CN109908950A - A kind of solid alkali biodiesel catalyst and preparation method thereof - Google Patents
A kind of solid alkali biodiesel catalyst and preparation method thereof Download PDFInfo
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- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
Abstract
The invention discloses a kind of solid alkali biodiesel catalysts and preparation method thereof, comprising the following steps: molecular sieve carries out to pore creating material is modified, nitric acid solution is modified and TiO2Hydrosol reaction, obtains complex carrier；Complex carrier is impregnated into Ca (AC)2In the mixing saturated aqueous solution of yttrium acetate, 5-10h then is roasted at 700-900 DEG C, obtains solid alkali biodiesel catalyst.The reaction condition of solid base catalyst of the present invention is mild, show good catalytic activity, it applies it in the preparation process of biodiesel, the yield of biodiesel is up to 96% or more, and catalyst of the invention is also easy to separate from product, post-processing is simple, without repeatedly washing, can avoid the discharge of a large amount of waste liquids.
Description
Technical field
The invention belongs to catalyst technical fields, and in particular to a kind of solid alkali biodiesel catalyst and its preparation side
Method.
Background technique
Biodiesel is to pass through the long-chain fatty acid ester that ester exchange reaction obtains with low-carbon alcohols using animal and plant fat as raw material
Class compound is a kind of diesel oil substitute, has the advantages that Cetane number is high, sulfur content is low, biodegradable, is a kind of novel
The environmentally friendly energy.There is huge potentiality and wide city's scene with biodiesel substitution petrifaction diesel.
Currently, industrially homogeneous catalyst caustic alkali such as sodium hydroxide or potassium hydroxide is usually used in production biodiesel
As the catalyst to carrying out ester exchange reaction, although this method reaction efficiency is high, the antiacid caustic corrosion to consersion unit
The requirement of ability is very high, and after reaction, and the separation process of catalyst is more complicated, need through peracid neutralize, washing, from
The separating steps such as the heart can just obtain the biodiesel of high-purity, and can also generate a large amount of brine wastes in the process of washing,
The presence of these waste water increases the pressure of wastewater treatment.
For these reasons, people begin one's study the biodiesel catalyst that can be substituted, the solid of heterogeneous catalysis
Alkali biodiesel catalyst is increasingly becoming the hot spot of research.Solid alkali biodiesel catalyst compared to for homogeneous catalyst more
With advantage, has the advantages that be easy to separate with product, can reuse and small to consersion unit corrosivity.But at present
Solid base catalyst that there are load capacity is low, low so as to cause catalyst activity, catalytic efficiency is low.Therefore, it is necessary to research and develop
A kind of new solid alkali biodiesel catalyst out, to solve defect existing for existing solid alkali biodiesel catalyst.
Summary of the invention
The present invention provides a kind of solid alkali biodiesel catalyst, solves solid base catalyst presence in the prior art
Load capacity it is low, catalytic efficiency low problem low so as to cause catalyst activity.
The first purpose of the invention is to provide a kind of preparation methods of solid alkali biodiesel catalyst, including following step
It is rapid:
Step 1, the preparation of complex carrier
Step 1.1, molecular sieve modified
It pulverizes after molecular sieve and pore creating material are mixed according to the ratio of 30:1-3, obtains mixed powder；Mixed powder is existed
It is sintered at 300-350 DEG C, obtains pre- modified molecular screen；
Using dilute HNO3Solution activates pre- modified molecular screen, and activation finishes to obtain modified molecular screen；
Step 1.2, TiO is prepared2The hydrosol
Hydrolysis 3-5h, end of reaction obtain metatitanic acid precipitating at room temperature after tetrabutyl titanate and water mixing；Toward partially
The dense HNO that mass concentration is 80% is added in metatitanic acid precipitating3The hydrogen peroxide that solution and mass concentration are 35% obtains after reacting 1-2h
To TiO2The hydrosol；
Wherein, tetrabutyl titanate, water, dense HNO3Solution, hydrogen peroxide amount ratio be 0.5-1g:100ml:0.05g:1g；
Step 1.3, complex carrier is prepared
Modified molecular screen is impregnated into TiO2In the hydrosol, aqueous slkali, regulation system is added dropwise thereto under agitation
PH is neutrality, then impregnates filtering, drying after 3-5h, then roasts 5-6h at 500-550 DEG C, roasting finish obtain it is described multiple
Close carrier；
Wherein, modified molecular screen and TiO2The mass ratio of the hydrosol is 1-3:10；
Step 2, Ca (AC) is prepared respectively2With the saturated aqueous solution of yttrium acetate, by Ca (AC)2Saturated aqueous solution and acetic acid
The saturated aqueous solution of yttrium is uniformly mixed according to the mass ratio of 8-10:1, obtains mixed solution；
The complex carrier prepared in step 1.3 is impregnated into 10-15h in mixed solution, then filters, is dry, then
5-10h is roasted at 700-900 DEG C to get the solid alkali biodiesel catalyst is arrived.
