Vanadium catalyst for sulfuric acid production as well as preparation method and use method of vanadium catalyst

Abstract

The invention discloses a vanadium catalyst for sulfuric acid production and a preparation and use method thereof, and belongs to the technical field of catalysts. A catalyst formula and a preparation process are improved, a silicate aid is added to generate crystal silicon dioxide to regulate and control the structure of a diatomite carrier, and a tabletting molding process is adopted to replace an extrusion molding process, so that the strength and stability of the catalyst are improved, the abrasion is reduced, and the pulverization resistance is improved; the additive is added to modulate the active phase of the catalyst, the activity stability is improved, and the requirements of modern sulfuric acid production can be met. The catalyst produced by the technical scheme is uniform in active component distribution and high in mechanical strength, the stability is improved, the production requirements of sulfuric acid manufacturers can be better met, the operation stability of a sulfuric acid production device is improved, and remarkable economic benefits and social benefits are achieved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of catalyst technology, and particularly relates to a vanadium catalyst for sulfuric acid production and a preparation method and use method thereof. BACKGROUND

[0002] In the process of sulfuric acid production, the reaction temperature of SO2 oxidation to SO3 is generally controlled below 600℃, and low-temperature catalysts (such as S107, S108 series catalysts) suitable for 390-440℃ and medium-temperature catalysts (such as S101 series catalysts) suitable for 420-600℃ are generally used in industry. The former has good low-temperature activity but poor high-temperature activity, and the latter has good high-temperature activity but poor low-temperature activity, and both have narrow operating temperature range, and only when the two are used together can a high conversion rate be obtained.

[0003] The vanadium catalysts for sulfuric acid production have been prepared by traditional wheel-mixing process for decades.

[0004] The wheel-mixing process includes: 1, refining of diatomite; 2, co-dissolving vanadium pentoxide and potassium hydroxide to form potassium metavanadate solution; 3, neutralizing the potassium metavanadate solution with concentrated sulfuric acid to form vanadium pentoxide precipitate and potassium sulfate solution; 4, mixing the vanadium pentoxide and potassium sulfate solution with refined diatomite, and then adding other additives and fully mixing and rolling in a roller; 5, extruding the mixed material into strips, drying and calcining to obtain the finished product. The product prepared by this process has the defect that the active component and the carrier are solid-solid mixed, the active component cannot be uniformly distributed in the micropores of the carrier, the activity of the catalyst is reduced, the decay is accelerated, the strength of the catalyst is low, and the abrasion is large. The catalyst prepared by the traditional process cannot meet the process requirements of modern sulfuric acid, and it is difficult to meet the requirements of conversion efficiency and anti-pulverization performance.

[0005] Chinese patent CN105413716A discloses a post-neutralization preparation method of vanadium catalyst. The feature is that the neutralization reaction process of the traditional wheel-mixing process is moved to the rear, the prepared potassium metavanadate solution is first mixed with part of diatomite, then neutralized with sulfuric acid, and then mixed with the remaining diatomite, formed, dried, and calcined to obtain the catalyst. The liquid-solid mixing method is adopted, so that the active component is fully soaked in the micropores of the carrier and on the surface, and uniformly dispersed on the carrier. The agglomeration of active substances is effectively prevented from leaving the carrier, the thermal decay is reduced, the integrity of the diatomite skeleton is maintained, the internal porosity and specific surface area of the product are improved, the bulk density is reduced under the premise of ensuring mechanical strength, and the activity is improved.

[0006] Chinese patent CN102350367A discloses a kind of sulfur dioxide oxidation catalyst for manufacturing sulfuric acid.The feature is that when preparing catalyst, microwave drying method is used to dry its shaped catalyst material, and after drying, catalyst material is calcined using medium frequency furnace, energy consumption is significantly reduced compared with prior art, and automation continuous production is realized, catalyst product bulk density is significantly reduced, quality and activity are greatly improved, and the preparation process still uses wheel grinding mixing.

[0007] Chinese patent CN109759052A discloses a kind of sulfur dioxide oxidation catalyst for manufacturing sulfuric acid.The feature is that when preparing catalyst, microwave drying method is used to dry its shaped catalyst material, and after drying, catalyst material is calcined using medium frequency furnace, energy consumption is significantly reduced compared with prior art, and automation continuous production is realized, catalyst product bulk density is significantly reduced, quality and activity are greatly improved, and the preparation process still uses wheel grinding mixing.

