CN101898149A - Supported nanometer metallic sliver catalyst with dual functions of adsorption and low-temperature catalysis, and preparation method and application thereof - Google Patents
Supported nanometer metallic sliver catalyst with dual functions of adsorption and low-temperature catalysis, and preparation method and application thereof Download PDFInfo
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- CN101898149A CN101898149A CN 201010241373 CN201010241373A CN101898149A CN 101898149 A CN101898149 A CN 101898149A CN 201010241373 CN201010241373 CN 201010241373 CN 201010241373 A CN201010241373 A CN 201010241373A CN 101898149 A CN101898149 A CN 101898149A
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Abstract
The invention relates to a supported nanometer metallic sliver catalyst with dual functions of adsorption and low-temperature catalysis, and a preparation method and application thereof. The supported nanometer metallic sliver catalyst is prepared by a simple and practicable isopyknic immersion method, wherein a nanometer material with high specific surface area is used as a carrier. The catalyst is characterized in that: a large amount of formaldehyde can be adsorbed effectively at room temperature, and the adsorbed pollutants can be converted into harmless CO2 and H2O by low-temperature catalytic oxidation technology without other by-products and secondary pollution, so the catalyst is efficient and energy-saving; and simultaneously, the catalyst has low cost, and the catalytic activity is higher than that of catalysts of manganese oxides, cobalt oxides or rare-earth composite oxides. Compared with noble metal catalysts such as platinum, rhodium, palladium and the like, the supported nanometer metallic sliver catalyst has the advantages of low cost and relatively abundant resources, and the preparation method of the catalyst has the advantages of simplicity and low cost, so the catalyst has excellent application value and application prospect.
Description
Technical field
The invention belongs to the air contaminant treatment technical field, relate to a kind of method for preparing catalyst, specially refer to a kind of the have bifunctional supported nanometer metallic sliver catalyst of absorption-low temperature catalysis, preparation method and application thereof.
Background technology
Formaldehyde is as a kind of highly toxic material, and short term contact can stimulate eyes, nasal cavity and respiratory tract and cause allergic reaction, and long-term contact can increase the possibility of suffering from cancer, and for this reason, formaldehyde is defined as carcinogenic and teratogenesis shape material by the World Health Organization.China interior decoration association report China has reached 11.1 ten thousand by the death toll that room air pollution causes every year, and that is to say less than five minutes just has a life to disappear.China's promulgation " IAQ standard " (GB/T18883-2002) stipulates that formaldehyde in indoor air sanitary standard (maximum permissible concentration) is 0.08mg/m for this reason
3, be about 0.06ppm under the room temperature.
The existing technology of eliminating toxic gas mostly is absorption method (CNPatent:1405560,2003; 1386578,2002; USPatent:6596909,2003; JPPatent:2004089963-A, 2004; 2004097374-A, 2004), use strong sorptive material absorption atmosphere pollution.Porous carbon materials commonly used, novel active carbon and molecular sieve, zeolite, adobe ore, activated alumina and silica gel etc. are as adsorbent.This kind method is fairly simple, but adsorbent needs periodic replacement.Though the plasma-catalytic technology is moved at normal temperatures and pressures, can produce harmful side products such as ozone, nitrogen oxide, and the apparatus expensive of plasma.And photocatalysis technology (CN-Patent:1394674,2003) need utilize the higher ultraviolet light of energy usually, and natural daylight medium ultraviolet light component is lower, adopts not only cost height of ultraviolet illumination, and the general room environment is also lacked feasibility; Therefore, need the simple and easy to do new technique of under temperate condition, eliminating pernicious gas of exploitation badly and effectively protect health.
Summary of the invention
The present invention utilizes catalytic oxidation formaldehyde can be decomposed into the characteristic of nontoxic carbon dioxide and water under certain condition, and a kind of the have bifunctional supported nanometer metallic sliver catalyst of absorption-low temperature catalysis, preparation method and application thereof are provided.
Technical scheme of the present invention is as follows:
The carrier of nanometer metallic silver loaded catalyst of the present invention can be MCM-41, SBA-15, NaY, SiO
2, Al
2O
3, TiO
2Etc. at least a in the nano material, active component is a nanometer metallic silver.
