CN109985625A - A kind of load type nano gold photochemical catalyst and preparation method thereof - Google Patents
A kind of load type nano gold photochemical catalyst and preparation method thereof Download PDFInfo
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- 239000010931 gold Substances 0.000 title claims abstract description 79
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 229910052737 gold Inorganic materials 0.000 title claims abstract description 48
- 239000003054 catalyst Substances 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 33
- 229910052684 Cerium Inorganic materials 0.000 claims abstract description 23
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000004094 surface-active agent Substances 0.000 claims abstract description 18
- 229910010413 TiO 2 Inorganic materials 0.000 claims abstract description 17
- 239000000243 solution Substances 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000000470 constituent Substances 0.000 claims abstract description 14
- 239000002243 precursor Substances 0.000 claims abstract description 13
- 239000002245 particle Substances 0.000 claims abstract description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000011943 nanocatalyst Substances 0.000 claims abstract description 7
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 6
- 239000010936 titanium Substances 0.000 claims abstract description 6
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 5
- 235000004237 Crocus Nutrition 0.000 claims abstract description 5
- 241000596148 Crocus Species 0.000 claims abstract description 5
- HGWOWDFNMKCVLG-UHFFFAOYSA-N [O--].[O--].[Ti+4].[Ti+4] Chemical compound [O--].[O--].[Ti+4].[Ti+4] HGWOWDFNMKCVLG-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims abstract description 5
- 239000011259 mixed solution Substances 0.000 claims abstract description 5
- 229910000510 noble metal Inorganic materials 0.000 claims abstract description 5
- 239000005011 phenolic resin Substances 0.000 claims abstract description 5
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 5
- 239000000126 substance Substances 0.000 claims abstract description 5
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 27
- 239000002105 nanoparticle Substances 0.000 claims description 19
- 239000004408 titanium dioxide Substances 0.000 claims description 11
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 229910003803 Gold(III) chloride Inorganic materials 0.000 claims description 8
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 7
- 239000001257 hydrogen Substances 0.000 claims description 7
- 229910052739 hydrogen Inorganic materials 0.000 claims description 7
- 244000248349 Citrus limon Species 0.000 claims description 6
- 235000005979 Citrus limon Nutrition 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 229910004042 HAuCl4 Inorganic materials 0.000 claims description 4
- 229910021529 ammonia Inorganic materials 0.000 claims description 4
- 238000001354 calcination Methods 0.000 claims description 4
- 239000012153 distilled water Substances 0.000 claims description 4
- 239000008246 gaseous mixture Substances 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 238000005201 scrubbing Methods 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 239000000460 chlorine Substances 0.000 claims 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims 1
- 229910052801 chlorine Inorganic materials 0.000 claims 1
- 229910021505 gold(III) hydroxide Inorganic materials 0.000 claims 1
- 238000010025 steaming Methods 0.000 claims 1
- 238000003756 stirring Methods 0.000 abstract description 3
- 238000004090 dissolution Methods 0.000 abstract 1
- 230000003197 catalytic effect Effects 0.000 description 13
- 230000003647 oxidation Effects 0.000 description 8
- 238000007254 oxidation reaction Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 238000006555 catalytic reaction Methods 0.000 description 4
- 229910000420 cerium oxide Inorganic materials 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 3
- BSYLOTSXNQZYFW-UHFFFAOYSA-K trichlorogold;hydrate Chemical compound O.Cl[Au](Cl)Cl BSYLOTSXNQZYFW-UHFFFAOYSA-K 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 241000894007 species Species 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 229910001258 titanium gold Inorganic materials 0.000 description 2
- 229910000314 transition metal oxide Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000000975 co-precipitation Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 238000006276 transfer reaction Methods 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/66—Silver or gold
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/39—Photocatalytic properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/391—Physical properties of the active metal ingredient
- B01J35/393—Metal or metal oxide crystallite size
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/391—Physical properties of the active metal ingredient
- B01J35/394—Metal dispersion value, e.g. percentage or fraction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/06—Washing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/08—Heat treatment
- B01J37/082—Decomposition and pyrolysis
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Catalysts (AREA)
Abstract
The invention discloses a kind of load type nano gold photochemical catalysts and preparation method thereof, active constituent is noble metal gold Au, carrier be cerium oxide-doped mesoporous TiO 2, by golden Au nanometer particle load to bigger serface, the cerium oxide-doped of high-crystallinity meso-porous titanium dioxide titanium carrier on formed；The preparation method is: S1, be added to the water surfactant and citric acid stirring；Surfactant and citric acid are completely dissolved by water；S2, the precursor solution that bimetallic source (titanium source, cerium source) and active constituent gold is separately added into mixed solution, the phenolic resin ethanol solution that mass percent concentration is 15~25% is added after dissolution completely, it is sufficiently stirred to form homogeneous phase solution under 30~50 DEG C of water-baths, it pours into container, it places in an oven, then it is crosslinked in an oven, obtains the transparent membranoid substance of crocus；S3, the cooling of step (2) products therefrom is washed, then be centrifugated；Roasting, obtains the mesoporous TiO 2 nano catalyst of cerium oxide-doped.
