Gas Phase Oligomerization of Isobutene over Acid Treated Kaolinite Clay Catalyst

Al-Dhayan, D. M.; Aouissi, Ahmed

doi:10.9767/bcrec.12.1.758.119-126

Cited by 6 publications

(5 citation statements)

References 32 publications

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“…TGA profile of processed clay show weight loss due the removal of the physisorbed water (below 100 °C), loss of the strongly bonded water molecules existing in the first coordination sphere of the interlayer ions (100–500 °C) and the loss of structural hydroxyl groups (500–900 °C) [45] . TGA analysis of palladium intercalated catalyst revealed that catalysts with higher metal loadings (Pd 6 wt % and Pd 10 wt %), were stable up to 900 °C with slight initial weight reduction, which could be ascribed to loss of water molecules [46] . However, the significant weight loss was observed with less metal loading particularly for Pd 2 % and Pd 4 %, which indicates that catalyst with higher metal loadings are more thermally stable.…”

Section: Resultsmentioning

confidence: 96%

“…[45] TGA analysis of palladium intercalated catalyst revealed that catalysts with higher metal loadings (Pd 6 wt % and Pd 10 wt %), were stable up to 900°C with slight initial weight reduction, which could be ascribed to loss of water molecules. [46] However, the significant weight loss was observed with less metal loading particularly for Pd 2 % and Pd 4 %, which indicates that catalyst with higher metal loadings are more thermally stable. The maximum weight loss (%) was observed in 4 wt % Pd/Clay probably owing to the weakening of bonds in the clay in this case.…”

Section: Resultsmentioning

confidence: 97%

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A Sustainable Palladium‐Intercalated Montmorillonite Clay Catalytic System for Imine Hydrogenation under Mild Conditions

2020

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A series of palladium nanoparticles (Pd NPs) intercalated montmorillonite clay catalysts is reported for hydrogenation of 3-diphenyl prop-2-en-1-imine under mild reaction conditions. Pd/clay catalyst was prepared by a simple wet-impregnation method, and the physicochemical properties were characterized extensively by various techniques including N 2 adsorption, XRD, TEM, XPS and TPR etc., which showed the intercalation of active Pd NPs between the clay layers. The effect of reaction conditions such as catalyst loading, reaction time, temperature and H 2 pressure is explored, and thereby a plausible mechanism is proposed. The optimum amount of 6 wt % Pd/clay catalyst showed significant catalytic activity to yield 3-phenyl propyl aniline with 100 % conversion and selectivity under 5 bar pressure and a shorter reaction period of 3.5 h at 100°C. The developed catalytic system unveiled excellent reusability over five cycles and hence paved the way for industrial applications.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 97%

A Sustainable Palladium‐Intercalated Montmorillonite Clay Catalytic System for Imine Hydrogenation under Mild Conditions

2020

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“…Three small peaks at 789, 755 and 696 cm -1 correspond to Si-O-Al vibrations and to OH groups perpendicular to the surface [29]. Lastly, the bands at 538 cm -1 (Si-O-Al deformation), 469 cm -1 (Si-O bending), 429 cm -1 (Si-O-Si bending) are typical of kaolinite clay mineral [24,30].…”

Section: Microstructure Of the Synthesized Materialsmentioning

confidence: 91%

“…In Fig. 2a, the kaolin clay exhibits bands at 3697 cm -1 corresponding to valence vibrations of surface hydroxyl clusters (OH stretching) [24], and 3620 cm -1 corresponding to the vibrations of the internal hydroxyl cluster (OH stretch) [25,26]. The band located at 3454 cm -1 characterizes silanol group (Si-O-H).…”

Section: Microstructure Of the Synthesized Materialsmentioning

confidence: 99%

Synthesis of Ordered Mesoporous Carbon from Vietnam Natural Kaolin Clay for Supercapacitor Application

