Synthesis of nitrogen-containing ordered mesoporous carbon as a metal-free catalyst for selective oxidation of ethylbenzene

Wang, Jia; Li, Hongyang; Gu, Xuejun; Wang, Haihua

doi:10.1039/c4cc03372h

Cited by 69 publications

(53 citation statements)

References 32 publications

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“…Table 1 shows the catalytic performance of NOMC (with conversion rate of 84.5% and yield of 69.9%) is far better than that of CMK-3. However, the surface area of CMK-3 is much higher than NOMC, indicating surface area of catalyst has little effect on oxidation of ethylbenzene, which is identical to report [18]. During the oxidation process of ethylbenzene to acetyl benzene, the N atom derived from NOMC is not directly involved in the catalytic reaction.…”

Section: Resultssupporting

confidence: 65%

“…In Figure 2a, two peaks at 0.7 and 1.5 can be obviously observed, which can ben indexed to (100) and (110) facets, respectively. The space structure matched with two-dimensional hexagonal mesostructured further confirms NOMC is replicated from silica template [11]. The wide-angle X-ray diffraction pattern (Figure 2b Correspond to (002) and (100) facets of graphite, indicating mesoporous carbon is graphitized to some extent [12].…”

Section: Resultsmentioning

confidence: 76%

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Synthesis of Nitrogen-Doped Mesoporous Carbon for the Catalytic Oxidation of Ethylbenzene

Wang

Zhang

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Nitrogen-doped ordered mesoporous carbon (NOMC) was fabricated via a simple hard-template method by functionalized ionic liquids as carbon and nitrogen source, SBA-15 as a hard-template. The obtained NOMC materials have a high nitrogen content of 5.55 %, a high surface area of 446.2 m2 g-1, and an excellent performance in catalysing oxidation of ethylbenzene. The conversion rate of ethylbenzene can be up to 84.5% and the yield of acetophenone can be up to 69.9%, the results indicated that the NOMC materials have a faster catalytic rate and a higher production of acetophenone than catalyst-free and CMK-3, due to their uniform pore size, high surface area and rich active sites in the carbon pore walls. IntroductionOwing to various pore structures, high specific surface area and pore volume, mesoporous materials can be extensively used in many fields, such as purification of gases or liquids, separation of mixture, catalysis, etc. [1, 2, and 3]. With the continuous development of mesoporous carbon, mesoporous carbon materials are also capable of being utilized in a number of new filed, like flammable gas storage (hydrogen, methane), electric energy storage (supercapacitor) [4,5]. The widely extended application areas make porous carbon have special properties, such as pore structures, surface chemical properties, crystalline order and morphologies [6,7]. The surface chemical properties and morphologies of materials are crucial for numerous fields. Hence, preparation of highly ordered mesoporous carbon materials is the key point of many researches. In this sense, Nano casting is a very effective method for preparing ordered mesoporous materials and hard-template method is one of the typical synthetic approaches: the pores of crystalline inorganic solids (like zeolites, ordered mesoporous silica) as template are infiltrated by carbon precursors, the ordered mesoporous carbon can be obtained after carbonization to remove template [8]. As a result, carbon materials with different structures and morphologies can be made on the basis of different templates. Because SBA-15 possesses comparatively high surface are, large pore volume, uniform pore size as well as good hydrothermal stability among masses of templates, it is often applied to prepare carbon materials [9]. By using SBA-15 as hard-template and glycerin as carbon source, M. Ignaz and co-workers tuned the infiltration amount of glycerin and successfully prepared highly ordered mesoporous carbon.However, due to the amorphous silica framework of SBA-15, the chemical activity is similar to common silica and framework is liable to collapse during high-temperature crystallization, leading to low catalytic and ion exchange capacity. In order to overcome the deficiency of carbon materials, researchers have done a large number of works to change the surface chemical properties and

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Section: Resultssupporting

confidence: 65%

Section: Resultsmentioning

confidence: 76%

Synthesis of Nitrogen-Doped Mesoporous Carbon for the Catalytic Oxidation of Ethylbenzene

