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Catalytic microreactor with electrodeposited hierarchically nanostructured nickel coatings for gas-phase fluorination reactions
Journal of Fluorine Chemistry ( IF 1.9 ) Pub Date : 2017-11-26 , DOI: 10.1016/j.jfluchem.2017.11.005
Maurizio Sansotera , Alberto Baggioli , Simona Ieffa , Mariella Tedesco , Benedetta Sacchi , Claudia L. Bianchi , Michele Navarrini , Massimo Migliori , Luca Magagnin , Walter Navarrini

The fabrication of a catalytic microreactor for the reaction of undiluted carbonyl difluoride and elemental fluorine to synthesize trifluoromethyl hypofluorite, CF3OF, on CsF catalyst supported on F2-passivated nanosctructured Ni coating was studied. The nanosctructured Ni support for catalyst immobilization was electrodeposited by a two-step procedure, consisting of a low current density step followed by a brief high current density one, for a hierarchical differentiation of structural features. An aqueous solution of NiCl2 with diethanolamine, as crystal modifier, and sodium lauryl sulphate, as anti-pitting agent, was used as electrolyte. Constant-pH Ni electrocrystallization was performed on H2SO4-etched Cu substrates in a range of pH from 1 to 4 via a HCl/H3BO3 based buffer. Passivation was carried out under up to 300 mbar of undiluted F2. XRD, XPS, SEM, AFM, and static contact angle measurements were performed. Ni coatings obtained from pH 3 electrolytes were selected for microreactor fabrication on the basis of characterization data, due to the reproducibility and homogeneity of the structured Ni layers. The catalytic microreactor allowed the quantitative production of CF3OF from pure reactants, on demand, and removing any criticality relative to thermal and safety control of the synthesis. The CF3O-group selective transfer ability of the synthetized hypofluorite has raised interest in pharmaceutical and agrochemical industries in recent years.



中文翻译:

带有电沉积的分层纳米结构镍涂层的催化微反应器,用于气相氟化反应

研究了催化微反应器的制备,该催化微反应器用于在F 2钝化的纳米结构Ni涂层上负载的CsF催化剂上使未稀释的二氟化羰基氟化物与元素氟反应以合成三氟甲基次萤石CF 3 OF 。通过两步程序电沉积用于催化剂固定的纳米结构化镍载体,该程序由低电流密度步骤和短暂的高电流密度步骤组成,用于结构特征的分级区分。将NiCl 2与二乙醇胺作为晶体改性剂,并将月桂基硫酸钠作为抗点蚀剂的水溶液用作电解质。在H 2 SO 4上进行恒定pH的Ni电结晶通过基于HCl / H 3 BO 3的缓冲液在1至4的pH范围内腐蚀Cu衬底。在不超过300 mbar的未稀释F 2下进行钝化。进行了XRD,XPS,SEM,AFM和静态接触角测量。由于结构化Ni层的可再现性和均质性,根据特征数据选择了从pH 3电解液中获得的Ni涂层用于微反应器的制造。催化微反应器允许按需从纯反应物定量生产CF 3 OF,并消除了相对于合成的热和安全控制的任何关键要求。CF 3合成的次萤石的O-基团选择性转移能力近年来引起了制药和农用化学工业的兴趣。

更新日期:2017-11-26
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