Chu

Ngo

Hằng

2020

MSF

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In nature, kaolin clay is referred to a readily available cheap source of silicon and used in various fields such as the paper, ceramic, paint, plastic, rubber, and cracking catalyst industries. This paper introduces utilization of natural kaolin clay for a new application. In particular, the kaolin clay is used as a new raw material for synthesis of ordered mesoporous carbon (OMC) materials, which serve as electrode active materials for supercapacitors. Kaoline used in the present work is originated from Yen Bai province (Vietnam). After subjected several steps of the treatment process, silica present in the kaolin clay is converted to sodium silicate and used directly as a source of silicon for the synthesis process of mesoporous porous silica (SBA-15). The synthesized SBA-15 mesoporous silicas exhibit rod-like nanostructure with the specific area of 432.7 m2 g-1 and the mean pore size of 7-8 nm. Subsequently, SBA-15 silica serves as hard template for preparation of OMCs by using nanocasting method. The OMCs carbonized at different temperatures in the absence and presence of boric acid reveal highly ordered mesoporous structure with the highest specific area of 1039.2 m2 g-1 and the mean pore size ranging from 6 to 7 nm. As used as electrode active material in 6 M KOH aqueous solution, the resultant OMCs exhibit excellent capacitive performance with a specific capacitance higher than 80 F g-1 at a scan rate of 5 mV s-1. The obtained results show that, in addition to the high specific area, the electrical conductivity also plays an important role in enhancing energy storage ability of the OMC electrodes. At the same carbonization temperature, the high surface area plays crucial role. However, at the higher carbonization temperatures, effect of the electrical conductivity of the materials prevails over the high surface area. This study illustrates highly application feasibility of Vietnam natural kaolin clay as available and cheap raw material source for synthesis of electrode active materials with the high supercapacitive performance for electrochemical double layer capacitors.

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“…3. Upon investigating the IR spectrum of clay, some significant peaks that lie at the range 500-550 cm −1 are assigned for Si-O-Al and Si-O-Si [65,66]. Other important peaks appear in the range 3200-3300 cm −1 .…”

Section: Ir Characterization Of the Hydrogel Nanocompositesmentioning

confidence: 99%

“Gamma Irradiation Synthesis of Carboxymethyl Chitosan-Nanoclay Hydrogel for the Removal of Cr(VI) and Pb(II) from Aqueous Media”

Abdel-Raouf

Kamal

Hegazy

et al. 2023

J Inorg Organomet Polym

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Hydrogel composites comprised of N,O carboxymethyl chitosan crosslinked with different weight ratios of acrylic acid and fabricated with nanoclay particle were prepared via gamma irradiation at 25 kGy irradiation dose. The prepared composites were coded as CsAA1Cl, CsAA2Cl and CsAA3Cl based on the weight ratio of acrylic acid to the chitosan derivative. The claimed hydrogels were characterized by FTIR, TGA and XRD. The TGA data implied that the incorporation of clay nanoparticles enhanced the thermal stability of the composites; the decomposition temperature increased up to 500 °C for CsAA3Cl. Three AFM outcomes were used to compare the surface features of the samples; topography, height and surface roughness. The topography data reveals that the nanoclay particles incorporated in CsAA3Cl are intercalated and exfoliated. Then, the optimized sorbent (CsAA3Cl) was investigated as green sorbents for chromium (VI) and lead (II). The data revealed that CsAA3Cl displayed maximum removal performance towards both lead and chromium with removal efficiencies 125 mg/g and 205 mg/g respectively at the optimum application conditions within 90 min only. Also, it was found that the optimum pH value was 9 for chromium and 8 for lead. The data proved that the adsorption of both cations followed pseudo-first order kinetic model. The prepared composites showed acceptable metal uptake capacity at three successive cycles. Graphical Abstract

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Gas Phase Oligomerization of Isobutene over Acid Treated Kaolinite Clay Catalyst

Cited by 6 publications

References 32 publications

A Sustainable Palladium‐Intercalated Montmorillonite Clay Catalytic System for Imine Hydrogenation under Mild Conditions

A Sustainable Palladium‐Intercalated Montmorillonite Clay Catalytic System for Imine Hydrogenation under Mild Conditions

Synthesis of Ordered Mesoporous Carbon from Vietnam Natural Kaolin Clay for Supercapacitor Application

“Gamma Irradiation Synthesis of Carboxymethyl Chitosan-Nanoclay Hydrogel for the Removal of Cr(VI) and Pb(II) from Aqueous Media”

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