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Rb ion substituted OMS-2 catalyst as well as preparation method and application thereof

An OMS-2, ion substitution technology, applied in separation methods, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low low-temperature catalytic activity and limited improvement range, and achieve improved activity, reduced production costs, Easy-to-use effects

Inactive Publication Date: 2018-09-07
HUAZHONG AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the low-temperature catalytic activity of unmodified OMS-2 is generally very low. The existing methods of modifying the physical and chemical properties of OMS-2 by metal substitution have improved the low-temperature catalytic activity of OMS-2 to a certain extent, but the improvement rate is still very low. limited

Method used

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  • Rb ion substituted OMS-2 catalyst as well as preparation method and application thereof
  • Rb ion substituted OMS-2 catalyst as well as preparation method and application thereof
  • Rb ion substituted OMS-2 catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) The potassium permanganate that takes 0.02mmol is dissolved in the distilled water of 100mL, dissolves under magnetic stirrer;

[0029] (2) 0.001mmol of rubidium nitrate (the Rb salt can be one or more of rubidium nitrate, rubidium chloride, rubidium sulfate, rubidium acetate, rubidium fluoride, rubidium carbonate, rubidium iodide) and 0.5 The sulfuric acid of mL (this acid can be the mixing of one or more in nitric acid, hydrochloric acid, sulfuric acid, phosphoric acid, hypochlorous acid, citric acid, acetic acid, hydrofluoric acid, oxalic acid) joins step (1) middle solution successively, mix;

[0030] (3) Add 0.01 mmol of manganese nitrate to the solution of step (2), mix well, then seal the mouth of the beaker with plastic wrap, and react at 70°C for 24 hours.

[0031] (4) After the reaction is completed, the substrate obtained by the above reaction is washed with distilled water until the conductivity is 100 μs / cm; the washed sample is dried at 50°C to obtain...

Embodiment 2

[0037] (1) The potassium permanganate that takes 0.02mmol is dissolved in the distilled water of 100mL, dissolves under magnetic stirrer;

[0038] (2) The sulfuric acid of the rubidium nitrate of 0.003mmol and the sulfuric acid of 0.5mL successively joins the solution in step (1), mixes;

[0039] (3) Add 0.01 mmol of manganese nitrate to the solution of step (2), mix well, then seal the mouth of the beaker with plastic wrap, and react at 70°C for 24 hours.

[0040] (4) After the reaction is finished, the substrate obtained by the above reaction is washed with distilled water until the conductivity is 100 μs / cm; the washed sample is dried at 50°C to obtain the 0.1Rb-OMS-2 catalyst.

[0041] Catalyst phase identification: the XRD collection of illustrative plates of the catalyst that embodiment 2 obtains is as figure 1 As shown, it is a cryptopotassium manganese ore structure.

[0042] Catalyst activity evaluation: the concentration of benzene is 2000mg / m 3 , Airspeed 48000h -...

Embodiment 3

[0044] (1) The potassium permanganate that takes 0.02mmol is dissolved in the distilled water of 100mL, dissolves under magnetic stirrer;

[0045] (2) The sulfuric acid of the rubidium nitrate of 0.006mmol and the sulfuric acid of 0.5mL successively joins the solution in step (1), mixes;

[0046] (3) Add 0.01 mmol of manganese nitrate to the solution of step (2), mix well, then seal the mouth of the beaker with plastic wrap, and react at 70°C for 24 hours.

[0047] (4) After the reaction is finished, the substrate obtained by the above reaction is washed with distilled water until the conductivity is 100 μs / cm; the washed sample is dried at 50°C to obtain the 0.3Rb-OMS-2 catalyst.

[0048] Catalyst phase identification: the XRD collection of illustrative plates of the catalyst that embodiment 3 obtains is as figure 1 As shown, it is a cryptopotassium manganese ore structure.

[0049] Catalyst activity evaluation: the concentration of benzene is 2000mg / m 3 , Airspeed 48000h ...

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Abstract

The invention discloses an Rb ion substituted OMS-2 catalyst as well as a preparation method and application thereof. The catalyst comprises an OMS-2 carrier and reactive metal; the reactive metal isRb ions; the Rb ions are loaded in pore canals of the OMS-2 carrier; and a molar ratio of the Rb ions to Mn in the OMS-2 carrier is (0.001-0.5) to 1. The preparation method comprises the following steps of by taking potassium permanganate as an oxidant and manganese nitrate as a reducing agent, introducing an Rb-containing salt solution with a certain concentration into a system, and adopting a mild one-step hydrothermal synthesis method to synthesize the Rb ion substituted OMS-2 catalyst (RB-OMS-2). Through a strategy of substituting K<+> in the pore canals of an OMS-2 molecular sieve by theRb ions, the activity of lattice oxygen in the OMS-2 catalyst is effectively improved, so that the activity of catalytically purifying VOCs is remarkably improved. By adopting the catalyst, the benzene catalytic purification efficiency exceeds 90 percent at 220-240 DEG C.

Description

technical field [0001] The present invention relates to catalyst technology, specifically a kind of Rb ion replacement OMS-2 catalyst and its preparation method and application. Background technique [0002] Volatile organic compounds (volatile organic compounds, VOCs) are one of the common air pollutants, which mainly come from the by-products of petrochemical production, paint coatings, electronic chemical industry and other industries, not only have obvious toxic effects on the human body (such as irritating , teratogenic, carcinogenic, mutagenic, etc.), but also has multiple environmental effects (such as photochemical smog, ozone layer destruction, secondary organic aerosols, etc.). In the past few decades, thermal catalytic oxidation technology has been paid attention to because of its high efficiency in treating VOCs exhaust gas, no secondary pollution, and no adsorption saturation. However, the currently widely used catalysts are mainly catalysts loaded with noble m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01D53/86B01D53/72
CPCB01D53/86B01D53/8668B01D2257/7027B01J23/002B01J23/34Y02A50/20Y02C20/30
Inventor 侯静涛董坤婷李磊沙振杰汪明霞谭文峰
Owner HUAZHONG AGRI UNIV
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