[0008] With the increasingly stringent environmental protection requirements, the limit of tail gas SO2 emission is lower and lower, and the catalyst is required to have better performance, and a vanadium catalyst for sulfuric acid production which can maintain good conversion rate and structural stability is urgently needed, and therefore a vanadium catalyst for sulfuric acid production and a preparation method thereof are proposed, so that the catalyst has better conversion performance and structural stability. SUMMARY

[0009] In view of the technical problems of low strength, easy pulverization and fast activity decline of the existing vanadium catalyst for sulfuric acid production, the purpose of the present application is to provide a vanadium catalyst for sulfuric acid production and a preparation method thereof, by improving the catalyst formula and preparation process, adding silicate adjuvant to generate crystalline silicon dioxide to regulate the structure of diatomite carrier, using tabletting process instead of extrusion forming process to improve the strength and stability of the catalyst, reduce abrasion and improve the anti-pulverization performance, by adding adjuvant to adjust the active phase of the catalyst, improve its activity stability, and meet the needs of modern sulfuric acid production.

[0010] The present application is realized by the following technical solutions:

[0011] A vanadium catalyst for sulfuric acid production, which is composed of components with the following mass fractions:

[0012] Vanadium pentoxide 6-9wt%, alkali metal pyrosulfate 25-35wt%, adjuvant 0.5-5wt%, crystalline silicon dioxide 1-6wt% and refined diatomite 45-65wt%;

[0013] The diatomite is refined diatomite after modification treatment.

[0014] A preparation method of a vanadium catalyst for sulfuric acid production, which is prepared by precipitation method, including the following steps:

[0015] S1, select vanadium pentoxide precursor, silicate, alkali hydroxide is dissolved in water, then add sulfuric acid reaction, obtain containing slurry, namely pyrosulfate alkali salt;

[0016] S2, select silicate and sulfuric acid mixture, obtain crystalline silicon dioxide;

[0017] S3, select diatomite raw ore after purification, pulp, heat in dilute sulfuric acid, cool to room temperature, filter, the solid obtained by filtration is washed to neutral with hot water, dried, crushed, to obtain refined diatomite;

[0018] S4, select pyrosulfate alkali salt, refined diatomite and additives mixed continue to pulp treatment, then the slurry spray drying to obtain powdery particles, then tabletting, calcination, cooling, screening, namely.

[0019] As preferred, in the S1, vanadium pentoxide precursor is metavanadate;

[0020] The metavanadate is any one of potassium metavanadate, sodium metavanadate and ammonium metavanadate;

[0021] The silicate is any one of potassium silicate and sodium silicate;

[0022] The alkali hydroxide is any one of potassium hydroxide, sodium hydroxide and cesium hydroxide.

[0023] As preferred, in the S1, the mass concentration of sulfuric acid is 20-40%;

[0024] The amount of sulfuric acid added is (90-150): 100 of the mass ratio of vanadium pentoxide precursor;

[0025] The reaction temperature is 70 DEG C; the reaction time is 2-4h.

[0026] As preferred, in the S2, the volume ratio of silicate and sulfuric acid mixture is (110-350): 100; the mixing condition is temperature 70 DEG C, stirring 1h.

[0027] As preferred, in the S3, the mass concentration of dilute sulfuric acid is 20-40%;

[0028] The heat cooking temperature is 85-100 DEG C; the time is 2-3h.

[0029] As preferred, in the S3, the temperature of hot water is 85-100 DEG C;

[0030] The drying temperature is 115-125 DEG C; the time is 4-8h;

[0031] The particle size after crushing is 120-200 mesh.

[0032] As preferably, in the S4, the assistant is any one of rare earth oxide, ammonium molybdate, phosphoric acid;

[0033] The rare earth oxide is any one of cerium oxide, diaphosphorus pentoxide;

[0034] The temperature of the spray drying is 340-420 DEG C, and the time length is 20-40 min;

[0035] The calcination temperature is 550-650 DEG C, and the time length is 60-90 min.

[0036] A method for using a vanadium catalyst for sulfuric acid production, the vanadium catalyst oxidizing SO2 to SO3 in a sulfuric acid plant.

[0037] As preferably, the specific process is: a gas stream containing SO2, O2, N2 is contacted with a vanadium catalyst in a reactor to obtain a stream containing SO3 flowing out of the reactor.

