CN102234125B - Pseudo-boehmite containing alkali metal and/or alkaline earth metal component, and alumina prepared from pseudo-boehmite - Google Patents
Pseudo-boehmite containing alkali metal and/or alkaline earth metal component, and alumina prepared from pseudo-boehmite Download PDFInfo
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Abstract
The invention relates to a pseudo-boehmite containing alkali metal and/or alkaline earth metal component and alumina prepared from pseudo-boehmite. The content of the alkali metal and/or alkaline earth metal component in pseudo-boehmite is 0.05 to 20 wt% by oxide with a dry basis of pseudo-boehmite a reference, and pseudo-boehmite is a P1 containing at least one type of pseudo-boehmite with n which is more than or equal to 1.1 and less than or equal to 2.5; wherein n is a ratio of D(031) to D(120), the D(031) represents a crystal grain size of a crystal face represented by a peak 031 in an XRD spectra of pseudo-boehmite crystal grains, the D(120) represents a crystal grain size of a crystal face represented by a peak 120 in the XRD spectra of the pseudo-boehmite crystal grains, the peak 031 is a peak at 2*theta of 34-43 DEG in the XRD spectra, the peak 120 is a peak at 2*theta of 23-33 DEG in the XRD spectra, D is a ratio of K*lambda to (B*cos theta), K is the Scherrer constant, lambda is a diffraction wavelength of a target type material, B is a half band width of a diffraction peak, and 2*theta is a position of the diffraction peak.
Description
Invention field
The invention relates to boehmite and the aluminium oxide prepared therefrom of the component of a kind of alkali metal containing and/or alkaline-earth metal.
Background technology
Aluminium oxide, particularly gama-alumina, because it has better pore structure, specific surface and heat-resistant stability, the Chang Zuowei host material is used for Preparation of catalysts.The precursor of aluminium oxide is hydrated alumina, and as boehmite (or claiming quasi-crystalline boehmites), by the modification to hydrated alumina, people can carry out modulation to the character of aluminium oxide, make it satisfy some specific needs.
Summary of the invention
The technical problem to be solved in the present invention just provides a kind of new, improved alkali metal containing of performance and/or alkaline-earth metal adds boehmite and the aluminium oxide prepared therefrom of component.
The invention provides the boehmite of the component of a kind of alkali metal containing and/or alkaline-earth metal, be benchmark in oxide and with the butt of described boehmite, the content of alkali metal and/or alkaline earth metal component is 0.05-20 weight % in the described boehmite, and described boehmite is the boehmite P1 that comprises at least a 1.1≤n≤2.5; Wherein, n=D (031)/D (120), the crystallite dimension of the crystal face of 031 peak representative in the XRD spectra of described D (031) expression boehmite crystal grain, the crystallite dimension of the crystal face of 120 peak representatives in the XRD spectra of D (120) expression boehmite crystal grain, described 031 peak refers to that 2 θ in the XRD spectra are 34-43 ° peak, described 120 peaks refer to that 2 θ in the XRD spectra are 23-33 ° peak, D=K λ/(Bcos θ), K is the Scherrer constant, λ is the diffraction wavelength of target section bar material, B is the half-peak breadth of diffraction maximum, and 2 θ are the position of diffraction maximum.
The present invention further provides the aluminium oxide that a kind of alkali metal containing and/or alkaline-earth metal add component, the aluminium oxide that described alkali metal containing and/or alkaline-earth metal add component is obtained through roasting by aforementioned boehmite provided by the invention.
The boehmite of alkali metal containing provided by the invention and/or alkaline-earth metal interpolation component comprises the boehmite P1 of at least a 1.1≤n≤2.5.The boehmite that this alkali metal containing and/or alkaline-earth metal add component obtains the improved aluminium oxide of a kind of performance through roasting.
For example, described boehmite provided by the invention is obtained the gama-alumina of a kind of alkali metal containing and/or alkaline-earth metal interpolation component after 4 hours in 600 ℃ of roastings.Adopt this aluminium oxide as preparing carriers Fischer-Tropsch (F-T) synthetic catalyst, under the identical situation of activity of such catalysts metal component content, preparation condition, compare with the reference agent, the CO activity of conversion of catalyst improves can reach 6%, and methane selectively reduces by 2%.
The specific embodiment
According to described boehmite provided by the invention, be benchmark in oxide and with the butt of described boehmite, described alkali metal and/or alkaline-earth metal add components contents and are preferably 0.1-10 weight %, and described P1 is preferably the boehmite of 1.2≤n≤2.2.Butt described here refers to described boehmite percentage of the ratio of weight before the weight of 600 ℃ of roastings after 4 hours and the roasting under air atmosphere.
Add the boehmite of component according to containing metal provided by the invention, look finally aluminium oxide application target difference, the metal that is selected from alkali metal and/or alkaline-earth metal adds components contents, kind can be different.
