Roles of texture and acidity of acid-activated sepiolite catalysts in gas-phase catalytic dehydration of glycerol to acrolein

Zhou, Chun Hui; Li, Gui Li; Zhuang, Xiao Yu; Wang, Peng Peng; Tong, Dong Shen; Yang, Hui; Lin, Chun Xiang; Li, Li; Zhang, Hao; Ji, Sheng Fu; Yu, Wei

doi:10.1016/j.mcat.2016.12.022

Cited by 39 publications

(13 citation statements)

References 50 publications

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“…Thereby the dye ions were desorbed into the solution. However, the HCl caused the collapse of the sepiolite crystal structure with the high H + concentration [27]. The number of regenerations may reflect the utilize cost of an adsorbent.…”

Section: Resultsmentioning

confidence: 99%

Adsorption of Malachite Green with Sodium Dodecylbenzene Sulfonate Modified Sepiolite: Characterization, Adsorption Performance and Regeneration

Zhang

Liu

2019

IJERPH

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The adsorption of malachite green (MG) onto sodium dodecylbenzene sulfonate (SDBS)-modified sepiolite was investigated with respect to pH, oscillation rate, MG dosage and adsorbent dosage. The modification condition and modified sepiolite characterization were examined. The conditions of 100% cation exchange capacity (CEC), pH value of 9, contact time of 60 min and 25 °C were deemed as the optimal conditions. The interlayer spacing of sepiolite was expanded and the surface hydrophobicity improved due to the entering of SDBS into the interlayer structure of the sepiolite ore. This is probably the reason for its adsorption enhancement. The adsorption of malachite green by organic sepiolite is in line with the quasi-secondary kinetic model. The results from the regeneration procedure suggest that a superior regeneration property obtained with 0.2 mol/L HCl concentration.

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Section: Resultsmentioning

confidence: 99%

Adsorption of Malachite Green with Sodium Dodecylbenzene Sulfonate Modified Sepiolite: Characterization, Adsorption Performance and Regeneration

Zhang

Liu

2019

IJERPH

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“…The maximum S BET obtained from the experimental runs was 450.97 m 2 /g while the minimum CEC was 6.79 meq/100 g at 80°C, 10%, 5 N, 3 h, and 100 rpm for temperature, solid rate, acid concentration, activation time, and mixing rate, respectively (Table 3). The high value of the S BET obtained could be as a result of the exposure of more surfaces during the acid activation process [45]. Through Fig.…”

Section: Verification Of the Optimum Predicted Modelmentioning

confidence: 87%

Modelling and Optimization of Sepiolite Activation with Citric Acid Using Factorial Experimental Design and Response Surface Methodology

Yonar

Ugwu

Sabah

2020

Silicon

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In this study, the effects of several parameters such as the acid concentration, mixing time, temperature, solid rate, and mixing rate on the specific surface area (BET) and cation exchange capacity (CEC) of sepiolite activated by citric acid were investigated using factorial experimental design and response surface methodology. While the specific surface area and cation exchange capacity of nitric acid activated sepiolite were chosen as the responses, the acid concentration, time, temperature, solid rate, and mixing rate were the process parameters. The relationship between the process parameters and the responses was obtained and used in the determination of the optimal conditions. The result showed that the specific surface area and cation exchange capacity of the acid-activated sepiolite were strongly affected by the process parameters. The optimal conditions for achieving the maximum specific surface area and minimum cation exchange capacity were 95.73°C, 8.64%, 4.99 N, 1 h, and 450 rpm for temperature, solid rate, acid concentration, activation time, and the mixing rate, respectively. The experimental and predicted values for the S BET and the CEC were obtained as 450.97 m 2 /g and 449.97 m 2 /g, and 6.79 meq/100 g and 6.86 meq/100 g, respectively. The results obtained from this study clearly indicated that the actual values were in good conformity with the predicted values as evidenced by small errors of 1.00% and 0.07% for the S BET and CEC, respectively. As a result, the S BET and CEC of the Sep activated by citric acid were strongly affected by the process parameters, especially the solid rate for the S BET and the temperature for CEC. It was found that citric-acid activated Sep had a S BET approximately 2.5 times higher than that of the untreated Sep while the CEC of Sep may be strongly eliminated by citric acid treatment. Thus, the mineral structure was progressively transformed into amorphous silica coming from the tetrahedral sheet of the generated fibrous silicates, whose S BET was larger than that of the raw Sep.

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“…Sep framework, and then, the Sep could convert to porous silica [33]. In this research, part of Fe 3+ is incorporated into the magnesium vacancies of Sep to form variety of stable metalliccontaining Sep [34,35].…”

Section: Advances In Polymer Technologymentioning

confidence: 99%

Effect of Sepiolite-Loaded Fe2O3 on Flame Retardancy of Waterborne Polyurethane

Qian

et al. 2021

Advances in Polymer Technology

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In this study, a kind of inorganic composite flame retardant (Sep@Fe2O3) was prepared by combining solution deposition and calcination methods using sepiolite microfiber material as carrier. This inorganic compound flame retardant was combined with waterborne polyurethane (WPU) through layer-by-layer method to prepare WPU composites. The SEM and EDS, TEM, and XRD were used to characterize the microscopic morphology and crystal structure of WPU composites. Thermogravimetric analysis tests confirmed the good thermal stability of WPU/Sep@Fe2O3 composites; at the temperature of 600°C, the carbon residual percentage of WPU/Sep, WPU/Fe2O3, and WPU/Sep@Fe2O3 composites is 7.3%, 12.2%, and 13.4%, respectively, higher than that of WPU (1.4%). Vertical combustion tests proved better flame-retardant property of WPU/Sep@Fe2O3 composite-coated cotton than noncoated cotton. The microcalorimeter test proved that the PHRR of WPU/Sep@Fe2O3 composites decreased by 61% compared with that of WPU. In addition, after combining with Sep@Fe2O3, the breaking strength of WPU increased by 35%.

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Roles of texture and acidity of acid-activated sepiolite catalysts in gas-phase catalytic dehydration of glycerol to acrolein

Cited by 39 publications

References 50 publications

Adsorption of Malachite Green with Sodium Dodecylbenzene Sulfonate Modified Sepiolite: Characterization, Adsorption Performance and Regeneration

Adsorption of Malachite Green with Sodium Dodecylbenzene Sulfonate Modified Sepiolite: Characterization, Adsorption Performance and Regeneration

Modelling and Optimization of Sepiolite Activation with Citric Acid Using Factorial Experimental Design and Response Surface Methodology

Effect of Sepiolite-Loaded Fe2O3 on Flame Retardancy of Waterborne Polyurethane

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