[0038] Compared with the prior art, the present application has at least the following technical effects:

[0039] (I) The present application provides a vanadium catalyst for sulfuric acid production and a preparation method thereof, by improving the catalyst formula and preparation process, adding silicate assistant to generate crystalline silicon dioxide to regulate the structure of diatomite carrier, using tabletting process instead of extrusion forming process to improve the strength and stability of the catalyst, reduce the abrasion and improve the anti-pulverization performance; by adding assistant to adjust the active phase of the catalyst, the activity stability is improved, which can meet the needs of modern sulfuric acid production.

[0040] (II) The vanadium catalyst for sulfuric acid production and the preparation method thereof have the following advantages:

[0041] 1) The new precipitation method is used to replace the traditional wet mixing method, so that the active components and the carrier are mixed uniformly, the active components are uniformly dispersed, the utilization rate of the active components is improved, and the performance of the catalyst is improved.

[0042] 2) In the preparation process of the active phase, a structural assistant is added to generate crystalline silicon dioxide, which improves the structure of the catalyst, improves the stability of the catalyst, and enhances the heat resistance of the catalyst.

[0043] 3) The tabletting process is used to replace the extrusion forming process, which improves the strength of the catalyst.

[0044] (III) By using the precipitation method, the active components are fully immersed in the micropores of the carrier and on the surface, and are uniformly dispersed on the carrier; by tabletting, the strength of the catalyst is improved, and the abrasion is reduced.

[0045] (Four) The catalyst produced by the technical scheme has uniform active component distribution, high mechanical strength, improved stability, can better meet the production requirements of sulfuric acid manufacturers, improves the operation stability of the sulfuric acid production device, and has remarkable economic and social benefits. DETAILED DESCRIPTION

[0046] The embodiments of the present application will be described in detail below with reference to examples, but those skilled in the art will understand that the following examples are only for illustration of the present application and should not be regarded as limiting the scope of the present application. The specific conditions not mentioned in the examples are carried out according to the conventional conditions or the conditions recommended by the manufacturer. The reagents or instruments not mentioned by the manufacturer are conventional products that can be purchased on the market.

[0047] Example 1

[0048] A preparation method of a vanadium catalyst for sulfuric acid production, prepared by a precipitation method, comprising the following steps:

[0049] In a beating bucket with a stirring paddle and water bath heating, 1000L of desalted water is added, 120kg of potassium metavanadate, 40kg of potassium hydroxide are added at a temperature of 70℃, stirring for 1h, 300L of potassium silicate is added, stirring for 20min, 100L of sulfuric acid is added, and stirring is continued for 1h to obtain a slurry containing precipitates.

[0050] 640kg of refined diatomite and 10kg of lanthanum oxide are added to the above slurry containing precipitates for further beating, and then spray drying is carried out at 350℃, tabletting is performed, and the sample is sent into a mesh belt heating furnace at 600℃ for calcination for 80min, cooled, and sieved to obtain a catalyst sample, marked as S-1.

[0051] The V2O57.1%, pyrosulfuric acid alkali metal salt 33.8%, lanthanum oxide 1.6%, crystalline silicon dioxide 3.7%, diatomite 53.1%.

[0052] Example 2

[0053] A preparation method of a vanadium catalyst for sulfuric acid production, prepared by a precipitation method, comprising the following steps:

[0054] In a beating bucket with a stirring paddle and water bath heating, 1000L of desalted water is added, 120kg of potassium metavanadate, 40kg of potassium hydroxide are added at a temperature of 70℃, stirring for 1h, 300L of potassium silicate is added, stirring for 20min, 100L of sulfuric acid is added, and stirring is continued for 1h to obtain a slurry containing precipitates.

[0055] In the slurry containing the precipitate, 660 kg of refined diatomite and 10 kg of ammonium molybdate are added for further beating, and then spray drying is performed at 380°C, tabletting is performed, and the tablets are fed into a mesh belt heating furnace for calcination at 620°C for 60 minutes, and then the tablets are cooled, screened, and a catalyst sample is obtained, which is labeled as S-2.

[0056] The V2O5 content is 8.0%, the pyrosulfate alkali metal salt content is 34.6%, the molybdenum oxide content is 0.6%, the crystalline silicon dioxide content is 3.8%, and the diatomite content is 52.9%.

