-ray diffraction, surface area measurements and chemical analysis and tested in the combined methanol reforming reaction. Catalytic tests have been performed in the temperature range 200–400 °C with a GHSV = 55.000 h−1, after H2 reducing pretreatment at 250 °C or 450 °C. It is shown that nanocrystalline TiO2 influences the CuO–ZnO nanosized structure, reducibility and reactivity. TiO2 slightly increases ZnO crystallite size of the fresh catalyst. Moreover, it causes the CuO chemical reduction to nanosized Cu2O on exhaust catalyst pretreated in hydrogen at 250 °C, this improves the reaction with higher methanol conversion and hydrogen production. On the contrary, TiO2 reduces CuO to submicron Cu0 and greatly increases ZnO crystallite size on the exhaust catalyst pretreated in hydrogen at 450 °C, this treatment weakens the reaction, with lower methanol conversion and hydrogen production. In both cases, nanocrystalline TiO2 presence is able to decrease the CO formation: independently of the hydrogen pretreatment temperature. This ability of the nanocrystalline TiO2 is ascribed to the presence of the oxygen vacancies, which act as electron donors that contribute to hinder CO2 and H2 surface adsorption for steric, electrostatic and probabilistic factors.

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Fe–Ni–Ce–Zr-modified CuO–ZnO catalyst for methanol steam reforming

Zhang

Ren

Xie

et al. 2023

Journal of the Energy Institute

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The effect of the preparation on the catalytic activity of ZnO/TiO2 in the methanol steam reforming reaction

Cited by 3 publications

References 52 publications

Highly basic and active ZnO–x% K₂O nanocomposite catalysts for the production of methyl ethyl ketone biofuel

Highly basic and active ZnO–x% K₂O nanocomposite catalysts for the production of methyl ethyl ketone biofuel

The effect of nanocrystalline TiO2 on structure and catalytic activity of CuO–ZnO in combined methanol reforming

Fe–Ni–Ce–Zr-modified CuO–ZnO catalyst for methanol steam reforming

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The effect of the preparation on the catalytic activity of ZnO/TiO2 in the methanol steam reforming reaction

Cited by 3 publications

References 52 publications

Highly basic and active ZnO–x% K2O nanocomposite catalysts for the production of methyl ethyl ketone biofuel

Highly basic and active ZnO–x% K2O nanocomposite catalysts for the production of methyl ethyl ketone biofuel

The effect of nanocrystalline TiO2 on structure and catalytic activity of CuO–ZnO in combined methanol reforming

Fe–Ni–Ce–Zr-modified CuO–ZnO catalyst for methanol steam reforming

Contact Info

Product

Resources

About

Highly basic and active ZnO–x% K₂O nanocomposite catalysts for the production of methyl ethyl ketone biofuel

Highly basic and active ZnO–x% K₂O nanocomposite catalysts for the production of methyl ethyl ketone biofuel