在交联柱撑皂土催化下，应用硝酸硝化甲苯，能提高甲苯的对位选择性硝化能力，邻对硝基甲苯比例较通常硝硫混酸方法硝化邻对位产物比例(1.67)显著降低。在所制备的NH+4、H+、La3+等系列改性铝交联柱撑皂土催化剂中，稀土La3+改性交联柱撑皂土具有较好的催化选择性和活性，邻对硝基甲苯比例达到0.75。%Para-selectivities oi toluene nitrations were enhanced by using nitric acid as nitrating agent in the presence of cross-linked pillared bentonite catalysts.Ortho-to-para ratios were greatly below 1.67 as compared with sulfonitric acid.Of a range of NH+4、H+、La3+ modified aluminium cross-linked bentonites,La3+ modiried bentonite appears to be the optimum catalytic selectivity and reactivity,up to 0.75 in a ratio of ortho and para nitrotoluene.
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