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Low-temperature type vanadium catalyst for catalyzing SO2 oxidizing reaction

An oxidation reaction and catalyst technology, applied in the direction of physical/chemical process catalysts, inorganic chemistry, sulfur compounds, etc., can solve the problems of low quality and performance differences of vanadium catalysts, achieve excellent low-temperature catalytic activity, shorten the production process, and save construction The effect of investment

Active Publication Date: 2012-06-20
吉林省临江天元催化剂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there has been no systematic research on the modification of diatomite required for the production of vanadium catalysts in China. Catalysts suitable for the type of diatomite resources in my country have been discovered, resulting in low quality domestic vanadium catalysts, and their performance is comparable to that of vanadium catalysts produced by foreign companies. There are certain differences

Method used

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  • Low-temperature type vanadium catalyst for catalyzing SO2 oxidizing reaction
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  • Low-temperature type vanadium catalyst for catalyzing SO2 oxidizing reaction

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Experimental program
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Effect test

Embodiment 1

[0038] Embodiment 1: the control study of the influence of auxiliary agent on conversion rate

[0039] In order to study the impact of adding different additives on the catalytic activity in the catalyst, in the proportioning of the vanadium-potassium-sodium-silicon system of the low-temperature sulfuric acid catalyst (6-7% of vanadium pentoxide, 20-30% of potassium hydrogensulfate, Sodium sulfate 8-10%, diatomaceous earth 50-63%) directly add a certain amount of nickel sulfate heptahydrate (NiSO 4 ·7H 2 O), manganese sulfate monohydrate (MnSO 4 H2O), antimony pentoxide (Sb 2 o 5 ), tin sulfate (SnSO 4 ), ammonium molybdate ((NH 4 )2Mo 4 ) and cesium sulfate (Cs 2 SO 4 ) additives were mixed and rolled to prepare samples, the numbers are TY-001, TY-002, TY-003, TY-004, TY-005, TY-006, and the S107 sample is a conventional low temperature without additives Type vanadium-potassium-sodium-silicon system catalyst comparison. These samples were tested for compressive stre...

Embodiment 2

[0043] Embodiment 2: the influence of different reaction temperatures on conversion rate

[0044] According to the results in Table 2, the present invention measured the conversion rate of sulfur dioxide oxidation to sulfur trioxide at different reaction temperatures for TY-004, TY-005, TY-006 and S107 samples, and further investigated the reaction performance. The results are shown in Table 3 and figure 2 :

[0045] Table 3: Conversion rate of sulfur dioxide oxidation to sulfur trioxide at different reaction temperatures

[0046]

[0047] From Table 3 and figure 2 It can be clearly seen from the results that before the reaction temperature is 410°C, the conversion rates of sulfur dioxide to sulfur trioxide of TY-004, TY-005 and TY-006 samples are all higher than those of S107 sample, but at 430°C, only TY- The conversion rate of sulfur dioxide to sulfur trioxide in sample 006 is higher than that in sample S107. Note that after adding the SnSO 4 and (NH 4 ) 2 Mo 4...

Embodiment 3

[0048] Embodiment 3: the determination of cesium compound

[0049] Cesium is a silver-white metal, soft and light, and malleable. Density 1.8785 g / cm 3 . The melting point is 28.40±0.01°C, and the boiling point is 678.4°C. Valence +1. The ionization energy is 3.894 electron volts. It is the most active among the alkali metals, and it can react violently with water and even with ice as low as -116°C. Due to its large ionic radius, it can form stable halides with halogens, and its hydroxides can also form corresponding salt compounds with sulfuric acid, nitric acid, hydrochloric acid and carbonic acid. Since halogen elements are generally considered to be catalyst poisons, the halides of cesium are not considered in this work, and only cesium hydroxide, cesium sulfate, cesium nitrate and cesium carbonate are investigated. The present invention directly adds a certain amount of cesium sulfate (Cs 2 SO 4 ), cesium nitrate (CsNO 3 ), cesium carbonate (Cs 2 CO 3 ) and ces...

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Abstract

The invention provides a low-temperature type vanadium catalyst for catalyzing SO2 oxidizing reaction, which comprises kieselguhr, vanadium pentoxide, potassic sulfate, sodium-contained sulfate and cesium sulfate. The catalyst has excellent catalytic activity. The invention also provides a preparation method of the vanadium catalyst for catalyzing the SO2 oxidizing reaction. The method directly adopts a mixed milling method to prepare the vanadium catalyst without acid treatment or a vanadium oxidizing process or a neutralization process, and thereby, not only is the production flow shortenedbut also acidic waste water can not be generated. The catalyst has environmental friendliness.

Description

technical field [0001] The present invention relates to a new SO 2 Oxidation catalysts, more particularly to a catalyst that catalyzes SO 2 New vanadium catalysts for oxidation reactions. Background technique [0002] SO 2 Oxidation reaction with oxygen to produce SO 3 , SO 3 Absorbed by water to generate sulfuric acid; in addition, SO 3 It can also be used as raw material gas for sulfonation reaction, so SO 2 Oxidation reaction occupies a very important position in sulfuric acid industry and basic chemical industry. SO 2 Three solid catalysts have been used for the oxidation of α: iron catalyst, platinum catalyst and vanadium catalyst. The iron catalyst is cheap, and it needs to be replaced by Fe at 640°C 2 o 3 It is active only when the form exists, and the equilibrium conversion rate is very low above 640 °C. Thanks to SO 2 Oxidation reactions are strongly exothermic, so iron catalysts are not commonly used. Platinum catalysts are expensive and are easily dea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/055C01B17/79
Inventor 庄广明
Owner 吉林省临江天元催化剂有限公司
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