One of the major reasons for studying chemical kinetics is to use measurements of the macroscopic properties of a system, such as the rate of change in the concentration of reactants or products with time. 6940-78-9, Name is 1-Bromo-4-chlorobutane, formurla is C4H8BrCl. In a document, author is Zhou, Qin, introducing its new discovery. Recommanded Product: 6940-78-9.
Nanocarbons as alternatives to metal-based catalysts have attracted great interest in heterogeneous catalysis. However, the powder form of nanocarbons limits their industrial applications because of the large pressure drop in a fixed-bed reactor and the big difficulties in handling loose powder in a fluidized-bed reactor. To address these issues, herein, we report a general poly(imidazolium-methylene)-assisted grinding strategy for synthesizing mechanically robust nanocarbon-embedded network monoliths by grinding a mixture composed of nanocarbons and the as-formed poly(imidazolium-methylene) chloride (PImM) with a subsequent pyrolysis process. The as-prepared nanocarbon-based network monoliths feature nanocarbons to be well-dispersed within a N-doped carbon (NC) network. The monolith is adequately hard and high density and can be cracked and sieved into granule nanocarbon catalysts. Taking nanodiamonds (NDs) as an example, in the grinding procedure, PImM can penetrate into ND aggregates to disperse NDs and can adhere the deagglomerated NDs because there is a strong interaction between NDs and PImM through strong cation-p interactions, pi-pi interactions, and electrostatic interactions since many nanocarbons including NDs have negative charges on their surface. The designed PImM plays three roles in the preparation of ND-embedded network monolith including the adhering agent, isolating agent, and a precursor of the NC network. The resulting granule ND@NC carbocatalyst from its corresponding ND@NC network monolith shows 6.39 mmol g(-1) h(-1) of steady-state styrene rate (9.26 and 2.24 times higher compared to that of NC and ND, respectively) with 99.0% of styrene selectivity for ethylbenzene direct dehydrogenation (EDH) to styrene, a commercially important reaction. The granule ND@NC carbocatalyst also shows high catalytic stability for EDH reaction. The strategy has been extended to carbon nanofiber-embedded monoliths. This work not only creates a granule carbocatalyst for styrene production via EDH reaction but also paves an avenue to overcome the bottleneck problems regarding the applications of the powders of diverse nanocarbons in heterogeneous catalysis.
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Reference:
Chloride – Wikipedia,
,Chlorides – an overview | ScienceDirect Topics