For example, gama-alumina is to the conversion of Alpha-alumina phase when improving high-temperature roasting, improve the heat endurance of gama-alumina, contain in the preferred described boehmite and be selected from IIA family metal (Ca for example, Ba) interpolation metal component wherein, is several in oxide and described boehmite butt, described metal adds components contents can be selected between 0.05-20 weight %, and preferred content is 0.1-10 weight %.
For improving the activity of fischer-tropsch synthetic catalyst, contain in the preferred described boehmite and be selected from IA family metal (Li for example, K,), IIA family metal (Mg for example, Sr) one or more in wherein, are several in oxide and described boehmite butt, described metal adds components contents can be selected between 0.05-20 weight %, and preferred content is 0.1-10 weight %.
According to described boehmite provided by the invention, be enough to make described metal to add under the prerequisite that the content of component in described boehmite meets the demands, the introducing method that described metal is added component is not particularly limited.For example, can be in the process of the boehmite P1 for preparing described 1.1≤n≤2.5, to introduce the method introducing that containing metal adds the compound of component, also can be the boehmite P1 that at first prepares described 1.1≤n≤2.5, afterwards itself and containing metal be added the method introducing of the compound of component.Wherein, the compound that described containing metal adds component can be their salt, oxide or alkali, preferred water soluble compound wherein.
According to described boehmite provided by the invention, wherein, the preparation method of the boehmite P1 of described 1.1≤n≤2.5 comprises: aluminum contained compound solution is contacted with acid or alkali carry out precipitation reaction, perhaps organic aluminum contained compound is contacted the reaction that is hydrolyzed with water, obtain hydrated alumina; The above-mentioned hydrated alumina that obtains is worn out, wherein, described aluminum contained compound solution and acid or alkali contact or described organic aluminum contained compound and water contact and hydrated alumina aging in any one process in the presence of the grain growth conditioning agent, carry out, described grain growth conditioning agent is for can regulate the material of the speed of growth of crystal grain on different crystal faces.
As long as although make hydrolysis or precipitation reaction and aging in one of arbitrary process in the presence of the grain growth conditioning agent, carry out realizing purpose of the present invention, but under the preferable case, described hydrolysis and ageing process or described precipitation reaction and ageing process are all carried out in the presence of the grain growth conditioning agent, can make the n of gained boehmite like this in preferred 1.2≤n≤2.2 scopes.
Wherein, there is no particular limitation to the consumption of grain growth conditioning agent, the consumption of grain growth conditioning agent is the 0.5-10 weight % that treats organic aluminum contained compound weight of hydrolysis in the selective hydrolysis reaction, more preferably 1-8.5 weight %, further preferred 5-8.5 weight %; The consumption of grain growth conditioning agent is the inorganic 0.5-10 weight % that contains al reactant weight in the described precipitation reaction, more preferably 1-8.5 weight %, further preferred 5-8.5 weight %; In the described ageing process, the consumption of grain growth conditioning agent can be preferably 1-8.5 weight % for the 0.5-10 weight % of hydrated alumina weight, further preferred 5-8.5 weight %.Unless stated otherwise, among the present invention, the consumption of described grain growth conditioning agent is that benchmark calculates with the weight of aluminium oxide corresponding in organic aluminum contained compound, inorganic aluminum contained compound and the hydrated alumina respectively.Also be, in aluminium oxide, in the described precipitation reaction, the consumption of described grain growth conditioning agent is the 0.5-10 weight % of inorganic aluminum contained compound weight, in the described hydrolysis, the consumption of described grain growth conditioning agent is the 0.5-10 weight % of organic aluminum contained compound weight, and in the described ageing process, the consumption of described grain growth conditioning agent is the 0.5-10 weight % of hydrated alumina weight.
Among the present invention, described grain growth conditioning agent can be the various materials that can regulate the speed of growth of crystal grain on different crystal faces, particularly can regulate crystal grain at the material of the speed of growth of 120 crystal faces and 031 crystal face, be preferably alditol and carboxylate thereof, be specifically as follows in D-sorbite, glucose, gluconic acid, gluconate, ribitol, ribonic acid, the ribose hydrochlorate one or more.Described gluconate and ribose hydrochlorate can be their soluble-salt separately, for example, can be in sylvite, sodium salt and the lithium salts one or more.
In boehmite preparation process of the present invention, adding mode to described grain growth conditioning agent is not particularly limited, the grain growth conditioning agent can be added separately, also can be in advance the grain growth conditioning agent be mixed with wherein one or more raw materials, and then the raw material that will contain the grain growth conditioning agent reacts.