Above-mentioned nanometer metallic silver loaded catalyst is made by equi-volume impregnating, and concrete steps are as follows:
(1) isopyknic water adsorption volume of measurement different carriers.Described carrier can be a nano material, and nano material can be MCM-41, SBA-15, NaY, SiO
2, Al
2O
3, TiO
2In at least a.
(2) taking by weighing corresponding silver nitrate according to content of metal is dissolved in the water of carrier specific water absorption.Fully stir, fully dissolving.The argent load capacity of described supported nanometer metallic sliver catalyst, metallic element percentage by weight are 1-16%.
(3) required carrier amount stirred, be dissolved in above-mentioned (2) and obtain in the stoste, leave standstill to continue to stir behind the 10-30min and obtain sample.
(4) sample that above-mentioned (3) are obtained is placed on drying under the room temperature, spends the night.
(5) sample that above-mentioned (4) are obtained is placed in the baking oven and keeps 12-24h in 60-100 ℃.
(6) sample that above-mentioned (5) are obtained is placed on 500-800 ℃ of calcining down, can carry out at Muffle furnace, keeps 2-5h.
The preparation of above-mentioned nanometer metallic silver loaded catalyst is carried out under the condition of lucifuge.
Aforesaid catalyst can be made various structures, shape according to different needs, as making catalyst spherical or tabular use or the like.
The catalyst that the nano material that utilization of the present invention is selected for use makes, its Stability Analysis of Structures, unique characteristics such as pore structure, at normal temperatures can be as a kind of effective formaldehyde adsorbent material, reach the elimination of PARA FORMALDEHYDE PRILLS(91,95) under the normal temperature condition, utilize supported nanometer metallic sliver catalyst (30-100 ℃) condition by catalytic combustion under proper temperature that formaldehyde is converted into harmless carbon dioxide and water simultaneously.
The invention has the beneficial effects as follows that employing catalyst raw material of the present invention is cheap and easy to get, the preparation method is simple, and can effectively remove airborne organic volatile contact scar thing-formaldehyde.Catalyst of the present invention can effectively adsorb a large amount of formaldehyde at ambient temperature, and adsorbed contaminants can be converted into harmless CO by the low-temperature catalytic oxidation technology
2And H
2O does not have other accessory substances, non-secondary pollution.The catalyst serviceability temperature is 30-100 ℃, is energy-conservation catalyst.Its catalytic activity of this catalyst is higher than the catalyst of manganese, cobalt/cobalt oxide or complex rare-earth oxidate containing valuable metal simultaneously.Compare with noble metal catalysts such as platinum, rhodium, palladiums that its price is low, resource is relative abundant, and the production method of this catalyst is simple, cost is low, therefore feasible degree height.
Description of drawings
Accompanying drawing is the temperature programmed desorption curve comparison diagram of different nanometer metallic silver loaded catalyst PARA FORMALDEHYDE PRILLS(91,95)s.
Among the figure: abscissa be temperature (℃), ordinate is a formaldehyde desorption concentration relative intensity;
1MCM-41；2SBA-15；3Al
2O
3；4SiO
2；5TiO
2；6NaY。
The specific embodiment
Be described in detail specific embodiments of the invention below in conjunction with technical scheme and description of drawings.
Embodiment 1
The preparation of high-specific area nano material MCM-41 carried metal silver: the 0.0158g silver nitrate is added in the 4.5ml deionized water, and stirring is fully dissolved it.1gMCM-41 joins in the above-mentioned liquor argenti nitratis ophthalmicus while stirring, continues to stir.Stop continuing to stir behind the 10min.12h is handled in 60 ℃ of oven dry after the sample room temperature dried overnight, obtains the 1wt.%Ag/MCM-41 sample.With the oven dry after catalyst sieve into 20-40 order size particles standby.
The activity of such catalysts evaluation is carried out in straight pipe type fixed bed continuous-flow differential reactor, and reactor is the straight crystal reaction tube of internal diameter 8mm, and loaded catalyst is 200-500mg, and formaldehyde gas is produced by the formaldehyde gas generator.Gas volume is formed: oxygen: 10-20%, and argon gas: 80-90%, formaldehyde control concentration is 100-500ppm, reaction velocity is 20000-50000/h.This catalyst can be complete with interior absorption at 2 hours more than 500 times for being higher than the GB/T18883-2002 concentration of formaldehyde, and the formaldehyde in the reaction 20min afterproduct gas is through being furnished with the GC-7890II gas chromatograph on-line analysis of fid detector.Be about more than 90% at formaldehyde conversion ratio below 100 ℃.Concentration meets national standard after purifying.
