In<2>O<3>/Li<0.5>La<0.5>TiO<3> hydrogen sulfide gas sensitive composite material and preparation method and application thereof

A composite material and hydrogen sulfide gas technology, applied in the field of H2S gas sensitive materials, can solve the problems of poor selectivity, high working temperature, long response and recovery time, etc., and achieve the improvement of catalytic activity, lower working temperature, and shortened response and recovery time Effect

Active Publication Date: 2019-12-10
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, a single metal oxide semiconductor generally has the disadvantages of relatively high operating temperature, long response and recovery time, and poor selectivity; and the perovskite material YMnO reported in the literature in recent years 3 Although the response and recovery time is shortened, only 5-6 seconds, but its sensitivity is only 0.49

Method used

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  • In&lt;2&gt;O&lt;3&gt;/Li&lt;0.5&gt;La&lt;0.5&gt;TiO&lt;3&gt; hydrogen sulfide gas sensitive composite material and preparation method and application thereof
  • In&lt;2&gt;O&lt;3&gt;/Li&lt;0.5&gt;La&lt;0.5&gt;TiO&lt;3&gt; hydrogen sulfide gas sensitive composite material and preparation method and application thereof
  • In&lt;2&gt;O&lt;3&gt;/Li&lt;0.5&gt;La&lt;0.5&gt;TiO&lt;3&gt; hydrogen sulfide gas sensitive composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A kind of In 2 o 3 / Li 0.5 La 0.5 TiO 3 (LLTO) the preparation method of hydrogen sulfide gas sensitive composite material, comprises the steps:

[0037] (1) In 50ml of ethanol, add 0.005mol lanthanum nitrate (La(NO 3 ) 3 ·6H 2 O), 0.03mol citric acid monohydrate, 0.0055mol lithium nitrate (LiNO 3 ), after stirring and dissolving, slowly add 0.01mol tetrabutyl titanate, 0.06mol ethylene glycol, stir and mix for 30min, set aside;

[0038] (2) 0.6mmol of indium nitrate (In(NO 3 ) 3 .4.5H 2 O) join in the mixed solution of step (1), stir 40min to dissolve completely, obtain uniform solvothermal precursor solution;

[0039] (3) Transfer the mixed solution of step (2) into a 100 milliliter polytetrafluoroethylene-lined non-magnetic steel reaction kettle, put it into a blast drying oven at 150° C. for solvothermal reaction for 6 hours;

[0040] (4) After the reaction in step (3), the reaction kettle was cooled naturally, and then centrifuged and washed three times...

Embodiment 2

[0042] A kind of In 2 o 3 / Li 0.5 La 0.5 TiO 3 (LLTO) the preparation method of hydrogen sulfide gas sensitive composite material, comprises the steps:

[0043] (1) In 60ml of ethanol, add 0.006mol lanthanum nitrate (La(NO 3 ) 3 ·6H 2 O), 0.036mol citric acid monohydrate, 0.0065mol lithium nitrate (LiNO 3 ), after stirring and dissolving, slowly add 0.012mol tetrabutyl titanate, 0.72mol ethylene glycol, stir and mix for 40min, set aside;

[0044] (2) 0.73mmol of indium nitrate (In(NO 3 ) 3 .4.5H 2 O) join in the mixed solution of step (1), stir 40min to dissolve completely, obtain uniform solvothermal precursor solution;

[0045] (3) Transfer the mixed solution of step (2) into a non-magnetic steel reaction kettle lined with 100 milliliters of polytetrafluoroethylene, and put it into a blast drying oven at 160° C. for solvothermal reaction for 6 hours;

[0046] (4) After the reaction in step (3), the reaction kettle was cooled naturally, and then centrifuged and wa...

Embodiment 3

[0048] A kind of In 2 o 3 / Li 0.5 La 0.5 TiO 3 (LLTO) the preparation method of hydrogen sulfide gas sensitive composite material, comprises the steps:

[0049] (1) In 60ml of ethanol, add 0.008mol lanthanum nitrate (La(NO 3 ) 3 ·6H 2 O), 0.035mol citric acid monohydrate, 0.0085mol lithium nitrate (LiNO 3 ), after stirring and dissolving, slowly add 0.016mol tetrabutyl titanate, 0.07mol ethylene glycol, stir and mix for 30min, set aside;

[0050] (2) 0.8mmol of indium nitrate (In(NO 3 ) 3 .4.5H 2 O) join in the mixed solution of step (1), stir 40min to dissolve completely, obtain uniform solvothermal precursor solution;

[0051] (3) Transfer the mixed solution of step (2) into a non-magnetic steel reaction kettle lined with 100 milliliters of polytetrafluoroethylene, and put it into a blast drying oven at 170° C. for solvothermal reaction for 7 hours;

[0052] (4) After the reaction in step (3), the reaction kettle was cooled naturally, and then centrifuged and was...

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Abstract

The invention discloses a preparation method of an In<2>O<3> / Li<0.5>La<0.5>TiO<3> hydrogen sulfide gas sensitive composite material. The preparation method comprises the following steps: (1) lanthanumnitrate, citric acid, lithium nitrate, tetrabutyl titanate and ethylene glycol are sequentially added into a certain amount of ethanol, and evenly stirred and mixed for standby application; (2) a certain amount of indium nitrate is added into mixed liquid in the step (1), and stirred till being completely dissolved, and a mixed solution is obtained; (3) the mixed solution in the step (2) is transferred into a reaction kettle for a solvent thermal reaction; and (4) after the reaction in the step (3) is completed, natural cooling is conducted, then centrifuging is conducted, an obtained productis dried and annealed, and then the In<2>O<3> / Li<0.5>La<0.5>TiO<3> hydrogen sulfide gas sensitive composite material is obtained. Compared with hydrogen sulfide gas sensors reported in most of literature, as for the prepared In<2>O<3> / Li<0.5>La<0.5>TiO<3> hydrogen sulfide gas sensitive composite material, the response and recovery time is shortened, hydrogen sulfide gas can be quickly detected, and detected hydrogen sulfide is wide in range.

Description

technical field [0001] The invention belongs to H 2 S gas sensitive material technical field, particularly, relate to a kind of In 2 o 3 / Li 0.5 La 0.5 TiO 3 (LLTO) hydrogen sulfide gas sensing composite material and its preparation method and application. Background technique [0002] Hydrogen sulfide gas is a poisonous gas with a pungent smell. Very low concentrations of hydrogen sulfide gas can damage the human respiratory system and nervous system. On the one hand, hydrogen sulfide gas can exist in swamps, sewers, toilets, and human bodies through bacterial decomposition of organic matter; on the other hand, hydrogen sulfide gas is also widely present in oil, natural gas, and coal mines. It will cause damage to equipment and bring life threats of explosion and poisoning to mining personnel. Therefore, the detection of hydrogen sulfide gas is urgent. [0003] Gas sensor technology plays an important role in the future development, and there is an increasing trend ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G15/00C01G23/00G01N27/12
CPCC01G15/00C01G23/003G01N27/127G01N27/12C01P2002/72C01P2004/03C01P2004/80
Inventor 范佳杰刘自豪马梦君张先乐孙龙范向伟张忠新高彩琴
Owner ZHENGZHOU UNIV
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