Sequential Condensation and Hydrodeoxygenation Reaction of Furfural-Acetone Adduct over Mix Catalysts Ni/SiO&lt;sub&gt;2&lt;/sub&gt; and Cu/SiO&lt;sub&gt;2&lt;/sub&gt; in Water

Ulfa, Siti Mariyah; Ohorella, Rizka Fauzia; Astutik, Caterina Widya

doi:10.22146/ijc.26736

Cited by 13 publications

(3 citation statements)

References 19 publications

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“…S 3 ). The characteristic peak of the samples was indexed to Ca(OH) 2 32 – 34 , Ca 2 H 0.60 O 4.30 Si 35 , 36 , Ca 6 H 2 O 13 Si 3 37 , 38 , SiO 2 39 . As shown in the supplementary information (Table S 2 ), thermal conductivities of the CAST 11 LW, CAST 13 LW and CAST 15 LW cement mortars between the temperature range of 400 to 1000 °C are temperature dependents.…”

Section: Resultsmentioning

confidence: 99%

Fabrication and thermoelectric conversion of thermoelectric concrete brick with buried unileg N-type CaMnO3 thermoelectric module inside

Maneesai

Khammahong

Siripoom

et al. 2023

Sci Rep

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To investigate the effect of heat loss reduction due to thermal insulator and thermal interface resistance due to multi-layer structure in order to improve the efficiency of a thermoelectric device, a thermoelectric concrete brick was fabricated using a unileg n-type CaMnO3 thermoelectric module inside. CaMnO3 thermoelectric materials were synthesized by starting materials CaCO3 and MnO2 to produce a unileg n-type CaMnO3 module. Thermoelectric concrete brick consisted of two types: I-layer brick (one layer of concrete thermal insulator) and III-layer brick (three layers of different concrete insulators). The occurring temperature difference, electric current and voltage on the CaMnO3 module and thermoelectric concrete brick were measured in closed and open circuits. The temperature difference, thermal distribution, and output voltage when applying constant temperatures of 100, 200 and 400 °C were measured. Computer simulations of the Finite Element Method (FEM) were performed to compare with the experimental results. The trends of the temperature difference and the output voltage from the experimental and computer simulations were in good agreement. The results of the temperature difference during the hotter side temperature of 200 °C exhibited the temperature difference along the vertical direction of the thermoelectric concrete bricks for both types of the III-layer brick of 172 °C and the I-layer brick of 132 °C are larger than that of the CaMnO3 TEG module without using a thermal concrete insulator of 108 °C. The thermoelectric concrete bricks of the III-layer brick type of 27.70 mV displayed output voltage results being higher than those of the I-layer brick of 26.57 mV and the CaMnO3 TEG module without using a thermal concrete insulator of 24.35 mV. Thermoelectric concrete brick of the III-layer brick type displayed higher electric generation power than the I-layer brick and the CaMnO3 TEG module. Additionally, the results exhibited the capability of thermoelectric concrete brick in the III-layer brick model for electric generation power based on the temperature difference. The TEG concrete brick of I-layer concrete covering the series–parallel combination circuit of 120 modules of the unileg n-type CaMnO3 was constructed and then embedded on the outer surface of the furnace. During the maximum hotter side temperature of 580 °C of the concrete brick, the temperature difference between the hotter side and the cooler side of the brick occurred at 365 °C and the maximum output voltage was obtained at 581.7 mV.

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Section: Resultsmentioning

confidence: 99%

Fabrication and thermoelectric conversion of thermoelectric concrete brick with buried unileg N-type CaMnO3 thermoelectric module inside

Maneesai

Khammahong

Siripoom

et al. 2023

Sci Rep

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“…were detected at 26, 35, 56, and 68° [12]. After the modification, new peaks at 2θ values of 39 and 60º correspond to SiO2 detected [13], indicating the activated carbon surface may be functionalized by APTES.…”

Section: Characterization Of the Activated Carbon And Modified Activated Carbonmentioning

