Effective and selective oxidation of 2-butanol over Mn supported catalyst systems

Prabu, K.M.; Prabu, Marimuthu; Venugopal, Ashok Kumar; Venugopalan, Aswathy Thareparambil; Sandilya, W. V. Y. S.; Gopinath, Chinnakonda S.; Raja, Thirumalaiswamy

doi:10.1016/j.apcata.2016.08.005

Cited by 12 publications

(10 citation statements)

References 32 publications

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“…In the temperature range of 325–400°C, % selectivity of MEK lost approximately 33% of its value, see Figure 6A. This may be attributed to the partial oxidation of some MEK to the corresponding compounds, at this temperature range and with the presence of H 2 ‐located on the basic sites over the ZnO surface, that is, acetone and methanol, 63 as presented in Figure 7. As previously reported for the selective oxidation of 2B in oxygen over Mn‐supported catalysts at 300°C, 63 two compounds were identified by GC during each injection.…”

Section: Resultsmentioning

confidence: 91%

“…This may be attributed to the partial oxidation of some MEK to the corresponding compounds, at this temperature range and with the presence of H 2 ‐located on the basic sites over the ZnO surface, that is, acetone and methanol, 63 as presented in Figure 7. As previously reported for the selective oxidation of 2B in oxygen over Mn‐supported catalysts at 300°C, 63 two compounds were identified by GC during each injection. Besides, two other products of the dehydration reaction of 2B were identified with very low % selectivity cis ‐ and trans ‐2‐butene.…”

Section: Resultsmentioning

confidence: 92%

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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: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 92%

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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“…The Mn 2p 3/2 spectra of the samples decomposed into three characteristic peaks corresponding to Mn 2+ , Mn 3+ , and Mn 4+ species at binding energies of 640.2–640.5, 641.6–641.9, and 643.3–644.0 eV, respectively. − In the MnO x /Al 2 O 3 -P-800 and MnO x /Al 2 O 3 -I-800 samples, the Mn 2p 3/2 peak shows the presence of a shake-up satellite peak. This shoulder around a binding energy of 646.3 eV was attributed to the satellite peak of MnO. ,− The results indicated that Mn 3+ is the dominant state of Mn in all catalysts. The amount of Mn 2+ species on the surface of polyol catalysts was higher than the impregnated ones.…”

Section: Resultsmentioning

confidence: 98%

Enhancing Catalytic Ozonation of Acetone and Toluene in Air Using MnO_x/Al₂O₃ Catalysts at Room Temperature

Ghavami

Soltan

Chen

2021

Ind. Eng. Chem. Res.

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A series of MnO x /Al2O3 catalysts were synthesized by polyol and dry impregnation methods and calcined in the range of 400–800 °C. The impact of the preparation procedure and calcination temperature was investigated to enhance the catalytic degradation of a single component and binary mixtures of acetone and toluene at room temperature. The polyol method produces catalysts with a higher surface area, smaller cluster size, and lower oxidation state than the impregnation method. The results indicated that the oxidation state of manganese shifted to lower values by increasing the calcination temperature, which had a beneficial influence on the catalytic performance. As calcination temperature increases to 800 °C, the catalyst exhibited excellent catalytic activity in acetone degradation while no significant change was observed in degradation of toluene. In the binary mixture, toluene conversion was promoted whereas the acetone conversion was inhibited. X-ray absorption near-edge structure and extended X-ray absorption fine structure results of the spent catalysts showed that, unlike acetone, toluene altered the local structure of manganese oxides during the reaction. The catalyst was susceptible for the reduction process with toluene due to the accumulation of carbonaceous species resulting from incomplete oxidation of toluene.

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“…2-butanol is widely used as a pharmaceutical standard 17 , solvent 18 , and fuel additive 19 . Among these applications, it is a crucial intermediate in the chemical production of 1butene, 2-butene 20 , butyl acetate 21,22 , sec-butyl acetate 21 , and methyl ethyl ketone (MEK) 23 . Moreover, it has a large market potential as a biofuel and other synthetic applications.…”

Section: Introductionmentioning

confidence: 99%

Low-temperature selective ethanol upgrading to primary or secondary alcohols by homogeneous catalysis

Padilla

Mello

et al. 2022

Preprint

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Ethanol is one of the most promising renewable resources for the production of key industrial commodities. Herein, we present the first direct and selective conversion of ethanol to either primary or secondary alcohols, or to hydrocarbons, using ruthenium PNP pincer complexes [(RPNP)RuHXCO] (R= iPr, Ph, Cy, tBu; X = Cl, H-BH3) as catalysts. Using phenyl substituted phosphines leads to the selective produc-tion of secondary alcohols. Hence, employing [(PhPNP)RuH(Cl)CO] (Ru-1) as a catalyst in ethanol, containing 20 mol% of NaOEt, at 115 ⁰C leads to 89% selective production of secondary alcohols over pri-mary alcohols. A yield of 12% of 2-butanol, and in total 22% of secondary alcohols, was achieved. In addition, minor amounts of 2 butenes/butane (≤5%) were observed in the gas phase. On the contrary, when using bulky phosphine substituents, such as t-butyl, the selectivity completely shifts toward primary alcohols. Thus, using [(tBuPNP)RuH(Cl)CO] (Ru 5) leads to >99% selectivity of 1 butanol (13% yield) over secondary alcohols at 115 ⁰C. In fact, the catalytic system is highly competitive for producing 1-butanol with 22% yield obtained at 130 ⁰C, a temperature significantly lower than previously re-ported systems. Our methodology unveils the potential for using bulk bio-alcohols to selectively produce primary or secondary alcohols and hydrocarbons under mild conditions.

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Effective and selective oxidation of 2-butanol over Mn supported catalyst systems

Cited by 12 publications

References 32 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

Enhancing Catalytic Ozonation of Acetone and Toluene in Air Using MnO_x/Al₂O₃ Catalysts at Room Temperature

Low-temperature selective ethanol upgrading to primary or secondary alcohols by homogeneous catalysis

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Effective and selective oxidation of 2-butanol over Mn supported catalyst systems

Cited by 12 publications

References 32 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

Enhancing Catalytic Ozonation of Acetone and Toluene in Air Using MnOx/Al2O3 Catalysts at Room Temperature

Low-temperature selective ethanol upgrading to primary or secondary alcohols by homogeneous catalysis

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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

Enhancing Catalytic Ozonation of Acetone and Toluene in Air Using MnO_x/Al₂O₃ Catalysts at Room Temperature