从硫化氢气体分解制取氢气和硫磺——Ⅰ.催化热解反应

Recovery of Hydrogen and Sulfur from Decomposition of Hydrogen Sulfide Ⅰ. Thermal Decomposition of Hydrogen Sulfide over Catalysts

以连续流动进气系统和Pyrex玻璃管反应器,在450～600℃的温度下,研究了H_2S催化热解为H_2和S的反应。采用浸渍法和干混法制备了V_2O_5/Al_2O_3、MoO_3/Al_2O_3、V_2O_5/TiO_2、V_2O_5/SiO_2以及Cu/Al_2O_3等一系列催化剂,研究了各种催化剂在反应中的产氢率随反应时间,反应温度及H_2S流速变化的规律。用冰水冷阱回收硫磺,并用二乙醇胺溶液吸收尾气中未反应的H_2S,可以得到高纯度的氢气。结果表明,浸渍法制备的催化剂亦可用于H_2S催化热解为H_2和S的反应。最佳催化剂的组成为:20%V_2O_5+12%MoO_3/Al_2O_3,在600℃下所得产氢率为4.05%。

The catalytic thermal decomposition of hydrogen sulfide to hydrogen and sulfur was studied in a continuous flow system using Pyrex tube reactor at 450～600℃. A series of catalysts were prepared by impregnating and mixturing methods. Hydrogen yield was measured as a function of time and temperature of the reaction. The results show that the catalyst prepared by impregnating method is also efficient in the decomposition reaction of H_2S to H_2 and S. A cold trap was used for recovering sulfur and diethanolamine aqueous solution for absorpting unreacted hydrogen sulfide in order to obtain high purity hydrogen. The optimal hydrogen yield (4.05%) was obtained by using 20%V_2O_5+12%M_oO_3/Al_2O_3 catalyst at 600℃.