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以介孔二氧化硅SBA-15为载体,丙基巯基三甲氧基硅氧烷为接枝剂,H_2O_2为巯基氧化剂制得表面磺酸改性固体酸催化剂SBA-15-pr-SO_3H。利用小角XRD、TEM、红外光谱、酸量测定等手段对合成的催化剂进行表征。将其应用于乙二胺四甲叉膦酸的多相催化反应。在低温80℃和催化剂摩尔质量为0.5 g/mol的条件下反应3 h,乙二胺四甲叉膦酸的转化率达86%,且5次重复使用的催化性能无明显下降。
The mesoporous silica SBA-15 was used as carrier, propyl mercaptotrimethoxy siloxane as grafting agent and H 2 O 2 as sulfhydryl oxidant to prepare surface sulfonic acid modified solid acid catalyst SBA-15-pr-SO 3 H. The synthesized catalyst was characterized by means of small angle XRD, TEM, IR, acid number measurement. It is applied to the heterogeneous catalysis of ethylenediamine tetramethylenephosphonic acid. Under the conditions of low temperature of 80 ℃ and catalyst molar mass of 0.5 g / mol for 3 h, the conversion of ethylenediaminetetramethylene phosphonic acid reached 86%, and the catalytic performance of five repeated uses showed no significant decrease.