Sulfur recovery catalyst

This post was last edited by Shandong Huaxing on 2010-7-21 at 22:34. Oxygen leakage may be due to the gas entering the reactor containing a higher oxygen content than designed. Ordinary aluminum oxide catalysts are subject to sulfation damage caused by residual oxygen in the process gas, which affects the efficiency of the reaction and reduces the catalyst’s lifespan; the use of this type of catalyst can extend its service life. This type of catalyst is slightly more expensive; it is generally filled in the upper part of the first reactor section, at a volume corresponding to 1/3 to 1/2 of that section’s capacity, while the rest uses ordinary catalysts. Such catalysts are already available in the country, and we have used them as well; the results were average. It should be noted that during sulfur scavenging while the vehicle was parked, this catalyst bed was prone to overheating; the supports at the lower part of the bed were burned and deformed, causing them to sink.

This post was last edited by Shandong Huaxing on 2010-7-21 at 22:35. In a normal Claus reaction, it is not allowed to introduce O2 into the reactor, because the presence of O2 – that is, oxygen leakage – will cause the catalyst to be oxidized and degraded, which is a major reason for catalyst deactivation. Oxygen leakage mainly occurs due to the improper selection of burners. The so-called oxygen leakage prevention catalyst is based on a normal aluminum oxide catalyst, with a small amount of divalent Fe ions added to it. When oxygen leakage occurs in the system, this catalyst containing divalent Fe ions can react with oxygen first, thereby protecting the catalysts that follow.

I finally understand what oxygen leakage is all about; this post ended up at the bottom, so I’m posting it here for everyone to see.

This post was last edited by Shandong Huaxing on 2010-7-20 at 21:03. The usual catalyst is alumina; the catalyst you mentioned is titanium oxide, which is not sensitive to oxygen that leaks into the system. Its price is much higher than that of alumina.

This post was last edited by Shandong Huaxing on 2010-7-21 at 22:37. Once oxygen leakage occurs, alumina-based catalysts react with SO2 and O2 present in the process gas to form aluminum sulfate, which leads to a decrease in the catalyst’s activity. In contrast, titanium-based catalysts do not react with SO2 and O2 in the process gas, so they do not suffer from sulfation; hence, titanium-based catalysts possess resistance to poisoning caused by oxygen leakage.