Fe modified mesoporous hollow carbon spheres for selective oxidation of ethylbenzene

Abstract

Fe modified hollow carbon spheres with large cavity and mesoporous shell (Fe-MHCs) were successfully synthesized by a simple pyrolysis and simultaneous deposition method. The organic molecules gases (carbon species) from pyrolysis of polystyrene deposited in the hard template at the catalysis of Fe species existing in the sample during calcination at high temperature. The obtained Fe-MHCs showed uniform spherical morphology with large surface area (924 m 2 g -1 ), mesoporous structure and a certain amount of Fe loaded. The Fe species and the special structure endowed the materials excellent catalytic activity in the oxidation of ethylbenzene to acetophenone. The conversion of 94.5% and the high selectivity to targeted product (97.4%) could be achieved and the acceptable recycling stability was also exhibited.

Functionalization of Hollow Nanomaterials for Catalytic Applications: Nanoreactor Construction

“…With the development of controllable synthetic methods, plenty of functionalization methods have been applied to implement the specialized design of catalysts. As a number of prior reviews have already thoroughly summarized the synthetic methods and the general applications, we particularly focus on the recent progress with respect to the functionalization of hollow nanomaterials for the rational design of catalysts in terms of functionalization methods and structure‐correlated catalysis . In this progress report, we will briefly introduce the functionalization strategies based on spatially delimited domains in Section ; then, as illustrated in Figure , we conduct an intensive discussions on case studies of functionalization strategies by the following categories in Section : geometric and composition modification, encapsulation, multishelled Matryoshka, anchored single atomic site, and surface molecular engineering; in Section , we summarize the research tendency of catalytic studies on hollow nanomaterials, and make concise prospects for the catalytic applications of functionalized hollow nanomaterials.…”

A Unique Fe–N4 Coordination System Enabling Transformation of Oxygen into Superoxide for Photocatalytic CH Activation with High Efficiency and Selectivity

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examples is the oxidation of ethylbenzene, yielding acetophenone that is an important raw material for producing medicines, fragrances, cellulose ethers, resins, flavoring agents, and many others. [6][7][8][9] However, the CH bond of ethylbenzene is so strong that its activation and cleavage usually require harsh conditions such as high temperatures. [10][11][12][13][14][15] In general, tert-butyl hydroperoxide or hydrogen peroxide is utilized to create hydroxyl radicals (•OH) with the help of a catalyst.

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N-Doped Hollow Carbon Spheres/Sheets Composite for Electrochemical Capacitor

“…7,8 The hard template method can offer better control for the desired morphology, mesoporous structure, and monodispersity. 9,10 However, the application of hollow mesoporous carbon spheres for supercapacitor is greatly limited because of the long-distance ion transfer. It is well established that carbon nanosheet (two-dimensional structure) presents a large surface area, low density, short-distance ion transfer, and high electronic conductivity, which can make up for the shortcomings of hollow mesoporous carbon spheres in respect of ion transportation.…”

“…A large number of approaches for preparing hollow mesoporous carbon spheres have been adopted, such as sol–gel strategy, template-based method, and chemical vapor deposition. In those syntheses, the hard template method has been well accepted as a common strategy, which involves the process of coating and carbonization of carbon precursor on the surface of the solid spherical template as well as removing the template. , The hard template method can offer better control for the desired morphology, mesoporous structure, and monodispersity. , …”