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CN102764668A - Preparation of phosphomolybdate catalyst loaded on gamma-Al2O3 - Google Patents

Preparation of phosphomolybdate catalyst loaded on gamma-Al2O3 Download PDF

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Publication number
CN102764668A
CN102764668A CN2011101164645A CN201110116464A CN102764668A CN 102764668 A CN102764668 A CN 102764668A CN 2011101164645 A CN2011101164645 A CN 2011101164645A CN 201110116464 A CN201110116464 A CN 201110116464A CN 102764668 A CN102764668 A CN 102764668A
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Prior art keywords
catalyst
solution
rare earth
acid
need
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CN2011101164645A
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于海斌
王震宇
马铁剑
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TIANJIN SHENNENG SCIENCE AND TECHNOLOGY Co Ltd
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TIANJIN SHENNENG SCIENCE AND TECHNOLOGY Co Ltd
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Abstract

The invention relates to synthesis of a novel catalyst, especially to a catalyst of various phosphomolybdates, the catalyst being loaded on gamma-Al2O3. The catalyst has a function of improving rare earth, can be used to substantially raise stability and catalytic activity and minimize environmental pollution, and is a novel environmentally friendly catalyst material. The preparation comprises the following concrete steps of: mixing phosphatic with simple inorganic acid salts of molybdate and the like according to a certain ratio for acidification, filtering for liquid separation, extracting an ether acid mixed liquor to prepare phospho molybdic acid, mixing phospho molybdic acid, different salts (such as sodium salt, sylvite, quaternary ammonium salt and the like), a rare earth nitrate solution and the gamma-Al2O3 carrier, filtering, washing and drying to prepare the required catalyst. The catalyst provided by the invention is mainly applied in the catalytic hydrogenation link in the petroleum industry, and can be used to greatly raise oil quality.

