The continuous production of Pt-based heterogeneous catalysts based on ultra-small (<2 nm) noble metal nanoparticles deposited on mesoporous ordered silica and their catalytic activity in VOC abatement are here reported. Microfluidic reactors can be used not only to enable the fast and controlled production of ultra-small Pt nanoparticles (NPs), but also alloyed NPs including PtPd, PtRu and PtRh can be formed in short residence times (between 60 s and 5 min). A novel continuous and homogeneous loading of these catalytic NPs on SBA-15 used as a mesoporous support is also here reported. This procedure eases the NP loading and minimizes washing post-treatments. A 12-fold decrease in the synthesis time was obtained when using this microfluidic reactor compared to the traditional batch production of Pt NPs. Microflow and batch type reactors yielded a Pt precursor conversion to generate Pt NPs with a 90% and 85% yield, respectively. Under the same conditions, the productivity of the microfluidic system (27 mg Pt NPs per h) was twice the one achieved in the conventional batch type reactor. The catalytic performance of the supported catalysts separately prepared by microfluidics and by conventional impregnation under the same conditions and with the same noble metal loading was also compared in the n-hexane abatement as a model of VOCs. Both catalysts were active in the VOC oxidation reaction but a 95% reduction in the catalyst synthesis time was obtained when using the catalysts produced in the microfluidic platform. For this reaction a long-term activity test was successfully carried out at 175 °C during 30 h on stream using the heterogeneous catalyst prepared by using the flow reactor.

中文翻译：

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致力于使用微流体系统连续生产基于Pt的多相催化剂†

本文报道了基于超小（<2 nm）贵金属纳米粒子沉积在介孔有序二氧化硅上的Pt基非均相催化剂的连续生产及其在减少VOC中的催化活性。微流体反应器不仅可以用于快速而受控地生产超小型Pt纳米颗粒（NP），而且可以在短停留时间（60秒至5分钟之间）内形成包括PtPd，PtRu和PtRh的合金NP。在此还报道了这些催化性NP在SBA-15上用作介孔载体的新型连续且均匀的负载。此过程可减轻NP的负载，并最大程度地减少清洗后处理的时间。与传统的批量生产Pt NP相比，使用该微流反应器可将合成时间减少12倍。微流反应器和间歇式反应器产生了Pt前驱体转化，生成的Pt NP的产率分别为90％和85％。在相同条件下，微流体系统的生产率（每小时27 mg Pt NP）是常规间歇式反应器的两倍。还比较了在相同的条件下和相同的贵金属载量下，通过微流体和常规浸渍分别制备的负载型催化剂的催化性能。ñ正己烷减排作为挥发性有机化合物的典范。两种催化剂在VOC氧化反应中均具有活性，但是当使用在微流体平台上生产的催化剂时，催化剂的合成时间减少了95％。对于该反应，使用通过使用流动反应器制备的非均相催化剂，成功地在175°C下进行了30 h的长期活性测试。