h with macroporous structure 2 Catalyst for producing sulfur by s selective oxidation and preparation method thereof

Abstract

A catalyst having a macro-porous structure and used for production of sulfur through selective oxidation of H2S adopts silica as a carrier and supported iron oxide as an active component, and comprises 5-20 mass% of Fe2O3; the edgewise compressive strength of the silica carrier is greater than 140N / cm, the specific surface area is 30-150m<2> / g, the pore volume is 0.5-0.9ml / g, and the volume of large pores with the diameter being 50nm or more is 0.15-0.40ml / g; SiO2 contained in the silica carrier is from silica powder and silicon sol, the SiO2 introduction amount in the silica sol is 5-15% of the total SiO2 amount in the carrier; and the particle median diameter of the silica sol is 20-30nm, and most of SiO2 introduced to the silica sol is dispersed among silica micro-particles, and is sintered among the silica micro-particles to realize a bonding effect. The catalyst has the advantages of good mechanical strength, good reaction effect and long service life.

Description

technical field [0001] The invention relates to a sulfur recovery catalyst and a preparation method thereof, in particular to a H catalyst with a macroporous structure. 2 Catalyst for producing sulfur by selective oxidation of S and preparation method thereof. Background technique [0002] In industry, the Claus process is generally used to treat the H-containing gas produced in oil refining and chemical processes. 2 S acid gas, but the existing Claus process can only handle H 2 High-concentration acid gas with S content greater than 20% cannot handle H 2 Low-concentration acid gas with S content less than 5% is due to low calorific value, such as Claus tail gas, so low H 2 Catalyst and process for producing sulfur by selective oxidation of sulfur-concentrated acid gas, especially Claus tail gas. Based on the Claus process, the Super Claus process uses low concentration H 2 The Claus tail gas of S is selectively oxidized to further produce sulfur. [0003] h 2 The mai...

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Problems solved by technology

[0015] Chinese patent 90107074.2 discloses a kind of silicon dioxide as a carrier, selective oxidation of H 2 Catalyst and preparation method for generating elemental sulfur from S, the silica carrier provided has low activity to Claus reaction, far lower than high-temperature alumina carrier with similar pore structure

[0020] Mechanical strength is an important indicator of the catalyst, so choose to oxidize H 2 For catalysts that generate elemental sulfur from S, if the strength is lower than 100N / cm, there will be many disadvantages in the industrial application process, such as fragility and easy pulverization, which will cause further problems such as increased bed pressure drop, bias flow, etc. , thereby reducing the processing capacity and shortening the service life of the catalyst

[0021] In recent years, some manufacturers have also used silica sol as a binder, mixed with silica powder, kneaded, extruded (addition of water, cellulose, celadon powder, etc.), and then dried and roasted at about 650 ° C to prepare The silica carrier is used to improve the mechanical strength of the carrier, but it basically does not involve how to increase the macropore volume by adding more pore-forming agents under the premise of ensuring the mechanical strength, and further prepare the selective oxidation H 2 Study on Catalysts for Generating Elemental Sulfur from S

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