Wang

Zhang

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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“…A N atom is usually induced into the carbon matrix (denoted as NOMC) to improve their properties . For the first time, Su et al. tested a NOMC material as a metal‐free catalyst for organic transformation.…”

Section: Oxidationmentioning

confidence: 99%

Heteroatom‐Enhanced Metal‐Free Catalytic Performance of Carbocatalysts for Organic Transformations

Shang

Gao

2019

ChemCatChem

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The exploitation and design of metal‐free catalysts for chemical transformation is always a fascinating theme from the prospective of fundamental and applied research. In addition to their distinct advantages such as lower cost, higher biocompatibility and reliability and thus higher sustainability, metal‐free materials often unexpectedly render different reaction pathway or mechanism from conventional metal catalysts. As a consequence, metal‐free catalysts have revolutionized and expanded the platform of catalysis. Among them, carbons are a typical class of nonmetallic materials. To date, a series of elements (e. g., B, N, P or S) as heteroatom dopants have equipped pristine carbons with enhanced performance and even new chemical functionality. It was proposed to attribute to modulated electrical properties and surface physicochemical features originated from structural distortions and changes of charge densities. In this minireview, we overviewed the catalytic application of heteroatom‐doped carbocatalysts in oxidation, oxidative coupling, reduction and hydrogenation reactions with special emphasis on the role of heteroatoms and consequently enhanced performance. This minireview highlights the structure‐activity correlations, thereby directing the rational design of advanced metal‐free catalysts for organic synthesis. Some controversies about active sites and challenges in catalyst design are also discussed here.

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“…The carbonaceous materials (active carbon, AC; graphene, G; CNTs; etc.) have generally been employed as the support materials to improve the catalytic activity or as the catalysts used in the reaction . Generally, it is considered that surface oxygen groups located at the carbon materials are the active sites to activate oxygen molecule in the oxidative reaction …”

Section: Introductionmentioning

confidence: 99%

Synthesis of Polyoxymethylene Dimethyl Ethers from Dimethyl Ether Direct Oxidation over Carbon‐Based Catalysts

Gao

Wang

et al. 2017

ChemCatChem

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The synthesis of polyoxymethylene dimethyl ethers (DMMx) with a selectivity of 84.3 % by direct oxidation of dimethyl ether (DME) was realized over 30 %Ti(SO4)2/active carbon (AC) catalyst. This process also significantly promotes the growth of the C−O chain. The catalytic performances of Ti(SO4)2/AC and Ti(SO4)2/graphene (G) catalysts differ largely for DME oxidation reaction, although both AC and G are carbon materials. The carbonyl and hydroxyl groups on the surface of the carbon‐based catalysts play an important role in DME direct oxidation to DMMx. Owing to the differences of surface structure and chemical properties of AC and G materials, the different interaction between the Ti(SO4)2 and supports remarkably affects the sulfate structures on the supports surface and leads to the large differences in the acid and redox properties of catalysts.

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Synthesis of nitrogen-containing ordered mesoporous carbon as a metal-free catalyst for selective oxidation of ethylbenzene

Abstract: Nitrogen-containing ordered mesoporous carbon (NOMC) was synthesized by using m-aminophenol (MAP) as a carbon and nitrogen co-precursor via a co-assembly process with F127 in aqueous phase and exhibited a good catalytic performance for selective oxidation of ethylbenzene.

Cited by 69 publications

References 32 publications

Synthesis of Nitrogen-Doped Mesoporous Carbon for the Catalytic Oxidation of Ethylbenzene

Synthesis of Nitrogen-Doped Mesoporous Carbon for the Catalytic Oxidation of Ethylbenzene

Heteroatom‐Enhanced Metal‐Free Catalytic Performance of Carbocatalysts for Organic Transformations

Synthesis of Polyoxymethylene Dimethyl Ethers from Dimethyl Ether Direct Oxidation over Carbon‐Based Catalysts

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