RE sulfide catalyst for hydrolysis of carbonyl sulfide and its prepn

Abstract

The RE oxysulfide catalyst has the chemical expression of Re2O2S, where Re is La, Ce, Pr, Nd, Sm, Eu, Gd, Dy, Ho and Er. The preparation process of the catalyst includes hydrolysis of RE oxide and activation with the mixed gas of SO2 and CO at 400-700 deg.c. The catalyst has excellent hydrolysis effect on COS and other organic sulfide, certain sulfate resistance and oxygen poison resistance, and under the reaction condition including temperature 100-250 deg.c, COS content 150-300 ppm, space velocity 5,000-10,000 / Hr it results in a COS conversion rate higher than 90%.

Description

technical field [0001] The invention belongs to a catalyst for removing organic sulfur, in particular to a carbonyl sulfide hydrolysis catalyst 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, and its process is: <chemistry num="001"> <chem file="02137242_cml001.xml" / > < / chemistry> , 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 No. 4,455,446 discloses a γ-Al 2 o 3 The disadvanta...

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Problems solved by technology

[0003] US Patent 4,455,446 discloses a γ-Al 2 o 3 The COS hydrolysis catalyst loaded with platinum sulfide 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 2-5% K on load 2 CO 3 , the disadvantage of this catalyst is that the COS content and space velocity of the feed gas 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 (NH 4 ) 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 raw material gas is low; (2) when the raw material gas SO exists 2 and O 2 When , the catalyst is easily poisoned by surface sulfation, resulting in a decrease in activity