毒化钯炭催化剂的制备及其在卤代芳香硝基化合物加氢中的应用

Halogenated aromatic amines are a kind of important organic intermediates, widely used in the synthesis of dyes, pharmaceuticals, pesticides, additives, etc... The synthesis of halogenated aromatic amines by iron powder reduction method, sulfide reduction method and catalytic hydrogenation method, the former will produce a lot of high concentration of organic waste water and sludge, etc... Catalytic hydrogenation is a clean production process, but there are a problem of high cost and dehalogenation. Therefore, how to improve the activity and stability of the catalyst and the selectivity of the aryl amine is the key. The subject of halogenated nitro compounds hydrogenation catalyst design and nitrogenous compounds poisoning of palladium carbon catalyst and by controlling the condition of poisoning, can prepare with high activity of PdH activity species, PdH species increased, greatly improve hydrogenation catalyst activity, selectivity and stability. The poisoning of the catalyst for halogenated nitrobenzene hydrogenation reaction, and can effectively inhibit hydrogen dehalogenation, and has very high catalytic activity and stability, in industrial production can effectively reduce the cost. Finally, the structure of catalysts were characterized and analyzed the mechanism of poisoning, It was proved more effective for promoting the industrialization of catalyst poisoning.

卤代芳胺是一类重要的有机中间体，广泛应用于染料、医药、农药、助剂等的合成。主要由铁粉还原法、硫化碱还原法和催化加氢法合成卤代芳胺。前者会产生大量的高浓度有机废水和污泥等。催化加氢法是清洁生产工艺，但存在氢解脱卤和催化剂使用成本高等难题。因此如何提高催化剂的活性、稳定性和卤代芳胺选择性是关键。本课题对卤代硝基物加氢催化剂进行设计，用含氮化合物毒化钯炭催化剂，通过控制毒化条件，能制备出具有高活性PdH活性物种，PdH物种的增加，大幅度提高加氢催化剂的活性、选择性和稳定性。毒化后的催化剂用于卤代硝基苯的加氢反应，能有效的抑制氢解脱卤，并且还具有很高的催化活性和稳定性，在工业化生产中可有效的降低成本。最后，我们对催化剂结构进行表征、并进行了毒化机理分析，为毒化催化剂推广工业化进行了更有力的佐证。

卤代芳胺是一类重要的有机中间体，广泛应用于染料、医药、农药、助剂等的合成。主要由铁粉还原法、硫化碱还原法和催化加氢法合成卤代芳胺。前者会产生大量的高浓度有机废水和污泥等。催化加氢法是清洁生产工艺，但存在氢解脱卤和催化剂使用成本高等难题。因此如何提高催化剂的活性、稳定性和卤代芳胺选择性是关键。本课题对卤代硝基物加氢催化剂进行设计，用含氮化合物毒化钯炭催化剂，通过控制毒化条件，能制备出具有高活性PdH活性物种，PdH物种的增加，大幅度提高加氢催化剂的活性、选择性和稳定性。毒化后的催化剂用于卤代硝基苯的加氢反应，能有效的抑制氢解脱卤，一般脱卤率可以控制在0.01%左右，并且还具有很高的催化活性和能多次套用，在工业化生产中可有效的降低成本。最后，我们对催化剂结构进行表征、并进行了毒化机理分析，为毒化催化剂推广工业化进行了更有力的佐证。