CN105289605A - Au-Pt MnO2/ZnO/TiO2 catalyst - Google Patents

Au-Pt MnO2/ZnO/TiO2 catalyst Download PDF

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CN105289605A
CN105289605A CN201410247428.6A CN201410247428A CN105289605A CN 105289605 A CN105289605 A CN 105289605A CN 201410247428 A CN201410247428 A CN 201410247428A CN 105289605 A CN105289605 A CN 105289605A
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zno
tio
catalyst
mno
ptmno
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邵建军
焦安龙
鞠晓春
李家波
周学滨
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/20—Capture or disposal of greenhouse gases of methane

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Abstract

The present invention provides an Au-Pt MnO2/ZnO/TiO2 catalyst with a catalytic oxidation function. The Au-Pt MnO2/ZnO/TiO2 catalyst is characterized in that mass percentage of Au and Pt in the catalyst is respectively 2% and 1% of MnO2/ZnO/TiO2, and an atomic ratio of Zn, Mn and Ti in the MnO2/ZnO/TiO2 composite oxide is 12/1/1. The Au-Pt MnO2/ZnO/TiO2 catalyst can further improve the carbon oxide and formaldehyde oxidation activity in a catalyst low-temperature environment.

Description

A kind of Au-PtMnO 2/ ZnO/TiO 2catalyst
Technical field
The present invention relates to a kind of Au-PtMnO 2/ ZnO/TiO 2the technology of preparing of catalyst, and the catalytic applications of this oxide in carbon monoxide and the oxidation of formaldehyde low temperature environment.
Background technology
CO low temperature oxidation is widely used in environment pollution control, breathing mask and the removal to trace carbon monoxide in the enclosed environment such as spaceship, submarine.In numerous catalyst system, the Au catalyst supported on appropriate oxidation thing presents good CO low temperature oxidation activity [J.Mol.Catal.A200 (2003) 229, J.Catal.216 (2003) 425].Research shows, different sintering temperatures, Pretreatment atmosphere will directly affect the physical and chemical performance such as particle diameter, valence state of golden species, thus on the active impact [Appl.Catal.A226 (2002) 1.] also had in various degree of Oxidation of Carbon Monoxide.In the oxide carrier of golden load, about on ZnO carrier, the research of supported gold species is seldom reported.Wang etc. have studied precipitating reagent and the sintering temperature Au/ZnO catalyst on preparation under normal temperature moist conditions to the impact [Appl.Catal.A239 (2003) 1] of Oxidation of Carbon Monoxide performance.Au particle size and chemical state thereof are the key factor [J.Catal.144 (1993) 175 of the redox property affecting catalyst, J.Catal.240 (2006) 222], the catalytic performance of the Au catalyst that Wolf etc. [Appl.Catal.A.226 (2002) 1-13] system research different carriers supports, show that the oxidation activity of Au catalyst is not only relevant with the particle diameter of golden species, also affect by the strong interaction of gold with support oxide.Kolov etc. report and adopt the compound of phosphatization gold and settled metal hydroxides to make presoma, the precipitation of Au compound and the phase transformation of carrier are carried out simultaneously, can make, between Au and carrier, more effective interaction occurs, and then define the Au catalyst [Appl.Catal.A.182 (1999) 9-28, J.Catal.181 (1999) 37-48] simultaneously with high activity and high stability.Auxiliary agent add the golden species [J.Phys.Chem.B109 (2005) 9678-9683] being of value to and obtaining more small particle diameter.
Within 1972, Japanese Fujishima and Honda is at n-type semiconductor TiO 2after upper discovery Single Crystalline Electrodes light decomposition water, photocatalysis oxidation method causes the great attention of numerous scientific research personnel, and in curbing environmental pollution, progressively obtain effective application [Powd.Tech.217 (2012) 585 – 590, Appl.Catal.B144 (2014) 498 – 506, J.Photochem.Photobio.A271 (2013) 45 – 55].Wolf etc. [Aplli.Catal.A226 (2002) 1-13] to the catalytic activity of several carrier relatively in, be carried on TiO 2on Au catalyst higher to catalyzing carbon monoxide oxidation activity, think in load type gold catalyst, not only TiO2 is of value to as carrier and obtains high dispersive, golden species compared with granule crystalline substance, and carrier is same with the conspiracy relation of golden species plays catalytic action.Zinc titanium presents good Oxidation of Carbon Monoxide activity [Int.j.Hydr.Energy.37 (2012) 15140-15155] due to carrier as the Au catalyst of carrier also has considerable influence to load gold catalyst activity, and the low-temperature oxidation of golden zinc titanium catalyst to carbon monoxide of research optimum proportioning is still a challenging problem.Formaldehyde is the gas that toxicity is higher, and research shows that short term contact formaldehyde can stimulate eyes, nasal cavity and respiratory tract to cause allergic reaction, and Long Term Contact then can increase the possibility suffering from cancer.At present absorption method is mainly to the administering method of formaldehyde in indoor air.There is the saturated shortcoming of absorption in this method.The formaldehyde that catalytic oxidation is removed in room air is a kind of long-acting method, and it can utilize the oxygen in air that formaldehyde is completely oxidized to carbon dioxide and water, and catalyst can Long-Time Service.After deliberation, in the catalytic performance of a series of catalyst of transition metal oxide PARA FORMALDEHYDE PRILLS(91,95) complete oxidation, MnO 2be good catalyst, at room temperature just can release carbon dioxide with formolite reaction, but conversion ratio be not high.
