CN103816910A - Preparation method of CeO2 microsphere loaded nano metal compound catalyst - Google Patents
Preparation method of CeO2 microsphere loaded nano metal compound catalyst Download PDFInfo
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- CN103816910A CN103816910A CN201410089598.6A CN201410089598A CN103816910A CN 103816910 A CN103816910 A CN 103816910A CN 201410089598 A CN201410089598 A CN 201410089598A CN 103816910 A CN103816910 A CN 103816910A
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Abstract
The invention belongs to the technical field of catalysis, relates to an amino-modified cerium oxide microsphere immobilized nano metal compound catalyst and a preparation method therefore, and provides an idea to build a carbon-stabilization based cerium oxide microsphere immobilized multivalent metal compound catalyst. The preparation method comprises the following steps: ultrasonic dispersing cerium oxide microspheres into toluene; modifying through APTES to obtain the amino-modified cerium oxide microspheres; then loading CoTPCPP on the amino-modified cerium oxide carrier through axial coordination; calcining the obtained sample at high temperature under a nitrogen atmosphere to obtain the cerium oxide microsphere immobilized nano metal compound catalyst. The catalyst prepared from the invention has relatively high catalytic activity and stability on the reaction of ehylbenzene selective catalytic oxidation by dioxygen under the solvent-free condition; the preparation method is simple, easy to control product quality and suitable for the fields of the selective oxidation alkanes reaction, the synthesis of medical intermediates and the like.
Description
Technical field
The invention belongs to catalyst field, be specifically related to CeO
2immobilized nano metal compound catalyst of microballoon and preparation method thereof.
Background technology
Ketone musk compounds is a kind of important chemical products, in dyestuff, medicine and catalyst preparation, is widely used.At present, aromatic ketone compounds is at anhydrous A1C1
3under catalysis, aromatic hydrocarbons obtains through Friedel-Crafts acylation reaction.When last handling process, be hydrolyzed AlCl
3produce a large amount of acid waste water, cause equipment corrosion and environmental pollution.And, as contained electron withdraw group on phenyl ring, should not prepare arone by Friedel-Crafts acyl group.Acetophenone also can distill and obtain in the residue of cumene oxidation phenol processed, acetone, and output is lower, and is subject to the restriction of other products market situation.Catalysis ethylbenzene oxidation acetophenone processed is a high-efficiency environment friendly route, and wherein homogeneous catalysis and heterogeneous catalysis are two large types of catalysis ethylbenzene oxidation.Homogeneous catalyst has reaction condition gentleness, high catalytic activity and the advantage such as selective, but the efficiency of catalyst is restricting their extensive use always, the cost of homogeneous phase metallic catalyst is generally all higher on the one hand, under homogeneous catalysis condition, be difficult to reclaim and recycling, on the other hand in catalysis engineering, catalyst (particularly heavy metal) easily runs off, to environment, while is easy polluted product also, in the preparation process of pharmaceutical intermediate, is particularly unacceptable.In order to address this problem, researcher has carried out a large amount of research, and what generally adopt now is by immobilized homogeneous catalyst this problem that solves.Wherein carrier has a significant impact the catalytic activity of catalyst.Many transition metal oxides, alkaline earth oxide, active carbon and molecular sieve can be served as the carrier of catalyst.
Therefore, in the present invention, we,, by divide the method for middle roasting different metal oxides carrier supported metalloporphyrin catalyst at nitrogen, have obtained nano metal compound catalyst.Prepare in the reaction of acetophenone being applied to ethylbenzene oxidation, find that this catalyst has good catalytic activity, selective and stability.
In the present invention, made the immobilized nano metal compound catalyst of different metal oxides.At present, both at home and abroad also not about open source literature and the patent application of preparing cerium dioxide micro-balloon load high dispersion metal compound for catalysis agent method by metalloporphyrin carbonizatin method.
Summary of the invention
The present invention be directed to the immobilized nano metal compound catalyst of a kind of cerium dioxide micro-balloon and the application in oxidation reaction of ethylbenzene thereof.This method adopts following technical scheme specific implementation: by after ultrasonic nano ceric oxide particle dispersion, dropwise add 3-aminopropyl triethoxysilane (APTES), make amino modified CeO
2microballoon, is then linked to amino modified CeO by organic complex by mono carboxylic cobalt porphyrin (CoTPCPP)
2on carrier, make porphyrin carbonization through the means of high-temperature calcination, make the immobilized nanometer cobalt compound catalyst of cerium dioxide micro-balloon.Be abbreviated as CeO
2-NH
2-CoTP/AC.
