Pt-Ni alloy nanobead chains catalysts embedded in UiO-67 membrane for enhanced CO2 conversion to CO

Fossil fuel depletion and carbon dioxide (CO2) emission have driven worldwide research on alternative processes for the production of commodity chemicals. The high-efficiency catalysts can convert CO2 into high value-added products. Herein, the nanocable catalysts Pt-Ni@UiO-67 were assembled using Pt-Ni alloy nanobead chains as core in UiO-67: a UiO-67 membrane growing along their outer edge. The nanocable structure can inhibit agglomeration and sintering of the nanobead chains to improve catalytic activity. The conversion of CO2 to CO reached 25.8% for Pt3Ni@UiO-67 with a 13.2 nm-UiO-67 membrane, 12.3% for physically mixed Pt3Ni/UiO-67, and 10.8% for Pt3Ni@UiO-67(52.1) with a 52.1 nm-UiO-67 membrane, demonstrating that an appropriate thickness of the UiO-67 membrane in Pt3Ni@UiO-67 can enhance CO2 conversion to CO. Density functional theory calculations suggested that high CO2 conversion is associated with highly dispersed Ni. This work provides a feasible strategy for improving catalyst performance. (c) 2022 Elsevier Ltd. All rights reserved.

Automated summary

This study demonstrates a feasible strategy for converting CO2 into CO using nanocable catalysts Pt-Ni@UiO-67, and the catalytic performance can be improved by adjusting the thickness of the UiO-67 membrane. The results show that an appropriate thickness of the UiO-67 membrane can enhance CO2 conversion.