According to the preparation method of the present invention of embodiment 1, can use SBA-15, NaY, SiO for high-specific area nano material MCM-41 carrier
2, Al
2O
3, TiO
2Replace, obtain containing the sample of 1wt.% silver.
For being higher than the concentration of formaldehyde of GB/T18883-2002 standard more than 500 times, this catalyst is can at room temperature 2 hours complete with interior absorption.Formaldehyde in the reaction 20min afterproduct gas is through being furnished with the GC-7890II gas chromatograph on-line analysis of fid detector.Be about more than 80% at formaldehyde conversion ratio below 100 ℃.Concentration meets national standard after purifying.
According to the preparation method of the present invention of embodiment 1, the preparation of supported nanometer metallic sliver catalyst also can add the 0.0158g silver nitrate in the 4.5ml deionized water, stirs it is fully dissolved.1g carrier such as MCM-41 join in the above-mentioned liquor argenti nitratis ophthalmicus while stirring, stop continuing to stir behind the 30min.24h is handled in 100 ℃ of oven dry after the sample room temperature dried overnight, obtains the 1wt.%Ag/MCM-41 sample.With the oven dry after catalyst sieve into 20-40 order size particles standby.
The activity of such catalysts evaluation is carried out in straight pipe type fixed bed continuous-flow differential reactor, and reactor is the straight crystal reaction tube of internal diameter 8mm, and loaded catalyst is 200mg, and formaldehyde gas is produced by the formaldehyde gas generator.Gas volume is formed: oxygen: 10-20%, and argon gas: 80-90%, formaldehyde control concentration is 100-500ppm, reaction velocity is 20000-50000/h.This catalyst can be complete with interior absorption at 2 hours more than 500 times for being higher than the GB/T18883-2002 concentration of formaldehyde, and the formaldehyde in the reaction 20min afterproduct gas is through being furnished with the GC-7890II gas chromatograph on-line analysis of fid detector.Be about more than 85% at formaldehyde conversion ratio below 100 ℃.Concentration meets national standard after purifying.
The hole structural property figure of table 1 different carriers
Claims (4)
1. one kind has the bifunctional supported nanometer metallic sliver catalyst of absorption-low temperature catalysis, it is characterized in that, the carrier of nanometer metallic silver loaded catalyst is MCM-41, SBA-15, NaY, SiO
2, A1
2O
3, TiO
2In at least a, active component is a nanometer metallic silver;
2. the described supported nanometer metallic sliver catalyst preparation method of claim 1 is characterized in that following steps,
(1) isopyknic water adsorption volume of measurement different carriers;
(2) taking by weighing corresponding silver nitrate according to content of metal is dissolved in the water of carrier specific water absorption; Fully stir, fully dissolving; The argent load capacity of described supported nanometer metallic sliver catalyst, metallic element percentage by weight are 1-16%;
(3) required carrier amount stirred, be dissolved in above-mentioned (2) and obtain in the stoste, leave standstill to continue to stir behind the 10-30min and obtain sample;
(4) sample that above-mentioned (3) are obtained is placed on drying under the room temperature, spends the night;
(5) sample that above-mentioned (4) are obtained is placed in the baking oven and keeps 12-24h in 60-100 ℃;
(6) sample that above-mentioned (5) are obtained is placed on 500-800 ℃ of calcining down, keeps 2-5h;
The preparation of above-mentioned nanometer metallic silver loaded catalyst is carried out under the condition of lucifuge.
3. according to the application of the described supported nanometer metallic sliver catalyst of claim 1, it is characterized in that described catalyst at normal temperatures can be as a kind of effective formaldehyde adsorbent material.