Description
Technical field
The present invention relates to a kind of load type nano gold photochemical catalysts and preparation method thereof.
Background technique
Load type gold catalyst is that a kind of novel industry and environment protection catalytic material, CO low-temperature oxidation catalytic performance are being sealed
Enclosed CO2The closed systems such as laser, spacecraft and submarine, CO gas sensor, CO gas shield mask and hydrogen fuel
Many fields such as battery are with a wide range of applications.It is the Au catalyst of carrier in Oxidation of Carbon Monoxide, water using titanium dioxide
Vapour transfer reaction is prepared hydrogen peroxide by hydrogen and oxygen, removes the neck such as carbon monoxide and selective oxidation from hydrogen-rich system
Domain has important application.People are to the Au catalyst that high specific surface area titanic oxide is carrier and with non-porous titanium dioxide
The Au catalyst of carrier is studied respectively.
Au/Fe2O3, the oxide carried Au catalyst such as Au/NiO, there is very high activity to the oxidation of CO at room temperature
[HarutaM., YamadaN.J.Catal.1989,115:301].[the Chinese patent application publication number such as An Lidun
CN00122829] gold is supported on single oxide carrier, being prepared can be in environment temperature (- 10~40 DEG C) and environmental wet
There is good catalytic activity under (relative humidity 60%~100%) under degree and can satisfy the catalysis of breathing mask real requirement
Agent.But if gold is supported on single carrier Al2O3On, cannot generally have the nano catalyst of low temperature active, if will
Gold is supported on individual transition metal oxide, then catalyst obtained generally has during realization is industrialized suitable
Difficulty.Load type nano gold catalyst is prepared using coprecipitation in Hao Zheng's equality [publication number CN1465427A] can be
O is catalytically decomposed under room temperature simultaneously3And CO.Load is prepared using deposition-precipitation method in Wang Donghui etc. [publication number CN1498680A]
Nano catalyst on complex carrier, which shows the function of very outstanding catalysis CO conversion, and has fine
Prospects for commercial application.Nearest An Lidun equal [publication number CN03/068389A1] using catalyst surface nanogold particle with
Strong interaction and part gold particle and transition metal between spinel structure transition metal oxide form alloy knot
Structure carrys out steady load type nano Au particle, so that structure and catalytic activity of the guarantee during long-time service and storage is steady
It is qualitative.
The present invention be then from another angle, by nano Au particle be diffused into porous carrier it is mesoporous in, to limit
Growing up for during using and storing nanoparticle has been made, therefore has obtained urging with the nanogold of greater activity and stability
Agent.
Summary of the invention
It is an object of the invention to be directed to the shortcomings of the prior art, a kind of loaded nano golden light is provided and is urged
Agent and preparation method thereof, solve Au catalyst in the prior art the anti-caking power of high temperature and catalyst stability i.e.
The poor technical problem of performance in terms of catalytic life.
To achieve the goals above, the technical scheme adopted by the invention is that:
The active constituent of a kind of load type nano gold catalyst, the catalyst is noble metal gold Au, and carrier is mixed for cerium oxide
Miscellaneous mesoporous TiO 2, the catalyst is by golden Au nanometer particle load to bigger serface, the cerium oxide-doped of high-crystallinity
Meso-porous titanium dioxide titanium carrier on formed, gold nanoparticle and bigger serface, high-crystallinity mesoporous TiO 2 weight
Than being 2~5: 80.
