Synthesis of Pt/K(2)CO(3)/MgAlO(x)-reduced graphene oxide hybrids as promising NO(x) storage-reduction catalysts with superior catalytic performance.
Synthesis of Pt/K(2)CO(3)/MgAlO(x)-reduced graphene oxide hybrids as promising NO(x) storage-reduction catalysts with superior catalytic performance.
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合成 Pt/K2CO3/MgAlOx 还原氧化石墨烯杂化物作为具有优异催化性能的有前途的 NOx 存储还原催化剂
DOI：
10.1038/srep42862
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发表时间：
2017-02-16
影响因子：
4.6
通讯作者：
Wang Q
中科院分区：
文献类型：
--
作者：
Mei X;Yan Q;Lu P;Wang J;Cui Y;Nie Y;Umar A;Wang Q
合成了Pt/K2 CO 3/MgAlOx还原氧化石墨烯（Pt/K/MgAlOx-rGO）杂化物，并对其进行了表征和测试，作为一种有前途的NOx储存和还原（NSR）催化剂。采用原位水热晶化法在rGO上制备了Mg-Al水滑石（LDHs）。使用各种技术对样品的结构和形态进行了彻底的表征。等温NOx吸附实验表明，MgAlOx-rGO杂化材料的NOx捕集性能优于MgAlOx，在0.44 ~ 0.61 mmol · g-1之间，这是由于颗粒分散性和稳定性的提高。此外，通过顺序浸渍获得了一系列负载有2wt%Pt和不同负载量（5、10、15和20wt%）的K2 CO 3的MgAlOx-rGO（表示为Pt/K/MgAlOx-rGO）。还评价了5%H2O对负载有2wt%Pt和10%K2CO3的MgAlOx-rGO（2 Pt/10 K/MgAlOx-rGO）催化剂的NOx储存容量的影响。总之，2 Pt/10 K/MgAlOx-rGO催化剂不仅表现出高的热稳定性和1.12 mmol · g−1的NOx储存容量，而且还具有优异的抗H2O性能和贫-富循环性能，总体NOx去除率为78.4%。本工作为制备高分散MgAlOx-rGO杂化NSR催化剂提供了一种新的方法。
Pt/K2CO3/MgAlOx–reduced graphene oxide (Pt/K/MgAlOx–rGO) hybrids were synthesized, characterized and tested as a promising NOx storage and reduction (NSR) catalyst. Mg–Al layered double hydroxides (LDHs) were grown on rGO via in situ hydrothermal crystallization. The structure and morphology of samples were thoroughly characterized using various techniques. Isothermal NOx adsorption tests indicated that MgAlOx–rGO hybrid exhibited better NOx trapping performance than MgAlOx, from 0.44 to 0.61 mmol · g−1, which can be attributed to the enhanced particle dispersion and stabilization. In addition, a series of MgAlOx–rGO loaded with 2 wt% Pt and different loadings (5, 10, 15, and 20 wt%) of K2CO3 (denoted as Pt/K/MgAlOx–rGO) were obtained by sequential impregnation. The influence of 5% H2O on the NOx storage capacity of MgAlOx–rGO loaded with 2 wt% Pt and 10% K2CO3 (2Pt/10 K/MgAlOx–rGO) catalyst was also evaluated. In all, the 2Pt/10 K/MgAlOx–rGO catalyst not only exhibited high thermal stability and NOx storage capacity of 1.12 mmol · g−1, but also possessed excellent H2O resistance and lean–rich cycling performance, with an overall 78.4% of NOx removal. This work provided a new scheme for the preparation of highly dispersed MgAlOx–rGO hybrid based NSR catalysts.