Preparation method's concrete steps of the immobilized nano metal compound catalyst of above-mentioned cerium dioxide micro-balloon are as follows:
(1) amino modified CeO
2synthesizing of silicon ball.
The CeO that is 1:20-40 by mass ratio
2with the ultrasonic dispersion of toluene mixture 10min, magnetic agitation, is warming up to 60 ℃, and slowly dripping volume ratio is the APTES of 1:1-3 and the mixed solution of toluene, reaction 24h.By isopyknic toluene and the each washed twice of methyl alcohol, spend the night 80 ℃ of vacuum drying.Products obtained therefrom is referred to as CeO
2-NH
2.
(2) CoTPCPP that is 1:10-20 by mass ratio and CeO
2-NH
2be dispersed in the CH of quality such as being equipped with
2cl
2in solution, back flow reaction 12-24h, cooling, then use isopyknic CH
2cl
2with the each washed twice of ethanol, at 80 ℃ of vacuum drying 12h, gained catalyst cartridge is written as CeO
2-NH
2-CoTP.
(3) by CeO
2-NH
2-CoTP is loaded in tube furnace, is warming up to 300-800 ℃, at N
2the lower calcining 1h of protection, is then cooled to room temperature naturally, and products obtained therefrom is referred to as CeO
2-NH
2-CoTP/AC.
The present invention the is prepared immobilized nano metal compound catalyst of cerium dioxide micro-balloon, and investigate the catalytic performance of its selective oxidation reaction to ethylbenzene.Reaction condition is: add 10mL ethylbenzene and proper catalyst, oxygen pressure is 0.8atm, reaction 5h, and oxidation product carries out quantitative analysis by gas-chromatography.Reactant liquor is left standstill, with ethanol washing, filter, after being dried, be recycled catalyst.Further to investigate the repeat performance of catalyst, catalyst repeat performance as shown in Figure 1.
The invention has the advantages that: (1) catalyst catalytic performance is good, and stability is higher, can reclaim, and reuses; (2) cerium dioxide micro-balloon can provide the microenvironment that is beneficial to reaction, has improved the activity and selectivity of catalyst.
Accompanying drawing explanation:
Fig. 1 is catalyst CeO
2-NH
2-CoTP/AC reuses effect to ethylbenzene selectivity catalytic oxidation, reaction condition: catalyst quality 30mg, ethylbenzene 10mL, O
2pressure 0.8atm, 120 ℃ of reaction temperatures, reaction time 5h.
The specific embodiment
Below in conjunction with embodiment, the present invention will be further described:
Embodiment 1
Synthesizing of mono carboxylic porphyrin.In 500mL there-necked flask, add 250mL propionic acid, 5.565g benzaldehyde and 2.625g4-carboxyl benzaldehyde, be heated to reflux, 4.69g pyrroles slowly splashed into constant pressure funnel, coutroi velocity, 20min adds.Under reflux conditions, continue reaction 30min and finish, after question response liquid cooling but, put into refrigerator and spend the night, suction filtration, silicagel column separates, i.e. synthetic mono carboxylic porphyrin.
Synthesizing of mono carboxylic manganoporphyrin and mono carboxylic ferriporphyrin.In 250mL there-necked flask, add 100mL DMF, 1.0g mono carboxylic porphyrin, is heated to reflux, and adds 2-3g CoCl in 1h in batches
26H
2o.After adding, some plate monitoring reaction process, after raw material point disappears, stops reaction.After question response liquid cooling but, add the distilled water of 2-3 times of volume, hold over night, suction filtration, uses hot water cyclic washing, obtains corresponding mono carboxylic porphyrin.
Amino modified CeO
2synthesizing of silicon ball.The SiO that is 1:20-40 by mass ratio
2with the ultrasonic dispersion of toluene mixture 10min, magnetic agitation, is warming up to 60 ℃, and slowly dripping volume ratio is the APTES of 1:1-3 and the mixed solution of toluene, reaction 24h.By isopyknic toluene wash and the each washed twice of methyl alcohol, spend the night 80 ℃ of vacuum drying.Products obtained therefrom is referred to as CeO
2-NH
2.In like manner, synthesized amino modified Fe
2o
3microballoon and amino modified Al
2o
3microballoon.