When being roasted at 700-900 DEG C, Ca (AC)2Corresponding oxide such as calcium oxide, oxygen can be all resolved into yttrium acetate
Change yttrium load over a molecular sieve, and calcium oxide, yttrium oxide are the catalytic active substance of solid alkali biodiesel catalyst.
Preferably, the molecular sieve is type ZSM 5 molecular sieve or ZSM-35 type molecular sieve, and the pore creating material is polyphenyl second
Alkene.
Preferably, molecular sieve and pore creating material are ground into 800 mesh in the step 1.1.
Preferably, using dilute HNO3Solution activates pre- modified molecular screen, and specific step is as follows: by pre- modification point
Son sieve and dilute HNO3Solution activates 2h after mixing according to the ratio of 1g:10ml at 60 DEG C, pre- modified molecular screen after activation
With drying after water repeated flushing to neutrality, modified molecular screen is obtained.
Preferably, dilute HNO3The mass concentration of solution is 30%.
Preferably, aqueous slkali is sodium hydrate aqueous solution that mass concentration is 30% in step 1.3.
A second object of the present invention is to provide a kind of solid alkali biodiesel catalysts prepared using the above method.
Compared with prior art, the beneficial effects of the present invention are:
1) present invention carries out pre- modification to molecular sieve using pore creating material first, produces more in pre- modified molecular sieve
The metal oxide of absorption carriage is carried out in more, bigger hole, to increase the load capacity of active constituent on carrier；Pre- modified point
Son sieve uses dilute HNO again3Solution carries out thermal activation, removes the impurity in gap, expands molecular sieve bore diameter, increases basic site
Quantity is conducive to the load of metal oxide and the enhancing of catalytic activity；Modified molecular screen after activation again with TiO2The hydrosol
Reaction, preparation load have TiO2Complex carrier, TiO2Load on the one hand can be improved the mechanical strength of catalyst, another party
Face can also improve metal oxide-loaded dispersion performance, avoid agglomeration, to sum up, after above-mentioned processing
To complex carrier more suitable coordination environment is provided for active metal, keep calcium oxide and yttrium oxide and carrier close
In conjunction with playing catalytic action.
2) calcium oxide and yttrium oxide are used cooperatively by the present invention, and are supported on carrier, and the addition of yttrium oxide improves oxygen
Change the catalytic activity of calcium, and then improve the catalytic activity of ester exchange reaction, the addition that analysis reason is likely to be yttrium oxide increases
The base strength for having added catalyst, improves the quantity of highly basic position, and then improves the activity of catalyst.
3) reaction condition of solid base catalyst of the present invention is mild, shows good catalytic activity, applies it to life
In the preparation process of object diesel oil, the yield of biodiesel is up to 96% or more, and catalyst of the invention is also easy to from product
Separation, post-processing is simple, without repeatedly washing, can avoid the discharge of a large amount of waste liquids.
Specific embodiment
In order to enable those skilled in the art to more fully understand, technical solution of the present invention is practiced, below with reference to specific
The invention will be further described for embodiment, but illustrated embodiment is not as a limitation of the invention.
The test method of actual conditions is not specified in following embodiments, according to conventional methods in the art with condition into
The row raw material is commercially available unless otherwise specified.
