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Photocatalyst and its preparing process

A photocatalyst and activation treatment technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems affecting applications and achieve the goal of increasing hydrogen production rate Effect

Inactive Publication Date: 2009-05-13
XIAMEN UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0003] In short, the addition of sacrificial agents and the need for ultraviolet light source irradiation are the two main problems affecting the practical application of photocatalytic water splitting hydrogen production and carbon dioxide photocatalytic reduction to organic matter.

Method used

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  • Photocatalyst and its preparing process
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Experimental program
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Embodiment 1

[0017] Embodiment 1: preparation concentration is respectively 0.5mol / L lanthanum nitrate solution and cobalt nitrate solution, in molar ratio, La: Co: citric acid=1: 1: 0.6, lanthanum nitrate solution and cobalt nitrate solution are mixed with citric acid, Gel was formed under the irradiation of infrared lamps, precalcined at 400°C for 2 hours, and calcined at 800°C for 4 hours to obtain perovskite LaNiO 3 . NeO 3 The activation treatment is carried out in a small fixed-bed reactor, under normal pressure, the activation temperature is 600°C, and the activation gas is CO in molar ratio. 2 :H 2 =1:3, activation volume space velocity 2100h -1 , activation time 3h, to get Ni / La 2 o 2 CO 3 . Perovskite LaNiO 3 For XRD patterns before and after activation, see figure 1 , Ni / La 2 o 2 CO 3 UV-Vis Diffuse Reflectance Spectrum See figure 2 .

[0018] 0.1g Ni / La 2 o 2 CO 3 Catalyst and 100ml deionized water were put into the reactor, the reaction was carried out under ...

Embodiment 2

[0021] Embodiment 2: prepare respectively lanthanum nitrate and nickel nitrate concentration and be 0.2mol / L solution, in molar ratio, La: Ni: citric acid=1: 1: 2, lanthanum nitrate solution and nickel nitrate solution are mixed with citric acid, in A gel is formed under the irradiation of an infrared lamp, precalcined at 380°C for 2 hours, and calcined at 750°C for 4 hours to obtain the perovskite LaNiO 3 , LaNiO 3 Activation is carried out in a small fixed bed reactor, the activation pressure is 2MPa, the activation temperature is 500°C, and the activation gas is CO in molar ratio. 2 :H 2 =1:4, activation volume space velocity 3000h -1 , activation time 6h, to get Ni / La 2 o 2 CO 3

[0022] For photocatalytic activity evaluation, take 0.3g photocatalyst and put it into the reactor, and feed 40ml / min CO continuously before the reaction 2 , 60min, all the other are with embodiment 1. The yields of hydrogen production and carbon dioxide reduction to formic acid and forma...

Embodiment 3

[0023] Embodiment 3: prepare respectively lanthanum nitrate and nickel nitrate concentration and be 0.4mol / L solution, by molar ratio, La: Ni: citric acid=1: 1: 1.2, get a certain amount of lanthanum nitrate solution and nickel nitrate solution and citric acid Mixing, forming a gel under the irradiation of infrared lamps, pre-calcining at 400°C for 2 hours, and roasting at 750°C for 4 hours to obtain perovskite LaNiO 3 , LaNiO 3 Activation is carried out in a small fixed-bed reactor, the activation pressure is 1MPa, the activation temperature is 700°C, and the activation gas is CO in molar ratio. 2 :H 2 =1:5, activation hourly space velocity 2500h -1 , activation time 4h, to get Ni / La 2 o 2 CO 3

[0024] For photocatalytic activity evaluation, take 0.2g of photocatalyst and put it into the reactor, and feed 80ml / min CO continuously before the reaction 2 , 30min, all the other are with embodiment 1. The yields of hydrogen production and carbon dioxide reduction to formi...

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Abstract

The invention provides a photocatalyst and a preparation method thereof, and particularly relates to a reducing catalyst for hydrogen production via water decomposition and carbon dioxide reduction at the same time under visible light photocatalysis and a preparation method thereof. The invention provides a photocatalyst for photocatalytic reduction of carbon dioxide to organic matters and simultaneously hydrogen production via water decomposition under sunlight. The photocatalyst is Ni / La2O2CO3. The preparation method comprises the following steps: preparing a lanthanum nitrate solution and a nickel nitrate solution respectively, synthesizing LaNiO3 by the conventional complexation method, that is, mixing the lanthanum nitrate solution, the nickel nitrate solution and citric acid and allowing reactions under infrared radiation to form a gel, pre-calcining and calcining the gel to obtain perovskite LaNiO3, and activating the perovskite LaNiO3 in a fixed bed reactor to obtain the finial Ni / La2O2CO3.

Description

technical field [0001] The invention relates to a photocatalyst, in particular to a photocatalytic simultaneous water splitting hydrogen production and carbon dioxide reduction catalyst under visible light and a preparation method thereof. Background technique [0002] With the development of the economy, the shortage of fossil energy such as petroleum and the excessive emission of carbon dioxide greenhouse gas have become two major energy and environmental problems faced by all countries in the world today. In recent years, photocatalytic technology has made great progress in solving energy and environmental problems. The use of photocatalytic water splitting to produce hydrogen is one of the key research areas for the development of renewable and clean energy. The photocatalytic reduction of carbon dioxide to organic matter is one of the important ways for the conversion and utilization of carbon dioxide. Chinese patent ZL01127860.9 introduces a method for photocatalytic ...

Claims

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Application Information

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IPC IPC(8): B01J23/83
Inventor 贾立山张鹏李清彪高敬方维平李娟娟
Owner XIAMEN UNIV
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