As improvement to above-mentioned technical proposal, the precursor of active constituent gold comes from gold chloride hydrate HAuCl4·3H2O,
Chlorauride AuCl3Or Au2Cl6Or Complexes Precursor: KAu (CN)2Or [Au (en)2]Cl3。
The step of present invention simultaneously provides the preparation method of above-mentioned catalyst, the preparation method is:
S1, surfactant and citric acid are added to the water together, are stirred 10~30 minutes at room temperature, surfactant
Mass ratio with citric acid is 1: 2~2: 1；Institute's amount of water needs for surfactant and citric acid to be completely dissolved；
S2, be separately added into the resulting mixed solution of step S1 bimetallic source (titanium source, cerium source) and active constituent gold
The phenolic resin ethanol solution that mass percent concentration is 15~25% is added, at 30~50 DEG C in precursor solution after dissolving completely
It is sufficiently stirred to form homogeneous phase solution under water-bath, be then poured into a container, 10~30h is placed in 30~50 DEG C of baking ovens, so
It places 10~30h in 80~105 DEG C of baking ovens afterwards to be crosslinked, to obtain the transparent membranoid substance of crocus；
S3, it will wash, be centrifugated after the cooling of step (2) products therefrom；Then control temperature be respectively 400~
2h is roasted at 500 DEG C to get the mesoporous TiO 2 nano catalyst of cerium oxide-doped.
As improvement to above-mentioned technical proposal, the surfactant is F127.
As improvement to above-mentioned technical proposal, washing process uses distilled water or ammonia scrubbing, wash temperature 20~
70 DEG C, calcination atmosphere is the gaseous mixture of air, oxygen or volume ratio 5~10% hydrogen and nitrogen.
Compared with prior art, the beneficial effects of the present invention are:
Load type nano gold catalyst of the invention, using bigger serface, high-crystallinity cerium oxide-doped it is mesoporous
Titanium dioxide is carrier, and the bigger serface of the carrier can increase the dispersibility between gold nanoparticle, so that high temperature be avoided to burn
Aggregation caused by the migration because of caused by high temperature between nanoparticle, avoids catalytic performance caused by increasing because of nanoparticle when knot
It reduces, so as to improve the stability of Au nanoparticle catalyst.Meanwhile positioned at the gold nanoparticle and load of mesopore orbit and surface
A variety of contacts between body, can also further increase its stability；The titanium dioxide of high-crystallinity advantageously reduces surface and lacks
It falls into, improves the active force of titanium dioxide and gold nanoparticle, inhibit the growth of gold nanoparticle at high temperature.It is high-crystallinity, big
These advantages of specific surface area mesoporous TiO 2 can effectively increase the nano titania Au catalyst of cerium oxide-doped
Anti- caking power, improve its catalytic stability.And the doping of Ce elements can be in conjunction with titanium dioxide, under its synergistic effect
Its CO catalytic activity can effectively be reinforced, in -10 DEG C of energy as the carrier of golden active specy with gold particle combination
Enough to convert CO completely, activity and stability are preferable.
The present invention is compared with prior art, and technological progress is significant.The mesoporous TiO 2 nanometer of cerium oxide-doped
Au catalyst is demonstrated by very high anti-sintering property and the steady activity of catalysis in CO catalytic oxidation system.
Specific embodiment
Embodiments of the present invention are illustrated by particular specific embodiment below, those skilled in the art can be by this explanation
Content disclosed by book is understood other advantages and efficacy of the present invention easily.
