title: Synthesis of Pt/K2CO3/MgAlOx-reduced graphene oxide hybrids as promising NOxstorage-reduction catalysts with superior catalytic performance.
abstract: Pt/K2CO3/MgAlOx-reduced graphene oxide (Pt/K/MgAlOx-rGO) hybrids were synthesized, characterized and tested as a promising NOxstorage 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 NOxadsorption tests indicated that MgAlOx-rGO hybrid exhibited better NOxtrapping 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 NOxstorage 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 NOxstorage capacity of 1.12 mmol · g-1, but also possessed excellent H2O resistance and lean-rich cycling performance, with an overall 78.4% of NOxremoval. This work provided a new scheme for the preparation of highly dispersed MgAlOx-rGO hybrid based NSR catalysts.
authors.affiliation: College of Environmental Science and Engineering, Beijing Forestry University, 35 Qinghua East Road, Haidian District, Beijing 100083, P. R. China.
authors.forename: Xueyi
authors.initials: X
authors.lastname: Mei
authors.affiliation: College of Environmental Science and Engineering, Beijing Forestry University, 35 Qinghua East Road, Haidian District, Beijing 100083, P. R. China.
authors.forename: Qinghua
authors.initials: Q
authors.lastname: Yan
authors.affiliation: College of Environmental Science and Engineering, Beijing Forestry University, 35 Qinghua East Road, Haidian District, Beijing 100083, P. R. China.
authors.forename: Peng
authors.initials: P
authors.lastname: Lu
authors.affiliation: Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, Yunnan, P. R. China.
authors.forename: Junya
authors.initials: J
authors.lastname: Wang
authors.affiliation: College of Environmental Science and Engineering, Beijing Forestry University, 35 Qinghua East Road, Haidian District, Beijing 100083, P. R. China.
authors.forename: Yuhan
authors.initials: Y
authors.lastname: Cui
authors.affiliation: College of Environmental Science and Engineering, Beijing Forestry University, 35 Qinghua East Road, Haidian District, Beijing 100083, P. R. China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Nie
authors.affiliation: Department of Chemistry, College of Science and Arts, Najran University, Najran-11001, Kingdom of Saudi Arabia.|Promising Centre for Sensors and Electronic Devices (PCSED), Najran University, Najran-11001, Kingdom of Saudi Arabia.
authors.forename: Ahmad
authors.initials: A
authors.lastname: Umar
authors.affiliation: College of Environmental Science and Engineering, Beijing Forestry University, 35 Qinghua East Road, Haidian District, Beijing 100083, P. R. China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Wang