Wherein, described inorganic aluminum contained compound solution can be various aluminum salt solutions and/or aluminate solution, and described aluminum salt solution can be various aluminum salt solutions, for example can be one or more the aqueous solution in aluminum sulfate, aluminium chloride, the aluminum nitrate.Because price is low, preferably sulfuric acid aluminium, liquor alumini chloridi.Aluminium salt can use separately also and can use two kinds or more of mixing back.Described aluminate solution is aluminate solution arbitrarily, as sodium aluminate solution and/or potassium aluminate.Because its acquisition is easy and price is low, preferred sodium aluminate solution.Aluminate solution also can be used alone or as a mixture.
Concentration to described aluminum salt solution and/or aluminate solution is not particularly limited, and preferably counts the 0.2-1.1 mol with aluminium oxide.
Described acid can be various Bronsted acids or be acid oxide in aqueous medium, for example, can be in sulfuric acid, hydrochloric acid, nitric acid, carbonic acid, phosphoric acid, formic acid, acetic acid, citric acid, the oxalic acid one or more, preferred Bronsted acid be selected from one or more in nitric acid, sulfuric acid, the hydrochloric acid.Described carbonic acid can original position produces by feed carbon dioxide in aluminum salt solution and/or aluminate solution.Concentration to described acid solution is not particularly limited, preferred H
+Concentration be the 0.2-2 mol.
Described aqueous slkali can for hydroxide or in aqueous medium hydrolysis make the aqueous solution be the salt of alkalescence, preferred hydroxide is selected from one or more in ammoniacal liquor, NaOH, the potassium hydroxide; Preferred salt is selected from one or more in sodium metaaluminate, potassium metaaluminate, carbonic hydroammonium, ammonium carbonate, sodium acid carbonate, sodium carbonate, saleratus, the potash.Concentration to described aqueous slkali is not particularly limited, preferred OH
-Concentration be the 0.2-4 mol.When during as alkali, when calculating the consumption of described grain growth conditioning agent, also considering the amount of corresponding aluminium oxide in sodium metaaluminate and/or the potassium metaaluminate with sodium metaaluminate and/or potassium metaaluminate.
Described organic aluminum contained compound can be various can with water generation hydrolysis, producing in the aluminum alkoxide of aqua oxidation aluminum precipitation one or more, for example can be in aluminium isopropoxide, isobutanol aluminum, aluminium isopropoxide, three tert-butoxy aluminium and the isooctanol aluminium one or more.Described organic aluminum contained compound and water consumption ratio are not particularly limited, and the preferred water yield is greater than the required amount of stoichiometry.
In boehmite preparation process of the present invention, the described condition of precipitation reaction that makes is not particularly limited, preferred pH value is 3-11, more preferably 6-10; Temperature can be 30-90 ℃, is preferably 40-80 ℃.
Wherein, it is conventionally known to one of skill in the art making the method for aluminum precipitation by the control of consumption to alkali in the reactant or acid.
Condition to described hydrolysis is not particularly limited, as long as water contacts with aluminum alkoxide hydrolysis generation hydrated alumina takes place, and the condition that hydrolysis specifically takes place is conventionally known to one of skill in the art.
Wherein, can in hydrolysis or precipitation reaction obtain slurries that the slurries of hydrated alumina or filter cake after filtering add the water preparation again, add the compound of crystal grain growth regulating effect, also can add aqueous slkali or acid solution and suitably regulate the pH value to 7-10, under suitable temperature, wear out then.Separate then, washing, drying.
Described acid solution or aqueous slkali can be with above-described identical or different.
Described aging temperature is preferably 35-98 ℃, and ageing time is preferably 0.2-6 hour.
According to method provided by the invention, the described known technology that is separated into this area is as the method for filtration or centrifugation or evaporation.
In boehmite preparation process of the present invention, after aging, also comprise the washing and the dry step that often comprise in the preparation boehmite process, described washing and dry method are preparation boehmite conventional process.For example, can use oven dry, forced air drying or spray-dired method.Generally speaking, baking temperature can be 100-350 ℃, is preferably 120-300 ℃.
According to the preparation method of boehmite of the present invention, an embodiment preferred may further comprise the steps:
(1) will contain the aluminum contained compound solution of grain growth conditioning agent and aqueous slkali or acid solution and stream or batch (-type) and join and carry out precipitation reaction in the reaction vessel, obtain the hydrated alumina slurries; Perhaps in deionized water, add the reaction that is hydrolyzed of grain growth conditioning agent and aluminum alkoxide, obtain the hydrated alumina slurries;
(2) filter cake behind the hydrated alumina dope filtration that step (1) is obtained adds in the aluminium oxide slurries that water making beating obtains again again, adds the grain growth conditioning agent, after regulating pH and being 7-10, in 35-98 ℃ of aging 0.2-6 hour; Also the hydrated alumina slurries that above-mentioned steps (1) can be obtained without filter the grain growth conditioning agent exist or not in the presence of be under the 7-10 at pH, in 35-98 ℃ of aging 0.2-6 hour;
(3) product that filter, washing step (2) obtains;
(4) product that obtains of drying steps (3) obtains the boehmite of 1.1≤n provided by the invention≤2.5.
