Regeneration of the Midrex Reformer Catalysts Using Supercritical Carbon Dioxide

Sadatshojaei, Erfan; Esmaeilzadeh, Feridun; Fathikaljahi, J.; Barzi, Seyed Esmaeil Hosseynian; Wood, David A.

doi:10.1016/j.cej.2018.02.038

Cited by 34 publications

(5 citation statements)

References 23 publications

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“…In the literature, several regeneration procedures were suggested, such as microwave irradiation, bio-regeneration, supercritical regeneration, chemical extraction, thermal treatment, etc. [17,45,[57][58][59]. The thermal regeneration used in the present work was similar to that discussed in our previous work [45].…”

Section: Regeneration Efficiencymentioning

confidence: 61%

Iron Molybdate Fe2(MoO4)3 Nanoparticles: Efficient Sorbent for Methylene Blue Dye Removal from Aqueous Solutions

et al. 2020

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The present study investigated iron molybdate (Fe2(MoO4)3), synthesized via a simple method, as a nanosorbent for methylene blue (MB) dye removal from aqueous solutions. Investigations of the effects of several parameters like contact time, adsorbent dose, initial dye concentration, temperature and pH were carried out. The results showed that MB removal was affected, significantly, by adsorbent dose and pH. Interestingly, lower values of adsorbent dose resulted in the removal of higher amounts of MB. At the optimum pH, the removal efficiency of 99% was gained with an initial MB concentration of ≤60 ppm. The kinetic study specified an excellent correlation of the experimental results with the pseudo-second-order kinetics model. Thermodynamic studies proved a spontaneous, favorable and endothermic removal. The maximum amount of removal capacity of MB dye was 6173 mg/g, which was determined from the Langmuir model. The removal efficiency was shown to be retained after three cycles of reuse, as proven by thermal regeneration tests. The presence and adsorption of the dye onto the Fe2(MoO4)3 nanoparticle surface, as well as the regeneration of the latter, was ascertained by scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FTIR). These findings are indicative that the investigated nanosorbent is an excellent candidate for the removal of MB in wastewater.

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Section: Regeneration Efficiencymentioning

confidence: 61%

Iron Molybdate Fe2(MoO4)3 Nanoparticles: Efficient Sorbent for Methylene Blue Dye Removal from Aqueous Solutions

et al. 2020

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“…Regeneration techniques suggested in the literature include chemical extraction, thermal treatment, supercritical regeneration, microwave irradiation, bio-regeneration, etc. [ 25 , 88 , 93 , 94 , 95 ]. The thermal regeneration, which has been applied for molybdenum oxide nanosorbent, was described in our previously published work [ 88 ].…”

Section: Resultsmentioning

confidence: 99%

Highly Efficient Methylene Blue Dye Removal by Nickel Molybdate Nanosorbent

et al. 2021

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Removing methylene blue (MB) dye from aqueous solutions was examined by the use of nickel molybdate (α-NiMoO4) as an adsorbent produced by an uncomplicated, rapid, and cost-effective method. Different results were produced by varying different parameters such as the pH, the adsorbent dose, the temperature, the contact time, and the initial dye concentration. Adsorbent dose and pH had a major removal effect on MB. Interestingly, a lower amount of adsorbent dose caused greater MB removal. The amount of removal gained was efficient and reached a 99% level with an initial methylene blue solution concentration of ≤160 ppm at pH 11. The kinetic studies indicated that the pseudo-second-order kinetic model relates very well with that of the obtained experimental results. The thermodynamic studies showed that removing the MB dye was favorable, spontaneous, and endothermic. Impressively, the highest quantity of removal amount of MB dye was 16,863 mg/g, as shown by the Langmuir model. The thermal regeneration tests revealed that the efficiency of removing MB (11,608 mg/g) was retained following three continuous rounds of recycled adsorbents. Adsorption of MB onto α-NiMoO4 nanoparticles and its regeneration were confirmed by Fourier transform infrared spectroscopy (FTIR) analysis and scanning electron microscopy (SEM) analysis. The results indicated that α-NiMoO4 nanosorbent is an outstanding and strong candidate that can be used for removing the maximum capacity of MB dye in wastewater.

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“…This is because the conversion efficiency of artificial photosynthesis reactions remains low. Progress in the miscellaneous fields such as catalysis [6], materials sciences and nanotechnology must be made to improve the efficiency of artificial photosynthesis reactions. Research associated with artificial photosynthesis is ongoing due to the environmental desirability to find cost-effective solutions and technology breakthroughs are likely.…”

Section: The Expectation Of Artificial Photosynthesis To Produce Useful Fuelsmentioning

confidence: 99%

“…The primary aim of seeking and exploiting new technologies is to enhance prosperity while improving the quality of human life. For instance, new technologies that enhance energy resource recovery [1][2][3][4][5][6] and /or improve efficiency in a sustainable manner constitute beneficial advances for human existence. The diverse and rapid development of innovative technologies associated with the exploitation of solar energy has the potential to provide a significant environmentally friendly and sustainable portion of future energy supply.…”

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confidence: 99%

Solar Energy and its Multiple Applications

Wood

2021

Materials Research Foundations

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Solar energy is commercially exploited to provide benefits in the form of various products and capabilities applying a range of technologies. Electricity generation is achieved either directly from photovoltaic cells made of various materials or indirectly through the steam production from concentrating solar thermal systems. Whereas solar thermal power generation requires large scale plants, photovoltaic systems can be large or small in scale and building integrated, if required. Both types of generation can be standalone or connected to power grids. Solar energy is also extensively used for water and space heating, cooling and drying purposes. It can also be stored and/or transformed into a range of clean fuels and contributes energy to the manufacture of various energy-intensive products. The research into the artificial photosynthetic synthesis of biofuels although encouraging is, however, yet to be achieved commercially exploited on a large scale. Much scope remains for innovative technology breakthroughs to further improve the efficiency and uptake of all the solar energy technologies currently exploited or under investigation. Policy frameworks, renewable portfolio standards, feed-in tariffs and net-metering play an important and ongoing role in promoting the uptake of photovoltaics in particular.

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Regeneration of the Midrex Reformer Catalysts Using Supercritical Carbon Dioxide

Cited by 34 publications

References 23 publications

Iron Molybdate Fe2(MoO4)3 Nanoparticles: Efficient Sorbent for Methylene Blue Dye Removal from Aqueous Solutions

Iron Molybdate Fe2(MoO4)3 Nanoparticles: Efficient Sorbent for Methylene Blue Dye Removal from Aqueous Solutions

Highly Efficient Methylene Blue Dye Removal by Nickel Molybdate Nanosorbent

Solar Energy and its Multiple Applications

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