A kind of iron-molybdenum catalyst and preparation method and application of methanol oxidation synthesis formaldehyde

A methanol oxidation and catalyst technology, which is applied in the preparation of organic compounds, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of shortened catalyst life, accelerated rate, and high catalyst roasting temperature. problem, achieve the effect of reducing production cost and energy consumption, prolonging service life and reducing roasting temperature

Active Publication Date: 2020-05-01
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned catalysts have obtained a relatively high conversion rate of methanol, the calcination temperature of the catalyst is relatively high, and the strength of the molded catalyst is poor and easily broken, which will lead to an increase in the resistance of the catalyst bed, thereby reducing the service life of the catalyst.
In addition, because the reaction temperature used by the above-mentioned catalyst is also high, the rate of the main and side reactions is accelerated at the same time, and the selectivity of formaldehyde is reduced. shortened service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 400 g (NH 4 ) 6 Mo 7 o 24 4H 2 O and 2.7 g NH 4 VO 3 Add it to 40°C, 2290 ml of deionized water, dissolve it completely under vigorous stirring, and use 20wt% HNO 3 Solution adjusts PH=1.5 to make mixed solution; 503 grams of Fe(NO 3 ) 3· 9H 2 O and 7.9 g Ce(NO3)·6H 2 O was added to 1270 ml of deionized water as a precipitant, and stirred thoroughly to dissolve it completely. Then the precipitant was slowly added dropwise to the above mixed solution, with 20wt% NH 3 ·H 2 O adjusted the pH of the suspension to 1.5 until the precipitation was completed, and the precipitation reaction was completed in 90 minutes. And aging for 2 hours under the condition of stirring and 40° C., finally, the precipitate was filtered, washed three times with deionized water, and dried at 110° C. for 12 hours. Take the above-mentioned dried precipitation material, add 71.7 grams of silica sol (solid content is 30wt%), mix well, add deionized water to extrude into a cylinder, dry ...

Embodiment 2

[0028] 200 g (NH 4 ) 6 Mo 7 o 24 4H 2 O and 11.92 g NH 4 VO 3 Add it into 2470 ml of deionized water at 50°C, dissolve it completely under vigorous stirring, and use 15wt% HNO 3 Solution adjusts PH=3 to make mixed solution; 306 grams of Fe(NO 3 ) 3 9H 2 O and 32.9 g Ni(NO 3 ) 2· 6H 2 O was added to 2180 ml of deionized water as a precipitating agent and stirred thoroughly to dissolve it completely. Then slowly drop the precipitant into the ammonium molybdate solution, with 25wt% NH 3 ·H 2 O adjusted the pH of the suspension to 3 until the precipitation was completed, and the precipitation reaction was completed in 70 minutes. And aged under the condition of stirring and 50° C. for 1 hour, finally the precipitate was filtered, washed with deionized water once, and dried at 120° C. for 8 hours. Take the above-mentioned dried precipitation material, add 160 grams of titanium sol (solid content is 15wt%), mix evenly, add deionized water to extrude into a ring shape,...

Embodiment 3

[0031] 400 g (NH 4 ) 6 Mo 7 o 24 4H 2 O and 26.5 g NH 4 VO 3 Add it to 70°C, 2500ml deionized water, dissolve it completely under vigorous stirring, and use 10wt% HNO 3Solution adjusts PH=1.0 to make mixed solution; 411 grams of Fe(NO 3 ) 3· 9H 2 O and 3.41 g Mn(NO 3 ) 2 4H 2 O was added to 1720 ml of deionized water as a precipitant, and stirred thoroughly to dissolve it completely. Then the precipitating agent was slowly added dropwise to the above mixed solution, with 30wt% NH 3 ·H 2 O adjusted the pH of the suspension to 1.0 until the precipitation was completed, and the precipitation reaction was completed in 80 minutes. And aged under the condition of stirring and 70° C. for 1 hour, finally the precipitate was filtered, washed twice with deionized water, and dried at 90° C. for 16 hours. Take the above-mentioned dried precipitation material, add 43.3 grams of silica sol (solid content is 30wt%), mix well, add deionized water to extrude into flakes, dry at ...

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PUM

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Abstract

The invention discloses an iron-molybdenum catalyst for formaldehyde synthesis through methanol oxidation. The iron-molybdenum catalyst consists of an active metal oxide, an assistant metal oxide and a binder metal oxide, wherein the molar ratio of Mo to Fe to V to assistant metal to binder metal is 1:(0.33-0.67):(0.001-0.1):(0.001-0.1):(0.01-0.5). The iron-molybdenum catalyst has the advantages of low cost, long service life and low calcination temperature and reaction temperature.

Description

technical field [0001] The invention relates to an iron-molybdenum catalyst for methanol oxidation to formaldehyde, a preparation method and application thereof. Background technique [0002] Formaldehyde is an important basic organic chemical raw material, which is mainly produced industrially through methanol oxidation. The process of producing formaldehyde from methanol and air is divided into silver method and iron molybdenum method according to the catalyst. Among them, the silver catalyst method uses silver mesh or silver particles paved into a thin layer as the catalyst to control the excess of methanol, and the reaction temperature is about 600-720°C. The production process is simple and the investment is small, but the conversion rate of methanol is low and the unit consumption is high. , the catalyst life is short, and it is suitable for the production of low-concentration formaldehyde. The iron-molybdenum method uses metal oxides of iron and molybdenum as catalys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/881B01J23/883B01J23/889C07C45/38C07C47/052
CPCB01J23/002B01J23/8877B01J23/8898B01J2523/00C07C45/38C07C47/04B01J2523/3712B01J2523/55B01J2523/68B01J2523/842B01J2523/47B01J2523/847B01J2523/41B01J2523/72B01J2523/3706B01J2523/48B01J2523/54
Inventor 谭猗生闵小建杨彩虹寇永利宋法恩郑化安解红娟尚建选
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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