FTIR study of adsorption and photochemistry of amide on powdered TiO2: Comparison of benzamide with acetamide

Liao, Li-Fen; Lien, Chen-Fu; Shieh, Dong‐Lin; Chen, Feng-Chun; Lin, Ja‐Chen

doi:10.1039/b204455m

Cited by 40 publications

(33 citation statements)

References 30 publications

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“…The peaks at 1550 and 1440 cm -1 are assigned as the amide I and II bands of the PAMAM dendrimer, which have been red shifted approximately 100 cm -1 by their interactions with the titania. Lin and coworkers found a similar shift in the amide stretching frequencies when they examined benzamide and acetamide deposited onto titania [30,31]. They attributed the lower stretching frequency to a weakened amide bond associated with a chelating adsorption onto the support.…”

Section: Toluene Hydrogenationmentioning

confidence: 66%

“…Titania is a well known oxidation catalyst, and no attempts were made to exclude oxygen during the deposition or handling of the sample. Further, surface carboxylates on titania have stretching frequencies similar to those of the amides [30][31][32] observation of an additional band at 1735 cm -1 when PAMAM dendrimers were deposited onto ZrO 2 . The new band was assigned to free carbonyl species [27], and the authors concluded that PAMAM dendrimers take on a different conformation when adsorbed onto zirconia [27].…”

Section: Toluene Hydrogenationmentioning

confidence: 82%

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CO Oxidation and Toluene Hydrogenation by Pt/TiO2 Catalysts Prepared from Dendrimer Encapsulated Nanoparticle Precursors

2008

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Generation 4 hydroxyl terminated polyamidoamine (PAMAM) dendrimer encapsulated nanoparticles (DENs) were examined as precursors for Pt/TiO 2 catalysts. In this preparation method, the dendrimers were initially used to template and stabilize Pt nanoparticles in solution. DENs were then deposited onto titania, and activation conditions for dendrimer thermolysis were examined. The interactions between PAMAM dendrimers and the titania were found to differ from previous reports of dendrimersupport interactions with silica, alumina, and zirconia. In the case of titania, the amide bonds were found to shift 100 cm -1 , indicating adsorption occurs primarily through amide-titania interactions. Infrared spectroscopy, CO oxidation catalysis, and toluene hydrogenation catalysis were used to evaluate protocols for removing the dendrimer. Thermal decomposition of the DENs in O 2 or CO/O 2 atmospheres led to the formation of surface isocyanates that were preferentially bound to the metal nanoparticles. CO oxidation catalysis was insensitive to the activation protocol used, and infrared spectroscopy of adsorbed CO showed only small differences in the basic surface properties of the resulting Pt catalysts. Toluene hydrogenation catalysis was more sensitive to different activation pretreatments. The most active hydrogenation catalysts resulted from short, low temperature (150°C) hydrogen treatments while longer treatments at higher temperature (300°C) resulted in slightly less active catalysts.

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Section: Toluene Hydrogenationmentioning

confidence: 66%

Section: Toluene Hydrogenationmentioning

confidence: 82%

CO Oxidation and Toluene Hydrogenation by Pt/TiO2 Catalysts Prepared from Dendrimer Encapsulated Nanoparticle Precursors

2008

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“…Combined with the fact that CeO 2 has no Brønsted acid sites, 7 it is found that carbonyl oxygen of acetamide interacts with a Lewis acid site (Ce cation) on CeO 2 (Scheme 9). 23 Second, IR spectra of adsorbed n-butylamine on CeO 2 and SiO 2 were compared. The NH stretching and NH bending bands of n-butylamine coordinatively adsorbed on CeO 2 24 appeared at lower wavenumber than those on SiO 2 .…”

Section: ç Reaction Mechanismmentioning

confidence: 99%

CeO2-catalyzed Transformations of Nitriles and Amides

2012

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Recently, cerium oxides have been extensively used as heterogeneous catalysts for green organic reactions. This review describes recent progress in such reactions, with a focus on our studies on pure CeO 2 -catalyzed reactions of nitriles and amides with nucleophiles (H 2 O, alcohols, and amines). Hydration of nitriles to amides in water, one-pot ester synthesis from nitriles and alcohols, one-pot synthesis of N-alkylamides from nitriles with amines, and synthesis of N-alkylamides from amides and amines (transamidation) are selectively catalyzed by CeO 2 under aqueous or solvent-free conditions. Mechanistic studies suggest that a cooperation of Lewis acid site (Ce 4+ cation) and acidbase (CeO) pair site plays essential roles in the catalytic reactions.

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“…The -C≡N, C-N and N-H str. of amide, -CH 3 , and -O-C≡N functionalities in dye were confirmed from peaks at 2088, 1633, 1385, and 1085 cm −1 , respectively [28,29]. In ETOH, the change in C-O str' intensity was substantiated via slight displacement of the peak from 1094 to 1085 cm -1 in ethanol-dye solution (see Fig.…”

Section: Ftir Analysismentioning

confidence: 82%

Enhanced performance of dye-sensitized solar cell with thermally stable natural dye-assisted TiO2/MnO2 bilayer-assembled photoanode

Datta

Dey

Singha

et al. 2020

Mater Renew Sustain Energy

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This study reports the performance analysis of an organic dye-sensitized solar cell (DSSC), introducing MnO2 as an electron transport layer in TiO2/MnO2 bilayer assembly. The DSSCs have been fabricated using TiO2 and TiO2/MnO2 layer-by-layer architecture films onto fluorine-doped tin oxide (FTO) glass and sensitized with natural dye extracted from Malvaviscus penduliflorus flower in ethanol medium. The counter electrode was prepared to layer copper powder containing paste onto FTO's conductive side by the doctor's blade method. The optical, morphological, and structural properties of photoanodes were explored via ultraviolet–visible, field emission scanning electron microscopy, and X-ray diffraction analyses. Moreover, dye complexity and thermostability of dyes were characterized via Fourier-transform infrared spectroscopy and thermogravimetric analyses. The iodide/triiodide (i.e., I−/I3−) redox couple of electrolyte solution was employed as a charge transport medium between the electrodes. Finally, photoanode and counter electrode sandwiches were assembled to envisage the photovoltaic performance potential under simulated AM 1.5G solar illumination using 100 mW cm–2 light intensity. The as-fabricated DSSC comprising TiO2/MnO2 bilayer assembly exhibited 6.02 mA cm–2 short circuit current density (Jsc), 0.38 V open-circuit voltage (Voc), 40.38% fill factor, and 0.92% conversion efficiency, which is about 200% higher compared to the assembly devoid of MnO2 layer.

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FTIR study of adsorption and photochemistry of amide on powdered TiO2: Comparison of benzamide with acetamide

Cited by 40 publications

References 30 publications

CO Oxidation and Toluene Hydrogenation by Pt/TiO2 Catalysts Prepared from Dendrimer Encapsulated Nanoparticle Precursors

CO Oxidation and Toluene Hydrogenation by Pt/TiO2 Catalysts Prepared from Dendrimer Encapsulated Nanoparticle Precursors

CeO2-catalyzed Transformations of Nitriles and Amides

Enhanced performance of dye-sensitized solar cell with thermally stable natural dye-assisted TiO2/MnO2 bilayer-assembled photoanode

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