Bimetallic catalyst for catalytic oxidation of VOCs and preparation method and application of bimetallic catalyst

A bimetallic catalyst and catalytic oxidation technology, applied in the fields of resources and environment, can solve the problems of hindering the promotion and development of transition metal oxide catalysis, high reaction temperature, low activity, etc., and achieve low cost, high catalytic activity, and stable conversion rate. Effect

Active Publication Date: 2016-02-03
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, studies have shown that supported Pd and Pt catalysts are mostly suitable for the catalytic oxidation of non-chlorinated VOCs, and more toxic high-chlorinated compounds will be generated when oxidizing chlorinated VOCs
Transition metal oxide catalysts have the advantages of low price, good thermal stability, and not easy to deactivate, but in general, due to their lower catalytic activity than noble metal catalysts, high reaction temperature, and high energy consumption, transition metal oxides The promotion and development of catalysis has brought some obstacles

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  • Bimetallic catalyst for catalytic oxidation of VOCs and preparation method and application of bimetallic catalyst
  • Bimetallic catalyst for catalytic oxidation of VOCs and preparation method and application of bimetallic catalyst

Examples

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Embodiment 1

[0060] This example prepares a bimetallic catalyst for catalytic oxidation of VOCs, including a carrier, an active agent and a cocatalyst. The carrier is titanium dioxide, the activator is ruthenium, and the cocatalyst is tricobalt tetroxide. The percentage of the total mass is 1.0 wt%, and the atomic molar ratio of the ruthenium element in the active agent to the cobalt element in the cocatalyst is 1:5.

[0061] The preparation method of described catalyst is as follows (flow process is as follows figure 1 shown):

[0062] (1) Dissolve Salen ligand and cobalt acetate in ethanol (the molar ratio of Salen ligand to cobalt acetate is 1:1), and heat and stir at 50°C for 5 hours to obtain the coordinated single metal Organic compound ethanol solution (wherein the concentration of ethanol solution is 0.5g / mL).

[0063] (2) Ruthenium nitrosyl nitrate is added to the ethanol solution of the monometallic organic compound obtained in step (1) (wherein the mol ratio of ruthenium nitro...

Embodiment 2

[0067] In addition to the percentage of ruthenium element accounting for the total mass of the catalyst in the active agent is 0.2wt%, the atomic molar ratio of the ruthenium element in the activator and the cobalt element in the cocatalyst is 1:1, and the Salen ligand and cobalt acetate in the step (1) The mol ratio is 1:3, the concentration of the ethanol solution in the monometallic organic compound ethanol solution is 0.1g / mL, the ruthenium source described in the step (2) is ruthenium trichloride, the mol ratio of ruthenium trichloride and cobalt acetate The concentration of titanium dioxide in the titanium dioxide slurry in step (3) is 1:1, except that the concentration of titanium dioxide in the slurry of titanium dioxide is 0.1 g / mL, the dosage of other materials and the preparation steps are the same as in Example 1.

[0068] The particle size of the bimetallic active particles of the obtained catalyst is 10nm, and when it catalyzes the simulated flue gas containing 10...

Embodiment 3

[0070] In addition to the percentage of ruthenium element accounting for the total mass of the catalyst in the active agent is 2wt%, the atomic molar ratio of the ruthenium element in the activator and the cobalt element in the cocatalyst is 1:10, in the step (1) the amount of Salen ligand and cobalt acetate The mol ratio is 1:5, and the concentration of the ethanol solution in the monometallic organic compound ethanol solution is 1g / mL, and the mol ratio of ruthenium nitrosyl nitrate and cobalt acetate is 1:10 in the step (2), and titanium dioxide is 1:10 in the step (3). Except that the concentration of titanium dioxide in the slurry is 1g / mL, other material dosages and preparation steps are the same as in Example 1.

[0071]The particle size of the bimetallic active particles of the obtained catalyst is 10nm, and its complete oxidation temperature is 225°C, 210 °C and 215 °C, CO 2 Selectivity ≥ 99%.

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Abstract

The invention provides a bimetallic catalyst for catalytic oxidation of VOCs and a preparation method and application of the bimetallic catalyst. According to the catalyst, titanium dioxide is adopted as a carrier, an active agent is an elementary substance of any one of ruthenium, palladium and platinum and / or an oxide of the elementary substance, and a promoter is any one of cobaltosic oxide, manganese oxide, copper oxide and nickel oxide. Nano particles with the active agent and the promoter evenly compounded are synthesized through a nano regulation means and a Salen ligand, a high concerted catalysis function is achieved between the active agent and the promoter, and the catalytic oxidation efficiency of VOCs can be improved. The catalyst is high activity and high in universality, the complete oxidizing temperature on multiple kinds of VOCs ranges from 160 DEG C to 230 DEG C, the overall performance is superior to that of a commercial palladium-platinum catalyst, the selectivity of final reaction products CO2 is high, and good application prospects are achieved.

Description

technical field [0001] The invention belongs to the technical field of resources and environment, and relates to a bimetallic catalyst for catalyzing and oxidizing VOCs and its preparation method and application, in particular to a nanometer-regulated bimetallic catalyst for catalyzing and oxidizing various VOCs, as well as its preparation method and application. Background technique [0002] Volatile organic compounds (VOCs) are a class of flammable and toxic organic compounds with high saturated vapor pressure and low water solubility, including alkanes, alkenes, aromatic hydrocarbons, alcohols, aldehydes, ketones, halogenated class etc. VOCs come from a wide range of sources, such as petroleum refining, printing and packaging printing, fuel transportation and sales, architectural decoration, and cooking fumes. With the development of global industrialization, the leakage or direct discharge of these pollutants has caused certain harm to the ecological environment and hum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J23/656B01J31/22B01D53/86B01D53/70B01D53/72
Inventor 朱廷钰刘霄龙曾俊淋施文博
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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