When introducing described metal add the compound of component in the process of boehmite P1 of preparation described 1.1≤n≤2.5, described containing metal adds the compound of component can be introduced in above-mentioned step (1), (2), (3) or (4) any one or several steps.
According to described boehmite provided by the invention, optionally can also comprise the boehmite P2 except the boehmite of 1.1≤n≤2.5, described P2 is the boehmite of n＜1.1, preferred P2 is the boehmite of 0.8＜n＜1.1, and further preferred P2 is the boehmite of 0.85≤n≤1.05.When described composition contains P2, be benchmark with the boehmite total amount, the content of described P2 is not more than 70 weight %, further preferably is not more than 50 weight %, more preferably is not more than 30 weight %.Described P2 is 0.8＜n
2＜1.1 boehmite can be to be selected from the boehmite that commercially available commodity also can adopt any one prior art for preparing.
Described boehmite provided by the invention obtains the aluminium oxide that containing metal of the present invention adds component through roasting, and the method for described roasting is conventional method and condition.For example, when described purpose aluminium oxide was gama-alumina, described roasting condition comprised: sintering temperature is 350-950 ℃, is preferably 450-900 ℃, and roasting time is 1-12 hour, is preferably 2-8 hour.
According to aluminium oxide provided by the invention, optionally can be made into and be convenient to the article shaped of operating arbitrarily, as spherical, compressing tablet and bar shaped.Described moulding can be carried out according to a conventional method, all can as methods such as compressing tablet, spin, extrusions.
In one embodiment, described aluminium oxide article shaped preparation method comprises the boehmite P1 of described 1.1≤n≤2.5 (comprising or do not comprise boehmite P2), extrusion aid, peptizing agent and water is mixed, mixture is extrusion molding on banded extruder, carries out drying and roasting afterwards.Wherein, the example of described peptizing agent can be to be selected from nitric acid, acetic acid and the citric acid one or more; The example of described extrusion aid can be to be selected from sesbania powder, the cellulose one or more.The kind of the consumption of described water and described extrusion aid, peptizing agent and consumption are conventionally known to one of skill in the art, do not repeat them here.Described drying is conventional method, carries out drying as adopting baking oven, mesh-belt kiln and fluid bed, when adopting heating means to carry out drying, preferred baking temperature is 50-200 ℃, 0.3-12 hour drying time, further preferred baking temperature is 60-150 ℃, and be 0.5-8 hour drying time.The method of described roasting and condition are conventional method and the condition that the catalyst carrier preparation is adopted, as adopt mesh-belt kiln, upright examination stove and converter to carry out roasting, the condition of described roasting is preferably, at 350-950 ℃ roasting temperature 1-12 hour, further preferably 450-900 ℃ roasting temperature 2-8 hour.
The aluminium oxide of containing metal interpolation component provided by the invention can be used as the matrix of various adsorbents, catalyst carrier and catalyst and uses.
To the present invention be described by example below.Agents useful for same in the example except specifying, is chemically pure reagent.
Embodiment 1-6 illustrates described boehmite provided by the invention, aluminium oxide and preparation method thereof.
Embodiment 1
(1) containing metal adds the boehmite of component
In one 2.5 liters retort and stream add 700 ml concns be 96 gram aluminium oxide/liter, wherein contain the aluminum nitrate solution of 3.6 gram ribitol and the ammonia spirit that concentration is 8 weight % and carry out precipitation reaction, reaction temperature is 40 ℃, reaction time is 10 minutes, it is 7 that the flow of control ammonia spirit makes the pH of reaction system, after precipitation reaction finishes, adding in slurries and containing concentration is that to make the pH value of slurries be 8.5 for the ammoniacal liquor of 10 weight % potassium nitrate, slurries filtered after under 55 ℃ aging 60 minutes, filter cake washs 2 times with the deionized water making beating, filter cake was through 120 ℃ of dryings 24 hours, obtain hydrated alumina P1-1, adopt XRD to characterize, P1-1 has structure of similar to thin diaspore.
XRD measures at SIMENS D5005 type X-ray diffractometer, CuK α radiation, and 44 kilovolts, 40 milliamperes, sweep speed is 2 °/minute.According to the Scherrer formula: (D is crystallite dimension to D=K λ/(Bcos θ), λ is the diffraction wavelength of target section bar material, B is the half-peak breadth of corrected diffraction maximum, 2 θ are the position of diffraction maximum) be that grain size that the calculation of parameter at 23-33 ° of peak goes out (120) is D (120), is that the grain size that the calculation of parameter at 34-43 ° of peak goes out (031) is D (031) with 2 θ with 2 θ respectively, and calculate n=D (031)/D (120), characterize the n value that calculates P1-1 through XRD and list in the table 1.