Embodiment 1
A kind of preparation method of solid alkali biodiesel catalyst, comprising the following steps:
Step 1, the preparation of complex carrier
Step 1.1, molecular sieve modified
It is ground into the powder of 800 mesh after the type ZSM 5 molecular sieve of 30g is mixed with 1g polystyrene, obtains mixed powder；It will mix
It closes powder to be sintered at 300 DEG C, obtains pre- modified molecular screen；
The dilute HNO for being 30% by pre- modified molecular screen and 300ml mass concentration32h is activated at 60 DEG C after mixing, is activated
After it is dry at 100 DEG C after pre- modified molecular screen water repeated flushing to neutrality, obtain modified molecular screen；
Step 1.2, TiO is prepared2The hydrosol
Hydrolysis 5h, end of reaction obtain metatitanic acid and sink at room temperature after 1g tetrabutyl titanate and 200ml water are mixed
It forms sediment；The dense HNO that 0.1g mass concentration is 80% is added into metatitanic acid precipitating3The dioxygen that solution and 2g mass concentration are 35%
Water obtains TiO after reacting 1h2The hydrosol；
Step 1.3, complex carrier is prepared
20g modified molecular screen is impregnated into the TiO of 68g2In the hydrosol, mass concentration is added dropwise thereto under agitation
For 30% sodium hydrate aqueous solution, regulation system pH is neutrality, then impregnates filtering, drying after 3h, then roast at 500 DEG C
6h, roasting, which finishes, obtains complex carrier；
Step 2, Ca (AC) is prepared respectively2With the saturated aqueous solution of yttrium acetate, by Ca (AC)2Saturated aqueous solution and acetic acid
The saturated aqueous solution of yttrium is uniformly mixed according to the mass ratio of 8:1, obtains mixed solution；
The complex carrier prepared in step 1.3 is impregnated into 15h in mixed solution, then filters, is dry, then 700
10h is roasted at DEG C to get solid alkali biodiesel catalyst is arrived.
Embodiment 2
A kind of preparation method of solid alkali biodiesel catalyst, comprising the following steps:
Step 1, the preparation of complex carrier
Step 1.1, molecular sieve modified
It is ground into 800 mesh powder after the type ZSM 5 molecular sieve of 30g is mixed with 2g polystyrene, obtains mixed powder；It will mixing
Powder is sintered at 350 DEG C, obtains pre- modified molecular screen；
The dilute HNO for being 30% by pre- modified molecular screen and 300ml mass concentration32h is activated at 60 DEG C after solution mixing,
It is dry at 100 DEG C after pre- modified molecular screen water repeated flushing to neutrality after activation, obtain modified molecular screen；
Step 1.2, TiO is prepared2The hydrosol
Hydrolysis 3h, end of reaction obtain metatitanic acid and sink at room temperature after 2g tetrabutyl titanate and 200ml water are mixed
It forms sediment；The dense HNO that 0.1g mass concentration is 80% is added into metatitanic acid precipitating3The dioxygen that solution and 2g mass concentration are 35%
Water obtains TiO after reacting 1.5h2The hydrosol；
Step 1.3, complex carrier is prepared
20g modified molecular screen is impregnated into the TiO of 100g2In the hydrosol, it is dense that quality is added dropwise thereto under agitation
The sodium hydrate aqueous solution that degree is 30%, regulation system pH are neutrality, then impregnate filtering, drying after 4h, then roast at 550 DEG C
5h is burnt, roasting, which finishes, obtains complex carrier；
Step 2, Ca (AC) is prepared respectively2With the saturated aqueous solution of yttrium acetate, by Ca (AC)2Saturated aqueous solution and acetic acid
The saturated aqueous solution of yttrium is uniformly mixed according to the mass ratio of 9:1, obtains mixed solution；
The complex carrier prepared in step 1.3 is impregnated into 12h in mixed solution, then filters, is dry, then 800
8h is roasted at DEG C to get solid alkali biodiesel catalyst is arrived.
Embodiment 3
A kind of preparation method of solid alkali biodiesel catalyst, comprising the following steps:
Step 1, the preparation of complex carrier
Step 1.1, molecular sieve modified
It pulverizes after the ZSM-35 type molecular sieve of 30g is mixed with 3g polystyrene, obtains mixed powder；Mixed powder is existed
It is sintered at 350 DEG C, obtains pre- modified molecular screen；
The dilute HNO for being 30% by pre- modified molecular screen and 300ml mass concentration32h is activated at 60 DEG C after solution mixing,
It is dry at 100 DEG C after pre- modified molecular screen water repeated flushing to neutrality after activation, obtain modified molecular screen；
Step 1.2, TiO is prepared2The hydrosol
Hydrolysis 4h, end of reaction obtain metatitanic acid at room temperature after 1.4g tetrabutyl titanate and 200ml water are mixed
Precipitating；The dense HNO that 0.1g mass concentration is 80% is added into metatitanic acid precipitating3The dioxygen that solution and 2g mass concentration are 35%
Water obtains TiO after reacting 2h2The hydrosol；
Step 1.3, complex carrier is prepared
20g modified molecular screen is impregnated into the TiO of 200g2In the hydrosol, it is dense that quality is added dropwise thereto under agitation
The sodium hydrate aqueous solution that degree is 30%, regulation system pH are neutrality, then impregnate filtering, drying after 5h, then roast at 520 DEG C
5.5h is burnt, roasting, which finishes, obtains complex carrier；
Step 2, Ca (AC) is prepared respectively2With the saturated aqueous solution of yttrium acetate, by Ca (AC)2Saturated aqueous solution and acetic acid
The saturated aqueous solution of yttrium is uniformly mixed according to the mass ratio of 10:1, obtains mixed solution；
The complex carrier prepared in step 1.3 is impregnated into 10h in mixed solution, then filters, is dry, then 900
5h is roasted at DEG C to get solid alkali biodiesel catalyst is arrived.
