A Novel Ni/NiF2‐AlF3 Catalyst with Mild‐Strength Lewis Acid Sites for Dehydrofluorination of 1, 1, 1, 2‐Tetrafluoroethane to Synthesize Trifluoroethylene,ChemistrySelect

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A Novel Ni/NiF2‐AlF3 Catalyst with Mild‐Strength Lewis Acid Sites for Dehydrofluorination of 1, 1, 1, 2‐Tetrafluoroethane to Synthesize Trifluoroethylene
ChemistrySelect ( IF 1.9 ) Pub Date : 2019-04-17 , DOI: 10.1002/slct.201803947
Zhiwen Xi ₁ , Xing Liu ₁ , Junhui Li ₂ , Juanjuan Yuan ₁ , Wenzhi Jia ₃ , Xinhua Liu ₄ , Min Liu ₁ , Zhirong Zhu ₁

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A novel Ni/NiF₂‐AlF₃ catalyst was prepared by impregnation and following vapor hydrofluorination, and it was used to dehydrofluorination of tetrafluoroethane to trifluoroethylene. BET, SEM, XRD, XPS, NH₃‐TPD and Py‐IR techniques were employed to characterize the Ni/NiF₂‐AlF₃ catalysts. Based on the NH₃‐TPD results, it was interestingly found that the strong acidic sites of Ni/NiF₂‐AlF₃ catalyst transformed into the mid‐strength acidic sites with the increase of Ni loading, attributing to the roles of Ni on the catalyst surface. Compared with the NiF₂‐AlF₃ catalyst, the added Ni particles can improve the catalyst activity and stability for dehydrofluorination of 1, 1, 1, 2‐tetrafluoroethane. The best performance was obtained at Al/Ni=2 over the Ni/NiF₂‐AlF₃ catalyst, with high trifluoroethylene selectivity(99%) and CF₃CFH₂ conversion of 21.3%, after the reaction for 20 h on‐time stream at 500 °C, which showed the better application possibility as a heterogeneous dehydrofluorination catalyst. It was suggested that catalytic performance was related with the mid‐strength Lewis acidity on the catalyst surface. And the Ni/NiF₂‐AlF₃ catalyst (Al/Ni=2) possessed the good catalytic stability due to the mild‐strength Lewis acid sites.

中文翻译：

新型Ni / NiF2-AlF3催化剂，具有弱强度路易斯酸位点，可将1，1，1，2，2-四氟乙烷脱氟化氢合成三氟乙烯

通过浸渍和随后的气相氢氟化制备了一种新型的Ni / NiF ₂ -AlF ₃催化剂，并将其用于将四氟乙烷脱氟化氢为三氟乙烯。采用BET，SEM，XRD，XPS，NH ₃ -TPD和Py-IR技术表征了Ni / NiF ₂ -AlF ₃催化剂。根据NH ₃ -TPD结果，有趣地发现，随着Ni负载量的增加，Ni / NiF ₂ -AlF ₃催化剂的强酸性部位转变为中强度酸性部位，这归因于Ni在催化剂中的作用。催化剂表面。与NiF ₂ -AlF ₃相比催化剂中，添加的Ni颗粒可提高催化剂活性和1 ,, 1，1，2-四氟乙烷的脱氟化氢稳定性。在按时反应20小时后，在Ni / NiF ₂ -AlF ₃催化剂上，在Al / Ni = 2处获得最佳性能，具有高三氟乙烯选择性（99％）和CF ₃ CFH ₂转化率为21.3％。在500°C的温度下，它显示出作为非均相脱氢氟化催化剂的更好的应用可能性。有人认为，催化性能与催化剂表面中等强度的路易斯酸度有关。Ni / NiF ₂ -AlF ₃催化剂（Al / Ni = 2）由于具有中等强度的路易斯酸位而具有良好的催化稳定性。

更新日期：2019-04-17

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