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An approach to stabilize Pd nanoparticles by using nitrogen-doped carbon support prepared using F127 as a stabilizer and chitosan as a carbon/nitrogen source is presented. The developed heterogeneous Pd catalyst (Pd/NCF) is efficient and recyclable for oxidative carbonylation of phenol to diphenyl carbonate, exhibiting higher stability than that of Pd/NC catalyst without F127. Enhanced hydrogen bonding between chitosan and F127 increases N content of the carbon support and thus improves metal dispersion. Limited leaching of Pd nanoparticles by increased metal-support interaction and the stabilizing of Pd2+ species by pyridine N simultaneously endow the catalyst with excellent stability. (See Xiaojing Liu et al., Pages 19-28)
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The schematic diagram illustrates an economic and environmentally friendly method for synthesizing hierarchical NaX zeolite that exhibits improved catalytic performance in the Knoevenagel condensation reaction for producing the useful fine chemical 2-cyano-3-phenylacrylate. This hierarchical NaX zeolite is synthesized using natural kaolinite as the starting material without any template or seeds. Owing to its mesoporous structure and smaller crystal size, this hierarchical NaX zeolite exhibits the excellent catalytic performance in Knoevenagel condensation between benzaldehyde and ethyl cyanoacetate. (See Wen Xiao et al., Pages 75-84)
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An approach to stabilize Pd nanoparticles by using nitrogen-doped carbon support prepared using F127 as a stabilizer and chitosan as a carbon/nitrogen source is presented. The developed heterogeneous Pd catalyst (Pd/NCF) is efficient and recyclable for oxidative carbonylation of phenol to diphenyl carbonate, exhibiting higher stability than that of Pd/NC catalyst without F127. Enhanced hydrogen bonding between chitosan and F127 increases N content of the carbon support and thus improves metal dispersion. Limited leaching of Pd nanoparticles by increased metal-support interaction and the stabilizing of Pd2+ species by pyridine N simultaneously endow the catalyst with excellent stability. (See Xiaojing Liu et al., Pages 19-28)
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In this work, a green and novel route to dimethyl succinate (DMS) was established, which was by direct esterification of bio-based disodium succinate using CO2 and CH3OH without using strong inorganic acids. DMS is an ideal polymer precursor to synthesize poly (butylene succinate), its large production with low cost and environment benignity could relieve the dramatically demand for biodegradable plastics. Moreover, CO2 adoption instead of inorganic acids in the reaction would be in accord with green and sustainable development concept. (See Yu-Gao Wang et al., Pages 188–195)
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2024年 第65卷 第1期 刊出日期:2024-01-28
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