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Prepn. method and application of high-dispersion loading type nickel-based catalyst

A nickel-based catalyst, supported technology, applied in catalyst activation/preparation, physical/chemical process catalyst, bulk chemical production, etc., can solve the problems of complex preparation process and poor repeatability, and achieve good repeatability, strong effect, The effect of high activity and stability

Inactive Publication Date: 2006-03-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process is complicated and the repeatability is poor, and the powder catalyst prepared by the above method needs to be formed through high pressure (600kg / cm2), high temperature (1400K) roasting to increase its mechanical strength and wear resistance (Applied Catalysis A: General 223( 2002) 225.), often cannot be used in fluidized bed reactors with severe wear

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Preparation of complexed nickel ion precursor: Dissolve nickel nitrate or nickel chloride in an appropriate amount of aqueous solution, and then slowly add a certain amount of ligands such as ammonia water, ethylenediamine, ethylenediaminetetraacetic acid, etc. at room temperature, In the preparation process, the molar ratio of nickel and ligand is respectively controlled at nickel: ammonia=1: (1~6), nickel: ethylenediamine=1: (1~3), nickel: ethylenediaminetetraacetic acid=1: 1. During the addition of the ligand, adjust the pH value of the solution to 9-12 by bubbling ammonia. After the addition of the ligand, fully stir at room temperature, and then transfer it to a volumetric flask for later use. Precursor solutions of complexed nickel ions with different concentrations can be prepared by the above method.

[0022] 100 grams of microsphere silica gel (60-80 orders) are added to 180 milliliters respectively, in the aqueous solution of nickel nitrate, nickel ammonium io...

Embodiment 2

[0024] When adopting the nickel acetylacetonate precursor, at first 21.9 grams of nickel acetylacetonate are dissolved in 180 milliliters of ethanol solution, then add 100 grams of microsphere silica gel (60-80 order), the above-mentioned impregnated catalyst is left standstill at room temperature for 6 hours, and then Vacuum dried at 80°C for 6 hours, then fired at 800°C for 4 hours. The above-mentioned finished catalyst was subjected to hydrogen adsorption and transmission electron microscope characterization after hydrogen reduction at 800°C. The results are shown in Table 1.

[0025] Precursor

Embodiment 3

[0027] 100 grams of microsphere aluminum oxide (60-80 mesh) are added to 160 milliliters, in the aqueous solution of nickel nitrate, nickel ammonium complexed, ethylenediamine nickel, edetate nickel containing 5.0 grams of nickel respectively; The impregnated catalyst was allowed to stand at room temperature for 24 hours, then vacuum-dried at 80°C for 24 hours, and then calcined at 800°C for 4 hours. When adopting the nickel acetylacetonate precursor, at first 21.9 grams of nickel acetylacetonate are dissolved in 160 milliliters of ethanol solution, then add 100 grams of microspherical alumina (60-80 mesh), the above impregnated catalyst is left standstill at room temperature for 6 hours, It was then vacuum dried at 80°C for 6 hours, and then fired at 800°C for 4 hours.

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PUM

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Abstract

A high-dispersity carried Ni-base catalyst for reforming, oxidizing, or oxidizing-reforming methane in fluidized bed is prepared by direct dipping to make the Ni ions be carried by microspherical silica gel or alumina. Its advantages are high activity and high stability.

Description

technical field [0001] The invention relates to a preparation method of a loaded nickel-based catalyst with high mechanical strength and high dispersion and its application in methane reforming and oxidation synthesis gas reaction in a fluidized bed reactor. technical background [0002] Synthesis gas (the mixed gas of carbon monoxide and hydrogen) is a very important raw material gas, which can directly synthesize low-carbon alcohols, dimethyl ether, and prepare liquid fuels through Fischer-Tropsch synthesis. Synthesis gas and methanol, synthetic ammonia, hydrogen, etc. prepared by synthesis gas are the basic raw materials for the development of industry and agriculture. At present, the steam reforming process of methane is mainly used in foreign countries to prepare synthesis gas. [0003] Although the steam reforming of methane has been industrialized, the catalyst life is short due to the serious carbon deposition on the nickel-based catalysts currently used and the rap...

Claims

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Application Information

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IPC IPC(8): B01J23/755B01J37/02C01B3/38
CPCY02P20/52
Inventor 侯昭胤高静楼辉费金华郑小明
Owner ZHEJIANG UNIV
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