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利用热力学计算方法分析了铜基低温变换催化剂硫中毒的热力学可能性。根据非均相反应体系的熟力学有关理论,计算了COS、CS_2、H_2S和SO_2等4种含硫气体,在低温水汽变换温度条件下(423.15 K~573.15 K),导致铜基低温变换催化剂中毒可能发生的化学反应,并分析中毒产物。结果表明:在COS或H_2S气氛下,中毒产物主要是Cu_2S,其次是CuS:而在CS_2或SO_2气氛下,除了Cu_2S和CuS外,还可生成CuCO_3、CuSO_4。由热力学计算可知,这4种含硫气体对铜基低温变换催化剂的毒害作用由强至弱的顺序为CS_2>SO_2>COS>H_2S。
Thermodynamic calculation method is used to analyze the thermodynamic possibility of sulfur poisoning of Cu-based low temperature shift catalyst. According to the familiar theory of heterogeneous reaction system, four kinds of sulfur-containing gases such as COS, CS_2, H_2S and SO_2 were calculated. Under low temperature water-vapor transformation temperature (423.15 K ~ 573.15 K), copper-based low temperature shift catalyst poisoning Possible chemical reactions, and analysis of toxic products. The results showed that under the atmosphere of COS or H 2 S, the poisoning products were mainly Cu 2 S, followed by CuS. In the atmosphere of CS 2 or SO 2, in addition to Cu 2 S and CuS, CuCO 3 and CuSO 4 could be formed. From the thermodynamic calculation, it can be seen that the poisoning effect of the four sulfur-containing gases on copper-based low-temperature shift catalysts from strong to weak is CS_2> SO_2> COS> H_2S.