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Manganese-added barium zirconate particles

A technology of barium zirconate and particles is applied in the field of barium zirconate particles added with manganese, which can solve the problems of low crystallinity and low activity, and achieve the effect of high crystallinity and high specific surface area.

Active Publication Date: 2021-12-17
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This leads to low crystallinity, or low activity of miscible manganese-added barium zirconate as an organic decomposition catalyst

Method used

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  • Manganese-added barium zirconate particles
  • Manganese-added barium zirconate particles
  • Manganese-added barium zirconate particles

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0067] (Manufacture of wet filter cake of mixed hydroxide of zirconium and manganese)

[0068] In a glass beaker, 295.29 g of zirconium oxychloride 8 hydrate (manufactured by Yoneyama Pharmaceutical Co., Ltd.) and 18.62 g of manganese chloride 4 hydrate (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) were added to 2 L of ion-exchanged water, Stirring was performed to dissolve zirconium oxychloride octahydrate and manganese chloride tetrahydrate in water to obtain a mixed aqueous solution of zirconium salt and manganese salt. Next, 79.98 g of sodium hydroxide (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) and 4 L of ion-exchanged water were added to a nylon beaker, stirred and dissolved to obtain an aqueous sodium hydroxide solution.

[0069] In a separate beaker equipped with a stirrer to which 1 L of ion-exchanged water was added, the above-mentioned mixed aqueous solution was added at a rate of 30 mL / min using a tube pump, and added to the abov...

Embodiment 1

[0078] (Process (a))

[0079] Weigh 51.25 g of the wet cake of the mixed hydroxide of zirconium and manganese obtained in Production Example 1 above and 18.92 g of barium hydroxide octahydrate (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) into a titanium container, and add ion Exchange 0.09L of water, and further add 10mL of the seed crystal crushing slurry obtained in the above-mentioned Production Example 1 (0.00040 moles in terms of seeds, 1 mole part relative to 100 mole parts of the total mole parts of zirconium and manganese in the first slurry) parts), stirred to make the first slurry.

[0080] (Process (b))

[0081] The aforementioned titanium container was placed in an autoclave, heated at 200°C for 2 hours, and a mixed hydroxide of zirconium and manganese was hydrothermally reacted with barium hydroxide in the presence of the pulverized seed crystal.

[0082] (Process (c))

[0083] The slurry obtained in this way was transferred to a polyethylene ...

Embodiment 2

[0086] 0.33 g (0.0012 mol) of the seed particles obtained in Production Example 1 above was weighed into a plastic container with a capacity of 100 mL, and 8 mL of ion-exchanged water was added to prepare a slurry. After adding 8 mL of zirconia beads with a diameter of 1.0 mm to this slurry, it was installed in a planetary ball mill (P-5 manufactured by Fritsch Co., Ltd.) and operated at a rotation speed of 210 rpm for 1 hour to wet-grind the slurry. The beads were separated from the slurry using a sieve, the beads were washed with 2 mL of ion-exchanged water, and the washing water was returned to the slurry so that the total volume of the slurry was 10 mL. In this way, a pulverized slurry of seed crystals having an average particle diameter of 0.26 μm and a slurry concentration of 0.033 g / mL (0.00012 mol / mL) was obtained.

[0087] 10 mL of pulverized slurry using the above-mentioned seeds (0.0012 moles as seed crystals, 3 mole parts relative to 100 mole parts of the total mol...

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Abstract

Provided are barium zirconate particles to which manganese is added, which have high crystallinity and can be suitably used as an organic matter decomposition catalyst, and which have a manganese-to-zirconium replacement rate of 8 mol% or more and are fine and have a crystallite diameter / specific surface area converted particle diameter in the range of 0.3-1.1. The barium zirconate particles to which manganese is added according to the present invention are represented by the compositional formula (I) BaZr1-xMnxO3-delta (in formula (I), x is a number satisfying 0.08 <= x <= 0.25, and delta represents the amount of oxygen vacancies), and the crystallite size / specific surface area-converted particle size is in the range of 0.3-1.1.

Description

technical field [0001] The present invention relates to manganese-added barium zirconate particles. Specifically, it relates to manganese-added barium zirconate particles having a substitution ratio of manganese to zirconium of 8 mol % or more, fine, highly crystalline, and suitable for use as an organic matter decomposition catalyst. particle. Background technique [0002] Manganese-added barium zirconate particles are known as an organic substance decomposition catalyst for thermally decomposing organic substances (see Patent Document 1). The manganese-added barium zirconate particles are produced by a solid-phase method. That is, for example, barium carbonate, zirconia and trimanganese tetraoxide (Mn 3 o 4 ) heat treatment at 1100°C with the molar ratio of Ba:Zr:Mn being 1:0.9:0.1, molding the obtained powder, firing at 1100°C, and crushing to obtain 10 mol% of zirconium Manganese-substituted barium zirconate particles added with manganese. [0003] Manganese-added b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J35/10B01J37/10F23G7/07
CPCB01J23/34B01J23/002B01J37/10F23G7/07B01J2523/00B01J35/612B01J35/613B01J2523/25B01J2523/48B01J2523/72
Inventor 佐藤秀人
Owner MURATA MFG CO LTD
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