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Pt-loaded crystallized manganese oxide nanosheet material and preparation method and application thereof

A technology of nanosheets and manganese oxide, applied in the field of porous catalysis and environmental catalysis, can solve problems such as secondary pollution, and achieve the effects of low cost, enhanced catalytic efficiency, and strong low-temperature reducibility

Active Publication Date: 2017-01-04
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention aims at the removal of low-concentration ethylene, solves the problem that the currently used activated carbon adsorbent is likely to cause secondary pollution, and provides a novel catalyst for removing low-concentration ethylene and its preparation method

Method used

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  • Pt-loaded crystallized manganese oxide nanosheet material and preparation method and application thereof
  • Pt-loaded crystallized manganese oxide nanosheet material and preparation method and application thereof
  • Pt-loaded crystallized manganese oxide nanosheet material and preparation method and application thereof

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preparation example Construction

[0055] Preparation of crystallized manganese oxide nanosheet materials. Specifically, potassium permanganate and small molecule organic acids were dissolved in water respectively, mixed uniformly and then stirred at room temperature for 24-78 hours, then filtered, washed with water, and freeze-dried to obtain δ-MnO 2 Nanosheets (or manganese oxide nanosheets). Wherein, the small molecule organic acid only needs to satisfy organic acids with weak reducibility, such as 2-(N-morpholine)ethanesulfonic acid, acetic acid, benzenesulfonic acid, etc. containing hydroxyl or (and) carboxyl groups, etc. properties of organic acids. The molar ratio of the potassium permanganate to the small molecule organic acid may be (0.4˜1):1, for example, 0.665:1. As a detailed example, 2.10g KMnO 4 Dissolve in 120ml of water, dissolve 4.25g of 2-(N-morpholine)ethanesulfonic acid (MES) in 120ml of water, then add potassium permanganate solution dropwise to the MES solution, and stir the obtained so...

Embodiment 1

[0062] 2.10g KMnO 4 Dissolve in 120ml water, dissolve 4.25g MES in 120ml water, then add potassium permanganate solution dropwise into the MES solution, stir the obtained solution at room temperature for 48 hours, then filter and wash with water, and obtain flaky oxidation after freeze-drying. Manganese, as MnO 2 -48h.

[0063] Depend on Figure 1A It can be seen that the manganese oxide nanosheets are crystallized δ-MnO 2 (JCPDS 80-1098), where 2θ=12.5°, 25°, 36.5° and 65.5° correspond to (001), (002), (-111) and (-321) crystal planes, respectively; Figure 1B Visible, N 2 The relative pressure of the adsorption isotherm ranges from 0.1 to 1.0, indicating a mesoporous material. And its specific surface area is 189.1m 2 g -1 ; Figure 1C The TEM shows that it is a layered two-dimensional material. Depend on Figure 1D In the HRTEM picture, the 0.24nm lattice fringes correspond to δ-MnO 2 The (-111) crystal plane, in addition, 0.7nm corresponds to its interlayer dista...

Embodiment 2

[0065] 2.10g KMnO 4 Dissolve 4.25g of MES in 120ml of water, then add potassium permanganate solution dropwise into the MES solution, stir the obtained solution at room temperature for 48 hours, then filter and wash with water, and obtain flaky oxidation after freeze-drying. Manganese, as MnO 2 -48h. Dissolve 0.068g PVP and 0.18g trisodium citrate in 100mL water, place the above solution in a water bath at 80°C, stir vigorously for 5min, add 0.8ml chloroplatinic acid (20mg / ml), add dropwise 10ml containing An aqueous solution of 0.108 g of ascorbic acid was added to the above solution. After 1h there will be dispersed 300mg MnO 2 50 ml of an aqueous solution of -48h material was added to the above solution. After 4 hours of reaction, the centrifugal lotion was removed and freeze-dried to obtain a Pt-loaded manganese oxide material, called Pt / MnO 2 -48h.

[0066] Depend on Figure 2A It can be seen that the manganese oxide catalyst is crystallized δ-MnO 2 (JCPDS 80-1098...

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Abstract

The invention relates to a Pt-loaded crystallized manganese oxide nanosheet material and a preparation method and application thereof. The Pt-loaded crystallized manganese oxide nanosheet material comprises delta-MnO2 nanosheets with the layered crystal structure and metal Pt dispersed into the delta-MnO2 nanosheets, and the loading amount of the metal Pt ranges from 1 wt% to 5 wt%; the valence states of Mn in the delta-MnO2 nanosheets comprise Mn<4+>, Mn<3+> and Mn<2+>, wherein the content of Mn<4+> accounts for 30% to 45% of the total content of Mn. The crystallized manganese oxide nanosheet material comprises the delta-MnO2 nanosheets with the layered crystal structure and has multiple manganese valence states (Mn<2+>, Mn<3+> and Mn<4+>), and Mn<4+> with the high content (the content of Mn<4+> accounts for 30% to 45% of the total content of Mn) plays a key role in ethylene oxidation.

Description

technical field [0001] The invention belongs to the field of porous catalysis and environmental catalysis, and relates to a crystallized manganese oxide nano-sheet material, in particular to a new, green and efficient crystallization catalyst for catalytic oxidation of low-concentration ethylene, and its preparation method and application . Background technique [0002] Two-dimensional nanomaterials are widely used in catalysis, optoelectronics, biomaterial applications, and energy conversion and storage due to their large surface-to-volume ratio and confinement effects at the atomic scale. Among them, graphene, molybdenum disulfide, graphitic carbon nitride and their derivatives have become commonly used two-dimensional materials due to their relatively mature preparation schemes. As for transition metal oxides, so far, they are often used in many fields in the form of 0-dimensional, 1-dimensional or 3-dimensional structures. The key to limiting the application of two-dim...

Claims

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Application Information

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IPC IPC(8): B01J23/656B01D53/86B01D53/72B01D53/44
CPCB01D53/8668B01D53/8687B01J23/6562B01D2257/708B01D2257/702B01J35/40B01J35/635B01J35/638B01J35/615
Inventor 王敏阚晓天张玲霞施剑林
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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