Inferring the role of NiO nanoparticles from the thermal behavior of virgin and adsorbed hydrocarbons

Tarboush, Belal J. Abu; Husein, Maen M.

doi:10.1016/j.fuel.2015.01.023

Cited by 13 publications

(3 citation statements)

References 39 publications

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“…For example, lowering the mass from 10 to 5 mg results in improvement of the removal percentage from 57% (22.8 μg g –1 ) to 68% (54.4 μg g –1 ). This might be attributed to the negative aggregation effect, which becomes more pronounced in the ppb range and can be diminished by decreasing the mass of the adsorbent to a certain extent …”

Section: Resultsmentioning

confidence: 99%

“…This might be attributed to the negative aggregation effect, which becomes more pronounced in the ppb range and can be diminished by decreasing the mass of the adsorbent to a certain extent. 74 Moreover, several regeneration experiments for the used Zn-MOF-74 have been performed using a combination of NaCl, HCl, and ethanol. The best recycling result was achieved by using about 0.1 mM HCl in ethanol, and 40% removal efficiency was obtained after the second adsorption cycle for 10.0 mg of the used adsorbent and s 50 ppm As(V) original solution (Figure S6).…”

Section: Experimental and Theoretical Methodsmentioning

confidence: 99%

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Metal–Organic Framework-74 for Ultratrace Arsenic Removal from Water: Experimental and Density Functional Theory Studies

Tarboush

Chouman

Jonderian

et al. 2018

ACS Appl. Nano Mater.

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This study investigates and compares arsenic, As(V), removal from aqueous media using the water-stable zinc metal−organic frameworks (Zn-MOF-74) prepared via room-temperature precipitation (RT-Zn-MOF-74) and a solvothermal procedure (HT-Zn-MOF-74). The Zn-MOF-74 crystals possess average particle sizes of 66 nm and 144 μm for RT-Zn-MOF-74 and HT-Zn-MOF-74, respectively. Moreover, nanosized RT-Zn-MOF-74 exhibited a superior performance to HT-Zn-MOF-74. While the Brunauer− Emmett−Teller surface area of RT-Zn-MOF-74 was smaller than that of HT-Zn-MOF-74, higher adsorption uptake took place on the room-temperature-synthesized ones because of their small particle size and better dispersion. Adsorption isotherm studies showed that the Langmuir isotherm was effective for the adsorption of As(V) onto RT-Zn-MOF-74 and HT-Zn-MOF-74 with maximum adsorption uptake (q max ) values of 99.0 and 48.7 mg g −1 , respectively. These values exceed most reported maximum adsorption capacities at neutral pH. The thermodynamics of adsorption revealed a spontaneous endothermic process that is due to the substitution of adsorbed water molecules by arsenate in the pores of the MOF crystal. This was further investigated using plane-wave density functional theory calculations. This study constitutes direct evidence for the importance of tuning the size of the MOF crystals to enhance their properties.

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Section: Resultsmentioning

confidence: 99%

Section: Experimental and Theoretical Methodsmentioning

confidence: 99%

Metal–Organic Framework-74 for Ultratrace Arsenic Removal from Water: Experimental and Density Functional Theory Studies

Tarboush

Chouman

Jonderian

et al. 2018

ACS Appl. Nano Mater.

Self Cite

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“…Kovscek et al were the first to introduce isoconversional kinetic models in ISC . Some researchers believe that improving oxidation in crude oil is due to catalytic effects of NPs, while the others state that NPs promote oxidation of adsorbed crude oils to asphaltenes through surface exposure , …”

Section: Introductionmentioning

confidence: 99%

Improving the Efficiency of the THAI-CAPRI Process by Nanocatalysts Originated from Rock Minerals

2018

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Toe-to-heel air injection method is a modified pattern in situ combustion which is applicable for the recovery of heavy oil reservoirs. A fixed bed of catalyst around the production well can improve performance and quality of the produced oil; however, pilot tests revealed rapid deactivation of the catalyst bed. Dispersion of fine catalyst particles (ideally nanoparticles) around the production well by carrier fluids may reduce the deactivation problem. In the first step of this study, three nanoparticles, namely calcite, montmorillonite (MMT), and Cloisite 20A, were dispersed in a heavy oil as candidate catalysts and subjected to simultaneous thermal analysis. Kinetic parameters of different reaction zones were obtained by the Coats and Redfern model, and it was observed that 0.5 wt % of the MMT more effectively catalyzed the combustion reactions. In the second step, selected sample was subjected to multiple heating rate experiments to study detailed kinetic effects. Results were analyzed by Vyazovkin isoconversional kinetic modeling, and mechanism of different steps was determined. Results showed that all reaction regions follow nucleation–growth models. It was found that low-temperature oxidation (LTO) reactions follow a power law model (n = 1/3) which means an acceleratory nucleation process. Nanoclay did not change the reactions mechanism of both fuel deposition (FD) and high-temperature oxidation (HTO) regions (both followed A3) but E 0 and A 0 in the FD step were increased from 187.3 ± 19.0 kJ/mol and 51.2 ± 3.4 min–1 to 235.0 ± 21.8 kJ/mol and 59.7 ± 3.3 min–1, respectively. In contrast to FD, Nanoclay decreased E 0 and A 0 of HTO from 100.1 ± 17.2 kJ/mol and 34.6 ± 2.1 min–1 to 81.3.0 ± 18.5 kJ/mol and 31.0 ± 2.3 min–1, respectively. In other words, MMT intensified LTO and catalyzed FD step and consequently altered the residual coke. It also decreased energy barriers and changed mass loss pattern of HTO which could be caused by change of reactant (coke) and resistance of MMT nucleation sites to heat in contrast to ingested nucleation sites of residual coke. Altogether, MMT improved LTO and prevented formation of excessive fuel; at the same time, MMT catalyzed HTO step and caused more uniform temperature profile which could sustain combustion.

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Comments on “Pyrolysates distribution and kinetics of Shenmu long flame coal” by Yuankui Lin et al. [Energy Convers. Manage. 86 (2014) 428–434]

Trache

2016

Energy Conversion and Management

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Inferring the role of NiO nanoparticles from the thermal behavior of virgin and adsorbed hydrocarbons

Cited by 13 publications

References 39 publications

Metal–Organic Framework-74 for Ultratrace Arsenic Removal from Water: Experimental and Density Functional Theory Studies

Metal–Organic Framework-74 for Ultratrace Arsenic Removal from Water: Experimental and Density Functional Theory Studies

Improving the Efficiency of the THAI-CAPRI Process by Nanocatalysts Originated from Rock Minerals

Comments on “Pyrolysates distribution and kinetics of Shenmu long flame coal” by Yuankui Lin et al. [Energy Convers. Manage. 86 (2014) 428–434]

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