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ZnZrOx solid solution is a promising catalyst for the hydrogenation of CO2 to methanol, but precise design of the nanostructure to enhance catalytic performance remains a significant challenge. Herein, a ZnZrOx-based solid solution (ZnZrOx-MD) nanoparticle catalyst with uniform metal dispersion and remarkable CO2 activation ability was developed via calcination of metal–organic frameworks [MOFs, viz., PCN-223-(Zn)] with mixed metal (Zr and Zn) as solid precursors. It was found that the ZnZrOx-MD nanoparticle catalyst outperformed its counterparts prepared using a traditional deposition–precipitation method (ZnZrOx-TD). Furthermore, the effects of the micromorphology and crystal composition on the catalytic performance of ZnZrOx-MD were systematically investigated. Comprehensive characterization results reveal that ZnZrOx-MD contained abundant oxygen vacancies, large specific surface area, and uniform metal dispersion, which collectively contributed to its excellent CO2 hydrogenation performance, resulting in a high methanol selectivity of 77.2% at 320 °C. In situ DRIFTS experiments confirm the mechanism for the CO2 hydrogenation to methanol over the ZnZrOx nanoparticle catalysts involved the initial formation of HCOO* species, followed by subsequent hydrogenation to generate CH3O* and ultimately produce methanol. Overall, this work highlights the potential benefits of MOFs as thermal decomposition precursors for the fabrication of solid-state catalysts with unique properties. [ABSTRACT FROM AUTHOR]

A Supported gold catalyst was prepared by reduction of HAuCl4 with the Cacumen Platycladi extract. This catalyst was then used for oxidation of 2-phenylethyl alcohol in a model reaction. Our study evaluated the effect of various preparation conditions, including the Au loading ratio and calcination temperature. Additionally, we explored the influence of the reaction temperature and reaction time on the catalytic performance of a Au/TiO2 catalyst. Our experimental findings revealed notable results for the Au/TiO2 catalyst characterized by the Au loading of 1.3 wt % and calcinated at 400°C. Under specific reaction conditions (0.3 g catalyst, 220°C, 3.0 MPa, 2.5 h), the conversion of 2-phenylethyl alcohol reached 45.3 and a 59.6% selectivity and a 27.0% yield of the target product (phenylacetaldehyde). In addition, catalytic performance remained stable after 8 repeated uses. [ABSTRACT FROM AUTHOR]