(2) containing metal adds the aluminium oxide of component
The mixed solution of 3 gram nitric acid and 120 gram deionized waters is mixed with 200 gram P1-1, mix to pinch at the twin-screw banded extruder afterwards and be plastic, and be extruded into the column-shape strip of 1.1 millimeters of ф, wet bar is through 120 ℃ of dryings after 4 hours, in 600 ℃ of roastings 4 hours, obtain carrier Z1, carrier Z1 is characterized by gama-alumina through XRD.Adopt fluorescence spectrometry to add the content of metal component, adopt BET determination of nitrogen adsorption pore volume, specific area and can several apertures, the results are shown in table 2.
Comparative Examples 1-5 reference boehmite, aluminium oxide and preparation method thereof.
Comparative Examples 1
(1) containing metal adds the boehmite of component
Method according to embodiment 1-(1) prepares boehmite, and different is, the aluminum nitrate solution that contains ribitol by concentration be 96 gram aluminium oxide/liter aluminum nitrate solution replace, also be not contain ribitol in the aluminum nitrate solution, obtain hydrated alumina P2-1.Method according to embodiment 1 adopts XRD to characterize, and P2-1 has structure of similar to thin diaspore, characterizes the n value that calculates P2-1 through XRD and lists in the table 1.
(2) containing metal adds the aluminium oxide of component
Method according to embodiment 1-(2) adopts P2-1 to prepare aluminium oxide, obtains support C Z1, and support C Z1 is characterized by gama-alumina through XRD.Adopt fluorescence spectrometry to add the content of metal component, adopt BET determination of nitrogen adsorption pore volume, specific area and can several apertures, the results are shown in table 2.
Embodiment 2
(1) containing metal adds the boehmite of component
In one 2.5 liters retort and stream add 800 ml concns be 70 gram aluminium oxide/liter, gluconic acid content be the aluminum nitrate solution of 3.9 grams per liters and 300 milliliters contain 200 gram aluminium oxide/liter, the causticity coefficient is that 1.58 sodium aluminate solution carries out precipitation reaction, reaction temperature is 55 ℃, during the conditioned reaction logistics capacity makes and the pH value be 7.0, reaction stops after 15 minutes and filters, the gained solid is pulled an oar with deionized water, adding concentration then in the gained slurries is the potassium bicarbonate solution of 250 grams per liters, regulate slurries pH to 9.0, and be warming up to 65 ℃, aging 5 hours, filter with vacuum filter then, behind to be filtered the finishing, replenished adding 20 liters of deionized waters (65 ℃ of temperature) flush cake about 30 minutes at filter cake.Filter cake obtains hydrated alumina P1-2 through 120 ℃ of dryings 24 hours.Method according to embodiment 1 adopts XRD to characterize, and P1-2 has structure of similar to thin diaspore, characterizes the n value that calculates P1-2 through XRD and lists in the table 1.
(2) containing metal adds the aluminium oxide of component
Method according to embodiment 1-(2) adopts P1-2 to prepare aluminium oxide, obtains carrier Z2, and carrier Z2 is characterized by gama-alumina through XRD.Adopt fluorescence spectrometry to add the content of metal component, adopt BET determination of nitrogen adsorption pore volume, specific area and can several apertures, the results are shown in table 2.
Comparative Examples 2
(1) containing metal adds the boehmite of component
Method according to embodiment 2-(2) prepares boehmite, and different is, the aluminum sulfate solution that contains glucose change into concentration be 60 gram aluminium oxide/liter aluminum nitrate solution, obtain hydrated alumina P2-2.Method according to embodiment 1 adopts XRD to characterize, and P2-2 has structure of similar to thin diaspore, characterizes the n value that calculates P2-2 through XRD and lists in the table 1.
(2) containing metal adds the aluminium oxide of component
Method according to embodiment 1-(2) adopts P2-2 to prepare aluminium oxide, obtains support C Z2, and support C Z2 is characterized by gama-alumina through XRD.Adopt fluorescence spectrometry to add the content of metal component, adopt BET determination of nitrogen adsorption pore volume, specific area and can several apertures, the results are shown in table 2.
Embodiment 3
(1) containing metal adds the boehmite of component
In 2.5 liters of there-necked flasks of band stirring and reflux condensing tube, adding the ribonic acid sodium content is azeotropic mixture (water content is 15 weight %) 1000 grams of isopropyl alcohol-water of 0.5 weight %, be heated to 90 ℃, slowly be added dropwise in flask by separatory funnel 500 gram fusing aluminium isopropoxides, after the back flow reaction 24 hours, steam the dehydration isopropyl alcohol, divide then add for 3 times contain concentration be 2.2 weight % magnesium nitrates 1.5 liters of the deionized waters of ribonic acid sodium content 0.5 weight %, 90 ℃ were worn out 4 hours, in aging, steam aqueous isopropanol, after hydrated alumina after aging filters, through 120 ℃ of dryings 24 hours, obtain hydrated alumina P1-3.Method according to embodiment 1 adopts XRD to characterize, and P1-3 has structure of similar to thin diaspore, characterizes the n value that calculates P1-3 through XRD and lists in the table 1.
