Vapor phase nitration of benzene using mesoporous MoO3/SiO2 solid acid catalyst

Umbarkar, Shubhangi B.; Biradar, Ankush V.; Mathew, Sanyo M.; Shelke, S. B.; Malshe, Kusum M; Patil, Pratap T.; Dagde, S. P.; Niphadkar, S. P.; Dongare, Mohan K.

doi:10.1039/b600094k

Cited by 50 publications

(28 citation statements)

References 16 publications

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“…Accordingly, the mean value of the crystallite size was evaluated for each multilayered thin film as inferred from Table . It is revealed from the data compiled in this table that the mean crystallite size exhibits a slight increase by increasing the number of spray cycles, resulting in better crystallinity of the α‐MoO 3 thin films by assembling smaller crystallites to form larger crystallites …”

Section: Resultsmentioning

confidence: 99%

Photochromic Response and Steady‐State Photoconductivity of Fibrous‐Reticulated α‐MoO₃ Thin Films Prepared by Modified Spray Pyrolysis Technique

Badr

Afify

El-Anssary

et al. 2019

Crystal Research and Technology

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A modified spray pyrolysis technique is used for preparing α‐MoO3 thin films after subsequent heat treatment at a relatively low temperature. The spray parameters are selected through a wide variety of elaboration conditions for best photochromic features. Different numbers of spraying and drying cycles are performed to investigate the thickness effect on the structural, morphological, optical, electrical, and photo‐electrical properties of the nanostructured α‐MoO3 films. These film samples are characterized by X‐ray diffraction (XRD) and scanning electron microscopy (SEM), and thus the film thickness effect is elucidated and correlated to the crystallite shape and size. The SEM micrographs show fibrous‐reticulated morphology for all the film samples investigated here. The photochromic properties of α‐MoO3 sprayed thin films are investigated by measuring the transmission spectra before and after UV‐light exposure. The changes in the optical transmission of these film samples are monitored for different exposure times. The UV exposure time effect as well as the thickness effect on the photochromic response of the film samples is investigated and discussed based on the particle size analysis. The photosensitivity is evaluated in various illumination levels to elucidate the carrier transport in the α‐MoO3 films and to determine the type of the recombination processes in these films.

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Section: Resultsmentioning

confidence: 99%

Photochromic Response and Steady‐State Photoconductivity of Fibrous‐Reticulated α‐MoO₃ Thin Films Prepared by Modified Spray Pyrolysis Technique

Badr

Afify

El-Anssary

et al. 2019

Crystal Research and Technology

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“…From BET analysis, it can be observed that both surface area and pore volume was decreased after annealing. As a result of annealing smaller crystallites assembled to form larger crystallites [38,39]. Moreover XRD study reveals that crystallite size also increases from 36 to 63 nm after annealing.…”

Section: Surface Area Analysismentioning

confidence: 90%

Chemically Grown MoO3 Nanorods for Antibacterial Activity Study

Desai¹,

Mali²,

Kondalkar³

et al. 2015

J Nanomed Nanotechnol

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In the present investigation, sea urchin like morphology of h-MoO 3 nanorods are successfully synthesized by chemical bath deposition (CBD) technique. The thermal stability, structural details, morphology and compositional analysis of MoO 3 was done using thermogravimetry (TGA), X-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HR-TEM), selected area electron diffraction (SAED) and X-ray photoelectron spectroscopy (XPS) techniques respectively. The thermal analysis reveals presence of sharp exothermic peak at 409ºC indicating irreversible phase transition. X-ray diffraction pattern showed hexagonal to orthorhombic phase transition after annealing at 450ºC. As synthesized h-MoO 3 shows well oriented hexagonal rods with sea urchin like architecture while that of annealed MoO 3 sample revealed 2D layer by layer growth. The SAED pattern confirms single crystalline nature of as synthesized h-MoO 3 and polycrystalline nature of annealed α-MoO 3 . While XPS study of both confirms Mo +6 and O 2-oxidation states of elements. Furthermore, characteristic antibacterial properties of h-MoO 3 and α-MoO 3 against gram positive Bacillus megaterium, Streptococcus aureus and gram negative Escherichia coli is noted.

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“…A series of MoO 3 -SiO 2 catalysts with varying molybdenum concentrations (5-20 mol%) were prepared by modification of sol-gel technique following the literature reported method [26]. Ammonium heptamolybdate (AHM) and tetraethyl orthosilicate (TEOS) were used as molybdenum and silica sources, respectively.…”

Section: Catalyst Preparationmentioning

confidence: 99%

An Efficient and Eco-friendly MoO3–SiO2 Solid Acid Catalyst for Electrophilic Aromatic Nitration with N2O5

et al. 2011

Catal Lett

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Electrophilic aromatic nitration using N 2 O 5 as a green nitrating agent catalyzed by MoO 3 -SiO 2 under mild conditions has been described. A series of MoO 3 -SiO 2 catalysts with varying MoO 3 loadings (5-20 mol%) were prepared by sol-gel technique and characterized using FTIR, XRD, SEM, BET and NH 3 -TPD to study its surface properties. MoO 3 -SiO 2 shows good catalytic activity and reusability for the nitration of alkyl and halogen aromatics giving high conversions, but less efficiency for the deactivated aromatics. Reactions conducted under non-acidic conditions using N 2 O 5 makes the process safe and environmentally friendly.

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Vapor phase nitration of benzene using mesoporous MoO3/SiO2 solid acid catalyst

Cited by 50 publications

References 16 publications

Photochromic Response and Steady‐State Photoconductivity of Fibrous‐Reticulated α‐MoO₃ Thin Films Prepared by Modified Spray Pyrolysis Technique

Photochromic Response and Steady‐State Photoconductivity of Fibrous‐Reticulated α‐MoO₃ Thin Films Prepared by Modified Spray Pyrolysis Technique

Chemically Grown MoO3 Nanorods for Antibacterial Activity Study

An Efficient and Eco-friendly MoO3–SiO2 Solid Acid Catalyst for Electrophilic Aromatic Nitration with N2O5

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Vapor phase nitration of benzene using mesoporous MoO3/SiO2 solid acid catalyst

Cited by 50 publications

References 16 publications

Photochromic Response and Steady‐State Photoconductivity of Fibrous‐Reticulated α‐MoO3 Thin Films Prepared by Modified Spray Pyrolysis Technique

Photochromic Response and Steady‐State Photoconductivity of Fibrous‐Reticulated α‐MoO3 Thin Films Prepared by Modified Spray Pyrolysis Technique

Chemically Grown MoO3 Nanorods for Antibacterial Activity Study

An Efficient and Eco-friendly MoO3–SiO2 Solid Acid Catalyst for Electrophilic Aromatic Nitration with N2O5

Contact Info

Product

Resources

About

Photochromic Response and Steady‐State Photoconductivity of Fibrous‐Reticulated α‐MoO₃ Thin Films Prepared by Modified Spray Pyrolysis Technique

Photochromic Response and Steady‐State Photoconductivity of Fibrous‐Reticulated α‐MoO₃ Thin Films Prepared by Modified Spray Pyrolysis Technique