有机铝-SiO₂型类气凝胶催化剂基材的制备工艺优化及其有机吸附性能研究

Optimization of the Preparation Process of Organoaluminum-SiO₂ Aerogel Catalyst Substrate and Its Organic Adsorption Performance

摘要: 本文研究了有机铝-SiO₂型类气凝胶催化剂基材制备的原料配比与催化剂基材成型度之间的关系，分析了该催化剂基材的结构特征，并探讨了不同配方制备的催化剂基材对有机物的吸附特征。结果表明，原料中对催化剂基材成型的主要影响因素为氯化铝与间苯三甲酸钠，次要影响因素为硅酸钠量。最佳成型配比为氯化铝2.41 g/100 mL (H₂O)，硅酸钠3.66 g/100 mL (H₂O)，间苯甲酸钠2.84 g/100 mL (H₂O)。该催化剂基材呈现较明显的絮状、多孔的三维结构，并且对亚麻油的吸附量为3021 mg/g。另外，当间苯三甲酸钠浓度在2.1~2.7 g/100 mL (H₂O)范围内，硅铝加入量在21~63 mL范围内生成的催化剂基材有较好的有机物吸收性能。

Abstract: The relationship between the ratio of raw materials and the molding degree of the Organic Al-SiO₂ aerogel catalyst substrate was studied, and the structural characteristics of the catalyst substrate were analyzed, its additive property to linseed oil was studied. The results show that the main factors affecting the forming of catalyst substrate are aluminum chloride and sodium isophthalate, and the secondary factors are sodium silicate. The best molding ratio was aluminum chloride 2.41 g/100 mL (H₂O), sodium silicate 3.66 g/100 mL (H₂O), sodium isobenzoate 2.84 g/100 mL (H₂O). The catalyst has a three-dimensional structure of flocculation and porosity, and the adsorption capacity of linseed oil is 3021 mg/g. In addition, when the concentration of sodium isophthalate is in the range of 2.1~2.7 g/100 mL (H₂O) and the addition of Si-Al is in the range of 21 mL ~ 63 mL, the catalyst substrate has good organic absorption performance.