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Photocatalyst for preparing hydrogen by visible-light photocatalytic decomposing H2S and preparing method thereof

A photocatalyst and photocatalysis technology, applied in physical/chemical process catalysts, hydrogen production, chemical instruments and methods, etc., can solve the problems of non-recycling of hydrogen, high energy consumption, and difficult maintenance of high-temperature gas-phase reaction catalysts

Inactive Publication Date: 2007-06-13
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] ④In the Claus process, there are certain difficulties in the control of high temperature gas phase reaction and the maintenance of catalyst;
[0011] ⑤The reaction should be carried out at 300-400°C, and the large-scale natural gas process consumes a lot of energy
Although the ②③④⑤ problems in the Claus process do not exist in this process, it is still a hydrogen consuming process
In this way, H 2 The hydrogen in S has not been effectively recycled

Method used

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  • Photocatalyst for preparing hydrogen by visible-light photocatalytic decomposing H2S and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: the preparation process of catalyst

[0033] 11.99g titanium sulfate [Ti(SO 4 ) 2 ], 15.42g cadmium nitrate [Cd(NO 3 ) 2 4H 2 O] was dissolved in 500mL water to form solution A; 28gNaOH, 36gNa 2 S·9H 2 O dissolves in water to form solution B. Add A to B under constant stirring, and after stirring for 10 hours, 830 mL of water was filtered off, and the remaining slurry was transferred to a 200 mL polytetrafluoroethylene-lined autoclave for hydrothermal treatment at 200°C for 12 hours. After filtration, washing and vacuum drying, 10.5 g of orange-red precipitate was obtained. By changing the ratio of Ti and Cd, photocatalysts with different compositions can be prepared in the same way.

Embodiment 2

[0035] In 120mL 0.83mol·dm -3 S 2- Add 12.6g of anhydrous Na to the solution 2 SO 3 , 0.3g photocatalyst, 2.74mL PdCl 2 solution (each mL solution contains 0.767mg of Pd), 2.4mL H 2 PtCl 6 solution (1.26 mg of Pt per mL of solution), and then diluted to 200 mL. With a 300W Xe lamp as a light source, the solution is irradiated with visible light of λ>420nm, and the amount of hydrogen gas is detected by gas chromatography. Table 1 lists the hydrogen production rates of photocatalysts with different CdS contents.

[0036] Table 1. Hydrogen production rate of photocatalysts with different CdS contents

Embodiment 3

[0038] The catalyst preparation and photoreaction process are as in Example 1 and Example 2, and the hydrogen production rates with different loadings of PdS and Pt are shown in Table 2.

[0039] Table 2. Hydrogen production rate of different loadings of PdS and Pt

[0040] PdS content (wt%)

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Abstract

The present invention relates to a photocatalyst capable of utilizing visible light photocatalysis to decompose H2S for preparing hydrogen gas and its preparation method. Said photocatalyst is prepared by utilizing coprecipitation-hydrothermal method, and its composition is (H2Ti4O9)x (CdS)y (in which 4x+y=1; x is greater than or equal to O or is less than or equal to 1 and y is greater than or equal to O or is less than or equal to 1). Said photocatalyst can greatly raise hydrogen preparation efficiency.

Description

technical field [0001] The present invention relates to a method for decomposing H 2 S is a photocatalyst for producing hydrogen, specifically related to a photocatalytic decomposition of hydrogen produced in oil and natural gas mining or processing and other chemical processing and production processes using visible light 2 S is a photocatalyst for producing hydrogen. [0002] The present invention also relates to a preparation method of the above-mentioned photocatalyst. Background technique [0003] h 2 S is a harmful gas produced during oil and gas extraction or processing and other chemical processing and production processes. Currently, H 2 S is mainly treated according to the Claus process to recover sulfur. Its basic principle is: [0004] 2H 2 S+3O 2 →2H 2 O+2SO 2 [0005] 4H 2 S+2SO 2 →4H 2 O+6S [0006] Although the Claus process is a relatively mature traditional process, there are still many problems: [0007] ① In the Claus process, hydrogen is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04C01B3/04C01B17/04
CPCY02E60/364Y02E60/36
Inventor 李灿鄢洪建马贵军栾国有雷志斌
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI