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Số người truy cập: 52,740,206

 Macroscopic graphite felt containing palladium catalyst for liquid-phase hydrogenation of cinnamaldehyde
Tác giả hoặc Nhóm tác giả: Zhenxin Xu, Cuong Duong-Viet, Yuefeng Liu, Walid Baaziz, Bing Li, Lam Nguyen-Dinh, Ovidiu Ersen, Cuong Pham-Huu
Nơi đăng: Applied Catalysis B: Environmental; Số: 244;Từ->đến trang: 128–139;Năm: 2019
Lĩnh vực: Khoa học công nghệ; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
Developing of both effective and stable noble metal nanoparticle (NPs) catalysts with easy catalyst-product recovery is still challenging in the liquid-phase catalytic processes. Here, we report on the synthesis of a hierarchical structured catalyst that consisted of oxygen functionalized graphite felt (OGF) support for liquid-phase processes. The monolith palladium-based catalyst was used as catalytic stirrer and displays excellent stability as well as complete recyclability for liquid-phase hydrogenation of α, β-unsaturated cinnamaldehyde. The surface defects decorated with abundant oxygenated groups as well as highly accessible porous structure generated from the acid treatment of carbon support, construct a bridge between Pd and support providing the charge transfer to alter the metal-support interactions. The electron-deficient high-valent Pdδδ+ species, formed on the metal NPs, and defects on the support help to enhance the Pd dispersion and resistance to sintering and/or aggregation during both catalyst preparation and cycling tests, leading to the high and stable hydrogen dissociative adsorption for hydrogenation process
ABSTRACT
Developing of both effective and stable noble metal nanoparticle (NPs) catalysts with easy catalyst-product recovery is still challenging in the liquid-phase catalytic processes. Here, we report on the synthesis of a hierarchical structured catalyst that consisted of oxygen functionalized graphite felt (OGF) support for liquid-phase processes. The monolith palladium-based catalyst was used as catalytic stirrer and displays excellent stability as well as complete recyclability for liquid-phase hydrogenation of α, β-unsaturated cinnamaldehyde. The surface defects decorated with abundant oxygenated groups as well as highly accessible porous structure generated from the acid treatment of carbon support, construct a bridge between Pd and support providing the charge transfer to alter the metal-support interactions. The electron-deficient high-valent Pdδδ+ species, formed on the metal NPs, and defects on the support help to enhance the Pd dispersion and resistance to sintering and/or aggregation during both catalyst preparation and cycling tests, leading to the high and stable hydrogen dissociative adsorption for hydrogenation process
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