ZnCl_2改性活性炭负载磷钨酸催化氧化NMST制备NMSBA

Production of NMSBA from NMST Catalyzed by Co/Mn/Br and HPW@C Modified with ZnCl_2 Solution

[目的]提高活性炭负载磷钨酸(HPW@C)催化氧化2-硝基-4-甲砜基甲苯(NMST)制备2-硝基-4-甲砜基苯甲酸(NMSBA)的催化能力。[方法]使用ZnCl_2对HPW@C催化剂进行改性,找出最佳改性条件并探究原因。[结果]在浓度为0.10 mol/L的ZnCl_2溶液中浸渍6 h,并在600℃下活化4 h的活性炭所制备的HPW@C催化剂催化氧化NMST制取NMSBA效果最佳。反应90 min时,最佳改性条件下处理的活性炭所制备的HPW@C催化剂比未改性的催化剂NMSBA的浓度提升10.68%。[结论]ZnCl_2改性后的活性炭所制备的HPW@C催化剂,提高了HPW@C催化氧化NMST制取NMSBA的能力。BET和Boehm数据显示,活性炭表面积的增加以及酸性官能团的提高增强了催化剂的催化能力,其中介孔在催化氧化NMST制取NMSBA中起到重要的作用。

[Aims] Improve the catalytic ability of phosphotungstic acid（HPW） loaded on activated carbon（HPW@C）for the oxidation of 2-nitro-4-methylsulfonyltoluene（NMST） to 2-nitro-4-methylsulfonylbenzoic acid（NMSBA）.[Methods] Treat HPW@C catalyst with Zn Cl2 solution, find out the best modification conditions and explore the reason.[Results] The best modification condition with Zn Cl2 solution is impregnating the carbon sample in 0.1 mol/L solution for 6 h followed by calcination at 600 ℃ for 4 h. [Conclusions] The catalytic ability of the HPW@C catalyst in the oxidation of NMST to NMSBA carbon sample can be improved by treating the activated carbon with Zn Cl2 solution and the increase of the surface area and the acidic groups on the carbon surface enhances the catalytic ability of the catalyst. The mesopores play an important role in the catalytic oxidation of NMST to NMSBA.