Embodiment 1:
The load type nano gold catalyst of the present embodiment 1, the active constituent of catalyst are noble metal gold Au, and carrier is oxidation
The mesoporous TiO 2 of cerium dopping, the catalyst is by golden Au nanometer particle load to bigger serface, the cerium oxide of high-crystallinity
It is formed on the meso-porous titanium dioxide titanium carrier of doping, the mesoporous TiO 2 of gold nanoparticle and bigger serface, high-crystallinity
Weight ratio is 2: 80.The precursor of active constituent gold comes from gold chloride hydrate HAuCl4·3H2O, chlorauride AuCl3Or Au2Cl6,
Or Complexes Precursor: KAu (CN)2Or [Au (en)2]Cl3。
The step of load type nano gold catalyst preparation method, is:
S1, surfactant and citric acid are added to the water together, are stirred 10 minutes at room temperature, surfactant and lemon
The mass ratio of lemon acid is 1: 2；Institute's amount of water needs for surfactant and citric acid to be completely dissolved；
S2, be separately added into the resulting mixed solution of step S1 bimetallic source (titanium source, cerium source) and active constituent gold
Precursor solution is added the phenolic resin ethanol solution that mass percent concentration is 15%, fills under 30 DEG C of water-baths after dissolving completely
Divide stirring to form homogeneous phase solution, is then poured into a container, places 10h in 30 DEG C of baking ovens, then put in 80 DEG C of baking ovens
It sets 10h to be crosslinked, to obtain the transparent membranoid substance of crocus；
S3, it will wash, be centrifugated after the cooling of step (2) products therefrom；Then control temperature is respectively at 400 DEG C
2h is roasted to get the mesoporous TiO 2 nano catalyst of cerium oxide-doped.The surfactant is F127.
Washing process uses distilled water or ammonia scrubbing, and for wash temperature at 20 DEG C, calcination atmosphere is air, oxygen or volume
Than the gaseous mixture of 5% hydrogen and nitrogen.
Embodiment 2:
The load type nano gold catalyst of the present embodiment 2, the active constituent of catalyst are noble metal gold Au, and carrier is oxidation
The mesoporous TiO 2 of cerium dopping, the catalyst is by golden Au nanometer particle load to bigger serface, the cerium oxide of high-crystallinity
It is formed on the meso-porous titanium dioxide titanium carrier of doping, the mesoporous TiO 2 of gold nanoparticle and bigger serface, high-crystallinity
Weight ratio is 5: 80.The precursor of active constituent gold comes from gold chloride hydrate HAuCl4·3H2O, chlorauride AuCl3Or Au2Cl6,
Or Complexes Precursor: KAu (CN)2Or [Au (en)2]Cl3。
The step of load type nano gold catalyst preparation method, is:
S1, surfactant and citric acid are added to the water together, are stirred 30 minutes at room temperature, surfactant and lemon
The mass ratio of lemon acid is 2: 1；Institute's amount of water needs for surfactant and citric acid to be completely dissolved；
S2, be separately added into the resulting mixed solution of step S1 bimetallic source (titanium source, cerium source) and active constituent gold
Precursor solution is added the phenolic resin ethanol solution that mass percent concentration is 25%, fills under 50 DEG C of water-baths after dissolving completely
Divide stirring to form homogeneous phase solution, is then poured into a container, places 30h in 50 DEG C of baking ovens, then put in 105 DEG C of baking ovens
It sets 30h to be crosslinked, to obtain the transparent membranoid substance of crocus；
S3, it will wash, be centrifugated after the cooling of step (2) products therefrom；Then control temperature is respectively at 500 DEG C
2h is roasted to get the mesoporous TiO 2 nano catalyst of cerium oxide-doped.The surfactant is F127.
Washing process uses distilled water or ammonia scrubbing, and for wash temperature at 70 DEG C, calcination atmosphere is air, oxygen or volume
Than the gaseous mixture of 10% hydrogen and nitrogen.
Load type nano gold catalyst of the invention, using bigger serface, high-crystallinity cerium oxide-doped it is mesoporous
Titanium dioxide is carrier, and the bigger serface of the carrier can increase the dispersibility between gold nanoparticle, so that high temperature be avoided to burn
Aggregation caused by the migration because of caused by high temperature between nanoparticle, avoids catalytic performance caused by increasing because of nanoparticle when knot
It reduces, so as to improve the stability of Au nanoparticle catalyst.Meanwhile positioned at the gold nanoparticle and load of mesopore orbit and surface
A variety of contacts between body, can also further increase its stability；The titanium dioxide of high-crystallinity advantageously reduces surface and lacks
It falls into, improves the active force of titanium dioxide and gold nanoparticle, inhibit the growth of gold nanoparticle at high temperature.It is high-crystallinity, big
These advantages of specific surface area mesoporous TiO 2 can effectively increase the nano titania Au catalyst of cerium oxide-doped
Anti- caking power, improve its catalytic stability.And the doping of Ce elements can be in conjunction with titanium dioxide, under its synergistic effect
Its CO catalytic activity can effectively be reinforced, in -10 DEG C of energy as the carrier of golden active specy with gold particle combination
Enough to convert CO completely, activity and stability are preferable.
