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利用HSC热力学软件对Cu/Zn O/Al_2O_3甲醇合成催化剂As H_3中毒热力学进行了计算。分析了在150°C~300°C的合成温度下催化剂可能发生的化学反应,并比较各自发反应的化学平衡常数。结果表明:合成原料气组分(CO、H_2O、N_2、O_2)能引起催化剂砷中毒。其中,O_2对催化剂砷中毒的影响最大,参与反应的热力学竞争力最强,产物Cu_3As、As_2O_5、As_2O_3和Cu_3(AsO_4)_2可能导致催化剂失活。为应对砷中毒,应在合成反应之前深度净化合成气。
The thermodynamics of As H 3 poisoning of Cu / Zn O / Al 2 O 3 methanol synthesis catalyst was calculated by HSC thermodynamic software. The possible chemical reactions of the catalyst at the synthesis temperature of 150 ° C ~ 300 ° C were analyzed and the chemical equilibrium constants of each reaction were compared. The results show that the synthesis of feed gas components (CO, H_2O, N_2, O_2) can cause arsenic poisoning. Among them, O_2 had the greatest influence on arsenic poisoning, and the thermodynamics of the reaction was the most competitive. The products Cu_3As, As_2O_5, As_2O_3 and Cu_3 (AsO_4) _2 could cause deactivation of the catalyst. In response to arsenic poisoning, syngas should be thoroughly purged prior to the synthesis reaction.