还原氧化石墨烯的合成及其作为纳米铜和钯/铜催化剂载体用于CO选择性还原NO的研究
Synthesis of Reduced Graphene Oxide as a Support for Nano Copper and Palladium/Copper Catalysts for Selective NO Reduction by CO.
作者信息
do Nascimento Jéssica Rabelo, D'Oliveira Monique Ribeiro, Veiga Amanda Garcez, Chagas Carlos Alberto, Schmal Martin
机构信息
Nanotechnology Engineering Program, COPPE/PENt, Federal University of Rio de Janeiro, CEP 21941-972 Rio de Janeiro/RJ, Brazil.
Insitute of Chemistry, Federal University of Rio de Janeiro, CEP 21941-909 Rio de Janeiro/RJ, Brazil.
出版信息
ACS Omega. 2020 Sep 30;5(40):25568-25581. doi: 10.1021/acsomega.0c02417. eCollection 2020 Oct 13.
Copper and palladium/copper nanoparticles supported on reduced graphene oxide catalysts were synthesized and evaluated for the selective NO reduction by CO. The catalysts were characterized by XRD, nitrogen adsorption-desorption, TGA, XPS, TPR, XRD, STEM, and HRTEM. The STEM and HRTEM results showed high metal oxide dispersions on the rGO. XPS results showed the presence of Cu and Pd oxide species. The reduction of copper supported on the rGO occurred in two steps for CuO /rGO, while that for CuO -PdO /rGO occurred in one step for temperatures lower than 350 °C. Noteworthy is that the XRD results showed that the rGO structure was not affected after reduction at 350 °C. The XRD of reduction revealed the appearance of new phases for copper during the reduction. The catalysts were evaluated in NO reduction by CO. The tests showed that the reduced catalysts presented high performance with NO conversions and N selectivity above 85% at 350 °C.
合成了负载在还原氧化石墨烯催化剂上的铜和钯/铜纳米颗粒，并对其通过CO选择性还原NO的性能进行了评估。通过XRD、氮吸附-脱附、TGA、XPS、TPR、XRD、STEM和HRTEM对催化剂进行了表征。STEM和HRTEM结果表明，金属氧化物在rGO上具有高分散性。XPS结果表明存在Cu和Pd的氧化物物种。负载在rGO上的铜的还原过程中，对于CuO/rGO分两步进行，而对于CuO-PdO/rGO，在低于350°C的温度下则一步完成。值得注意的是，XRD结果表明，在350°C还原后rGO结构未受影响。还原过程的XRD显示，还原过程中铜出现了新相。对催化剂进行了CO还原NO的评估。测试表明，还原后的催化剂表现出高性能，在350°C时NO转化率和N选择性高于85%。
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