[0057] Example 3:

[0058] A preparation method of a vanadium catalyst for sulfuric acid production, which is prepared by a precipitation method, includes the following steps:

[0059] In a beating tank with a stirring paddle and water bath heating, 1000 L of desalted water is added, and then 100 kg of potassium metavanadate and 80 kg of potassium hydroxide are added at a temperature of 70°C, and stirring is performed for 1 h, 100 L of sodium silicate is added, and stirring is performed for 20 min, 90 L of sulfuric acid is added, and stirring is continued for 1 h, and a slurry containing a precipitate is obtained.

[0060] In the slurry containing the precipitate, 600 kg of refined diatomite and 10 kg of cerium oxide are added for further beating, and then spray drying is performed at 340°C, tabletting is performed, and the tablets are fed into a mesh belt heating furnace for calcination at 650°C for 60 minutes, and then the tablets are cooled, screened, and a catalyst sample is obtained, which is labeled as S-3.

[0061] The V2O5 content is 6.6%, the pyrosulfate alkali metal salt content is 33.9%, the cerium oxide content is 1.7%, the crystalline silicon dioxide content is 1.7%, and the diatomite content is 55.4%.

[0062] Example 4:

[0063] A preparation method of a vanadium catalyst for sulfuric acid production, which is prepared by a precipitation method, includes the following steps:

[0064] In a beating tank with a stirring paddle and water bath heating, 1000 L of desalted water is added, and then 80 kg of sodium metavanadate and 60 kg of potassium hydroxide are added at a temperature of 70°C, and stirring is performed for 1 h, 150 L of potassium silicate is added, and stirring is performed for 20 min, 80 L of sulfuric acid is added, and stirring is continued for 1 h, and a slurry containing a precipitate is obtained.

[0065] In the slurry containing the precipitate, 640 kg of refined diatomite and 20 L of phosphoric acid are added for further beating, and then spray drying is performed at 400°C, tabletting is performed, and the tablets are fed into a mesh belt heating furnace for calcination at 550°C for 90 minutes, and then the tablets are cooled, screened, and a catalyst sample is obtained, which is labeled as S-4.

[0066] V2O5 6.1%, pyrosulfate alkali metal salt 30.0%, phosphorus pentoxide 2.1%, crystalline silica 2.1%, diatomite 59.8%.

[0067] Example 5:

[0068] A preparation method of a vanadium catalyst for sulfuric acid production, prepared by a precipitation method, comprising the following steps:

[0069] In a beating bucket with a stirring paddle and water bath heating, 1000L of desalted water is added, 90kg of potassium metavanadate, 20kg of ammonium metavanadate, 90kg of potassium hydroxide are added at a temperature of 70℃, stirring for 1h, 120L of sodium silicate is added, stirring for 20min, 110L of sulfuric acid is added, continuing to stir for 1h, to obtain a slurry containing precipitate.

[0070] In the above slurry containing precipitate, 700kg of refined diatomite, 8kg of cerium oxide are added to continue beating, then spray drying at 420℃, tabletting, feeding into a mesh belt heating furnace at 580℃ for calcination for 75min, cooling, screening, to obtain a catalyst sample, marked as S-5.

[0071] V2O5 6.7%, pyrosulfate alkali metal salt 32.4%, cerium oxide 1.2%, crystalline silica 1.8%, diatomite 57.4%.

[0072] Example 6:

[0073] A preparation method of a vanadium catalyst for sulfuric acid production, prepared by a precipitation method, comprising the following steps:

[0074] In a beating bucket with a stirring paddle and water bath heating, 1000L of desalted water is added, 80kg of ammonium metavanadate, 60kg of potassium hydroxide are added at a temperature of 70℃, stirring for 1h, 380L of potassium silicate is added, stirring for 20min, 110L of sulfuric acid is added, continuing to stir for 1h, to obtain a slurry containing precipitate.

[0075] In the above slurry containing precipitate, 590kg of refined diatomite, 10kg of lanthanum oxide are added to continue beating, then spray drying at 390℃, tabletting, feeding into a mesh belt heating furnace at 610℃ for calcination for 85min, cooling, screening, to obtain a catalyst sample, marked as S-6.

[0076] V2O5 6.0%, pyrosulfate alkali metal salt 34.3%, lanthanum oxide 1.7%, crystalline silica 5.0%, diatomite 52.3%.