Effect in order to further illustrate the present invention, the present invention is also provided with comparative example, specific as follows.
Comparative example 1
A kind of preparation method of solid alkali biodiesel catalyst, comprising the following steps:
Step 1, the preparation of complex carrier
The preparation method of complex carrier is identical with embodiment 1；
Step 2, Ca (AC) is prepared2Saturated aqueous solution, by the complex carrier prepared in step 1.3 at Ca (AC)2It is full
With 15h is impregnated in aqueous solution, then filter, be dry, then roasting 10h at 700 DEG C and be catalyzed to get to solid alkali biodiesel
Agent.
Comparative example 2
A kind of preparation method of solid alkali biodiesel catalyst, comprising the following steps:
Step 1, the preparation of modified molecular screen carrier
Step 1.1, molecular sieve modified
It is ground into the powder of 800 mesh after the type ZSM 5 molecular sieve of 30g is mixed with 1g polystyrene, obtains mixed powder；It will mix
It closes powder to be sintered at 300 DEG C, obtains pre- modified molecular screen；
The dilute HNO for being 30% by pre- modified molecular screen and 300ml mass concentration32h is activated at 60 DEG C after mixing, is activated
After it is dry at 100 DEG C after pre- modified molecular screen water repeated flushing to neutrality, obtain modified molecular screen；
Step 2, Ca (AC) is prepared respectively2With the saturated aqueous solution of yttrium acetate, by Ca (AC)2Saturated aqueous solution and acetic acid
The saturated aqueous solution of yttrium is uniformly mixed according to the mass ratio of 8:1, obtains mixed solution；
The modified molecular screen carrier prepared in step 1 is impregnated into 15h in mixed solution, then filters, is dry, then
10h is roasted at 700 DEG C to get solid alkali biodiesel catalyst is arrived.
Comparative example 3
A kind of preparation method of solid alkali biodiesel catalyst, comprising the following steps:
Prepare Ca (AC) respectively2With the saturated aqueous solution of yttrium acetate, by Ca (AC)2Saturated aqueous solution and yttrium acetate it is full
It is uniformly mixed with aqueous solution according to the mass ratio of 8:1, obtains mixed solution；
Type ZSM 5 molecular sieve is impregnated into 15h in mixed solution, then filters, is dry, then roasting 10h at 700 DEG C,
Obtain solid alkali biodiesel catalyst.
Comparative example 4
A kind of preparation method of solid alkali biodiesel catalyst, comprising the following steps:
It prepares Ca (AC)2Saturated aqueous solution, by type ZSM 5 molecular sieve at Ca (AC)2Saturated aqueous solution in impregnate 15h,
Then it filters, is dry, then roasting 10h at 700 DEG C to get solid alkali biodiesel catalyst is arrived.
The physical performance index of embodiment 1-3 and comparative example the 1-4 solid alkali biodiesel catalyst prepared is carried out
Test, wherein GB/T1964-1996 " porous ceramics compressive strength test method " is carried out according to national standards for strength test, tool
Body the results are shown in Table 1.
The physical performance index of 1 solid alkali biodiesel catalyst of table
As it can be seen from table 1 the solid alkali biodiesel catalyst that embodiment 1-3 is prepared has biggish specific surface
Long-pending, biggish Kong Rong, aperture and intensity.Big specific surface area is conducive to active material and disperses in carrier surface, and catalyst
Average pore size be that 10nm or so is conducive to calcium oxide and yttrium oxide is received wherein there is certain amount aperture to be greater than the macropore of 10nm
Load of the rice corpuscles in aperture, further increases load capacity；The catalyst of embodiment 1-3 there are also good mechanical strength,
It is conducive to extend the long service life of catalyst.