(2) containing metal adds the aluminium oxide of component
Method according to embodiment 1-(2) adopts P1-3 to prepare aluminium oxide, obtains carrier Z3, and carrier Z3 is characterized by gama-alumina through XRD.Adopt fluorescence spectrometry to add the content of metal component, adopt BET determination of nitrogen adsorption pore volume, specific area and can several apertures, the results are shown in table 2.
Comparative Examples 3
(1) containing metal adds the boehmite of component
Method according to embodiment 3-(1) prepares boehmite, and different is, does not add ribonic acid sodium in the azeotropic mixture of isopropyl alcohol-water (water content is 15 weight %) and the deionized water, obtains hydrated alumina P2-3.Method according to embodiment 1 adopts XRD to characterize, and P2-3 has structure of similar to thin diaspore, characterizes the n value that calculates P2-3 through XRD and lists in the table 1.
(2) containing metal adds the aluminium oxide of component
Method according to embodiment 1-(2) adopts P2-3 to prepare aluminium oxide, obtains support C Z3, and support C Z3 is characterized by gama-alumina through XRD.Adopt fluorescence spectrometry to add the content of metal component, adopt BET determination of nitrogen adsorption pore volume, specific area and can several apertures, the results are shown in table 2.
Embodiment 4
(1) containing metal adds the boehmite of component
In 2 liters of there-necked flasks of band stirring and reflux condensing tube, azeotropic mixture (water content is 15 weight %) 1000 grams that add isopropyl alcohol-water, be heated to 60 ℃, slowly be added dropwise in flask by separatory funnel 500 gram fusing aluminium isopropoxides, after the back flow reaction 20 hours, steam the dehydration isopropyl alcohol, divide then to add for 3 times and contain 1.5 liters of the deionized waters that concentration is the ribonic acid content 7 weight % of 12.8 weight % strontium nitrates, 60 ℃ were worn out 6 hours, aging pH value is 8, steams aqueous isopropanol in aging, after the hydrated alumina after wearing out filters, through 120 ℃ of dryings 24 hours, obtain hydrated alumina 1-P4.Method according to embodiment 1 adopts XRD to characterize, and P1-4 has structure of similar to thin diaspore, characterizes the n value that calculates P1-4 through XRD and lists in the table 1.
(2) containing metal adds the aluminium oxide of component
Method according to embodiment 1-(2) adopts P1-4 to prepare aluminium oxide, obtains carrier Z4, and carrier Z4 is characterized by gama-alumina through XRD.Adopt fluorescence spectrometry to add the content of metal component, adopt BET determination of nitrogen adsorption pore volume, specific area and can several apertures, the results are shown in table 2.
Comparative Examples 4
(1) boehmite
Get the commercial boehmite product SB powder that Sasol company sells, be numbered P2-4, according to the method employing XRD sign of embodiment 1, P2-4 has structure of similar to thin diaspore, characterizes the n value that calculates P2-4 through XRD and lists in the table 1.Adopt the method for dipping that strontium nitrate is introduced.
(2) aluminium oxide
Method according to embodiment 1-(2) adopts P2-4 to prepare aluminium oxide, obtains support C Z4, and support C Z4 is characterized by gama-alumina through XRD.Adopt fluorescence spectrometry to add the content of metal component, adopt BET determination of nitrogen adsorption pore volume, specific area and can several apertures, the results are shown in table 2.
Embodiment 5
(1) containing metal adds the boehmite of component
In 2.5 liters of there-necked flasks of band stirring and reflux condensing tube, azeotropic mixture (water content is 15 weight %) 1000 grams that add isopropyl alcohol-water, be heated to 60 ℃, slowly be added dropwise in flask by separatory funnel 500 gram fusing aluminium isopropoxides, after the back flow reaction 20 hours, steam the dehydration isopropyl alcohol, divide then to add for 3 times and contain 1.5 liters of the deionized waters that concentration is the ribonic acid content 7 weight % of 5.2 weight % calcium nitrate and 3.1 weight % lithium nitrates, 60 ℃ were worn out 6 hours, aging pH value is 8, steams aqueous isopropanol in aging, after the hydrated alumina after wearing out filters, through 120 ℃ of dryings 24 hours, obtain hydrated alumina P5.Method according to embodiment 1 adopts XRD to characterize, and P5 has structure of similar to thin diaspore, characterizes the n value that calculates P5 through XRD and lists in the table 1.
