It is shown that water-in-oil microemulsions (m/e or μE) can produce BaCeO₃ (BCO) and LaCoO₃ (LCO) precursors. The nanoparticles (NPs) adsorb on AlOOH sols, in much the same way as Turkevich previously immobilised platinum group metal sols. BCO is active in CO and propane oxidation and NO removal under stoichiometric exhaust conditions, but LCO is a better oxidation catalyst. Activity was also seen when Ba,Ce and La,Co are inserted into/segregate at the surface of AlOOH/Al₂O₃. However, there is only formation of low levels of BCO, CAIO₃ (CAO), LCO and LaAIO₃ (LAO) perovskites, along with aluminates and separate oxides. The complexing of cations by AlOOH surface-held oxalate ions, albeit with different efficiencies, has also been explored. All three routes yield active catalysts with micro-domains of crystallinity; microemulsions produce the best defined perovskite NPs, but even those from surface segregation have higher turnover numbers than traditional Pt catalysts. Perovskite NPs may open up green chemistry for air pollution control that is consistent with a circular economy.

中文翻译：

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从低能途径（TX100稳定的油包水微乳液，AlOOH /溶胶-凝胶Al ₂ O ₃胶体表面上的表面偏析和表面络合）途径进行纳米工程ABO ₃活性位点的污染控制催化

结果表明，油包水型微乳液（m / e或μE）可以产生BaCeO ₃（BCO）和LaCoO ₃（LCO）前体。纳米粒子（NPs）吸附在AlOOH溶胶上，其方式与Turkevich先前固定的铂族金属溶胶相同。在化学计量的排气条件下，BCO在CO和丙烷的氧化以及NO的去除方面具有活性，但LCO是更好的氧化催化剂。当Ba，Ce和La，Co被插入/分离在AlOOH / Al ₂ O ₃表面时，也观察到活性。但是，仅形成低水平的BCO，CAIO ₃（CAO），LCO和LaAIO ₃（LAO）钙钛矿以及铝酸盐和单独的氧化物。尽管具有不同的效率，也已经探索了由AlOOH表面保持的草酸根离子络合阳离子。所有这三种途径产生具有结晶微区的活性催化剂。微乳液可产生最佳的钙钛矿型NP，但即使是表面分离的乳液也比传统的Pt催化剂具有更高的周转率。钙钛矿NP可能会开辟绿色化学，以控制与循环经济相一致的空气污染。