Abstract
The thermodynamics of copper-based water-gas shift catalyst for yellow phosphorus off-gas have been calculated according to the thermodynamic theory of heterogeneous reaction systems. The possible chemical reactions and products were analyzed and are discussed here. The results show that AsH3 and S-containing gaseous impurities (H2S, COS, CS2, and SO2) in the yellow phosphorus off-gas can preferentially lead to active CuO poisoning of the catalyst, and the poisoning products are Cu3As and Cu2S. Small amounts of PH3 and P4 were the main cause of the inactivation of the anti-toxic component (ZnO) and the support (Al2O3) in the catalyst. The inactive products were Zn3(PO4)2 and AlPO4, respectively. If yellow phosphorus off-gas is used as the raw material gas for water-gas shift reaction, the As-, S- and P-containing gaseous impurities should be removed to avoid catalyst poisoning.
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