(2) containing metal adds the aluminium oxide of component
Method according to embodiment 1-(2) adopts P1-5 to prepare aluminium oxide, obtains carrier Z5, and carrier Z5 is characterized by gama-alumina through XRD.Adopt fluorescence spectrometry to add the content of metal component, adopt BET determination of nitrogen adsorption pore volume, specific area and can several apertures, the results are shown in table 2.
Comparative Examples 5
1) boehmite
Get the commercial boehmite product SD powder that mountain aluminium company of Chalco joint-stock company sells, be numbered P2-5, according to the method employing XRD sign of embodiment 1, P2-5 has structure of similar to thin diaspore, characterizes the n value that calculates this SD powder through XRD and lists in the table 1.Adopt the method for dipping that lithium nitrate is introduced.
(2) aluminium oxide
Method according to embodiment 1-(2) adopts P2-5 to prepare aluminium oxide, obtains support C Z5, and support C Z5 is characterized by gama-alumina through XRD.Adopt fluorescence spectrometry to add the content of metal component, adopt BET determination of nitrogen adsorption pore volume, specific area and can several apertures, the results are shown in table 2.
Embodiment 6
(1) containing metal adds the boehmite of component
According to embodiment 1, in one 2.5 liters retort and stream add 700 ml concns be 96 gram aluminium oxide/liter, wherein contain the aluminum nitrate solution of 3.6 gram ribitol and the ammonia spirit that concentration is 8 weight % and carry out precipitation reaction, reaction temperature is 40 ℃, reaction time is 10 minutes, it is 7 that the flow of control ammonia spirit makes the pH of reaction system, after precipitation reaction finishes, adding in slurries and containing concentration is that to make the pH value of slurries be 8.5 for the ammoniacal liquor of 10 weight % potassium nitrate, slurries filtered after under 55 ℃ aging 60 minutes, filter cake obtains filter cake with deionized water making beating washing 2 times.
Method according to Comparative Examples 1-(1) prepares boehmite, obtains filter cake.
Get two kinds of filter cakes according to 85: 15 ratio of mass fraction and mix, with deionized water making beating washing 2 times, filter cake obtains hydrated alumina P1-6 through 120 ℃ of dryings 24 hours, adopts XRD to characterize, and P1-6 has structure of similar to thin diaspore.Characterizing the n value that calculates P1-6 through XRD lists in the table 1.
(2) containing metal adds the aluminium oxide of component
The mixed solution of 3 gram nitric acid and 120 gram deionized waters is mixed with 200 gram P1-6, mix to pinch at the twin-screw banded extruder afterwards and be plastic, and be extruded into the clover shape bar of 1.2 millimeters of ф, wet bar is through 120 ℃ of dryings after 4 hours, in 600 ℃ of roastings 4 hours, obtain carrier Z6, carrier Z6 is characterized by gama-alumina through XRD.Adopt fluorescence spectrometry to add the content of metal component, adopt BET determination of nitrogen adsorption pore volume, specific area and can several apertures, the results are shown in table 2.
(2) containing metal adds the aluminium oxide of component
Method according to embodiment 1-(2) adopts P2-1 to prepare aluminium oxide, obtains support C Z1, and support C Z1 is characterized by gama-alumina through XRD.Adopt fluorescence spectrometry to add the content of metal component, adopt BET determination of nitrogen adsorption pore volume, specific area and can several apertures, the results are shown in table 2.
Table 1
* the commercial SB powder with Condea company is benchmark, records the degree of crystallinity of each sample.
Table 2
Embodiment 7～12 explanations are by the fischer-tropsch synthetic catalyst that the invention provides the preparation of aluminium oxide shaping carrier.
Z1, Z2, Z3, Z4, Z5 and Z6 carrier with the mixed solution that contains cobalt nitrate and platinum chloride ammonia, are carried out saturated dipping, carry out drying and roasting afterwards, obtain catalyst C1, C2, C3, C4, C5 and C6.Wherein, baking temperature is 120 ℃, and be 6 hours drying time, and sintering temperature is 400 ℃, roasting time 3 hours.The consumption of described cobalt nitrate and platinum chloride ammonia makes that cobalt oxide content is 15 weight % in the final catalyst, and platinum content is 0.1 weight %.
Comparative Examples 6～10
CZ1, CZ2, CZ3, CZ4, CZ5 carrier with the mixed solution that contains cobalt nitrate and platinum chloride ammonia, are carried out saturated dipping, carry out drying and roasting afterwards, obtain catalyst CC1, CC2, CC3, CC4 and CC5.Wherein, baking temperature is 120 ℃, and be 6 hours drying time, and sintering temperature is 400 ℃, roasting time 3 hours.The consumption of described cobalt nitrate and platinum chloride ammonia makes that cobalt oxide content is 15 weight % in the final catalyst, and platinum content is 0.1 weight %.