[0077] Example 7:

[0078] A preparation method of a vanadium catalyst for sulfuric acid production, prepared by a precipitation method, comprising the following steps:

[0079] In a beater with stirring paddle and water bath heating, 1000L of desalted water was added, at temperature 70°C, 85kg of potassium metavanadate, 50kg of sodium metavanadate, 10kg of cesium hydroxide were added, stirring for 1h, 240L of potassium silicate was added, stirring for 20min, 90L of sulfuric acid was added, continue stirring for 1h, to obtain the slurry containing precipitate.

[0080] In the above slurry containing precipitate, 640kg of refined diatomite, 50L of phosphoric acid was added to continue beating, then spray drying at 370°C, tabletting, into the mesh belt heating furnace 590°C calcination for 80min, cooling, screening, to obtain the catalyst sample, marked as S-7.

[0081] Its V2O58.9%, pyrosulfate alkali metal salt 26.5%, phosphorus pentoxide 4.9%, crystalline silicon dioxide 3.1%, diatomite 56.4%.

[0082] Example 8:

[0083] A preparation method of a vanadium catalyst for sulfuric acid production, prepared by precipitation method, comprising the following steps:

[0084] In a beater with stirring paddle and water bath heating, 1000L of desalted water was added, at temperature 70°C, 85kg of potassium metavanadate, 50kg of sodium metavanadate, 10kg of cesium hydroxide were added, stirring for 1h, 240L of potassium silicate was added, stirring for 20min, 90L of sulfuric acid was added, continue stirring for 1h, to obtain the slurry containing precipitate.

[0085] In the above slurry containing precipitate, 640kg of refined diatomite, 50L of phosphoric acid was added to continue beating, then spray drying at 370°C, tabletting, into the mesh belt heating furnace 590°C calcination for 80min, cooling, screening, to obtain the catalyst sample, marked as S-7.

[0086] Its V2O57.3%, pyrosulfate alkali metal salt 30.8%, molybdenum trioxide 3.0%, crystalline silicon dioxide 1.6%, diatomite 57.3%.

[0087] Comparative example:

[0088] The sample formula of S101 is: V2O58.0%, K2O / V2O52.7(molar ratio), the rest is diatomite.

[0089] KOH was dissolved with steam, and K2O / V2O5 of 2.7 KVO3 and KOH mixed solution (hereinafter referred to as vanadium water) was prepared under hot boiling conditions. The V2O5 concentration of the prepared vanadium water was 220g / L, and K2O / V2O5 was 2.7.

[0090] The vanadium water of 281L is neutralized with 50L sulfuric acid to produce V2O5 and K2SO4 colloidal precipitate, 600kg diatomite and the like are added into a mill to mix uniformly, water is added to roll and compact to become plastic material, and then the vanadium catalyst is prepared through extruding, drying, calcining and the like processes.

[0091] The relevant performance test results of the samples prepared in the eight embodiments and the comparative examples of the technical solution are shown in the following table.

[0092] Catalyst performance test conditions:

[0093] 1. Sample test

[0094] Catalyst sample: particle size is

[0095] Activity test conditions: conversion uses a jacketed single tube reactor, the tube diameter is The temperature measuring thermocouple sleeve is located at the center of the converter, and the tube diameter is

[0096] Catalyst loading: 30ml

[0097] Catalyst particle size: 3.35-4mm

[0098] Space velocity: 3600h -1

[0099] The volume percentage of SO2 in the inlet gas is 10%±1%, and the rest is air

[0100] System pressure: normal pressure

[0101] Activity detection temperature: 410℃, 485℃

[0102] Heat resistance temperature: 600℃, 5h

[0103] The activity is expressed by SO2 conversion rate.

[0104] 2. Strength test:

[0105] Catalyst sample: particle size is

[0106] Strength test conditions:

[0107] The particle radial compressive strength is measured according to the provisions of GB / T3635. The strength is measured by an intelligent particle strength tester with a precision of 1 level and a range of 0-250N.

[0108] 3. Abrasion rate test

[0109] It is carried out according to the provisions of HG / T 2969, wherein the sample is dried at (120±5)℃ for 2h.

[0110] The activity test results are listed in Table 1, and the strength test results are listed in Table 2.

