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Rationally Constructing A Nano MOF-Derived Ni and CQD Embedded N‑Doped Carbon Nanosphere for the Hydrogenation of Petroleum Resin at Low Temperature
journal contributionposted on 2021-02-23, 17:36 authored by Chenghong Wu, Xiaopeng Chen, Liqun Tang, Qiaolu Wei, Xiaojie Wei, Jiezhen Liang, Linlin Wang
A key issue in attaining highly efficient supported catalysts for the hydrogenation of unsaturated polymers arises from the entanglement between the number of exposed active sites and the severe internal mass transfer limitation caused by their large molecular size. Hence, an ultrasmall N-doped carbon nanosphere with Ni NPs and CQDs embedded (Ni-CQDs/NCNs) was reasonably constructed by low-temperature (400 °C) pyrolysis of the precursor CQDs@Nano-Ni-ZIFs. As-prepared Ni-CQDs/NCNs exhibited superior catalytic activity to a commercial 10% Pd/C catalyst in petroleum resin hydrogenation under a low temperature of 150 °C, which is 100 and 60 °C lower than that of previously reported Ni- and Pd-based catalysts, respectively. The excellent catalytic activity of Ni-CQDs/NCNs mainly contributes to the following factors: first, its ultrasmall structure (ca. 50 nm) eliminates the internal mass transfer limitation; second, the CQDs and N-doped carbon matrix stabilize the 53.1 wt % high-loading Ni NPs at a small size of 5.6 nm, providing abundant active sites; and third, the electronic regulation of N-doped carbon enhances the intrinsic activity of Ni, which was revealed by the experiments and DFT calculations. Besides, Ni-CQDs/NCNs exhibits long-term stability and appreciable magnetic separation performance, making it a considerable candidate for industrial application. This work not only offers a facile approach to prepare nano MOF-derived catalysts but also gives helpful instruction to the rational design of heterogeneous catalysts for the reaction involving large molecules.
mass transfer limitationultrasmall structurePetroleum ResinCQD50 nmNano MOF-Derived Nipetroleum resin hydrogenationseparation performanceultrasmall N-doped carbon nanosphereN-doped carbon matrix5.6 nmRationally ConstructingLow TemperaturePd-based catalystssiteNi NPsnano MOF-derived catalystsN-doped carbonDFT calculationsNi-CQD