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Nanosized NiO particles wrapped into uniformly mesocaged silica frameworks as effective catalysts of organic amines

Paper ID Volume ID Publish Year Pages File Format Full-Text
43511 45974 2008 9 PDF Available
Title
Nanosized NiO particles wrapped into uniformly mesocaged silica frameworks as effective catalysts of organic amines
Abstract

Nanosized NiO-doped cage cubic Pm3n mesoporous silica materials with high Ni/Si contents (∼1) were fabricated via a simple and reproducible one-step synthetic route. Control over the large particle-like monoliths and 3D cage nanostructures was provided by applying an instant preformed liquid crystalline phase of Brij 78 (C18H35(OCH2CH2)20OH; C18EO20) surfactant as a template. The solid NiO–silica catalysts were characterized by means of various techniques including XRD, N2 isotherms, TEM, SEM, XPS and EDX. Results, in general, show the formation of ordered cage NiO–silica matrices even at high amounts of nickel contents to the composition domains. The NiO-supported cage monoliths afforded catalysts that were more active than the free-support NiO and NiO-supported amorphous silicas. The catalytic activity was assessed in the model oxidation reaction of organic amines using batch contact-time experiments over various temperature ranges. Among all catalysts used, the ordered cage catalyst with open, uniform pore architectures, high surface area and large pore volumes allowed efficient adsorption and diffusion of organic amines to the active site of NiO clusters, leading to a high degree of conversion and a high reaction rate. A practically important issue was developing the recyclable catalysts using NiO-doped cage monoliths; however, these catalysts retained their functionalities toward the oxidation of organic amines even after extended regeneration and recycle uses.

Graphical abstractThe fabrication of nanomaterials with the active network sites has led to efficient transport and easier diffusion of guest species in some catalytic applications. In this regard, nanosized NiO-doped cage cubic Pm3n mesoporous silica with high Ni/Si contents (∼1) was fabricated via a simple and reproducible one-step synthetic route. The NiO-supported cage monoliths can act as effective catalysts toward the oxidation of organic amines.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Brij 78 template; Organic amines; NiO clusters; Supported cage silica; Catalytic activity
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Nanosized NiO particles wrapped into uniformly mesocaged silica frameworks as effective catalysts of organic amines
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 337, Issue 2, 25 March 2008, Pages 121–129
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us