Comparative example 1 does not add yttrium acetate when preparing complex carrier, and yttrium oxide refers to the physics for the catalyst prepared
Mark does not influence substantially, therefore the catalyst physical performance indicator of comparative example 1 and embodiment 1-3 are suitable；Comparative example 2 is multiple in preparation
TiO is not used when closing carrier2, TiO2It can be improved the mechanical strength of catalyst, moreover it is possible to improve metal oxide-loaded dispersion
Performance avoids agglomeration, therefore, from not adding TiO2Comparative example 2 in the specific surface area of catalyst, aperture, Kong Rong
All poor compared with embodiment and comparative example 1, mechanical strength is also poor, expands simultaneously because comparative example 2 have passed through acid processing during the preparation process
Aperture, therefore its aperture, Kong Rong be with good compared with comparative example 3-4, but aperture is larger and more also to affect it mechanical strong in aperture
Degree；Comparative example 3 is not modified molecular sieve when preparing complex carrier, therefore, the specific surface of catalyst in comparative example 3
Product, aperture, Kong Rong are poor compared with embodiment and comparative example 1-2；Comparative example 4 is equivalent to using common molecular sieve carried calcium oxide,
The physical performance index and comparative example 3 of obtained catalyst are suitable, but since comparative example 3 and comparative example 4 be not to molecule
Sieve is modified, and therefore, carrier aperture is smaller, and Kong Rong is also little, to keep mechanical strength big compared with comparative example 2.
The solid alkali biodiesel catalyst that embodiment 1-3 and comparative example 1-4 are prepared is applied to biodiesel
Illustrate effect of the invention in preparation process, detailed process is as follows.
Equipped with condenser pipe 250mL round bottom there-necked flask in be added 10g waste cooking oil, heating water bath to flow back after,
The solid base catalyst and 4g methanol of 0.2g embodiment 1, isothermal reaction 4h are added under the mixing speed of 500r/min；Reaction terminates
After be cooled to room temperature, be then centrifuged for isolating catalyst, centrifugate recycles excessive methanol, remaining liq mixing through rotary evaporation
Object stratification obtains the coarse biodiesel on upper layer and the crude glycerine of lower layer, then carries out vacuum distillation purification to coarse biodiesel
Processing collects the fraction that gas phase temperature is 170-240 DEG C, obtains colourless or pale yellowish oil liquid, as biodiesel.
Solid alkali biodiesel catalyst that embodiment 2-3 and comparative example 1-4 are prepared prepare the step of biodiesel and
The above method is identical, the difference is that the solid base catalyst of 0.2g embodiment 1 is substituted for 0.2g embodiment respectively
The solid base catalyst of 2-3 and comparative example 1-4.The performance for the biodiesel that embodiment and comparative example is prepared is detected,
Concrete outcome is shown in Table 2.
The performance indicator for the biodiesel that 2 embodiment and comparative example of table is prepared
From table 2 it can be seen that prepared using the solid alkali biodiesel catalyst of embodiment 1-3 and comparative example 1-4
The index of quality of biodiesel such as density, flash-point, kinematic viscosity, Cetane number, sulfur content, water content, condensation point are all satisfied GB/T
20828-2007 diesel fuel blending biodiesel (BD100) standard requirements.And embodiment 1-3 and comparative example 1-4 are obtained
The quality of biodiesel be not much different, the kinematic viscosity and sulfur content for being only in that the biodiesel that embodiment 1-3 is obtained are slightly
It is micro- lower.
Using the yield of gas chromatography analysis embodiment and comparative example biodiesel, the results are shown in Table 3.
The biodiesel production rate of 3 embodiment and comparative example of table
| Project | Yield (%) |
| Embodiment 1 | 96.3 |
| Embodiment 2 | 96.5 |
| Embodiment 3 | 95.9 |
| Comparative example 1 | 93.5 |
| Comparative example 2 | 91.3 |
| Comparative example 3 | 90.1 |
| Comparative example 4 | 88.6 |
From table 3 it can be seen that the production for the biodiesel prepared using the solid alkali biodiesel catalyst of embodiment 1-3
Rate reaches 96% or so, and effect is very good.Due to not adding yttrium acetate, compound load when preparing complex carrier in comparative example 1
Without load yttrium oxide on body, therefore its catalytic performance is more slightly worse than embodiment 1-3；Do not have when preparing complex carrier in comparative example 2
Use TiO2, therefore its catalytic performance is poorer than comparative example 2, illustrates in entire catalyst system, TiO2Effect more compared with yttrium oxide
It is important；Molecular sieve is not modified when preparing complex carrier in comparative example 3, therefore, catalytic effect is poor compared with comparative example 2,
Illustrate that the modification of molecular sieve is very important, can inherently influence the performance of catalyst；Comparative example 4 is equivalent to use
The performance of common molecular sieve carried calcium oxide, obtained catalyst is poor compared with comparative example 1-3, illustrate yttrium oxide in the present invention,
TiO2, modified molecular screen effect mutually promote, act synergistically, three cooperates the catalysis that can be just had excellent performance jointly
Agent.
