Controllable synthesis of Pd@ZIF-L catalysts by an assembly method. Issue 26 (22nd February 2016)

• Record Type: Journal Article
• Authors: Jiang, Hong; Xue, Songlin; Liu, Yefei; Chen, Rizhi; Xing, Weihong
• Is Part Of: RSC advances. Volume 6:Issue 26(2016)
• Page Start: 21337
• Page End: 21344
• Publication Date: 2016-02-22
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra00909c
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Pd@ZIF-L catalysts with uniform morphology and better catalytic performance were fabricated by controlling the 2-MeIM/Zn 2+ and PVP/Zn 2+ molar ratios. Abstract : The Pd@ZIF-L catalysts with uniform crosshair-star shape and a size of about 20 μm were fabricated by an assembly method that enables the crystallization of ZIF-L in water with the presence of polyvinylpyrrolidone (PVP)-stabilized Pd nanoparticles (NPs). The physical and catalytic properties of the Pd@ZIF-L catalysts are greatly affected by the molar ratios of 2-methylimidazole (2-MeIM)/Zn 2+ and PVP/Zn 2+ . Their catalytic activities were evaluated by the catalytic reduction of p -nitrophenol to p -aminophenol. The results indicate that a lower molar ratio of 2-MeIM/Zn 2+ is beneficial for the increase of Pd loading and p -nitrophenol conversion, but a suitable molar ratio (≥20) of 2-MeIM/Zn 2+ is helpful to the crystallization of ZIF-L and the encapsulation of the Pd NPs within the ZIF-L framework. The Pd@ZIF-L catalyst synthesized at a lower PVP/Zn 2+ molar ratio has higher Pd loading and p -nitrophenol conversion due to the easy adsorption of PVP–Pd NPs onto the ZIF-L surfaces. This work would aid the development of high-performance Pd@ZIF-L catalysts.