采用热分解法制备纳米SnO₂，并运用浸渍法制备Pd—Cu负载在SnO₂ 上的双金属纳米负载型催化剂．对纳米SnO2进行x射线衍射、透射电镜、比表面积分析；以甲酸为还原剂，在常压下考察了纳米Pd．Cu／SnO ₂催化还原硝酸盐氮的活性和选择性．结果表明：制备的纳米SnO₂ 的晶粒粒径为8．9～10．4nm或9．3～10．7nm，颗粒粒径在10．0nm左右。BET比表面积最大为144．9892m² ／g；催化还原硝酸盐氮的Pd—Cu配比为6：1，甲酸的投加量为16．0mmol／L时，硝酸盐氮的去除率为100．00％，催化活性达到0．119mmol／（min·g），总氮的去除率为76．23％，反应的最佳pH值为4．0．

Nano-sized SnO₂ and bimetallic Pd-Cu/SnO₂  catalysts were successfully prepared via the thermal decomposition method and the impreganation method, respectively. Then, the nano-sized SnO₂ was characterized by means of XRD, TEM and specific surface area analyzer, etc. , and the catalytic reduction activity and selectivity of the nano-sized Pd-Cu/SnO₂  for nitrate nitrogen were analyzed at atmospheric pressure, with formic acid as the reducing agent. The results show that （ 1 ） the prepared nano-sized SnO₂ is of a crystalline size of about 8.9 10. 4 nm or 9.3- 10. 7 nm, with a particle size of about 10. 0 nm and a BET specific surface area being up to 144. 9892m² /g; and that, in the catalytic reduction of nitrate at a Pd-to-Cu ratio of 6：1 and a formic acid dosage of 16. 0mmol/L, nitrate is completely reduced; 76.23% of the total nitrogen is removed; the catalytic activity reaches 0. ll9mmoL/（min· g） ; and the optimal pH value is 4.0