The preparation of catalyst.The CoTPCPP that is 1:5-20 by mass ratio and CeO
2-NH
2be dispersed in the CH of quality such as being equipped with
2cl
2in solution, back flow reaction 12-24h, cooling, then use isopyknic CH
2cl
2with the each washed twice of ethanol, at 80 ℃ of vacuum drying 12h, gained catalyst cartridge is written as CeO
2-NH
2-CoTP.By CeO
2-NH
2-CoTP is loaded in tube furnace, is warming up to 300-800 ℃, at N
2the lower calcining 1-3h of protection, products obtained therefrom is referred to as CeO
2-NH
2-CoTP/AC. in like manner, has prepared Fe
2o
3-NH
2-CoTP/AC and Al
2o
3-NH
2-CoTP/AC.
Embodiment 4
(catalyst is respectively: CeO in autoclave, to add 30mg catalyst
2-NH
2-CoTP/AC, Fe
2o
3-NH
2-CoTP/AC, Al
2o
3-NH
2-CoTP/AC and self-catalysis system) and 10mL ethylbenzene, being heated to 120 ℃, the pressure of oxygen is 0.8atm, reaction 5h, oxidation product carries out quantitative analysis by gas-chromatography.Under different catalysts catalytic condition, oxidation reaction of ethylbenzene selective data is known as shown in Table 1, under this paper experiment condition, selects CeO
2-NH
2-CoTP/AC catalysis oxidation reaction of ethylbenzene, generation benzyl carbinol and the acetophenone of energy high selectivity.
Embodiment 5
Catalyst repeat performance is investigated.Reactant liquor is left standstill, with ethanol washing, filter, after being dried, be recycled catalyst, for subsequent use, further to investigate the repeat performance of catalyst.The immobilized nano metal compound catalyst of amino modified ceria study on the stability result as shown in Figure 1.
Table 1: the contrast of different catalysts to selective oxidation ethylbenzene reacting catalytic performance
Note: reaction evaluating condition: catalyst quality: 30mg, ethylbenzene: 10ml, O
2pressure: 0.8atm, reaction temperature: 120 ℃, the reaction time: 5h.
Claims (7)
1. immobilized nano metal compound catalyst of cerium dioxide micro-balloon and preparation method thereof, it is characterized in that after the ultrasonic dispersion of cerium dioxide micro-balloon toluene, through 3-aminopropyl triethoxysilane (APTES) modification, make amino modified cerium dioxide micro-balloon, then mono carboxylic metallic cobalt porphyrin is loaded in amino modified ceria supports, gained sample through high-temperature calcination, makes the immobilized nanometer cobalt compound catalyst of cerium dioxide micro-balloon under nitrogen atmosphere, is abbreviated as CeO
2-NH
2-CoTPCPP/AC.
2. the preparation method of the immobilized metal compound as catalyst of cerium dioxide micro-balloon according to claim 1, is characterized in that being improved metal active center character and being stoped metallic compound particle to be grown up by metallo-organic complex method, and concrete steps are as follows:
(1) CeO that is 1:20-40 by mass ratio
2with the ultrasonic dispersion of toluene mixture 10min, magnetic agitation, is warming up to 60 ℃, the APTES that slowly dropping volume ratio is 1:1-3 and the mixed solution of toluene, reaction 24h, by isopyknic toluene and the each washed twice of methyl alcohol, spend the night 80 ℃ of vacuum drying, products obtained therefrom is referred to as CeO
2-NH
2.
(2) CoTPCPP that is 1:10-20 by mass ratio and CeO
2-NH
2be dispersed in the CH of quality such as being equipped with
2cl
2in solution, back flow reaction 12-24h, cooling, then use isopyknic CH
2cl
2with the each washed twice of ethanol, at 80 ℃ of vacuum drying 12h, gained catalyst cartridge is written as CeO
2-NH
2-CoTP.
3. according to claim 2(1) preparation method of described amino modified cerium dioxide micro-balloon, it is characterized in that ceria and toluene consumption are optimum for than being 1:30, the ratio of greater inequality of APTES and toluene consumption is 1:1.5.