Summary of the invention
The object of the present invention is to provide a kind of Au-PtMnO 2/ ZnO/TiO 2the Quick Oxidation to carbon monoxide, formaldehyde is realized under the preparation method of catalyst and this catalyst low-temp reaction condition.
A kind of Au-PtMnO 2/ ZnO/TiO 2catalyst, is characterized in that: in catalyst, the mass percentage of Au, Pt is respectively MnO2/ZnO/TiO 22% and 1%, MnO2/ZnO/TiO 2in composite oxides, the atomic ratio of Zn and Mn, Ti is 12/1/1.Described Au-PtMnO2/ZnO/TiO 2catalyst, can further improve the carbon monoxide under catalyst low temperature environment and oxidation of formaldehyde activity.
Au-PtMnO of the present invention 2/ ZnO/TiO 2its MnO used of catalyst 2/ ZnO/TiO 2its preparation method of composite oxides, is characterized in that: adopting the precipitation method to prepare zinc with the atomic ratio of manganese, titanium is the MnO of 12 to 1 to 1 2/ ZnO/TiO 2composite oxide catalysts.Under agitation, by the Zn (NO of 1mol/L 3) 26H 2mn (the NO of O, 1mol/L 3) 26H 2ti (the SO of O and 1mol/L 4) 2the aqueous solution slowly instills in the boiling urea liquid of debita spissitudo in proportion, aging, diafiltration, drying, roasting.
Au-PtMnO provided by the present invention 2/ ZnO/TiO 2the preparation method of catalyst, is characterized in that: down payment, platinum load capacity are respectively MnO 2/ ZnO/TiO 2the rate of charge of composite oxides quality 2% and 1% measures HAuCl 44H 2o and H 2ptCl 66H 2o solution is also adjusted to debita spissitudo.With the Na of 0.1mol/L 2cO 3solution is respectively by HAuCl 44H 2o, H 2ptCl 66H 2o solution and MnO 2/ ZnO/TiO 2composite oxides suspension regulates pH to appropriate value, then at the temperature and high-speed stirred of 343K, by HAuCl 44H 2o, H 2ptCl 66H 2o solution slowly instills MnO 2/ ZnO/TiO 2in composite oxides suspension, aging 4 is dry.
Au-PtMnO of the present invention 2/ ZnO/TiO 2catalyst agent can be used for carbon monoxide, formaldehyde low-temperature oxidation, it is characterized in that: carry out in the miniature fixed bed quartz tube reactor of normal pressure, low-temp reaction immerses in liquid nitrogen container by U-shaped reactor, controls reaction temperature by regulating the distance of catalyst and liquid nitrogen liquid level.Reactor outlet gas HP-6890 type gas chromatograph on-line analysis, and nickel converter is installed before fid detector, respectively by CO and CO in hydrogen atmosphere 2be converted into CH quantitatively 4.
Accompanying drawing explanation
Fig. 1 is catalyst conversion ratio variation diagram (GHSV=24000ml/gh) to CO oxidation reaction under condition of different temperatures.
Fig. 2 is formaldehyde complete oxidation stability test (298K, GHSV=12000ml/gh) under catalyst room temperature condition.
Detailed description of the invention
Below in conjunction with drawings and the embodiments, the present invention is further detailed explanation.
Embodiment 1
Zinc is the MnO of 12 to 1 to 1 with the atomic ratio of manganese, titanium 2/ ZnO/TiO 2the preparation of composite oxides.Adopting the precipitation method to prepare zinc with the atomic ratio of manganese, titanium is the MnO of 12 to 1 to 1 2/ ZnO/TiO 2composite oxide catalysts.Under agitation, by the Zn (NO of 1mol/L 3) 26H 2mn (the NO of O, 1mol/L 3) 26H 2ti (the SO of O and 1mol/L 4) 2the aqueous solution slowly instills in the boiling urea liquid of debita spissitudo in proportion, aging, diafiltration, drying, roasting.
Embodiment 2
Au-PtMnO 2/ ZnO/TiO 2the preparation of catalyst.The MnO of choosing preparation 2/ ZnO/TiO 2composite oxides are carrier, and down payment, platinum load capacity are respectively MnO 2/ ZnO/TiO 2the rate of charge of composite oxides quality 2% and 1% measures HAuCl 44H 2o and H 2ptCl 66H 2o solution is also adjusted to debita spissitudo.With the Na of 0.1mol/L 2cO 3solution is respectively by HAuCl 44H 2o, H 2ptCl 66H 2o solution and MnO 2/ ZnO/TiO 2composite oxides suspension regulates pH to appropriate value, then at the temperature and high-speed stirred of 343K, by HAuCl 44H 2o, H 2ptCl 66H 2o solution slowly instills MnO 2/ ZnO/TiO 2in composite oxides suspension, aging 4 is dry.
Embodiment 3
Au-PtMnO 2/ ZnO/TiO 2the test of catalyst oxidation reactivity worth.The active testing of catalyst carries out in the miniature fixed bed quartz tube reactor of normal pressure.By catalyst fines compression molding, and fragmentation is screened to 40-60 order, and 200mg is contained in the crystal reaction tube of Ф=6mm.Low-temp reaction immerses in liquid nitrogen container by U-shaped reactor, controls reaction temperature by regulating the distance of catalyst and liquid nitrogen liquid level.Reactor outlet gas HP-6890 type gas chromatograph on-line analysis, and nickel converter is installed before fid detector, respectively by CO and CO in hydrogen atmosphere 2be converted into CH quantitatively 4.

