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首页> 美国卫生研究院文献>ACS Omega >Catalytic Dehydrochlorination of 12-Dichloroethaneinto Vinyl Chloride over Nitrogen-Doped Activated Carbon
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Catalytic Dehydrochlorination of 12-Dichloroethaneinto Vinyl Chloride over Nitrogen-Doped Activated Carbon

机译：12-二氯乙烷的催化脱氯化氢氮掺杂活性炭合成氯乙烯

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摘要

The pyrolysis of 1,2-dichloroethane (EDC) is the most popular commercialized way of producing vinyl chloride monomers (VCM); however, it is plagued by high-energy consumption and the resulting coke formation. Here, a series of nitrogen-doped (N-doped) activated carbon catalysts (N-AC) were prepared conveniently for EDC dehydrochlorination. The structural and textural properties of N-doped catalysts were characterized by X-ray diffraction, transmission electron microscopy, Raman spectra, temperature-programmed desorption of VCM and EDC, and X-ray photoelectron spectroscopy. The results revealed that doping N into activated carbon supports introduced basicity sites and caused partial graphitization on the catalyst surfaces. Thus, an improved absorption capacity to EDC and VCM and an accelerated desorption rate were obtained, which greatly enhanced EDC conversion and VCM selectivity. EDC was almost completely dehydrochlorided into vinyl chloride at a temperature of 300 °C and an EDC liquid hourly space velocity of 0.313 h–1. The high catalytic activity and selectivity as well as good stability suggested that the N-AC catalyst would be a promisingdehydrochlorination catalyst on an industrial scale.
机译：1,2-二氯乙烷（EDC）的热解是生产氯乙烯单体（VCM）的最流行的商业化方法。但是，它受到高能耗和由此形成的焦炭的困扰。在这里，方便地制备了一系列氮掺杂（N掺杂）活性炭催化剂（N-AC）用于EDC脱氯化氢。通过X射线衍射，透射电子显微镜，拉曼光谱，VCM和EDC的程序升温脱附以及X射线光电子能谱表征了N掺杂催化剂的结构和织构性质。结果表明，将N掺杂到活性炭中会引入碱性位点，并导致催化剂表面发生部分石墨化。因此，获得了对EDC和VCM的改进的吸收能力和加速的解吸速率，这大大提高了EDC的转化率和VCM的选择性。在300°C和0.33 h –1 的EDC液体时空速度下，EDC几乎完全脱氯化氢为氯乙烯。高催化活性和选择性以及良好的稳定性表明，N-AC催化剂将是一个有前途的工业规模的脱氯化氢催化剂。

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