Embodiment 13-18 explanation the invention provides aluminium oxide and prepares Application of Catalyst and effect thereof.
The Fischer-Tropsch synthesis performance of difference evaluate catalysts C1, C2, C3, C4, C5 and C6 in fixed bed reactors.
Unstripped gas is formed: H
2/ CO/N
2=64%/32%/4% (volume hundred umbers).
The catalyst reduction reaction condition: pressure is normal pressure, and heating rate is 5 ℃/minute, and hydrogen gas space velocity is 600h
-1, reduction temperature is 400 ℃, the recovery time is 5 hours.
Reaction condition: pressure 2.5MPa, 200 ℃ of temperature, synthesis gas (unstripped gas) air speed 2000h
-1
Reaction is carried out getting the gas sample after 24 hours and is carried out chromatography, and wherein, conversion ratio and the methane selectively of COization carbon are listed in table 3.
Comparative Examples 11-15 explanation comparative catalyst performance
According to method difference evaluate catalysts CC1, CC2, CC3, CC4, CC5 and CC6 similarly to Example 13.Wherein, the conversion ratio of COization carbon and methane selectively are listed in table 3.
Table 3
| Embodiment | The sample title | The CO conversion ratio, % | Methane selectively, % |
| 7 | C1 | 38.7％ | 7.0％ |
| Comparative Examples 6 | CC1 | 32.1％ | 10.6％ |
| 8 | C2 | 41.2％ | 7.7％ |
| Comparative Examples 7 | CC2 | 35.5％ | 9.9％ |
| 9 | C3 | 39.4％ | 7.3％ |
| Comparative Examples 8 | CC3 | 34.4％ | 10.0％ |
| 10 | C4 | 40.0％ | 7.5％ |
| Comparative Examples 9 | CC4 | 37.0％ | 9.8％ |
| 11 | C5 | 38.9％ | 7.8％ |
| Comparative Examples 10 | CC5 | 31.0％ | 11.4％ |
| 12 | C6 | 37.0％ | 7.8％ |
As can be seen from Table 3, adopt the aluminium oxide that makes after the boehmite roasting provided by the invention as catalyst carrier, be prepared into the FT synthetic catalyst then, this catalyst has the synthetic performance of better FT under the identical situation of other condition, i.e. higher CO conversion ratio, lower methane selectively.
Claims (8)
1. the boehmite of an alkali metal containing and/or alkaline earth metal component, be benchmark in oxide and with the butt of described boehmite, the content of alkali metal and/or alkaline earth metal component is 0.05-20 weight % in the described boehmite, and described boehmite is the boehmite P1 that comprises at least a 1.1≤n≤2.5; Wherein, n=D (031)/D (120), the crystallite dimension of the crystal face of 031 peak representative in the XRD spectra of described D (031) expression boehmite crystal grain, the crystallite dimension of the crystal face of 120 peak representatives in the XRD spectra of D (120) expression boehmite crystal grain, described 031 peak refers to that 2 θ in the XRD spectra are 34-43 ° peak, described 120 peaks refer to that 2 θ in the XRD spectra are 23-33 ° peak, D=K λ/(Bcos θ), K is the Scherrer constant, λ is the diffraction wavelength of target section bar material, B is the half-peak breadth of diffraction maximum, and 2 θ are the position of diffraction maximum.
2. boehmite according to claim 1 is characterized in that, described P1 is the boehmite of 1.2≤n≤2.2; Described alkali metal is selected from Li, K and combination thereof, described alkaline-earth metal is selected from one or more among Mg, Ca, Sr and the Ba, be benchmark in oxide and with the butt of described boehmite, the content of alkali metal and/or alkaline earth metal component is 1-10 weight % in the described boehmite.
3. boehmite according to claim 1 is characterized in that, described boehmite comprises the boehmite P2 of 0.8＜n＜1.1, is benchmark with described boehmite total amount, and the content of described P2 is not more than 50 weight %.
4. boehmite according to claim 3 is characterized in that, described P2 is the boehmite of 0.85≤n≤1.05, is benchmark with described boehmite total amount, and the content of described P2 is not more than 30 weight %.
5. aluminium oxide, this aluminium oxide is obtained by the boehmite roasting, it is characterized in that, and described boehmite is the boehmite of any described alkali metal containing and/or alkaline earth metal component among the claim 1-4.
6. aluminium oxide according to claim 5 is characterized in that, described aluminium oxide is gama-alumina.
7. according to claim 5 or 6 described aluminium oxide, it is characterized in that described roasting condition comprises: sintering temperature is 350-950 ℃, and roasting time is 1-12 hour.
8. aluminium oxide according to claim 7 is characterized in that, described roasting condition comprises: sintering temperature is 450-900 ℃, and roasting time is 2-8 hour.
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