The present invention is compared with prior art, and technological progress is significant.The mesoporous TiO 2 nanometer of cerium oxide-doped
Au catalyst is demonstrated by very high anti-sintering property and the steady activity of catalysis in CO catalytic oxidation system.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should be covered by the claims of the present invention.
Claims (5)
1. a kind of load type nano gold catalyst, it is characterised in that: the active constituent of the catalyst is noble metal gold Au, and carrier is
The mesoporous TiO 2 of cerium oxide-doped, the catalyst is by golden Au nanometer particle load to bigger serface, the oxygen of high-crystallinity
Change and is formed on the meso-porous titanium dioxide titanium carrier of cerium dopping, the meso-porous titanium dioxide of gold nanoparticle and bigger serface, high-crystallinity
The weight ratio of titanium is 2~5: 80.
2. load type nano gold catalyst according to claim 1, it is characterised in that: the precursor of active constituent gold comes from chlorine
Auric acid hydrate HAuCl4·3H2O, chlorauride AuCl3Or Au2Cl6Or Complexes Precursor: KAu (CN)2Or [Au (en)2]Cl3。
3. a kind of preparation method for preparing load type nano gold catalyst as claimed in claim 1 or 2, it is characterised in that: the system
The step of Preparation Method, is:
S1, surfactant and citric acid are added to the water together, are stirred 10~30 minutes at room temperature, surfactant and lemon
The mass ratio of lemon acid is 1: 2~2: 1；Institute's amount of water needs for surfactant and citric acid to be completely dissolved；
S2, the precursor that bimetallic source (titanium source, cerium source) and active constituent gold is separately added into the resulting mixed solution of step S1
The phenolic resin ethanol solution that mass percent concentration is 15~25% is added, in 30~50 DEG C of water-baths in solution after dissolving completely
Under be sufficiently stirred to form homogeneous phase solution, be then poured into a container, in 30~50 DEG C of baking ovens place 10~30h, then exist
It places 10~30h in 80~105 DEG C of baking ovens to be crosslinked, to obtain the transparent membranoid substance of crocus；
S3, it will wash, be centrifugated after the cooling of step (2) products therefrom；Then control temperature is respectively 400~500 DEG C
The lower 2h that roasts is to get the mesoporous TiO 2 nano catalyst of cerium oxide-doped.
4. the preparation method of load type nano gold catalyst according to claim 3, it is characterised in that: the surfactant
For F127.
5. the preparation method of load type nano gold catalyst according to claim 3, it is characterised in that: washing process is using steaming
Distilled water or ammonia scrubbing, for wash temperature at 20~70 DEG C, calcination atmosphere is air, oxygen or 5~10% hydrogen of volume ratio and nitrogen
The gaseous mixture of gas.
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| CN201711060998.4A CN109985625A (en) | 2017-11-02 | 2017-11-02 | A kind of load type nano gold photochemical catalyst and preparation method thereof |
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| CN201711060998.4A CN109985625A (en) | 2017-11-02 | 2017-11-02 | A kind of load type nano gold photochemical catalyst and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112844436A (en) * | 2021-01-27 | 2021-05-28 | 宁波方太厨具有限公司 | Catalyst for removing formaldehyde and carbon monoxide by catalysis and preparation method thereof |
| CN114345327A (en) * | 2022-03-01 | 2022-04-15 | 南京艾伊科技有限公司 | Supported nano-gold catalyst of electrochemical sulfur dioxide sensor and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112844436A (en) * | 2021-01-27 | 2021-05-28 | 宁波方太厨具有限公司 | Catalyst for removing formaldehyde and carbon monoxide by catalysis and preparation method thereof |
| CN114345327A (en) * | 2022-03-01 | 2022-04-15 | 南京艾伊科技有限公司 | Supported nano-gold catalyst of electrochemical sulfur dioxide sensor and preparation method thereof |
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