The effects of ammonium sulfate and sulfamic acid on the surface acidity of sulfated zirconia

Ren, Kaiqing; Kong, Decun; Meng, Xuan; Wang, Xin; Shi, Li; Liu, Naiwang

doi:10.1016/j.jscs.2018.06.006

Cited by 14 publications

(11 citation statements)

References 35 publications

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“…Similarly, according to the ASTM D 2710‐92 standard, the olefin content of the feed and product stream was determined 7,55,56 . A known mass of the sample dissolved in a specified solvent was titrated with standard bromide‐bromate solution.…”

Section: Methodsmentioning

confidence: 99%

“…Similarly, according to the ASTM D 2710-92 standard, the olefin content of the feed and product stream was determined. 7,55,56 A known mass of the sample dissolved in a specified solvent was titrated with standard bromide-bromate solution. The end point is indicated by a dead stop electrometric titration apparatus when the presence of free bromine causes a sudden change in the electrical conductivity of the system.…”

Section: Characterization and Instrumentationmentioning

confidence: 99%

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Optimizing temperature and introducing new process arrangements for elevating clay's longevity based on the known poisons in the separation process of trace olefins from aromatics

Rouhani

Farhadi

Kenari

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND The clay treatment widely utilized to reduce unsaturated components in aromatic stream has a detrimental effect on catalyst lifetime. Due to the short lifetime of commercial clay, a huge number of studies have been carried out to address this problem over the last decade. This study aims to optimize the temperature for longer serviceability of clay by removal of unsaturated aliphatic components from aromatic streams through the adsorption and catalytic properties of clay. A novel process arrangement is introduced by scheduling the reuse of deactivated clay that is discarded after deactivation. RESULTS Results showed that the suitable range of temperature for olefin removal is 155–205 °C, and the optimum temperature with the lowest operational cost was 185 °C, which is then gradually elevated to 205 °C. CONCLUSION The new process arrangements utilize these results and elevate clay's lifetime by almost 3.5 times, leading to an economical solution on an industrial scale. © 2021 Society of Chemical Industry (SCI).

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Section: Methodsmentioning

confidence: 99%

Section: Characterization and Instrumentationmentioning

confidence: 99%

Optimizing temperature and introducing new process arrangements for elevating clay's longevity based on the known poisons in the separation process of trace olefins from aromatics

Rouhani

Farhadi

Kenari

et al. 2021

J of Chemical Tech & Biotech

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“…2− ions at 600-1000 • C affected the structural changes of ZrO 2 -SO 4 , causing a decrease in catalytic activity [64]. The decomposition of H 2 SO 4 occurs through a two-stage endothermic process at high temperatures according to Equations ( 1) and ( 2).…”

Section: Thermal Stability Characterization With Tg/dtamentioning

confidence: 99%

Recent Progress on Sulfated Nanozirconia as a Solid Acid Catalyst in the Hydrocracking Reaction

et al. 2022

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Zirconia has advantageous thermal stability and acid–base properties. The acidity character of ZrO2 can be enhanced through the sulfation process forming sulfated zirconia (ZrO2-SO4). An acidity test of the catalyst produced proved that the sulfate loading succeeded in increasing the acidity of ZrO2 as confirmed by the presence of characteristic absorptions of the sulfate group from the FTIR spectra of the catalyst. The ZrO2-SO4 catalyst can be further modified with transition metals, such as Platinum (Pt), Chromium (Cr), and Nickel (Ni) to increase catalytic activity and catalyst stability. It was observed that variations in the concentrations of Pt, Cr, and Ni produced a strong influence on the catalytic activity as the acidity and porosity of the catalyst increased with their addition. The activity, selectivity, and catalytic stability tests of Pt/ZrO2-SO4, Cr/ZrO2-SO4 and Ni/ZrO2-SO4 were carried out with their application in the hydrocracking reaction to produce liquid fuel. The percentage of liquid fractions produced using these catalysts were higher than the fraction produced using pure ZrO2 and ZrO2-SO4 catalyst.

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“…The result is corroborated by the band found at 1487 cm À1 , which is associated with both Brønsted and Lewis acid sites. [36][37][38] Furthermore, the total surface acidity of CRH, determined by Boehm titration, was 5.9 AE 0.2 mmol g À1 of H + . From the sum, the quantities of carboxylic, phenolic, and lactonic groups correspond to proximally 5.3, 0.3, and 0.3 mmol g À1 of H + , respectively.…”

Section: Characterization Of Catalystsmentioning

confidence: 99%

Sulfonated carbons from agro-industrial residues: simple and efficient catalysts for the Biginelli reaction

et al. 2022

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The effects of ammonium sulfate and sulfamic acid on the surface acidity of sulfated zirconia

Cited by 14 publications

References 35 publications

Optimizing temperature and introducing new process arrangements for elevating clay's longevity based on the known poisons in the separation process of trace olefins from aromatics

Optimizing temperature and introducing new process arrangements for elevating clay's longevity based on the known poisons in the separation process of trace olefins from aromatics

Recent Progress on Sulfated Nanozirconia as a Solid Acid Catalyst in the Hydrocracking Reaction

Sulfonated carbons from agro-industrial residues: simple and efficient catalysts for the Biginelli reaction

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