Kwok, K. M. Y.; Chen, L. W.; Zeng, H. C., Design of hollow spherical Co@hsZSM5@metal dual-layer nanocatalysts for tandem CO2 hydrogenation to increase C2+ hydrocarbon selectivity. Journal of Materials Chemistry A 2020, 8 (25), 12757-12766
Abstract:
A thin hollow shell nanostructure can increase effectiveness of zeolites while allowing metal nanoparticles to be supported on both its inner and outer surfaces. Herein, nanoscale hollow spherical ZSM-5 (hsZSM5) shells were synthesized from sub-micron silica spheres through a dissolution–recrystallization mechanism with assistance of a positively charged polymer. The as-prepared hsZSM5 can function as a spacer: different metals (Mn) can be preferentially separated by the thin shell of hsZSM5, making the derived M1@hsZSM5@M2 suitable for tandem reactions. The dual-layer Co@hsZSM5@Pt shows higher resistance to metal sintering and alloying in tandem hydrogenation of CO2 (i.e.; reverse water gas shift reaction followed by Fischer–Trøpsch reaction) to short-chain hydrocarbons, which can be used as an alternate clean feedstock to produce chemicals such as olefins, aromatics and polymers. Hydrocarbon selectivity of C2+ can be increased up to 46% in Co@hsZSM5@Pt, which was not observed in co-impregnated Pt–Co catalyst.
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Funding Info:
This research / project is supported by the National University of Singapore - Flagship Green Energy Program (GEP)
Grant Reference no. : R-279-000-553-731
This research is supported by core funding from: Institute of Chemical and Engineering Sciences
Grant Reference no. :
This research / project is supported by the National Research Foundation, Singapore - Campus for Research Excellence and Technological Enterprise (CREATE) Program
Grant Reference no. : R-279-000-565-592
This work was also supported by the A*STAR Graduate Academy postgraduate scholarship of the Agency for Science, Technology and Research (A*STAR)