Formaldehyde synthesis catalyst by iron molybdenum method and preparation method thereof

A catalyst, iron-molybdenum technology, applied in the field of iron-molybdenum catalyst and its preparation, can solve the problem that the formaldehyde yield of the catalyst is less than 92%, and achieve the effects of long service life, good mass and heat transfer, and good thermal stability

Active Publication Date: 2018-08-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The catalyst described in Chinese patent CN1792443A is to add additive cerium to the iron molybdenum oxide catalyst, but the catalyst formaldehyde yield is less than 92%

Method used

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  • Formaldehyde synthesis catalyst by iron molybdenum method and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Be that precipitation temperature is 65 ℃, under strong stirring, in 2660ml, mass concentration is 15% ammonium molybdate solution, add 1000ml mass concentration rapidly in 3 minutes and be 10% ferric nitrate solution, remaining 2500ml mass concentration is 10 % ferric nitrate solution was slowly added in the ammonium molybdate solution in 20 minutes, when the pH value of the co-precipitation reaction suspension was 1.8, the pH value required for the reaction was adjusted to the end of the reaction with ammonia water, after the precipitation reaction ended , continue to stir for 1.0 hours, settle and remove the supernatant, wash twice, filter, dry the filter cake at 110 ° C, add 6% of the weight of the dry filter cake, kneading, extruded into ￠1.5mm× 4.5mm, length of 4.5mm hollow cylinder, after drying, within 18 hours, use the temperature program to increase the calcination temperature from room temperature to 420 ℃, and keep it at this temperature for 2 hours, the cata...

Embodiment 2

[0016] It is 65 ℃ at precipitation temperature, under strong stirring, in 2660ml, mass concentration is in the ammonium molybdate solution of 15%, in the time of 3 minutes, add 1000ml mass concentration rapidly and be 10% ferric nitrate and nickel nitrate mixed solution (nickel occupies 0.5% of the catalyst mass), the remaining 2500ml mixed acid solution was slowly added to the ammonium molybdate solution in 20 minutes, when the pH value of the co-precipitation reaction suspension was 1.8, the pH value was adjusted to the end of the reaction with ammonia water, and continued Stir for 1.0 hour, settle and remove the supernatant, wash twice, filter, dry the filter cake at 110°C, add 6% of the weight of the dry filter cake of methylcyanine powder, knead with water, extrude into ￠4.5×2.0mm, A hollow cylinder with a length of 4.5 mm. After drying, within 18 hours, use a temperature program to raise the roasting temperature from room temperature to 420 ° C, and keep it at this temper...

Embodiment 3

[0018] Be 65 ℃ at precipitation temperature, under strong stirring, in the ammonium molybdate solution that 2660ml, mass concentration are 15%, add 1500ml mass concentration rapidly in 5 minutes and be that 10% ferric nitrate and nickel nitrate mixed solution (nickel occupies 1.5% of the catalyst mass), the remaining 2000ml mixed acid solution was slowly added to the ammonium molybdate solution in 20 minutes, when the pH value of the co-precipitation reaction suspension was 1.8, the pH value was adjusted to the end of the reaction with ammonia water, and continued Stir for 1.0 hour, settle and remove the supernatant, wash twice with deionized water, filter, dry the filter cake at 110°C, add 6% of the weight of the dry filter cake of scallop powder and methyl cellulose, add water and knead, Extruded into a hollow cylinder with a length of ￠4.5×2.0mm and a length of 4.5mm. After drying, within 18 hours, use a temperature program to raise the roasting temperature from room tempera...

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Abstract

The invention relates to an iron-molybdenum method formaldehyde synthesis catalyst and a preparation method thereof. The oxide of nickel as an auxiliary agent is added to the iron-molybdenum two-component catalyst system, and by controlling the reaction speed of co-precipitation, the obtained catalyst has a wide pore size distribution, The proportion of mesopores is relatively large, and some macropores are artificially manufactured, and the prepared catalyst is conducive to mass transfer and heat transfer during the catalytic reaction process, and improves the yield of formaldehyde and the conversion rate of methanol. The catalyst has good thermal stability and long service life.

Description

technical field [0001] The invention belongs to the field of organic chemical catalysts, in particular to an iron-molybdenum catalyst for formaldehyde production and a preparation method thereof. Background technique [0002] Formaldehyde is an important basic organic chemical raw material, widely used in chemical industry, medicine, textile, wood processing and petroleum industry. Modern industrial formaldehyde production mainly adopts the oxidation method preparation process with methanol as raw material, and the "iron-molybdenum method" formaldehyde production process has obvious technical advantages over the "silver method", and has been widely developed and utilized. [0003] There are many patents on the preparation of iron-molybdenum catalysts disclosed at home and abroad. U.S. Patent Publication No. 3,408,309 introduces a catalyst for the oxidation of methanol to formaldehyde by a two-component oxide of iron and molybdenum, but its performance needs to be further im...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/883C07C47/052C07C45/37
Inventor 张皓孙远龙袁浩然
Owner CHINA PETROLEUM & CHEM CORP
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