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Application of silver halide composite materials in preparing carbon dioxide into hydrocarbon under visible-light catalysis

A technology of hydrocarbons and composite materials, which is applied in the preparation of organic compounds, the production of hydrocarbons from carbon oxides, and the preparation of hydroxyl compounds. It can solve the problems of low efficiency and low quantum yield, so as to improve efficiency and enhance response. degree, the effect of light absorption intensity enhancement

Inactive Publication Date: 2011-05-25
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of visible light catalyst catalyzing CO in the prior art. 2 The shortcomings of low efficiency, low quantum yield, and the blank of silver halide materials in this application field provide silver halide in photocatalytic CO 2 Applications in the preparation of hydrocarbons, preferably silver halide composites with high stability and high activity to catalyze CO under visible light conditions 2 Applications for the preparation of hydrocarbon fuels

Method used

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  • Application of silver halide composite materials in preparing carbon dioxide into hydrocarbon under visible-light catalysis
  • Application of silver halide composite materials in preparing carbon dioxide into hydrocarbon under visible-light catalysis
  • Application of silver halide composite materials in preparing carbon dioxide into hydrocarbon under visible-light catalysis

Examples

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Embodiment 1

[0032] real Example 1: Preparation of AgBr composite material

[0033] Add 1 g of GP, EGP, GO, CNT, GAC, Zeolite, TiO 2 The solid powder was separately added to 100 ml of 0.01 mol / L cetyl methyl ammonium bromide (CTAB) aqueous solution, dispersed ultrasonically for 30 minutes, and then stirred with a magnetic stirrer for 30 minutes to obtain a uniformly distributed suspension A. Take 0.0012 mol of AgNO 3 Add to 2.3 ml of NH 4 OH (25 wt.% NH 3 ) Obtain mixed solution B. Then the mixed solution B was quickly added to suspension A, and after magnetic stirring at room temperature for 12 hours, the resulting precipitate was separated by a high-speed centrifuge and washed with ethanol for 5 times, and then dried at 75 °C. Then it was calcined at different temperatures of 200℃, 400℃, 500℃ and 700℃ for 3 hours respectively to obtain 20.0% AgBr / GP, AgBr / EGP, AgBr / GO, AgBr / CNT, AgBr / GAC, AgBr / Zeolite, AgBr / TiO 2 Composite materials. Prepare 1.0%, 10.0%, 30.0% and 50.0% AgBr / GP, AgBr / EGP...

Embodiment 2

[0034] Example 2: AgX / GP visible light catalysis CO 2 Preparation of hydrocarbons

[0035] Visible light catalysis CO 2 The reactor for preparing hydrocarbons adopts a closed cylindrical stainless steel reactor. The stainless steel reactor has its own valve, which is convenient to control the gas input and discharge. In order to facilitate the illumination, there is a sealable round glass window with filters above the stainless steel reactor. A 500 W medium-pressure xenon lamp light source is used as the visible light source to provide visible light with λ≥420 nm. Take 0.5 g of AgBr / GP composite samples synthesized at 1.0%, 10.0%, 20.0%, 30.0% and 50.0% (wt.AgBr / GP) respectively, and disperse them in 100 ml of 0.2 mol / L KHCO 3 A suspension is formed in the solution, and the pH of the solution is adjusted to 8.5 with NaOH. Before the light starts, through the control valve in the stainless steel reactor, the pure CO is continuously introduced into the suspension 2 Gas (puri...

Embodiment 3

[0038] Example 3: AgX / TiO 2 Visible light catalysis CO 2 Preparation of hydrocarbons

[0039] The reaction device adopts the stainless steel reactor described in Example 2, and uses a 500 W medium-pressure xenon lamp light source to provide visible light with λ ≥ 420 nm. Take 0.5 g synthesized 7.0%, 11.6%, 20.0%, 46.4% and 175.0% (wt.AgBr / wt.TiO 2 ) A series of AgBr / TiO 2 Nano catalyst sample, dispersed in 100ml 0.2 mol / L KHCO 3 A suspension is formed in the solution, and the pH of the solution is adjusted to 8.5 with NaOH. Before the light starts, through the control valve in the stainless steel reactor, the pure CO is continuously introduced into the suspension 2 Gas (purity 99.99%) for 30 minutes to remove oxygen in the solution. Then close the control valve and continue to pass in CO 2 The gas maintains the pressure in the reactor at about 7.5 MPa. Switch on the xenon lamp light source under magnetic stirring and continue to irradiate for 5 hours. After the end of t...

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Abstract

The invention discloses an application of silver halide composite materials in preparing carbon dioxide into hydrocarbon under visible-light catalysis. The silver halide composite materials are composed of AgX and conductive carriers, such as graphite (GP), expanded graphite (EGP), graphene oxide (GO), carbon nanotube (CNT), granular activated carbon (GAC), zeolite, TiO2 and the like, thus forming AgX / flake graphite, AgX / EGP, AgX / graphene, AgX / CNT, AgX / GAC, AgX / zeolite and AgX / TiO2 and the like. The invention also discloses a method for preparing the silver halide composite materials, in which the AgX is evenly dispersed on the carrier surfaces with the aid of cationic surfactant by wet co-precipitation. The silver halide composite materials provided by the invention can efficiently utilize the sunlight, wherein the AgX is excitated under the visible light, and electrons generated are transferred from an AgX conduction band to the conductive-carrier surfaces, thus improving catalytic activity and stability of the silver halide composite materials under visible light.

Description

technical field [0001] The invention relates to the application of silver halide composite materials to catalyze carbon dioxide to prepare hydrocarbons under the condition of visible light. Background technique [0002] carbon dioxide (CO 2 ) gases are considered to be the main cause of global warming. An estimated 66% of global warming is attributable to CO 2 . Humans emit 24 billion tons of CO every year 2 to the atmosphere, of which 22 billion tons are due to the burning of fossil fuels, thus reducing CO 2 The emission of emissions has become a focus of attention of countries all over the world. From the perspective of sustainable development, purely relying on the reduction of CO 2 The emission of greenhouse gases is bound to affect the normal development of social economy, so the comprehensive utilization of greenhouse gases is inevitable for economic and social development. Make full use of industrial by-product CO 2 Transformation and fixation are not only ben...

Claims

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Application Information

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IPC IPC(8): B01J27/08B01J32/00C07C31/04C07C31/08C07C9/04C07C29/154C07C1/12
CPCY02P20/52
Inventor 何春苏敏华阿伯阿斯慕达熊亚董汉英黄艳玲夏德华
Owner SUN YAT SEN UNIV
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