纳米氧化铈在催化氧化木质素制备芳香化合物中的应用研究

木质素是自然界中唯一大规模可再生的含芳环聚合物.通过催化氧化的方法,定向解聚木质素得到芳香类化合物,具有非常重要的价值.近年来,氧化铈作为载体在木质素的多相催化氧化反应中表现较好性能.然而,对于氧化铈直接作为催化剂,并探讨其纳米结构与性能之间的研究未见报道.研究结果表明:纳米氧化铈直接作为催化剂时,对于木质素的催化氧化反应具有较好的性能,顺序为氧化铈纳米八面体纳米四方体纳米球纳米棒.纳米八面体表现出最优的催化性能,以其作为催化剂,对乙醇木质素进行催化氧化,得到了大量芳香酸及其酯类化合物.

Applied Research of Nano Cerium Oxide in the Catalatic Oxidation of Preparing Aromatic Compounds from Lignin

Aromatic compounds is indispensable for the chemical industry. Producing aromatic compounds via non-oil and no-coal route can fundamentally solve the problems of resource shortage and environmental pollution. Lignin is the only renewable and large-scale resource in nature that cotains aromatic ring. Therefore, it is very important to research the catalytic oxidation of lignin to prepare aromatic compounds. In recent years, it is noted that cerium oxide has excellent perform in the multi-phase catalytic oxidation reactions of lignin. However, the study of directly using cerium oxide as a catalyst, and the study of relationship of nanostructure and catalytic performance of cerium oxide has not been reported. Based on it, this paper studies the structure-activity relationship of nano constitutive effect of cerium oxide with different morphology. The results show that the catalytic oxidation performance of cerium oxide is nanooctahedral > nanocubes > nanospherical > nanorods. The cerium oxide octahedral shows the best catalytic performance, therefore, it was adopted as a catalyst in the catalytic oxidation of lignin, and a large number of aromatic acids and their esters were obtained.