4. according to the application of the described supported nanometer metallic sliver catalyst of claim 1, it is characterized in that described catalyst can be harmless carbon dioxide and water with formaldehyde through catalytic oxidation down at 30-100 ℃.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103691311A (en) * | 2013-12-03 | 2014-04-02 | 大连理工大学 | Catalyzation method for simultaneously removing aldehydes and benzene-series pollutants at room temperature |
| CN103962174A (en) * | 2014-05-20 | 2014-08-06 | 大连理工大学 | AgCo bimetallic catalyst with adsorption-catalysis double functions for use in removal of formaldehyde and preparation method thereof |
| CN105665021A (en) * | 2016-01-11 | 2016-06-15 | 吉林省东成环保集团有限公司 | Formaldehyde degradation catalyst |
| CN105879611A (en) * | 2016-05-09 | 2016-08-24 | 西安天宇环保科技有限公司 | Method for preparing formaldehyde scavenging agent by adopting nanotechnology |
| CN108686699A (en) * | 2018-04-18 | 2018-10-23 | 中山市洁鼎过滤制品有限公司 | A kind of anti-biotic material and preparation method thereof of room temperature formaldehyde adsorption |
| CN111468172A (en) * | 2020-05-12 | 2020-07-31 | 大连理工大学 | Metal oxide-silver bifunctional catalyst for formaldehyde waste gas purification treatment and preparation method thereof |
| CN112808301A (en) * | 2021-01-04 | 2021-05-18 | 大连理工大学 | Composite catalyst and method for catalyzing formaldehyde to be completely oxidized and eliminated by composite catalyst |
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| CN1428293A (en) * | 2001-12-25 | 2003-07-09 | 中国科学院大连化学物理研究所 | Catalyst for low-temp. selective oxidation of CO in hydrogen gas and its preparation method |
| US6596909B2 (en) * | 2000-01-31 | 2003-07-22 | Mazda Motor Corporation | Adsorption of aldehyde with adsorbent containing zeolite |
| CN1795970A (en) * | 2004-12-28 | 2006-07-05 | 中国科学院生态环境研究中心 | High performance catalyst for catalyzing formaldehyde to complete oxidation under room temperature temperature |
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2010
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Patent Citations (3)
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| US6596909B2 (en) * | 2000-01-31 | 2003-07-22 | Mazda Motor Corporation | Adsorption of aldehyde with adsorbent containing zeolite |
| CN1428293A (en) * | 2001-12-25 | 2003-07-09 | 中国科学院大连化学物理研究所 | Catalyst for low-temp. selective oxidation of CO in hydrogen gas and its preparation method |
| CN1795970A (en) * | 2004-12-28 | 2006-07-05 | 中国科学院生态环境研究中心 | High performance catalyst for catalyzing formaldehyde to complete oxidation under room temperature temperature |
Non-Patent Citations (1)
| Title |
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| 《中国科技论文在线》 20090531 闻梦等 "Ag/SiO2催化剂对CO低温催化氧化活性" 第368页1.1，第369页第1段，第371页第5段 1-3 第4卷, 第5期 2 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103691311A (en) * | 2013-12-03 | 2014-04-02 | 大连理工大学 | Catalyzation method for simultaneously removing aldehydes and benzene-series pollutants at room temperature |
| CN103962174A (en) * | 2014-05-20 | 2014-08-06 | 大连理工大学 | AgCo bimetallic catalyst with adsorption-catalysis double functions for use in removal of formaldehyde and preparation method thereof |
| CN105665021A (en) * | 2016-01-11 | 2016-06-15 | 吉林省东成环保集团有限公司 | Formaldehyde degradation catalyst |
| CN105879611A (en) * | 2016-05-09 | 2016-08-24 | 西安天宇环保科技有限公司 | Method for preparing formaldehyde scavenging agent by adopting nanotechnology |
| CN105879611B (en) * | 2016-05-09 | 2019-11-08 | 西安天宇环保科技有限公司 | The preparation method of nanotechnology formaldehyde scavenger |
| CN108686699A (en) * | 2018-04-18 | 2018-10-23 | 中山市洁鼎过滤制品有限公司 | A kind of anti-biotic material and preparation method thereof of room temperature formaldehyde adsorption |
| CN111468172A (en) * | 2020-05-12 | 2020-07-31 | 大连理工大学 | Metal oxide-silver bifunctional catalyst for formaldehyde waste gas purification treatment and preparation method thereof |
| CN111468172B (en) * | 2020-05-12 | 2023-03-14 | 大连理工大学 | Metal oxide-silver bifunctional catalyst for formaldehyde waste gas purification treatment and preparation method thereof |
| CN112808301A (en) * | 2021-01-04 | 2021-05-18 | 大连理工大学 | Composite catalyst and method for catalyzing formaldehyde to be completely oxidized and eliminated by composite catalyst |
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Open date: 20101201 |