Influence of preparation method on the adsorptive performance of silica sulfuric acid for the removal of gaseous o-xylene

Ma, Mengze; Gao, Kaiyin; Ma, Zhen; Ding, Jinchang

doi:10.1016/j.seppur.2021.118484

Cited by 9 publications

(8 citation statements)

References 38 publications

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“…Especially at 700 °C, the o -xylene breakthrough from the HIO bed remained unseen until 54 h, and the process curve was also different as compared to the curves acquired at lower temperatures ( Figure 2 b), thus, implying that HIO might have possessed super capacity (more than 691 mg g[Fe] −1 ) and unique reaction mechanism for removing o -xylene, which need to be studied further. Comparing Q B of HIO for removing o -xylene with other materials already reported in the literature [ 9 , 10 , 11 , 12 ], the value obtained here was higher.…”

Section: Resultssupporting

confidence: 40%

“…Therefore, the development of new technologies to prevent the VOC contamination is currently of significant interest [ 5 , 6 , 7 , 8 ]. Among these, the processes that can enable the achievement of VOC resource utilization are a key to move towards sustainability; thus, these have received an increasing attention in recent years [ 9 , 10 , 11 , 12 , 13 , 14 ]. Considering that the mainstream technologies for VOCs elimination such as catalytic oxidation and thermal combustion are based on VOCs oxidation reactions, it is suspected that VOCs have a potential as reducing agents in the iron-making process from iron oxide ores.…”

Section: Introductionmentioning

confidence: 99%

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Utilization of Hematite Particles for Economical Removal of o-xylene in a High-Temperature Gas-Solid Reactor

Zhao

Qian

et al. 2022

Molecules

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To establish a novel approach for VOCs resource utilization, coupled o-xylene oxidation and hematite reduction was investigated in this study in a high-temperature gas-solid reactor in the temperature range 300–700 °C. As the o-xylene-containing inert gas (N2) stream traveled through the hematite particle bed, its reaction behavior was determined in programmed heating and constant temperature modes. Consequently, the effect of bed temperature, flow rate and o-xylene inlet concentration on both o-xylene removal performance and degree of hematite reduction was studied. The raw hematite and solid products were analyzed by TGA, XRF, XRD and SEM-EDS. The results showed that a temperature above 300 °C was required to completely eliminate o-xylene by hematite, and both o-xylene removal capacity and degree of hematite reduction at 5% breakthrough points enhanced on increasing the temperature and decreasing the flow rate. The increment in temperature from 300 °C to 700 °C led to a gradual reduction of Fe2O3 to Fe3O4, FeO and metallic iron. Thus, this study provides a novel, economic and promising technology for treating the VOC pollutants.

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Section: Resultssupporting

confidence: 40%

Section: Introductionmentioning

confidence: 99%

Utilization of Hematite Particles for Economical Removal of o-xylene in a High-Temperature Gas-Solid Reactor

Zhao

Qian

et al. 2022

Molecules

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“…However, as can be seen from Figure 1 and Table 1 (the TG curves and the calculated amount of the P-and C-state H 2 SO 4 for the SSA(E)-4 and SSA(W)-4), the proportion of the C-state H 2 SO 4 in SSA(E)-4 was higher than that in SSA(W)-4, indicating that the features of the solvents affected the anchoring states of sulfuric acid in SG support. As suggested in our previous studies [22,23], the C-state H 2 SO 4 , defined as the chemically bonded sulfuric acid, was formed by the condensation of silanol groups of SG surface and sulfuric acid molecules, and it was higher than the P-state counterpart (defined as the physisorbed sulfuric acid) in the bond strength. It was speculated that the use of ethyl acetate as the impregnation medium might promote the condensation of silanol groups and H 2 SO 4 molecules since it is a weakly polar solvent (dipole moment µ = 4.40, dielectric constant ε = 6.02) without hydroxyl groups compared with water (µ = 1.84, ε = 80.10) [24].…”

Section: Loading Amount and Anchoring States Of Sulfuric Acid In The ...mentioning

confidence: 60%

“…It was confirmed that the process was achieved by the sulfonation reaction of o-xylene on silica sulfuric acid (SSA) [21]; thus, the preparation procedure of SSA may have an important effect on the adsorptive performance. In a previous study [22], the silica supported sulfuric acid (SSAI) prepared by sol-gel processing was compared with the SSAII prepared by the impregnation method. The results showed that SSAI exhibited a higher breakthrough adsorption capacity as compared to SSAII, which contributed to a greater proportion of C-state sulfuric acid on the SSA surface.…”