[0111] Table 1 Activity test results

[0112]

[0113]

[0114] Table 2 Strength, abrasion rate test results

[0115] Sample Example Strength (N / cm) Wear Rate Example 1 100 1.5 Example 2 105 1.8 Example 3 102 1.4 Example 4 106 1.2 Example 5 110 0.8 Example 6 108 1.0 Example 7 98 2.0 Example 8 104 1.3 Industry Standard ≧35 ≦5

[0116] As can be seen from the test results in Table 1, the activity of the vanadium catalyst for sulfuric acid production prepared by the method of the present technical solution is significantly higher than the performance of the ordinary catalyst.

[0117] The test results in Table 2 show that the vanadium catalyst for sulfuric acid production prepared by the present application has higher strength and low abrasion rate.

[0118] In summary, the performance of the catalyst prepared by the present technical solution is significantly improved, and can meet the higher SO2 conversion rate requirement in sulfuric acid production.

[0119] The catalyst prepared by the method has the advantages of anti-pulverization, high strength, good activity and good stability.

[0120] Finally, it should be noted that: the above only describes the preferred embodiments of the present application, and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A vanadium catalyst for sulfuric acid production, characterized in that, The vanadium catalyst is composed of components with the following mass fractions: Vanadium pentoxide 6-9 wt%, alkali metal pyrosulfate 25-35 wt%, structure aid 0.5-5 wt%, crystalline silicon dioxide 1-6 wt%, and diatomite 45-65 wt%; The diatomite is refined diatomite after modification.

2. A method for producing a vanadium catalyst for sulfuric acid production as claimed in claim 1, characterized in that, Preparation by precipitation method, including the following steps: S1, select vanadium pentoxide precursor, silicate, alkali hydroxide, dissolve in water, then add sulfuric acid to react, obtain slurry containing precipitate, namely alkali metal pyrosulfate; S2, select silicate and sulfuric acid mixture to obtain crystalline silicon dioxide; S3, select diatomite ore after purification, slurry, heat cook in dilute sulfuric acid, cool to room temperature, filter, wash the obtained solid with hot water to neutral, dry, crush, to obtain refined diatomite; S4, select alkali metal pyrosulfate, refined diatomite and aid, continue to slurry, then spray dry to obtain powdery particles, then tablet, calcine, cool, sieve, and obtain.

3. The method for preparing a vanadium catalyst for sulfuric acid production according to claim 2, characterized by, In S1, the vanadium pentoxide precursor is metavanadate; The metavanadate is any one of potassium metavanadate, sodium metavanadate and ammonium metavanadate; The silicate is any one of potassium silicate and sodium silicate; The alkali hydroxide is any one of potassium hydroxide, sodium hydroxide and cesium hydroxide.

4. The method for preparing a vanadium catalyst for sulfuric acid production according to claim 2, characterized by, In S1, the mass concentration of sulfuric acid is 20-40%; The amount of sulfuric acid added is (90-150):100 of the mass ratio of vanadium pentoxide precursor; The reaction temperature is 70℃, and the reaction time is 2-4h.

5. The method for preparing a vanadium catalyst for sulfuric acid production according to claim 2, characterized by, In S2, the volume ratio of silicate and sulfuric acid mixture is (110-350):100; The mixing condition is temperature 70℃, stirring for 1h.

6. The method for preparing a vanadium catalyst for sulfuric acid production according to claim 2, characterized by, In S3, the mass concentration of dilute sulfuric acid is 20-40%; The heat cooking temperature is 85-100℃, and the time is 2-3h.

7. The method for preparing a vanadium catalyst for sulfuric acid production according to claim 2, characterized by, In S3, the temperature of hot water is 85-100℃; The drying temperature is 115-125℃, and the time is 4-8h; The particle size after crushing is 120-200 mesh.

8. The method for preparing a vanadium catalyst for sulfuric acid production according to claim 2, characterized by, In S4, the aid is any one of rare earth oxide, ammonium molybdate, phosphoric acid and lanthanum oxide; The rare earth oxide is any one of cerium oxide and phosphorus pentoxide; The spray drying temperature is 340-420℃, and the time is 20-40min; The calcination temperature is 550-650℃, and the time is 60-90min.

9. A method for using the vanadium catalyst for sulfuric acid production according to claim 1, characterized in that, The vanadium catalyst oxidizes SO2 to SO3 in a sulfuric acid device.

10. A method of using a vanadium catalyst for sulfuric acid production according to claim 9, characterized in that, The specific process is: the gas stream containing SO2, O2 and N2 is contacted with the vanadium catalyst in the reactor to obtain effluent gas containing SO3 flowing out of the reactor.

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