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Precious metal-free dolomite catalyst and preparation method and application thereof

A technology of dolomite and precious metals, applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., which can solve problems such as cracking catalyst poisoning, poor catalytic selectivity, and insufficient mechanical strength , to achieve the effect of not easy poisoning, stable performance, high mechanical strength and stability

Pending Publication Date: 2020-03-31
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These compositions are very likely to cause poisoning of the cracking catalyst, so the rapid deactivation of the cracking catalyst is inevitable, and the use of artificially synthesized catalysts and noble metal catalysts not only has high preparation costs, but also increases the cost due to frequent regeneration.
In the prior art, natural ore catalysts generally have problems such as poor catalytic selectivity and insufficient mechanical strength.

Method used

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  • Precious metal-free dolomite catalyst and preparation method and application thereof
  • Precious metal-free dolomite catalyst and preparation method and application thereof
  • Precious metal-free dolomite catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Select natural dolomite as raw material and pretreat it: grind the dolomite, soak it with deionized water, filter, dry at 100°C for 24h, vacuumize (vacuum degree is 0.07MPa, time 6h), grind Cross 120 mesh sieves to obtain dolomite powder; use nickel nitrate, iron nitrate (the mass ratio of the two in the precursor solution is 1:1.3, nickel nitrate 3%, iron nitrate 3.9%) and water to configure the precursor solution, and the Ni load is controlled as 2%, the Fe load is 4% (that is, the content of nickel oxide after calcination is 2%, and the content of iron oxide is 4%), and the equal volume impregnation method is used to impregnate dolomite powder (ultrasonic 6h, total impregnation time 24h), and then Dry, grind, and pass through a 120-mesh sieve; add 8% of the binder aluminum sol, 2% of the thickener methyl cellulose, and 1% of the extrusion aid kale powder to the 89% of the impregnated powder according to the mass percentage, and add an appropriate amount Deionized wat...

Embodiment 2

[0064] Select natural dolomite as raw material and pretreat it: grind the dolomite, soak it with deionized water, filter, dry at 110°C for 22h, vacuumize (vacuum degree is 0.08MPa, time 8h), grind Cross 100 mesh sieves to obtain dolomite powder; use nickel nitrate, iron nitrate (the mass ratio of the two in the precursor solution is 1:1.2, nickel nitrate 2.4%, iron nitrate 2.88%) and water to configure the precursor solution, and the Ni load is controlled as 1%, the Fe load is 2% (that is, the content of nickel oxide after calcination is 1%, and the content of iron oxide is 2%), and the equal volume impregnation method is used to impregnate dolomite powder (ultrasonic 5h, total impregnation time 20h), and then Dry, grind, and pass through a 100-mesh sieve; add 10% of binder silica sol, 3% of thickener methyl cellulose, and 2% of extrusion aid kale powder to 85% of the impregnated powder according to the mass percentage, and add appropriate amount Deionized water, and 8ml / 100g ...

Embodiment 3

[0067] Select natural dolomite as raw material and pretreat it: grind the dolomite, soak it with deionized water, filter, dry at 120°C for 20h, vacuumize (vacuum degree is 0.10MPa, time 10h), grind Cross 110 mesh sieves to obtain dolomite powder; use nickel nitrate, ferric nitrate (the mass ratio of the two in the precursor solution is 1:1.4, nickel nitrate 9%, ferric nitrate 12.6%) and water to configure the precursor solution, and the Ni load is controlled as 5%, the Fe load is 10% (that is, the content of nickel oxide after calcination is 5%, and the content of iron oxide is 10%), using the equal volume impregnation method, impregnating dolomite powder (ultrasonic 10h, total impregnation time 28h), and then Drying, grinding, and passing through a 110-mesh sieve; according to the mass percentage, add 5% of the binder pseudo-boehmite, 1% of the thickener methylcellulose, and 0.5% of the extrusion aid scallop powder to 93.5% of the impregnated powder , add an appropriate amoun...

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Abstract

The invention provides a precious metal-free dolomite catalyst as well as a preparation method and application thereof. The precious metal-free dolomite catalyst is prepared from the following raw materials in percentage by mass: 85%-93.5% of nitrate-loaded dolomite, 5%-10% of a binder, 1%-3% of a thickener and 0.5%-2% of an extrusion aid, wherein the nitrate at least comprises nickel nitrate. Thepreparation method of the precious metal-free dolomite catalyst comprises the following steps: mixing the nitrate-loaded dolomite, the binder, the thickener, the extrusion aid and water to obtain a pug, and carrying out extrusion molding, drying and calcining to obtain the precious metal-free dolomite catalyst. The precious metal-free dolomite catalyst is used for catalytic cracking of coal pyrolysis oil gas. The precious metal-free dolomite catalyst provided by the invention has the advantages of good catalytic activity and stability, high mechanical strength and low cost.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a noble metal-free dolomite catalyst and its preparation method and application. Background technique [0002] The coal chemical industry, which uses coal as raw material and realizes the comprehensive utilization of coal through chemical processing, has risen rapidly in China. Among them, coal pyrolysis is the most common coal processing and utilization technology, which can convert coal into gas, liquid and solid products, and improve resource utilization efficiency. However, the pyrolysis crude gas contains heavy tar, especially the oil and gas produced by the rapid pyrolysis of high-volatile coal has more high-boiling components and poor quality, and is easy to bond with dust and other substances to form tar residue, causing pipeline blockage , Corrosion equipment and other problems, resulting in system security risks. Therefore, realizing the "cleaning" of tar is the key to the de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J27/25B01J27/232B01J37/02B01J37/08C10G11/02C10G11/04
CPCB01J23/755B01J27/25B01J27/232B01J37/0201B01J37/0018C10G11/02C10G11/04
Inventor 梁鹏张亚青孟德昌焦甜甜张华伟张文睿高俊强
Owner SHANDONG UNIV OF SCI & TECH
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