Claims (4)

1. an Au-PtMnO 2/ ZnO/TiO 2catalyst, has catalytic oxidation function, it is characterized in that: in catalyst, the mass percentage of Au, Pt is respectively MnO 2/ ZnO/TiO 22% and 1%, MnO 2/ ZnO/TiO 2in composite oxides, the atomic ratio of Zn and Mn, Ti is 12/1/1; Described Au-PtMnO 2/ ZnO/TiO 2catalyst, can further improve the carbon monoxide under catalyst low temperature environment and oxidation of formaldehyde activity.
2. an Au-PtMnO according to claim 1 2/ ZnO/TiO 2catalyst, its MnO used 2/ ZnO/TiO 2its preparation method of composite oxides, is characterised in that: adopting the precipitation method to prepare zinc with the atomic ratio of manganese, titanium is the MnO of 12 to 1 to 1 2/ ZnO/TiO 2composite oxide catalysts; Under agitation, by the Zn (NO of 1mol/L 3) 26H 2mn (the NO of O, 1mol/L 3) 26H 2ti (the SO of O and 1mol/L 4) 2the aqueous solution slowly instills in the boiling urea liquid of debita spissitudo in proportion, aging, diafiltration, drying, roasting.
3. an Au-PtMnO according to claim 1 2/ ZnO/TiO 2the preparation method of catalyst, is characterized in that: down payment, platinum load capacity are respectively MnO 2/ ZnO/TiO 2the rate of charge of composite oxides quality 2% and 1% measures HAuCl 44H 2o and H 2ptCl 66H 2o solution is also adjusted to debita spissitudo; With the Na of 0.1mol/L 2cO 3solution is respectively by HAuCl 44H 2o, H2PtCl 66H 2o solution and MnO 2/ ZnO/TiO 2composite oxides suspension regulates pH to appropriate value, then at the temperature and high-speed stirred of 343K, by HAuCl 44H 2o, H 2ptCl 66H 2o solution slowly instills MnO 2/ ZnO/TiO 2in composite oxides suspension, aging 4 is dry.
4. an Au-PtMnO according to claim 1 2/ ZnO/TiO 2catalyst can be used for carbon monoxide, formaldehyde low-temperature oxidation, it is characterized in that: carry out in the miniature fixed bed quartz tube reactor of normal pressure; Low-temp reaction immerses in liquid nitrogen container by U-shaped reactor, controls reaction temperature by regulating the distance of catalyst and liquid nitrogen liquid level; Reactor outlet gas HP-6890 type gas chromatograph on-line analysis, and nickel converter is installed before fid detector, respectively by CO and CO in hydrogen atmosphere 2be converted into CH quantitatively 4.
CN201410247428.6A 2014-06-06 2014-06-06 Au-Pt MnO2/ZnO/TiO2 catalyst Pending CN105289605A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101462049A (en) * 2007-12-20 2009-06-24 苏州工业园区安泽汶环保技术有限公司 High-dispersion manganese-cerium composite oxides and preparation method thereof
JP2012081458A (en) * 2010-09-14 2012-04-26 Tokyo Metropolitan Univ Catalyst composition for catalytic combustion reaction of ethylene and method for decomposing ethylene by using the same
CN103752310A (en) * 2013-11-25 2014-04-30 邵建军 Preparation and catalytic application of Au/ZnO/TiO2 catalyst

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101462049A (en) * 2007-12-20 2009-06-24 苏州工业园区安泽汶环保技术有限公司 High-dispersion manganese-cerium composite oxides and preparation method thereof
JP2012081458A (en) * 2010-09-14 2012-04-26 Tokyo Metropolitan Univ Catalyst composition for catalytic combustion reaction of ethylene and method for decomposing ethylene by using the same
CN103752310A (en) * 2013-11-25 2014-04-30 邵建军 Preparation and catalytic application of Au/ZnO/TiO2 catalyst

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
XUEHUA YU，ET AL: "Au-Pt bimetallic nanoparticles supported on nest-like MnO2: synthesis and application in HCHO decomposition", 《J NANOPART RES》 *

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