Macroscopic nanodiamonds/β-SiC composite as metal-free catalysts for steam-free dehydrogenation of ethylbenzene to styrene

被引:49
作者
Ba, Housseinou [1 ,2 ]
Liu, Yuefeng [1 ]
Mu, Xiaoke [1 ]
Doh, Won-Hui [1 ]
Nhut, Jean-Mario [1 ]
Granger, Pascal [2 ]
Cuong Pham-Huu [1 ]
机构
[1] Univ Strasbourg UdS, CNRS, UMR 7515, ICPEES, F-67087 Strasbourg 08, France
[2] Univ Lille, CNRS, UMR 8181, UCCS, F-59655 Villeneuve Dascq, France
关键词
Foam-structured materials; Pressure drop; Nanodiamonds; Silicon carbide; Metal-free catalyst; Ethylbenzene dehydrogenation; PRESSURE-DROP MEASUREMENTS; OXIDE-BASED CATALYST; SILICON-CARBIDE; SURFACE-CHEMISTRY; ACTIVE PHASE; SUPPORT; HYDROGENATION; NANOPARTICLES; REACTIVITY; DEPOSITION;
D O I
10.1016/j.apcata.2015.04.022
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Nanodiamonds (NDs), a typical sp(3)-like carbon, have an average size less than 10 nm with a large surfaceto-volume ratio, which contributes to a high surface activity than other types of carbon. However, the powder form of the material renders it difficult to use in large-scale applications, especially in the field of heterogeneous catalysis in which high pressure drop across the catalytic bed and difficulty of handling powder are the main drawbacks. In this work, a new hybrid structure consisting of nanodiamonddecorated porous beta-SiC foam matrix has been investigated as a metal-free catalyst in the steam-free dehydrogenation of ethylbenzene into styrene. The hybrid foam catalyst displays an excellent catalytic specific rate and stability in the direct catalytic dehydrogenation of ethylbenzene (EB) to styrene, The dehydrogenation activity (12.87 mmol(ST)/g(ND)/h /h, moles styrene products per gram of nanodiamonds per hour) is about 10 times higher with respect to the commercial K-Fe-based catalyst and 3.8 times higher than that of powder-form NDs without losing styrene selectivity (S-ST, =98%) and thus demonstrates the high catalytic efficiency of this metal-free catalyst for the studied reaction. This study shows a new development towards the practical use of such structured composite catalysts in the field of catalysis where high performance and stable catalyst are still under scrutiny. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:217 / 226
页数:10
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