Wang Guangying, Liang Yan, Song Jian, Li Hui, Zhao Yu
Anhui Yuanchen Environmental Protection Technology Co., Ltd., Hefei, China.
College of Life and Environmental Sciences, Shanghai Normal University, Shanghai, China.
Front Chem. 2020 Apr 23;8:220. doi: 10.3389/fchem.2020.00220. eCollection 2020.
A neoteric hollow-NiPt@SiO core-shell structure catalyst with 7-nm-sized hollow NiPt alloy nanoparticle (NP) packaged by SiO shell was prepared by a classic Stober method. Compared with hollow-NiPt/SiO supported catalyst, the hollow-NiPt@SiO core-shell catalyst exhibited better activity and thermal stability in dry reforming of methane (CH) (DRM) with CO reaction, with CH/CO conversion to 97% and service life to 200 h at 800°C, respectively. In addition, the activity and stability of core-shell catalysts with different nuclei were tested. In contrast to the continuous deactivation of the supported catalyst, all the core-shell catalysts were able to maintain stability for 200 h, and the activity sequence was Hollow-NiPt > NiPt NPs > Pt NPs > Ni NPs. By characterization, we learned that hollow structure had an inner surface and thus had a larger active specific surface area than NP structure. In addition, NiPt NPs had better activity than Ni NPs and Pt NPs because Ni and Pt formed as alloy in NiPt NPs. Therefore, the efficient and thermally stable hollow-NiPt@SiO core-shell catalyst has a promising application prospect in DRM reaction and can make a considerable contribution to the sustainable use of energy.
采用经典的斯托伯方法制备了一种新型的空心NiPt@SiO核壳结构催化剂，其7纳米大小的空心NiPt合金纳米颗粒（NP）被SiO壳层包裹。与空心NiPt/SiO负载型催化剂相比，空心NiPt@SiO核壳催化剂在甲烷（CH）与一氧化碳（CO）的干重整反应（DRM）中表现出更好的活性和热稳定性，在800℃时CH/CO转化率分别达到97%，使用寿命达到200小时。此外，还测试了不同核的核壳催化剂的活性和稳定性。与负载型催化剂的持续失活相比，所有核壳催化剂都能保持200小时的稳定性，活性顺序为空心NiPt＞NiPt NPs＞Pt NPs＞Ni NPs。通过表征发现，空心结构具有内表面，因此比NP结构具有更大的活性比表面积。此外，NiPt NPs比Ni NPs和Pt NPs具有更好的活性，因为在NiPt NPs中Ni和Pt形成了合金。因此，高效且热稳定的空心NiPt@SiO核壳催化剂在DRM反应中具有广阔的应用前景，可为能源的可持续利用做出重要贡献。
