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首页> 外文期刊>Catalysis science & technology >Sub-nano MgF2 embedded in carbon nanofibers and electrospun MgF2 nanofibers by one-step electrospinning as highly efficient catalysts for 1,1,1-trifluoroethane dehydrofluorination
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Sub-nano MgF2 embedded in carbon nanofibers and electrospun MgF2 nanofibers by one-step electrospinning as highly efficient catalysts for 1,1,1-trifluoroethane dehydrofluorination

机译：Sub-nano MgF2嵌入碳纳米纤维通过一步实际上电纺MgF2纳米纤维电纺的高效催化剂1, 1, 1-trifluoroethane dehydrofluorination

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摘要

Hydrofluorocarbons (HFCs) which are usually potent greenhouse gases are regulated by the Montreal Protocol and its amendments, especially the recent Kigali Amendment. Dehydrofluorination of HFCs is an efficient route for the conversion of these greenhouse gases to value added and environmentally benign chemicals. Although AlF3 with strong Lewis acidity catalyzes dehydrofluorination, it also favors carbon deposition. MgF2 with weak acidity inhibits coking significantly. Unfortunately, MgF2 sinters dramatically at temperatures below 300 °C leading to the low activity for dehydrofluorination. In the present work, we report that sub-nano MgF2 embedded in carbon fibers and electrospun MgF2 fibers prevent sintering of MgF2 during dehydrofluorination reaction. Via simple and one-step electrospinning and calcination in a N2 (for embedded MgF2) or air (for MgF2 fibers) atmosphere, embedded MgF2 with particle sizes between 3-6 nm and pure MgF2 fibers with diameters of around 100 nm were fabricated. No sintering was observed following reaction at 450 °C. The fine MgF2 particles and MgF2 fibers facilitate the formation of under coordinated Mg species in MgF2 which are the weak acid sites. By embedding MgF2 or fabrication of MgF2 fibers, weak acid sites are increased significantly, while strong acid sites remain almost unchanged. Hence, they show significantly higher reaction rates than MgF2 prepared by precipitation of Mg(CH3COO)2·4H2O with NH4F for the dehydrofluorination of 1,1,1-trifluoroethane (HFC-143a) to VDF (CH2=CF2) at 450 °C.
机译：氢氟碳化合物(HFCs)通常是有效的温室气体是由蒙特利尔协议及其修正案,尤其是最近基加利修正案。高果糖玉米糖浆的转换是一种有效的途径这些附加值和温室气体环保的化学物质。具有较强的路易斯酸催化dehydrofluorination,也有利于碳沉积。炼焦。在温度低于300°C为dehydrofluorination低活动。目前的工作,我们报告sub-nano MgF2嵌入在碳纤维和实际上电纺MgF2纤维防止MgF2在烧结dehydrofluorination反应。一步电纺的N2和煅烧(对于嵌入式MgF2)或空气(MgF2纤维)大气,嵌入式MgF2粒子大小3 - 6 nm和纯MgF2纤维之间直径约100海里是捏造的。烧结在450之后的反应°C。促进协调下毫克的形成物种MgF2弱酸网站。嵌入MgF2或MgF2纤维的制造,弱酸性网站显著增加,而强酸网站仍然几乎不变。因此,他们表现出更高的反应率比MgF2由降水4毫克(CH3COO) 2·h2o和NH4Fdehydrofluorination 1, 1, 1-trifluoroethane(hfc - 143 a)氟乙烯(CH2 = CF2)在450°C。

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