Chen Sibai

Bio: Chen Sibai is an academic researcher from Nanjing Tech University. The author has contributed to research in topics: Ceramic & Membrane. The author has an hindex of 1, co-authored 1 publications receiving 5 citations.

Pd Nanoparticles Loaded on Ceramic Membranes by Atomic Layer Deposition with Enhanced Catalytic Properties

Abstract: Atomic layer deposition (ALD) was adopted for the first time to load Pd nanoparticles on Al2O3 ceramic membranes (CMs) for fabricating catalytic membranes (Pd/CMs). The membrane surface was functio...

酸性Al 2 O 3 层包裹Pt纳米颗粒:增强的金属-酸性双功能协同效应提高其甘油氢解反应催化性能

Abstract: ABSTRACT Bifunctional catalysts that contain both metal and acidic functions have been widely used in renewable biomass conversions. The bifunctionality closely depends on the distance between the metal and acid sites. However, the metal–acid proximity effect has rarely investigated in biomass conversions. In this work, we precisely deposited a porous Al 2 O 3 overcoat onto a Pt/Al 2 O 3 catalyst using atomic layer deposition to improve the proximity between the Pt metal and the alumina acid sites by increasing the area of the metal–acid interface. Diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) of pyridine chemisorption confirmed that the overall catalyst acidity did not change considerably after applying the alumina overcoat. In the aqueous-phase, hydrogenolysis of glycerol was used to demonstrate that the alumina overcoat significantly improved the activity approximately 2.8-fold, as well as the selectivity to 1,2-propanediol (1,2-PD) at high conversions. DRIFTS measurements of CO chemisorption indicated that the Pt-alumina interface had greater area for alumina coated Pt/Al 2 O 3 than for the uncoated analog. Moreover, we used the hydrogenation of acetol, the key reaction intermediate in glycerol hydrogenolysis, as a control experiment to confirm that the observed activity improvement in the hydrogenolysis of glycerol could be attributed to the enhancement of the dehydration reaction step, which requires acidic function. In brief, our work provides solid evidence that close metal–acid proximity enhances bifunctionality, thus improving the catalytic activity.

Highly effective catalytic reduction of nitrobenzene compounds with gold nanoparticle-immobilized hydroxyapatite nanowire-sintered porous ceramic beads

Abstract: The development of high-performance catalysts for eliminating the negative effects of hazardous contaminants is highly desirable. In this study, a nanogold-immobilized catalyst based on hydroxyapatite nanowire (HN)-sintered porous ceramic beads with excellent catalytic performance in the reductive degradation of nitrobenzene compounds has been prepared. The high-aspect-ratio HN self-assembles into a network structure and acts as a building block for forming the porous ceramic beads with an interconnected porous architecture and high porosity features. The ceramic skeleton with enriched anchoring sites can offer enough traction to disperse the stable gold nanoparticles (AuNPs) during the catalytic reaction process. The prepared HN/AuNP beads are analyzed by several characterization methods and demonstrate unique properties, such as micron-sized and interconnected porous channels, adjustable porosity, and good distribution of AuNPs. In addition, the HN/AuNP beads exhibit high catalytic activity in the reductive degradation of 4-nitrophenol by sodium borohydride. The HN/AuNP beads can be recycled, retaining their original conversion efficiency at about 97% even after 15 consecutive reaction cycles. Besides, the HN/AuNP beads maintain high catalytic stabilities after several high-temperature heat treatment procedures. Furthermore, the highly effective catalytic reduction conversion of several nitrobenzene compounds into the corresponding amino derivatives is achieved. The developed porous ceramic beads can be used for supporting various nanocatalysts. These results demonstrate that the catalytic porous beads are promising for applications in water treatment and high-temperature catalysis fields.