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首页> 美国卫生研究院文献>Nanomaterials >Increasing the Size-Selectivity in Laser-Based g/h Liquid Flow Synthesis of Pt and PtPd Nanoparticles for CO and NO Oxidation in Industrial Automotive Exhaust Gas Treatment Benchmarking
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Increasing the Size-Selectivity in Laser-Based g/h Liquid Flow Synthesis of Pt and PtPd Nanoparticles for CO and NO Oxidation in Industrial Automotive Exhaust Gas Treatment Benchmarking

机译：在工业汽车废气处理基准测试基准测试基准基准基准测试基准基础上的PT和PTPD纳米粒子的基于激光的G / H液体流合成的尺寸选择性

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摘要

PtPd catalysts are state-of-the-art for automotive diesel exhaust gas treatment. Although wet-chemical preparation of PtPd nanoparticles below 3 nm and kg-scale synthesis of supported PtPd/Al O are already established, the partial segregation of the bimetallic nanoparticles remains an issue that adversely affects catalytic performance. As a promising alternative, laser-based catalyst preparation allows the continuous synthesis of surfactant-free, solid-solution alloy nanoparticles at the g/h-scale. However, the required productivity of the catalytically relevant size fraction <10 nm has yet to be met. In this work, by optimization of ablation and fragmentation conditions, the continuous flow synthesis of nanoparticles with a productivity of the catalytically relevant size fraction <10 nm of >1 g/h is presented via an in-process size tuning strategy. After the laser-based preparation of hectoliters of colloid and more than 2 kg of PtPd/Al O wash coat, the laser-generated catalysts were benchmarked against an industry-relevant reference catalyst. The conversion of CO by laser-generated catalysts was found to be equivalent to the reference, while improved activity during NO oxidation was achieved. Finally, the present study validates that laser-generated catalysts meet the size and productivity requirements for industrial standard operating procedures. Hence, laser-based catalyst synthesis appears to be a promising alternative to chemical-based preparation of alloy nanoparticles for developing industrial catalysts, such as those needed in the treatment of exhaust gases.
机译：PTPD催化剂是用于汽车柴油废气处理的最先进的。尽管已经建立了PTPD纳米颗粒的湿化学制剂，但已经建立了3nm和kg级合成的支持的PTPD / Al O，但是双金属纳米颗粒的部分偏析仍然存在对催化性能产生不利影响的问题。作为有前途的替代方案，基于激光的催化剂制剂允许在G / H级以G / H级连续合成表面活性剂的固溶性合金纳米颗粒。然而，尚要求催化相关尺寸分数<10nm的所需生产率尚未满足。在这项工作中，通过优化消融和碎裂条件，通过在工艺程尺寸调谐策略中呈现具有催化相关尺寸分数<10nm> 1g / h的生产率的纳米颗粒的连续流动合成。在基于激光的胶体制剂和超过2kg PTPD / Al O洗涤涂层的制剂之后，激光产生的催化剂是针对行业相关参考催化剂的基准性。发现CO通过激光产生的催化剂转化为等同于参考文献，同时实现了在没有氧化的改善的活性。最后，本研究验证了激光产生的催化剂符合工业标准操作程序的尺寸和生产率要求。因此，基于激光的催化剂合成似乎是用于开发工业催化剂的合金纳米颗粒的化学品制备的有希望的替代方案，例如处理废气所需的那些。

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