confidence: 95%

Cu(II), Pb(II) and Cr(VI) Adsorption on the Modified Activated Carbon

Nasanjargal¹,

Bat-Amgalan²,

Aleksandr³

et al. 2021

Atlantis Highlights in Chemistry and Pharmaceutical Sciences

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In this study, the sorptions of Cu(II), Pb(II), and Cr(VI) on amine-functionalized activated carbon were investigated. Coal from the Tavantolgoi deposit of Mongolia was used as a precursor for the modification. After the coal carbonization, the char was activated with heated steam at different times (120, 180, and 240 min) and several temperatures (800ºC and 850ºC). The activated carbon at 850ºC for 240 min was used for the treatment with 3-aminopropyltriethoxysilane (APTES). The interactions between metal ions and functional groups on the sorbent surface were confirmed by Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM) coupled with X-ray energy dispersive spectroscopy (EDS). The influence of various parameters such as pH (2-7), contact time (0.5-6 h), temperature (25ºC, 35ºC, 45ºC, and 55ºC), initial concentration of heavy metals ions (10, 25, and 50 mg/L), and common cations (Na + , K + , Ca 2+ , Mg 2+ ) was investigated. The optimum pH for Cu(II), Pb(II), and Cr(VI) sorption on the modified activated carbon was chosen as 4, 3, and 3, respectively. The sorption capacity was increased from 6.15 to 9.88 mg/g and 17.1 mg/g to 19.0 mg/g when increased the temperature from 25ºC to 55ºC for Cu(II) and Cr(VI) adsorption, respectively (initial concentration of metal ions were 50 mg/L). But the sorption capacity was decreased from 3.13 mg/g to 2.69 mg/g when increased the temperature from 25ºC to 55ºC for Pb(II) adsorption. The thermodynamic parameters such as enthalpy (ΔHº), entropy (ΔSº), and Gibb's free energy (ΔGº) were estimated, and the results confirmed that all sorption processes are spontaneous and thermodynamically favorable. The sorption capacity was decreased when the amount of Na + , K + , Ca 2+ , or Mg 2+ increased from 0 to 200 mg/L, and a remarkable decrease in sorption capacity was observed for Pb(II) adsorption. The order of adsorption capacity of modified activated carbon for metal ions was Cr(VI) Cu(II) Pb(II). The sorption mechanism was discussed for the processes.

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“…The hydrodeoxygenation reaction (HDO) was according to published methods by our group [24]. Before the reaction, each catalyst Ni/Al2O3-ZrO2 and Ni/SiO2-ZrO2 (0.2 g) was activated by heating at 350 °C for 1 h under 2 MPa H2 gas in the reactor before each run.…”

Section: Waste Cooking Oil Hydrodeoxygenation Reactionmentioning

confidence: 99%

The Production of Green Diesel Rich Pentadecane (C15) from Catalytic Hydrodeoxygenation of Waste Cooking Oil using Ni/Al2O3-ZrO2 and Ni/SiO2-ZrO2

Sowe

Lestari

Novitasari

et al. 2021

Bull. Chem. React. Eng. Catal.

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Hydrodeoxygenation (HDO) is applied in fuel processing technology to convert bio-oils to green diesel with metal-based catalysts. The major challenges to this process are feedstock, catalyst preparation, and the production of oxygen-free diesel fuel. In this study, we aimed to synthesize Ni catalysts supported on silica-zirconia and alumina-zirconia binary oxides and evaluated their catalytic activity for waste cooking oil (WCO) hydrodeoxygenation to green diesel. Ni/Al2O3-ZrO2 and Ni/SiO2-ZrO2 were synthesized by wet-impregnation and hydrodeoxygenation of WCO was done using a modified batch reactor. The catalysts were characterized using X-ray diffraction (XRD), X-ray fluorescence (XRF), and scanning electron microscopy - energy dispersive X-ray spectroscopy (SEM-EDS), and N2 isotherm adsorption-desorption analysis. Gas chromatography - mass spectrometry (GC-MS) analysis showed the formation of hydrocarbon framework n-C15 generated from the use of Ni/Al2O3-ZrO2 with the selectivity of 68.97% after a 2 h reaction. Prolonged reaction into 4 h, decreased the selectivity to 58.69%. Ni/SiO2-ZrO2 catalyst at 2 h showed selectivity of 55.39% to n-C15. Conversely, it was observed that the reaction for 4 h increased selectivity to 65.13%. Overall, Ni/Al2O3-ZrO2 and Ni/SiO2-ZrO2 catalysts produced oxygen-free green diesel range (n-C14-C18) enriched with n-C15 hydrocarbon. Reaction time influenced the selectivity to n-C15 hydrocarbon. Both catalysts showed promising hydrodeoxygenation activity via the hydrodecarboxylation pathway. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

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Sequential Condensation and Hydrodeoxygenation Reaction of Furfural-Acetone Adduct over Mix Catalysts Ni/SiO<sub>2</sub> and Cu/SiO<sub>2</sub> in Water

Abstract: Sequential condensation and hydrodeoxygenation reaction were perform using autoclave batch reactor in the presence of water as a solvent. The condensation of furfural and acetone was performed using MgO

Cited by 13 publications

References 19 publications

Fabrication and thermoelectric conversion of thermoelectric concrete brick with buried unileg N-type CaMnO3 thermoelectric module inside

Fabrication and thermoelectric conversion of thermoelectric concrete brick with buried unileg N-type CaMnO3 thermoelectric module inside

Cu(II), Pb(II) and Cr(VI) Adsorption on the Modified Activated Carbon

The Production of Green Diesel Rich Pentadecane (C15) from Catalytic Hydrodeoxygenation of Waste Cooking Oil using Ni/Al2O3-ZrO2 and Ni/SiO2-ZrO2

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