Fabrication of bimetallic Cu–Zn adsorbents with high dispersion by using confined space for gas adsorptive separation

doi:10.1007/s11705-022-2202-y

Front. Chem. Sci. Eng.

2022, Vol. 16

Issue (11) : 1623-1631 https://doi.org/10.1007/s11705-022-2202-y

RESEARCH ARTICLE

Fabrication of bimetallic Cu–Zn adsorbents with high dispersion by using confined space for gas adsorptive separation

Yu-Chao Wang, Tian-Tian Li, Li Huang, Xiao-Qin Liu, Lin-Bing Sun(

)

State Key Laboratory of Materials-Oriented Chemical Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China

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Abstract

The number of active components and their dispersion degree are two key factors affecting the performance of adsorbents. Here, we report a simple but efficient strategy for dispersing active components by using a confined space, which is formed by mesoporous silica walls and templates in the as-prepared SBA-15 (AS). Such a confined space does not exist in the conventional support, calcined SBA-15, which does not contain a template. The Cu and Zn precursors were introduced to the confined space in the AS and were converted to CuO and ZnO during calcination, during which the template was also removed. The results show that up to 5 mmol·g^–1 of CuO and ZnO can be well dispersed; however, severe aggregation of both oxides takes place in the sample derived from the calcined SBA-15 with the same loading. Confined space in the AS and the strong interactions caused by the abundant hydroxyl groups are responsible for the dispersion of CuO and ZnO. The bimetallic materials were employed for the adsorptive separation of propene and propane. The samples prepared from the as-prepared SBA-15 showed superior performance to their counterparts from the calcined SBA-15 in terms of both adsorption capacity of propene and selectivity for propene/propane.

Keywords bimetallic adsorbents confined space mesoporous silica propene/propane separation

Corresponding Author(s): Lin-Bing Sun

Online First Date: 17 October 2022 Issue Date: 13 December 2022

Cite this article:

Yu-Chao Wang,Tian-Tian Li,Li Huang, et al. Fabrication of bimetallic Cu–Zn adsorbents with high dispersion by using confined space for gas adsorptive separation[J]. Front. Chem. Sci. Eng., 2022, 16(11): 1623-1631.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-022-2202-y
https://academic.hep.com.cn/fcse/EN/Y2022/V16/I11/1623

Fig.1 Formation of (a) aggregated CuO and ZnO via the conventional preparation process and (b) highly dispersed CuO and ZnO by using the confined space in AS.

Fig.2 Low-angle XRD patterns of CS, Cu–Zn–AS, and Cu–Zn–CS.

Fig.3 Wide-angle XRD patterns of CS, Cu–Zn–AS, and Cu–Zn–CS.

Tab.1 Textual parameters of the samples CS, Cu–Zn–AS, and Cu–Zn–CS

Fig.4 (a) N₂ adsorption−desorption isotherms and the corresponding (b) pore size distributions of CS, Cu–Zn–AS, and Cu–Zn–CS (Curves were plotted offset for clarity).

Fig.5 Bright-field and dark-field TEM images as well as elemental mapping of the samples (a) 3Cu–3Zn–AS and (b) 3Cu–3Zn–CS.

Fig.6 (a, c, e) TG and (b, d, f) DTG curves of Cu–Zn–AS and Cu–Zn–CS before calcination.

Fig.7 Infrared spectra of Cu–Zn–AS and Cu–Zn–CS (a) before and (b) after calcination.

Fig.8 Adsorption isotherms of C₃H₆ and C₃H₈ over the samples (a, c, e) Cu–Zn–AS and (b, d, f) Cu–Zn–CS.

Fig.9 Selectivity of C₃H₆ over C₃H₈ on the samples (a) 3Cu–3Zn–AS and 3Cu–3Zn–CS, (b) 5Cu–5Zn–AS and 5Cu–5Zn–CS, and (c) 7Cu–7Zn–AS and 7Cu–7Zn–CS.

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