Synthesis, characterization and catalytic behavior of a zinc acetate complex immobilized on silica-gel

Nava, R.; Halachev, T.; Rodrı́guez, Rogelio; Castaño, V. M.

doi:10.1016/s0926-860x(02)00072-8

Cited by 18 publications

(10 citation statements)

References 38 publications

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“…No peaks can be observed in the complexed samples except in sample F, where the peaks appearing at 12.8˚, 19.9˚ and 33.9˚ reveal the presence of a mixed phase of ZnA. These peaks are typical of zinc acetate [15]. From these results, it can be concluded that the complexed films tend to have certain similarities and subsist in the amorphous rather than the crystalline phase.…”

Section: Resultsmentioning

confidence: 78%

“…In contrast, a number of sharp peaks located at 12. [15]. No peaks can be observed in the complexed samples except in sample F, where the peaks appearing at 12.8˚, 19.9˚ and 33.9˚ reveal the presence of a mixed phase of ZnA.…”

Section: Resultsmentioning

confidence: 91%

“…The peak intensity decreases as the amount of ZnA used in the PAA increases. The bands at 1442 and 1553 cm −1 have been assigned to symmetric and asymmetric stretches of the carboxylate ion in ZnA [15]. The peaks at 3342 and 1656 cm −1 for the pure PAA represent the N-H groups of polyacrylamide and the carbonyl group, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Poly(Acrylamide-Co-Acrylic Acid)-Zinc Acetate Polymer Electrolytes: Studies Based on Structural and Morphology and Electrical Spectroscopy

Hassan¹,

Yusof²

2014

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Solid polymer electrolytes (SPEs) of polyacrylamide-co-acrylic acid (PAA) as the polymer host and zinc acetate (ZnA) as an ionic dopant were prepared using a single solvent by the solution casting technique. The amorphous and crystalline structures of film were investigated by X-ray diffraction (XRD). The surface morphology of samples was examined by scanning electron microscopy (SEM). The composition and complex formation of films were characterized by Fourier transform infrared (FTIR) spectroscopy. The conductivity of the PAA-ZnA films was determined by electrochemical impedance spectroscopy. According to the XRD and FTIR analyses, all electrolyte films were in amorphous state and the existence of interaction between Zn 2+ cations and the PAA structure confirms that the film was successfully prepared. The SEM observations reveal that the electrolyte films appeared to be rough and flat with irregularly shaped surfaces. The highest ionic conductivity (σ) of 1.82 × 10 − 5 Scm −1 was achieved at room temperature (303 K) for the sample containing 10 wt % ZnA.

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Section: Resultsmentioning

confidence: 78%

Section: Resultsmentioning

confidence: 91%

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Poly(Acrylamide-Co-Acrylic Acid)-Zinc Acetate Polymer Electrolytes: Studies Based on Structural and Morphology and Electrical Spectroscopy

Hassan¹,

Yusof²

2014

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“…The heterogeneous catalyst was prepared by coating zinc ethanoate over silica gel (ZnA/SG) using a sol–gel technique. The preparation method for ZnA/SG catalyst reported by Nava et al 11 was followed. Tetraethoxysilane (Si(OEt) 4 , TEOS, 98%) was used as the source of silica gel.…”

Section: Methodsmentioning

confidence: 99%

“…Zinc ethanoate coated over silica gel was used as a heterogeneous catalyst in the present work. This catalyst was reported to have good characteristics in terms of its surface area, pore size, thermal stability and high conversion for the esterification reaction 10, 11. Zinc ethanoate was also used in a number of esterification and transesterification reactions at high temperature 12–14…”

Section: Introductionmentioning

confidence: 99%

Kinetics of esterification of palmitic acid with isopropanol using p‐toluene sulfonic acid and zinc ethanoate supported over silica gel as catalysts

Aafaqi

Mohamed

Bhatia

2004

J of Chemical Tech & Biotech

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Kinetic data on the esterification of palmitic acid with isopropanol were obtained using homogeneous (para-toluene sulfonic acid, p-TSA) and heterogeneous (zinc ethanoate coated on silica gel, ZnA/SG) catalysts in a batch reactor. The ZnA/SG catalyst was prepared using a sol-gel technique. The esterification reaction was studied at different reaction temperatures (373-443 K), initial reactants molar ratio (1-5), catalyst loading (1-5 gcat dm −3 ) and water concentration in feed (0-15 vol%). A power law rate equation was used for homogeneous kinetics analysis. The Langmuir Hinshelwood Hougen Watson (LHHW) model was used for heterogeneous kinetics. The kinetic parameters of both models were obtained using Polymath software. The reaction parameters were used to obtain simulated values of conversion for both catalytic systems. The simulated values were compared with the experimental values and were in good agreement.

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Esterification

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Synthesis, characterization and catalytic behavior of a zinc acetate complex immobilized on silica-gel

Cited by 18 publications

References 38 publications

Poly(Acrylamide-Co-Acrylic Acid)-Zinc Acetate Polymer Electrolytes: Studies Based on Structural and Morphology and Electrical Spectroscopy

Poly(Acrylamide-Co-Acrylic Acid)-Zinc Acetate Polymer Electrolytes: Studies Based on Structural and Morphology and Electrical Spectroscopy

Kinetics of esterification of palmitic acid with isopropanol using p‐toluene sulfonic acid and zinc ethanoate supported over silica gel as catalysts

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