The damage of arsenic trioxide (As₂O₃) to catalysts in flue gas acid production
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The damage of arsenic trioxide (As₂O₃) to catalysts in flue gas acid production: Arsenic trioxide (As₂O₃) forms non-volatile As₂O₅ on the surface of the catalysts; this substance covers the catalyst surface and reduces the conversion rate； When the flue gas temperature is above around 550°C, As₂O₃ and V₂O₅ in the flue gas form volatile compounds; these volatiles subsequently condense on the surfaces of the catalysts in layers two, three, and four of the conversion bed. A layer of black substance forms on the catalyst surfaces, causing catalyst poisoning. This also leads to catalyst caking, a decrease in catalyst activity, an increase in bed resistance, and ultimately a reduction in the system’s conversion rate.
【Ten Years of Rapid Development in Chemical Processing Equipment】The world’s first batch of coal tar obtained through in-situ underground pyrolysis was successfully extracted in northern Shaanxi from 2022 to 2024. https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=5714009 (Source: Haimen Chemical Industry Forum (HCBBS))