Rare earth hydroxide catalyst for moderate/low temperature carbonyl sulfur hydrolysis and preparation method thereof

Abstract

The invention discloses a rare-earth hydrogen oxidation relic catalyst for the hydrolysis of carbonyl sulfide at a medium and low temperature and a preparation method thereof. The catalyst of the present invention is rare earth hydroxide, and its chemical molecular formula is: RE(OH)3, wherein RE represents La, Pr, Nd, Sm, Eu, Gd. Compared with the existing COS hydrolysis catalyst, the catalyst of the present invention has the advantages of high medium and low temperature activity, large operating flexibility, good resistance to oxygen and sulfur, simple and convenient preparation method and the like. When the concentration of O2 contained in the feed gas is less than 2%, it has no effect on the catalyst activity; and when the feed gas contains both O2 and H2S, the effect on the catalyst activity is negligible.

Description

technical field [0001] The invention belongs to a catalyst for removing organic sulfur, in particular to a catalyst for hydrolysis of carbonyl sulfide and a preparation method thereof. Background technique [0002] Carbonyl sulfide (COS) widely exists in the chemical production process using coal, natural gas and petroleum as raw materials. Its existence not only pollutes the environment, but also causes catalyst poisoning, equipment corrosion and product quality degradation in the subsequent production process. COS hydrolysis is the most practical method for removing organic sulfur, the process is: COS+H 2 O→CO 2 +H 2 S, under the action of a hydrolysis catalyst, use the water vapor in the tail gas or raw gas to convert COS into easier-to-handle inorganic hydrogen sulfide, and finally recover the sulfur element in the form of sulfur. [0003] U.S. Patent USP 4,455,446 discloses a 2 o 3 The disadvantage of the COS hydrolysis catalyst supported on platinum chloride is th...

AI Technical Summary

Problems solved by technology

[0003] USP 4,455,446 discloses a γ-Al 2 o 3 The COS hydrolysis catalyst loaded with platinum chloride has the disadvantage of high catalyst cost and the need for periodic regeneration

[0005] Chinese patent CN 1069673 discloses a normal temperature organosulfur hydrolysis catalyst, which is made of spherical γ-Al 2 o 3 On load 2-5% K2CO 3 , the disadvantage of this catalyst is that the COS content and space velocity of the raw gas processed are relatively low, respectively 1-5mg / m 3 and 2,000hr -1

[0007] Chinese patent CN 1134312 discloses a kind of by 4-20wt% TiO 2 and γ-Al 2 o 3 Composed of organosulfur hydrolysis catalysts, the disadvantage of this catalyst is that the space velocity is only 1,800hr -1

[0008] Chinese patent CN 1189394 discloses a COS hydrolysis catalyst at normal and low temperature, which is composed of (NH4) 6 Mo 7 o 24 ·H 2 O and K 2 CO 3 and low-density spherical γ-Al 2 o 3 The catalyst is composed of a carrier, and the catalyst also has the disadvantages of raw gas COS content and low space velocity.

[0010] The catalysts invented above all use aluminum oxide or titanium oxide as the main active component. The disadvantages of these catalysts are: (1) the reaction temperature range of COS hydrolysis is narrow, and the space velocity of the feed gas is low; (2) when the feed gas Exist O 2 and SO 2 When , the catalyst is easily poisoned by surface sulfation, resulting in a decrease in activity

However, the disadvantage of this catalyst is that when the reaction temperature is lower than 100 ° C, the activity is low

Images