Molybdenum oxide and preparation method and application thereof

A technology of molybdenum oxide and molybdenum concentrate, which is applied in the field of molybdenum oxide, can solve the problems of low activity of supplementary catalyst and failure of catalyst to run stably and efficiently for a long period of time

Pending Publication Date: 2021-12-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example CN1061163A discloses a kind of supplementary catalyst that keeps the active stability of acrylonitrile fluidized bed molybdenum series catalyst. The composition of each element of this supplementary catalyst is the same as or close to that of the original molybdenum series catalyst, and only the content of molybdenum is higher than that of the original molybdenum series. It is a catalyst, but with this method, the activity of the added catalyst is not high, and the single-pass yield of acrylonitrile is below 78%, which cannot make the catalyst run stably and efficiently for a long period of time

Method used

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  • Molybdenum oxide and preparation method and application thereof
  • Molybdenum oxide and preparation method and application thereof
  • Molybdenum oxide and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0075] (1) The preparation method of molybdenum series catalyst:

[0076] Add 15 grams of water to 8.12 grams of potassium hydroxide and dissolve after heating to obtain material I; 319.1 grams of ammonium heptamolybdate (NH 4 ) 6 Mo 7 o 24 4H 2 O was dissolved in 300 grams of 80°C hot water to obtain material II; 109.1 grams of bismuth nitrate Bi(NO 3 ) 3 ·5H 2 O, 177.0 grams of calcium nitrate Ca (NO 3 ) 2 4H 2 O, 242.2 grams of nickel nitrate Ni (NO 3 ) 2 ·6H 2 O, 110.1 grams of iron nitrate Fe (NO 3 )3 9H 2 O, 162.8 grams of neodymium nitrate Nd (NO 3 ) 3 ·6H 2 O is mixed, and 120 grams of water is added, heated and dissolved as material III.

[0077] Mix material I with 1250 grams of silica sol with a weight concentration of 40%, add material II and material III in turn under stirring, and obtain a slurry after thorough stirring, heat-treat the slurry at 100°C for 25 minutes, and then follow the usual method The heat-treated slurry is formed into microsp...

Embodiment 2

[0095] (1) The preparation method of molybdenum series catalyst:

[0096] Add 15 grams of water to 8.14 grams of potassium hydroxide and dissolve after heating to obtain material I; 319.9 grams of ammonium heptamolybdate (NH 4 ) 6 Mo 7 o 24 4H 2 O was dissolved in 300 grams of hot water at 80°C to obtain material II; 109.3 grams of bismuth nitrate Bi(NO 3 ) 3 ·5H 2 O, 177.4 grams of calcium nitrate Ca (NO 3 ) 2 4H 2 O, 242.8 grams of nickel nitrate Ni (NO 3 ) 2 ·6H 2 O, 110.4 grams of iron nitrate Fe (NO 3 ) 3 9H 2 O, 161.8 grams of praseodymium nitrate Pr (NO 3 ) 3 ·6H 2 O is mixed, and 120 grams of water is added, heated and dissolved as material III.

[0097] Mix material I with 1250 grams of silica sol with a weight concentration of 40%, add material II and material III in turn under stirring, and obtain a slurry after thorough stirring, heat-treat the slurry at 100°C for 25 minutes, and then follow the usual method The heat-treated slurry is formed into...

Embodiment 3

[0105] (1) The preparation method of molybdenum series catalyst:

[0106] Add 15 grams of water to 8.12 grams of potassium hydroxide and dissolve after heating to obtain material I; 319.0 grams of ammonium heptamolybdate (NH 4 ) 6 Mo 7 o 24 4H 2 O was dissolved in 300 grams of hot water at 80°C to obtain material II; 109.0 grams of bismuth nitrate Bi(NO 3 ) 3 ·5H 2 O, 176.9 grams of calcium nitrate Ca (NO 3 ) 2 4H 2 O, 242.1 grams of nickel nitrate Ni (NO 3 ) 2 ·6H 2 O, 110.1 grams of iron nitrate Fe (NO 3 ) 3 9H 2 O, 159.4 grams of neodymium nitrate Nd (NO 3 ) 3 ·6H 2 O, 3.2 grams of ytterbium nitrate Yb (NO 3 ) 3 ·5H 2 O is mixed, and 120 grams of water is added, heated and dissolved as material III.

[0107] Mix material I with 1250 grams of silica sol with a weight concentration of 40%, add material II and material III in turn under stirring, and obtain a slurry after thorough stirring, heat-treat the slurry at 100°C for 25 minutes, and then follow the...

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Abstract

The invention provides molybdenum oxide as well as a preparation method and application thereof. The molybdenum oxide provided by the invention contains a silicon element, and the mass content of silicon is 0.8%-3.5%. According to the XRD spectrogram of the molybdenum oxide, the molybdenum oxide crystal phase 2theta has the strongest peak at 25.8 + / -1 degrees, the second strongest peak at 12.8 + / -1 degrees and the third strongest peak at 39.1 + / -1 degrees. The molybdenum oxide provided by the invention and a molybdenum catalyst form a supplementary system, and the supplementary system is used in a continuous supplement process of propylene ammoxidation reaction, so that a higher acrylonitrile yield can be obtained under a higher propylene load, and the acrylonitrile yield is kept stable for a long time.

Description

technical field [0001] The invention relates to a molybdenum oxide material, in particular to a molybdenum oxide used in a supplementary system for the reaction of propylene ammoxidation to acrylonitrile. Background technique [0002] Molybdenum is a transition group element, which is widely used in the catalyst industry because of its special properties. Among them, molybdenum oxide is an important oxide. Studies have found that molybdenum trioxide with anisotropy shows its special catalytic properties and can be widely used as a catalyst, such as for the synthesis of low-carbon alcohols and Partial oxidation catalysts, especially in the selective oxidation of hydrocarbons and ammoxidation, catalysts with molybdenum trioxide as the main component have been widely studied and applied because of their high activity and selectivity. At present, the existing synthesis methods of molybdenum oxide include hydrothermal method, sol-gel method, co-precipitation method and vapor pha...

Claims

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Application Information

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IPC IPC(8): B01J23/887B01J27/192B01J35/02B01J37/03B01J37/08C07C253/26C07C255/08C01G39/02
CPCB01J23/8876B01J27/192B01J23/002B01J37/031B01J37/082C07C253/26C07C255/08C01G39/02B01J2523/00C01P2002/72C01P2004/61B01J35/50B01J2523/13B01J2523/23B01J2523/3725B01J2523/41B01J2523/54B01J2523/68B01J2523/842B01J2523/847B01J2523/3718B01J2523/3787B01J2523/14B01J2523/22B01J2523/51B01J2523/845Y02P20/52
Inventor 张顺海吴粮华李静霞
Owner CHINA PETROLEUM & CHEM CORP
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