Natural gas partial oxidation catalyst prepared by making hydrotalcite as predecessor

A technology for oxidation catalysts and precursors, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, inorganic chemistry, etc., can solve the problems of rare materials, low reaction activity, low catalyst activity, etc. To achieve the effect of high selectivity and high reactivity

Inactive Publication Date: 2006-02-22
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The core of this technology is the use of highly active catalysts. The ideal catalyst system is a rhodium-based and molybdenum carbide system. However, the rareness, instability and kinetic limitations of materials prevent this catalyst system from being used in industry.
Another type of catalyst system is nickel-based catalysts, which have the obvious advantages of high activity and the disadvantages of severe carbon deposition and rapid deactivation. The nickel / alumina catalyst prepared by the sol-gel method has small nickel particles and high dispersion. Good stability, but low catalyst activity
The nickel catalyst prepared by using calcium aluminate modified alumina as a carrier has high catalyst activity, but limited by the preparation method, the nickel particles are larger and the reactivity is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1. Synthesis of Ni, Mg, Al-HTlc

[0018] Weigh 31.14 grams of Ni(NO 3 ) 2 ·6H 2 O, 358.3g Mg(NO 3 ) 2 ·6H 2 O and 279.5 g Al(NO 3 ) 3 ·9H 2 O is dissolved in 1300ml pure water; 263.6g of NaOH is weighed and dissolved in 1500ml pure water. In N 2 Under protection, the salt solution and the NaOH solution were added dropwise to a 5-liter three-necked round-bottom flask at the same time, the dropping rate was controlled, and the pH was maintained at a specific value, and the NiMgAl-HTlc sliding layered composite hydroxide was synthesized by the constant pH method. During the dripping process, it was accompanied by vigorous stirring, and the dripping was completed in about 90 minutes. The reaction solution was kept stirring for 2 hours. It was then aged at 80°C for 18 hours and filtered to obtain a solid powder.

Embodiment 2

[0019] Example 2. Synthesis of Ni, Mg, Al-HTlc

[0020] Weigh 155.7 grams of Ni(NO 3 ) 2 ·6H 2 O, 315.2g Mg(NO 3 ) 2 ·6H 2 O and 91.94 grams of Al(NO 3 ) 3 ·9H 2 O is dissolved in 1200ml pure water; 214.1g NaOH is weighed and dissolved in 1500ml pure water. Under the protection of N2, the salt solution and the NaOH solution were added dropwise to a 5-liter three-necked round-bottomed flask at the same time to control the dropping rate and maintain the pH at a specific value. The NiMgAl-HTlc layered composite hydroxide was synthesized by the constant pH method. During the dripping process, it was accompanied by vigorous stirring, and the dripping was completed in about 90 minutes. The reaction solution was kept stirring for 2 hours. It was then aged at 80°C for 18 hours and filtered to obtain a solid powder.

Embodiment 3

[0021] Example 3. Synthesis of Ni, Mg, Fe, Al quaternary layered structure compound

[0022] Weigh 31.15 grams of Ni(NO 3 ) 2 ·6H 2 O, 338.4 g Mg(NO 3 ) 2 ·6H 2 O, 197.9 grams of Al(NO 3 ) 3 ·9H 2 O and 71.23 g Fe(NO 3 ) 2·9H 2 O is dissolved in 1400ml pure water; 249.6g of NaOH is weighed and dissolved in 1600ml pure water. Under the protection of N2, the salt solution and NaOH solution were added dropwise to a 5-liter three-necked round bottom flask at the same time, the dropping rate was controlled and the pH was maintained at a specific value, and the NiMgFeAl-HTlc layered composite hydroxide was synthesized by the constant pH method. During the dripping process, it was accompanied by vigorous stirring, and the dripping was completed in about 90 minutes. The reaction solution was kept under stirring for 2 hours. It was then aged at 80°C for 18 hours and filtered to obtain a solid powder.

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PUM

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Abstract

The invention provides an oxidative catalyst prepared with hydrotalcite as the forerunner material, which comprises (wt %): 5- 40% NiO, 5- 15% Fe2O3, and the rest being MgO, Al2O3, and the oxides of other transient metal element, the mole ratio of divalent metallic ion to trivalent metal ion in whole oxides being among 1: 1- 10: 1. The catalyst has a perfect reaction activity and a high selectivity.

Description

(1) Technical field: [0001] The invention relates to the field of catalyst synthesis and natural gas conversion. (2) Background technology [0002] Convert natural gas to syngas (CO and H 2 ), and then synthesize clean gasoline and diesel fuel without sulfur and nitrogen impurities from F-T, or synthesize important products such as methanol and methyl ether is one of the most important ways of natural gas conversion. [0003] The traditional method of converting natural gas into synthesis gas is to produce CO and H by reacting steam with natural gas. 2 The reaction is an endothermic reaction, which requires a higher reaction temperature and consumes a lot of heat. The ideal reaction path is to directly use O 2 The reaction with natural gas is a slightly exothermic reaction, the reaction conditions are mild, and the synthesis gas composition is appropriate, which can simplify the subsequent synthesis gas composition adjustment steps. The core of this technology is the use of highl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/76C01B3/40
CPCY02P20/52
Inventor 苏继新王吉顺包南蒋政魏茂坤殷永泉王仲鹏牟真聂玉伦
Owner SHANDONG UNIV
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