硼、钾改性KX沸石上甲苯和甲醇的侧链烷基化反应

研究了硼、钾改性ＫＸ沸石催化剂的甲苯侧链烷基化反应性能。结果表明，硼和钾同时改性可显著地提高甲苯侧链烷基化反应活性，Ｈ３ＢＯ３和ＫＯＨ在催化剂样品浸渍过程中形成了不同化学计量比的碱金属硼酸盐，该硼酸盐在沸石上作为新的碱性中心而有利于醇的催化脱氢。实验发现，各样品的甲苯侧链反应产物收率与异丙醇分解产物丙酮选择性之间有较好的关联。此外，酸碱中毒试验也进一步证实碱性位在反应中起主要作用

SIDE-CHAIN ALKYLATION OF TOLUENE WITH METHANOLON B AND K MODIFIED KX ZEOLITES

The catalytic performance of side-chain alkylation of toluene with methanol over H3BO3 and KOH modified KX zeolite catalysts is inverstigated It is shown that the highest activity for side-chain alkylation is obtained on the KX zeolites modified simultaneously with B and K compounds The results suggested that different stochiometric borate compounds (K2B4O7( x H2O) and KBO2( x H2O)) are formed between H3BO3 and KOH under impregenation conditon, which can act as a new basic active sites of medium strength for the effectively catalytic dehydrogenation of methanol Meanwhile, basicity of the catalysts was measured by the decomposition of isopropanol into acetone and/or propene It is found that there is a good correlation between the yields of styrene and ethylbenzene ( YBZEB Sty) in the side-chain alkylation and selectivity of acetone (SelA) in the decomposition of isopropanol Otherwise, the reaction activity was decreased by poisoning of either acidic or basic sites, it is shown that both of acidic