The present invention describes preferred embodiment, and once a person skilled in the art knows basic creative general
It reads, then additional changes and modifications may be made to these embodiments.So it includes preferred real that the following claims are intended to be interpreted as
It applies example and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (7)
1. a kind of preparation method of solid alkali biodiesel catalyst, which comprises the following steps:
Step 1, the preparation of complex carrier
Step 1.1, molecular sieve modified
It pulverizes after molecular sieve and pore creating material are mixed according to the ratio of 30:1-3, obtains mixed powder；By mixed powder in 300-
It is sintered at 350 DEG C, obtains pre- modified molecular screen；
Using dilute HNO3Solution activates pre- modified molecular screen, and activation finishes to obtain modified molecular screen；
Step 1.2, TiO is prepared2The hydrosol
Hydrolysis 3-5h, end of reaction obtain metatitanic acid precipitating at room temperature after tetrabutyl titanate and water mixing；Toward metatitanic acid
The dense HNO that mass concentration is 80% is added in precipitating3The hydrogen peroxide that solution and mass concentration are 35%, obtains after reacting 1-2h
TiO2The hydrosol；
Wherein, tetrabutyl titanate, water, dense HNO3Solution, hydrogen peroxide amount ratio be 0.5-1g:100ml:0.05g:1g；
Step 1.3, complex carrier is prepared
Modified molecular screen is impregnated into TiO2In the hydrosol, it is added dropwise aqueous slkali thereto under agitation, during regulation system pH is
Property, filtering, drying after 3-5h are impregnated, then 5-6h is roasted at 500-550 DEG C, roasting, which finishes, obtains the complex carrier；
Wherein, modified molecular screen and TiO2The mass ratio of the hydrosol is 1-3:10；
Step 2, Ca (AC) is prepared respectively2With the saturated aqueous solution of yttrium acetate, by Ca (AC)2Saturated aqueous solution and yttrium acetate
Saturated aqueous solution is uniformly mixed according to the mass ratio of 8-10:1, obtains mixed solution；
The complex carrier prepared in step 1.3 is impregnated into 10-15h in mixed solution, filtering, drying after dipping, then
5-10h is roasted at 700-900 DEG C to get the solid alkali biodiesel catalyst is arrived.
2. the preparation method of solid alkali biodiesel catalyst according to claim 1, which is characterized in that the molecular sieve
For type ZSM 5 molecular sieve or ZSM-35 type molecular sieve, the pore creating material is polystyrene.
3. the preparation method of solid alkali biodiesel catalyst according to claim 2, which is characterized in that the step
Molecular sieve and pore creating material are ground into 800 mesh in 1.1.
4. the preparation method of solid alkali biodiesel catalyst according to claim 1, which is characterized in that use dilute HNO3
Solution activates pre- modified molecular screen, and specific step is as follows: by pre- modified molecular screen and dilute HNO3Solution is according to 1g:
2h is activated at 60 DEG C after the ratio mixing of 10ml, is done after pre- modified molecular screen water repeated flushing to neutrality after activation
It is dry, obtain modified molecular screen.
5. the preparation method of solid alkali biodiesel catalyst according to claim 4, which is characterized in that dilute HNO3
The mass concentration of solution is 30%.
6. the preparation method of solid alkali biodiesel catalyst according to claim 1, which is characterized in that in step 1.3
Aqueous slkali is the sodium hydrate aqueous solution that mass concentration is 30%.
7. a kind of solid alkali biodiesel catalyst that -6 any the methods are prepared according to claim 1.
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| CN115805086A (en) * | 2022-11-24 | 2023-03-17 | 上海中器环保科技有限公司 | Rare earth strong acid catalyst and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115805086A (en) * | 2022-11-24 | 2023-03-17 | 上海中器环保科技有限公司 | Rare earth strong acid catalyst and preparation method thereof |
| CN115805086B (en) * | 2022-11-24 | 2024-03-22 | 上海中器环保科技有限公司 | Rare earth strong acid catalyst and preparation method thereof |
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| CN109908950B (en) | 2021-08-06 |
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