PdRu Bimetallic Nanoparticles/Metal-Organic Framework Composite through Supercritical CO2-Assisted Immobilization

Kiyoshi Matsuyama; Takumi Matsuoka; Masashi Eiro; Takafumi Kato; Tetsuya Okuyama

doi:10.1021/acsomega.4c01401

PdRu Bimetallic Nanoparticles/Metal-Organic Framework Composite through Supercritical CO₂-Assisted Immobilization

ACS Omega. 2024 Apr 23;9(18):20437-20443. doi: 10.1021/acsomega.4c01401. eCollection 2024 May 7.

Authors

Kiyoshi Matsuyama¹, Takumi Matsuoka¹, Masashi Eiro¹, Takafumi Kato², Tetsuya Okuyama³

Affiliations

¹ Department of Life, Environment and Applied Chemistry, Fukuoka Institute of Technology, 3-30-1 Wajiro-higashi, Higashi-ku, Fukuoka 811-0295, Japan.
² Department of Chemical Engineering, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan.
³ Department of Collaborative Interdisciplinary Engineering Sciences, Kyushu University, 6-1 Kasuga-koen, Kasuga-Shi, Kasuga 816-8580, Japan.

Abstract

Metal-nanoparticle (NP)/metal-organic framework (MOF) composites have attracted considerable attention as heterogeneous catalysts. Compared with porous carbon, silica, and alumina, the charge-transfer interaction between the metal NPs and the MOF accelerated the catalytic activity. In this study, PdRu bimetallic NPs were successfully immobilized on MOFs such as MIL-101(Cr) by using supercritical carbon dioxide. The STEM-EDX images show a uniform 3D distribution of the PdRu bimetallic NPs on MIL-101(Cr). The resulting PdRu@MIL-101(Cr) catalyst exhibited higher CO oxidation than monometal/MOF composites such as Pd@MIL-101(Cr) and Ru@MIL-101(Cr). Furthermore, PdRu@MIL-101(Cr) exhibited higher catalytic activity than PdRu@SiO₂. This is because the particle size of the PdRu bimetallic NPs in MIL-101(Cr) was within the range of 2-3 nm. The synergistic effects were based on the combination of two metals, Pd and Ru, small bimetal particle formation, and charge-transfer interactions between the bimetal NPs and the MOF. These factors enhance the catalytic activity of the bimetal/MOF composites.