Dimethyl ether from methanol on mesoporous γ-alumina catalyst prepared from surfactant free highly porous pseudo-boehmite

Dehkordi, Seyedeh Afagh Hashemi; Golbodaqi, Mojtaba; Mortazavi-Manesh, Anahita; Safari, Nasser; Bahadoran, Farzad; Haghighat, Mohammad Fatehi

doi:10.1016/j.mcat.2023.113004

Cited by 3 publications

(3 citation statements)

References 35 publications

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Section: Resultsmentioning

confidence: 99%

“…Figure 4 shows that SG and nanofluid SG + SiO 2 _120 solutions exhibited a shear thinning behavior with pseudo-plasticity indices (n) less than one [59], where hydroxyl groups over silica nanoparticles surface could contribute to improving the interactions with OH groups around the rod-like structure of the Scleroglucan [60]. In this study, it is also observed that nanoparticles SiO2_120 and SiO2_APTES_120, spherical with average sizes of 20 nm and a superficial area of 120 m 2 /g, are present in the solutions with higher viscosity.…”

Section: Rheological Behavior Of Nanofluidmentioning

confidence: 99%

“…Figure 4 shows that SG and nanofluid SG + SiO2_120 solutions exhibited a shear thinning behavior with pseudo-plasticity indices (n) less than one [59], where hydroxyl groups over silica nanoparticles surface could contribute to improving the interactions with OH groups around the rod-like structure of the Scleroglucan [60]. For a rheological explanation of the increase in bulk viscosity with the addition of the nanofluid prepared by method II, the rheological parameters of the Carreau-Yasuda model, such as relaxation time, viscoelasticity index, and viscosity at zero and infinite time, are essential to establishing the nanoparticle effect.…”

Section: Rheological Behavior Of Nanofluidmentioning

confidence: 99%

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Experimental Investigation of the Viscosity and Stability of Scleroglucan-Based Nanofluids for Enhanced Oil Recovery

Castro,

Corredor,

Llanos

et al. 2024

Nanomaterials

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Biopolymers emerge as promising candidates for enhanced oil recovery (EOR) applications due to their molecular structures, which exhibit better stability than polyacrylamides under harsh conditions. Nonetheless, biopolymers are susceptible to oxidation and biological degradation. Biopolymers reinforced with nanoparticles could be a potential solution to the issue. The nanofluids’ stability and performance depend on the nanoparticles’ properties and the preparation method. The primary objective of this study was to evaluate the effect of the preparation method and the nanoparticle type (SiO2, Al2O3, and TiO2) on the viscosity and stability of the scleroglucan (SG). The thickening effect of the SG solution was improved by adding all NPs due to the formation of three-dimensional structures between the NPs and the SG chains. The stability test showed that the SG + Al2O3 and SG + TiO2 nanofluids are highly unstable, but the SG + SiO2 nanofluids are highly stable (regardless of the preparation method). According to the ANOVA results, the preparation method and standing time influence the nanofluid viscosity with a statistical significance of 95%. On the contrary, the heating temperature and NP type are insignificant. Finally, the nanofluid with the best performance was 1000 ppm of SG + 100 ppm of SiO2_120 NPs prepared by method II.

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Section: Resultsmentioning

confidence: 99%

Section: Rheological Behavior Of Nanofluidmentioning

confidence: 99%

“…Figure 4 shows that SG and nanofluid SG + SiO2_120 solutions exhibited a shear thinning behavior with pseudo-plasticity indices (n) less than one [59], where hydroxyl groups over silica nanoparticles surface could contribute to improving the interactions with OH groups around the rod-like structure of the Scleroglucan [60]. For a rheological explanation of the increase in bulk viscosity with the addition of the nanofluid prepared by method II, the rheological parameters of the Carreau-Yasuda model, such as relaxation time, viscoelasticity index, and viscosity at zero and infinite time, are essential to establishing the nanoparticle effect.…”

Section: Rheological Behavior Of Nanofluidmentioning

confidence: 99%

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