Preparation method of hexaaluminate catalysts with high specific surface areas

A high specific surface area, hexaaluminate technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of specific surface area loss and achieve crystal grain The effect of small size, easy scale production, and high specific surface area

Inactive Publication Date: 2018-06-01
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the serious loss of specific surface area of ​​hexaaluminate catalysts at higher phase formation temperatures, the purpose of the present invention is to provide a hexaaluminate catalyst AAl with a high specific surface area 12-x B x o 19-δ The preparation method of this method has low raw material price and simple operation

Method used

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  • Preparation method of hexaaluminate catalysts with high specific surface areas
  • Preparation method of hexaaluminate catalysts with high specific surface areas
  • Preparation method of hexaaluminate catalysts with high specific surface areas

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Embodiment 1

[0030] 1.629g of La 2 o 3 Dissolve completely in excess nitric acid solution to produce La(NO 3 ) 3 solution, 3.579g of Mn(NO 3 ) 2 solution (mass fraction is 50%) and 41.681g of Al(NO3 ) 3 9H 2 O is sequentially added to La(NO 3 ) 3 In the solution, after the nitrate was completely dissolved, 66.749g of sucrose was added, and the solution was continuously stirred under heating at 100°C until the solution evaporated and concentrated to a yellow viscous sol. Afterwards, the obtained sol was dried in an oven at 120° C. for 12 hours, and the sol foamed and expanded to become a fluffy brown precursor. After grinding the precursor into powder, first raise the temperature to 1100°C at 3°C / min in an argon atmosphere and keep it warm for 2 hours, then switch the argon gas to air and continue to keep warm at 1100°C for 5 hours, cool down and pulverize by ball milling Get LaMnAl 11 o 19-δ Hexaaluminate catalyst.

[0031] determined, as Figure 1 to Figure 4 As shown, the ob...

Embodiment 2

[0033] The difference from Example 1 is that the temperature of roasting and calcination is 1200°C, and the rest are the same. determined, as figure 1 Shown, the position of the characteristic peak of the XRD spectrogram of catalyst is the same as embodiment 1, does not exist such as Al 2 o 3 Miscellaneous phases were obtained with a single hexaaluminate compared to a surface area of ​​42m 2 / g LaMnAl 11 o 19-δ Hexaaluminate catalyst.

Embodiment 2

[0035] The difference with Example 1 is that, according to the general formula AAl 12-x B x o 19 Among them, x=0 is used for batching, and the rest are the same. After determination, the obtained LaAl 12 o 19 The characteristic peaks of the XRD spectrum of the hexaaluminate catalyst are compared with the standard XRD characteristic peaks of the hexaaluminate phase, which does not exist such as Al 2 o 3 Miscellaneous phases, with a single hexaaluminate phase, additionally, a specific surface area of ​​49m 2 / g.

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Abstract

The invention discloses a preparation method of hexaaluminate catalysts AAl12-xBxO19-delta with high specific surface areas. The preparation method comprises the following steps: (1) weighing nitratescorresponding to elements A, B and Al according to a stoichiometric ratio, dissolving the weighed nitrates into deionized water to prepare corresponding nitrate mixed solutions; (2) adding a certainamount of saccharides into the nitrate mixed solutions prepared in the step (1), heating, and stirring to form sols; then, drying the sols to obtain precursors; (3) heating the precursors, obtained inthe step (2), up to 800-1500 DEG C in an inert atmosphere, and roasting; then, calcining in an oxidizing atmosphere, cooling and then crushing to obtain the hexaaluminate catalysts with high specificsurface areas. According to the preparation method, a carbon coating layer, formed by roasting in the inert atmosphere, is used for preventing excessive growth and aggregation of the crystal grains,a carbon layer is removed by calcining in an air atmosphere, and the hexaaluminate catalysts with pure phase structures are further formed; the prepared catalysts have the advantages of being high inspecific surface areas, small in grain sizes and high in methane combustion catalysis activity.

Description

technical field [0001] The invention relates to a nano powder preparation technology, in particular to a preparation method of a high specific surface area hexaaluminate catalyst powder. Background technique [0002] Because of its good thermal stability, strong thermal shock resistance, catalytic activity and good hydrothermal stability, hexaaluminate is often used to catalyze methane high-temperature combustion, methane carbon dioxide reforming and N 2 O decomposition and other fields. The general formula of hexaaluminate is AAl 12 o 19 , A ions are usually composed of alkali metal, alkaline earth metal or rare earth metal ions, such as one or more of La, Ce, Pr, Ca, Sr and Ba elements. At present, in order to further optimize the catalytic activity of hexaaluminate crystals, other transition metal elements, one or more of Mn, Fe, Co, Ni, Cu, and Cr, are usually doped in the crystal phase to partially replace the crystal phase. The aluminum ion on the aluminum ion site...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J23/75B01J23/755B01J23/83B01J35/10
CPCB01J23/34B01J23/75B01J23/755B01J23/83B01J35/613
Inventor 雷泽赵亚欣杨志宾彭苏萍
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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