Section: Introductionmentioning

confidence: 99%

Influence of Impregnation Medium on the Adsorptive Performance of Silica Sulfuric Acid for the Removal of Gaseous o-Xylene: Comparison on Ethyl Acetate and Water

Zhao

Ma²,

Qian³

et al. 2022

Catalysts

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Silica supported sulfuric acid (SSA) has been demonstrated to be capable of effectively removing phenyl VOCs through the reaction-type adsorption mechanism. The effects of the solvent (water, ethyl acetate) used to impregnate silica gel with H2SO4 solution in order to prepare SSA adsorbents have been studied. As-prepared two series SSA(E)-x and SSA(W)-x materials (x = 1, 2, 3, 4) were characterized by TG, SEM/EDS and N2 adsorption/desorption techniques, and their breakthrough adsorption performances were evaluated from experimental and theoretical aspects. The results showed that the H2SO4 loading amounts were 2.8, 4.0, 4.8 and 5.6 mmol g−1 respectively for both SSA(E)-x and SSA(W)-x when x equaled 1, 2, 3, 4. Among them, SSA(E)-4 was found to have a higher proportion of the C-state H2SO4 than SSA(W)-4. Both SSA(E)-x and SSA(W)-x exhibited significant removal capacity of gaseous o-xylene. The reactive temperature regions were determined to be 120–170 °C for SSA(E)-4 and 120–160 °C for SSA(W)-4 with a common optimum point of 160 °C. Both SSA(E)-x and SSA(W)-x adsorbents exhibited excellent recyclability and reuse performance. Further, the series SSA(E)-x materials outperformed the series SSA(W)-x on all adsorption performance metrics, suggesting that ethyl acetate is a preferred solvent for preparing the SSA materials in phenyl VOCs removal application.

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“…The removal performance and transformation products of target pollutants is most probably linked to their molecular structures. However, only the o-xylene results have been reported to date [17][18][19]. Supported adsorbents that have been tested include silicasupported sulfuric acid (SSSA) [16], synthetic silica-supported sulfuric acids (SSAI and SSAII) [19], and mesoporous MCM-41-and SBA-15-supported sulfuric acids (SSA/MCM-41 and SSA/SBA-15) [17].…”

Section: Introductionmentioning

confidence: 99%

Reactive Adsorption of Gaseous Anisole by MCM–41-Supported Sulfuric Acid

et al. 2022

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To achieve the efficient resource treatment of aromatic volatile organic compounds (VOCs) of high toxicity, this work chose anisole as a representative pollutant and investigated its removal by an MCM–41-supported sulfuric acid (SSA/MCM–41) adsorbent. The results indicate that the SSA/MCM–41 adsorbent exhibited a reactive temperature range of 110–140 °C, in which the anisole removal ratio (Xa) was greater than 95%. The collected breakthrough adsorption data fit the dose–response model. In the comprehensive analysis of the process conditions, reducing the flow rate enhanced the theoretical breakthrough time and adsorption capacity (tB,th and QB,th), while reducing the inlet concentration or raising the bed height resulted in a first increasing and then slightly decreasing trend in the QB,th. As a result, the highest tB,th and QB,th were 73.82 min and 247.56 mg g−1, respectively. The FTIR and 1H/13C NMR results demonstrate that the adsorbed products included both 4-methoxybenzenesulfonic acid and 1-methoxy-4-(4-methoxyphenyl)sulfonylbenzene. Accordingly, the mechanism of reactive adsorption was proposed. Meanwhile, the spent SSA/MCM–41 could be desorbed and regenerated for cyclic reuse. It is believed that the results obtained will assist in promoting the application of the novel gas–solid adsorption approach in VOC treatment.

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Influence of preparation method on the adsorptive performance of silica sulfuric acid for the removal of gaseous o-xylene

Cited by 9 publications

References 38 publications

Utilization of Hematite Particles for Economical Removal of o-xylene in a High-Temperature Gas-Solid Reactor

Utilization of Hematite Particles for Economical Removal of o-xylene in a High-Temperature Gas-Solid Reactor

Influence of Impregnation Medium on the Adsorptive Performance of Silica Sulfuric Acid for the Removal of Gaseous o-Xylene: Comparison on Ethyl Acetate and Water

Reactive Adsorption of Gaseous Anisole by MCM–41-Supported Sulfuric Acid

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