Direct cascade hydrogenation of biorenewable levulinic acid to valeric acid biofuel additives over metal (M = Nb, Ti, and Zr) supported SBA-15 catalysts

Pothu, Ramyakrishna; Mitta, Harisekhar; Boddula, Rajender; Balla, Putrakumar; Raveendra, G.; Perupogu, Vijayanand; Ma, Jianmin

doi:10.1016/j.mset.2022.09.006

Cited by 5 publications

(3 citation statements)

References 46 publications

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“…In addition, the strong adsorption peak at about 350-400 nm demonstrates the TiO2 particle with a size is the larger than 5 nm [38]. After metal doping, the obtained band at 200-240 nm is attributed to the metal-doped SBA-15 framework silica [39]. The absorption range of the synthesized photocatalyst increased compared to the Ti-SBA-15.…”

Section: Figurementioning

confidence: 93%

The effect of metal-titania interaction on photodegradation in SBA-15-supported metal-titania photocatalysts

Göl

Akbay

2023

CI&CEQ

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Several transition metals (Fe, Cu, Ni, Cr, and Co) were inserted into the Ti-SBA-15 using two-step synthesis methods. XRD, SEM-EDX, N2 adsorption-desorption isotherms, XRF, and UV-DRS analysis were used for characterizations. The results confirm the preservation of an ordered mesoporous structure and well-dispersed Ti-metal, and enhanced the absorption of light compared with Ti-SBA-15. The photocatalytic performances were evaluated in the degradation of methylene blue under UV light. The results show that the Co-Ti-SBA-15 exhibited the highest photocatalytic activity among the prepared photocatalysts for the degradation of methylene blue. The significant activity increase might be attributed to the increased reactant adsorption by the mesoporous structure of SBA-15, the good distribution of TiO2 in the pores of SBA-15, and the increased electron transfer mobility due to metal doping. In addition to efficiency, Co-Ti-SBA-15 is a suitable catalyst for dye degradation, exhibiting good stability in methylene blue degradation over five photocatalytic runs without any deviation of the structure.

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Section: Figurementioning

confidence: 93%

The effect of metal-titania interaction on photodegradation in SBA-15-supported metal-titania photocatalysts

Göl

Akbay

2023

CI&CEQ

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“…The temperature effect also has importance for catalytic performance [14,34]. Hence, the catalytic systems were investigated at different reaction temperatures between 160 • C to 280 • C to optimize the reaction temperature for the esterification of LA with ethanol.…”

Section: Effect Of Reaction Temperaturementioning

confidence: 99%

High Dispersion of Platinum Nanoparticles over Functionalized Zirconia for Effective Transformation of Levulinic Acid to Alkyl Levulinate Biofuel Additives in the Vapor Phase

Pothu

Mameda²,

Mitta³

et al. 2022

J. Compos. Sci.

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In recent years, functionalized metal oxides have been gaining popularity for biomass conversion to fuels and chemicals due to the global energy crisis. This study reports a novel catalyst based on noble metal immobilization on functionalized zirconia that has been successfully used in the production of biofuel alkyl levulinates (ALs) from lignocellulosic biomass-derived levulinic acid (LA) under vapor-phase. The wet impregnation method was used to immobilize Pt-metal nanoparticles on zirconia-based supports (silicotungstic acid zirconia, STA-ZrO2; sulfated zirconia, S-ZrO2; and tetragonal zirconia, t-ZrO2). A variety of physicochemical techniques were used to characterize the prepared catalysts, and these were tested under atmospheric pressure in continuous flow esterification of LA. The order of catalytic activity followed when ethyl levulinate was produced from levulinic acid via esterification: Pt/STA-ZrO2 ≫ Pt/S-ZrO2 ≫ Pt/t-ZrO2. Moreover, it was found that ALs synthesis from LA with different alcohols utilizing Pt/STA-ZrO2 catalyst followed the order ethyl levulinate ≫ methyl levulinate ≫ propyl levulinate≫ butyl levulinate. This work outlines an excellent approach to designing efficient catalysts for biofuels and value-added compounds made from biomass.

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“…It can also be obtained from cellulose, hemicellulose, and other carbohydrate-rich materials through various conversion processes. LA possesses several desirable properties that make it an attractive starting material for chemical synthesis [6][7][8]. It is water-soluble, stable under mild reaction conditions, and exhibits a high degree of functional group compatibility.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Valorisation of Biomass-Derived Levulinic Acid to Biofuel Additive γ-Valerolactone: Influence of Copper Loading on Silica Support

Boddula,

Shanmugam,

Srivatsava

et al. 2023

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γ-valerolactone (GVL) is a crucial chemical feedstock used in the production of fuel additives, renewable fuels, and fine chemicals alternative to petroleum-based solvents and chemicals, supporting the transition to sustainable energy solutions. It is promptly acquired by hydrogenating levulinic acid (LA) in a gaseous or liquid phase with a homogeneous or heterogeneous catalyst using a variety of recognized catalytic processes. Herein, this work focuses on the use of silica-supported copper (Cu/SiO2) catalysts for the gas-phase hydrogenation of LA to GVL under mild reaction conditions. The study analyzes how copper loading can affect the catalytic activity of the Cu/SiO2, while the flow rate of LA, time-on-stream, reaction temperature, and LA concentration affect the catalytic efficiency. The SiO2 support’s various Cu loadings are crucial for adjusting the catalytic hydrogenation activity. One of the studied catalysts, a 5 wt% Cu/SiO2 catalyst, demonstrated ~81% GVL selectivity with ~78% LA conversion and demonstrated stability for ~8 h while operating at atmospheric pressure and temperature (265 °C) and 0.5 mL/h of LA flow rate. The ability to activate hydrogen, high amount of acidic sites, and surface area were all discovered to be advantageous for increased GVL selectivity.

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Direct cascade hydrogenation of biorenewable levulinic acid to valeric acid biofuel additives over metal (M = Nb, Ti, and Zr) supported SBA-15 catalysts

Cited by 5 publications

References 46 publications

The effect of metal-titania interaction on photodegradation in SBA-15-supported metal-titania photocatalysts

The effect of metal-titania interaction on photodegradation in SBA-15-supported metal-titania photocatalysts

High Dispersion of Platinum Nanoparticles over Functionalized Zirconia for Effective Transformation of Levulinic Acid to Alkyl Levulinate Biofuel Additives in the Vapor Phase

Catalytic Valorisation of Biomass-Derived Levulinic Acid to Biofuel Additive γ-Valerolactone: Influence of Copper Loading on Silica Support

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