The clean synthesis of furfural oxime (FO) has been realized through titanosilicate-catalyzed liquid-phase ammoximation of furfural with ammonia and hydrogen peroxide. A detailed investigation of furfural ammoximation over three representative titanosilicates Ti-MOR, TS-1 and Ti-MWW reveals that the reaction involves the hydroxylamine route and the imine route. The hydroxylamine route accounts for the formation of the target product (FO), while the imine route leads to the formation of undesired products such as 2-furylamide and 2-furoic acid. With a high efficiency for hydroxylamine formation, Ti-MOR proves to be superior to TS-1 and Ti-MWW. The catalytic performance of Ti-MOR depends greatly on the operating conditions of the reaction, which is closely related to its activity in catalyzing hydroxylamine decomposition. The decomposition of hydroxylamine and the non-catalytic oxidation of furfural can be effectively suppressed in Ti-MOR-catalyzed ammoximation when employing water as the solvent and adding H₂O₂ dropwise into the reaction system. Under optimized conditions, Ti-MOR is capable of providing furfural conversion and oxime selectivity both above 97%.

中文翻译：

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在钛硅酸盐催化剂上通过糠醛的液相氨氧化反应合成糠醛肟

糠醛肟（FO）的清洁合成已通过钛硅酸盐催化的氨水和过氧化氢催化糠醛的液相氨肟化来实现。对三种代表性的钛硅酸盐Ti-MOR，TS-1和Ti-MWW进行糠醛氨氧化反应的详细研究表明，该反应涉及羟胺途径和亚胺途径。羟胺途径导致目标产物（FO）的形成，而亚胺途径导致不期望的产物例如2-呋喃酰胺和2-糠酸的形成。Ti-MOR具有很高的羟胺形成效率，被证明优于TS-1和Ti-MWW。Ti-MOR的催化性能在很大程度上取决于反应的操作条件，这与它在催化羟胺分解中的活性密切相关。_将2 O ₂滴加到反应系统中。在最佳条件下，Ti-MOR能够提供高于97％的糠醛转化率和肟选择性。