4. according to claim 2(2) described load porphyrin preparation method, it is characterized in that CoTPCPP and CeO
2-NH
2the ratio of greater inequality of consumption is 1:10.
5. according to the preparation method of the immobilized nano metal compound catalyst of cerium dioxide micro-balloon described in claim 1 and 2, it is characterized in that obtaining the multivalence state metallic compound nano catalyst of carbon under stable after middle roasting and carbonization by dividing at nitrogen, concrete steps are as follows: by CeO
2-NH
2-CoTP is loaded in reaction tube, is warming up to 300-800 ℃, calcining 1h, and whole process passes into N
2protection, is then cooled to room temperature naturally, and products obtained therefrom is the immobilized nano metal compound catalyst of cerium dioxide micro-balloon, referred to as CeO
2-NH
2-CoTP/AC.
6. the preparation method of the immobilized nano metal compound catalyst of cerium oxide microballoon according to claim 5, is characterized in that calcining heat optimum is 500 ℃.
7. the prepared product of preparation method of the immobilized nano metal compound catalyst of cerium oxide microballoon as described in right 5.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107008335A (en) * | 2017-05-16 | 2017-08-04 | 福州大学 | A kind of cerium oxide is cobalt-based ammonia synthesis catalyst of carrier and preparation method thereof |
| CN109709180A (en) * | 2019-03-04 | 2019-05-03 | 济南大学 | A kind of photic electrochemical method of the organic semiconducting materials PC05 nano wire detection cancer cell of self assembly |
| CN113797953A (en) * | 2021-09-29 | 2021-12-17 | 广州珠矶科技有限公司 | Preparation and application method of nano catalyst for repairing organic pollution of underground water |
| CN115722197A (en) * | 2022-10-14 | 2023-03-03 | 遵义师范学院 | Modified CeO 2 Mesoporous material and preparation method and application thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101898156A (en) * | 2010-07-27 | 2010-12-01 | 湖南大学 | Preparation method for CeO2 doped organosilicon nanometer microsphere metal cobalt loaded (ii) porphyrin catalyst |
| CN103566935A (en) * | 2013-01-08 | 2014-02-12 | 湖南大学 | Preparation method of monatomic dispersion catalyst with high catalytic performance |
-
2014
- 2014-03-12 CN CN201410089598.6A patent/CN103816910A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101898156A (en) * | 2010-07-27 | 2010-12-01 | 湖南大学 | Preparation method for CeO2 doped organosilicon nanometer microsphere metal cobalt loaded (ii) porphyrin catalyst |
| CN103566935A (en) * | 2013-01-08 | 2014-02-12 | 湖南大学 | Preparation method of monatomic dispersion catalyst with high catalytic performance |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107008335A (en) * | 2017-05-16 | 2017-08-04 | 福州大学 | A kind of cerium oxide is cobalt-based ammonia synthesis catalyst of carrier and preparation method thereof |
| CN107008335B (en) * | 2017-05-16 | 2019-05-10 | 福州大学 | A kind of cerium oxide is the cobalt-based ammonia synthesis catalyst and preparation method thereof of carrier |
| CN109709180A (en) * | 2019-03-04 | 2019-05-03 | 济南大学 | A kind of photic electrochemical method of the organic semiconducting materials PC05 nano wire detection cancer cell of self assembly |
| CN109709180B (en) * | 2019-03-04 | 2021-03-23 | 济南大学 | Photoinduced electrochemical method for detecting cancer cells by using self-assembled organic semiconductor material PC05 nanowire |
| CN113797953A (en) * | 2021-09-29 | 2021-12-17 | 广州珠矶科技有限公司 | Preparation and application method of nano catalyst for repairing organic pollution of underground water |
| CN113797953B (en) * | 2021-09-29 | 2023-07-04 | 广州珠矶科技有限公司 | Preparation and application methods of nano catalyst for repairing organic pollution of underground water |
| CN115722197A (en) * | 2022-10-14 | 2023-03-03 | 遵义师范学院 | Modified CeO 2 Mesoporous material and preparation method and application thereof |
| CN115722197B (en) * | 2022-10-14 | 2024-03-01 | 遵义师范学院 | Modified CeO 2 Mesoporous material and preparation method and application thereof |
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Application publication date: 20140528 |