Description

A kind of γ-Al that loads on 2O 3On the phosphomolybdate Preparation of catalysts
Technical field
The present invention relates to a kind of environmentally friendly heteropolyacid salt catalytic hydrogenation material, particularly load on γ-Al 2O 3On the phosphomolybdate Preparation of catalysts, belong to the synthetic field of inorganic material.
Background technology
Phosphomolybdic acid is a kind of heteropoly acid.As solid acid catalyst, its intensity is higher than common inorganic acid far away to heteropoly acid (being called for short HPA), receives the extensive attention of catalytic field in the past over more than 20 year always.Heteropoly acid is the one type of multinuclear complex acid that is passed through the oxygen atom ligand bridging by central atom (hetero atom) and ligand (polyatom).Can be divided into five types of Keggin, Silverton, Daw-son, Waugh, Anderson by its cloudy atomic structure.Heteropoly acid has unique " accurate liquid phase " behavior; It has the same cage structure of zeolite, between the heteropolyacid anions of body in mutually certain gap is arranged, the body that some less polar molecule (like water, alcohol, ammonia, pyridine etc.) can get into heteropoly acid mutually in; Change on the solid heteropoly acid surface; Promptly extend to body mutually in everywhere, thereby in its body, form false liquid phase, so solid heteropoly acid has the characteristics of homogeneous catalytic reaction.This surface type of heteropoly acid and the body existence of (accurate liquid phase) catalytic action mutually do not occur over just on the surface of catalyst its catalytic reaction, and occur in the body phase of whole catalyst, thereby have higher catalytic activity and selectivity.The multi-functional in addition advantages such as (highly acid, strong oxidizing property, inhibition, photoelectrocatalysis) of heteropoly acid.
Because heteropoly acid catalysis reclaims difficulty, and has certain pollution and etching apparatus problem, and the less (<10m of the specific area of heteropoly acid 2/ g), be unfavorable for giving full play to catalytic activity, its application aspect catalysis is restricted.The heteropoly acid pay(useful) load can be improved its surface area greatly on suitable carriers, can not only improve its catalytic activity and selectivity, and can also make the homogeneous catalytic reaction variation; Product is easily separated; Catalyst is prone to reclaim, and has simplified production technology, thereby has opened up the new world of catalytic field.
Say that in principle any solid matter can be as the carrier of heteropoly acid.Mainly contained active carbon, SiO by broad research and used carrier at present 2, Al 2O 3, MCM-41 molecular sieve, TiO 2, large pore material such as diatomite (DE), bentonite and ion exchange resin.The preparation method of carried heteropoly acid mainly contains infusion process, absorption method, sol-gel process and hydro-thermal dispersion method etc.And γ-Al 2O 3(γ-aluminum oxide) has the big and big characteristic of porosity of specific area as one type of porous aluminium oxide solid, and strong adsorption capacity and catalytic activity are arranged, and is the fine selection of carrier.
Summary of the invention
The object of the present invention is to provide a kind of preparation method of environmentally friendly phosphomolybdate catalyst material of high catalytic performance.Adopt simple immersion process for preparing to go out to load on γ-Al 2O 3On, and handle through certain rare earth, have highly active, the phosphomolybdate catalyst.
Concrete concrete grammar is following: under normal pressure and water-bath heating, stir the Na of certain proportioning 2MoO 4Solution and Na 2HPO 4Solution, be heated to 90 ℃ after, regulate between the pH scope 1~3 through dripping HCl solution, filter while hot after the backflow.To filtrate then through two hypo acid ether mixed liquors, extraction, separatory, and it is dry to put into drier.The phosphomolybdic acid that makes is made multiple phosphomolybdate through metathesis reaction.With phosphomolybdate and a certain amount of γ-Al 2O 3Carrier adds the rare earth salpeter solution, and constant temperature stirs under the uniform temperature, and is behind filtration and the recrystallization that sample is dry down at 60 ℃ after leaving standstill.
The specific embodiment
Instance 1
In there-necked flask, add 50ml Na 2MoO 4(0.12mmol) solution stirs adding 25mlNa down 2HPO 4(0.01mmol) solution, water-bath are heated to 90 ℃.Hydrochloric acid 25ml with constant pressure funnel dropping 4mol/L regulates pH to 1~3, and the 1~4h that refluxes stops to filter while hot after the heating, and filtrating is cooled to room temperature, moves into separatory funnel, adds the 30ml absolute ether, dropwise adds 15mlv (H 2O): v (concentrated sulfuric acid)=1: 1, fully vibration, standing demix, layer oily matter is the heteropoly acid etherate, utilizes moving air to dry up ether, and product is dissolved in the distilled water, puts into vacuum desiccator, separates out the buff crystal, in 80 ℃ of drying for standby.Utilize ion exchange, with the K of the phosphomolybdic acid that makes with certain metering 2CO 3The reaction, phosphomolybdic acid sylvite, through with rare earth nitrate solution and γ-Al 2O 3The carrier hybrid infusion, washing and filtering is also dry.
Instance 2
In there-necked flask, add 50ml Na 2MoO 4(0.12mmol) solution stirs adding 25ml Na down 2HPO 4(0.011mmol) solution, water-bath are heated to 90 ℃.Hydrochloric acid 25ml with constant pressure funnel dropping 4mol/L regulates pH to 1~3, and the 1~4h that refluxes stops to filter while hot after the heating, and filtrating is cooled to room temperature, moves into separatory funnel, adds the 30ml absolute ether, dropwise adds 15mlv (H 2O): v (concentrated sulfuric acid)=1: 1, fully vibration, standing demix, layer oily matter is the heteropoly acid etherate, utilizes moving air to dry up ether, and product is dissolved in the distilled water, puts into vacuum desiccator, separates out the buff crystal, in 80 ℃ of drying for standby.Utilize ion exchange, with the Na of the phosphomolybdic acid that makes with certain metering 2CO 3The reaction, the phosphomolybdic acid sodium salt, through with rare earth nitrate solution and γ-Al 2O 3The carrier hybrid infusion, washing and filtering is also dry.
Instance 3
In there-necked flask, add 50ml Na 2MoO 4(0.12mmol) solution stirs adding 25ml Na down 2HPO 4(0.011mmol) solution, water-bath are heated to 90 ℃.Hydrochloric acid 25ml with constant pressure funnel dropping 4mol/L regulates pH to 1~3, and the 1~4h that refluxes stops to filter while hot after the heating, and filtrating is cooled to room temperature, moves into separatory funnel, adds the 30ml absolute ether, dropwise adds 15mlv (H 2O): v (concentrated sulfuric acid)=1: 1, fully vibration, standing demix, layer oily matter is the heteropoly acid etherate, utilizes moving air to dry up ether, and product is dissolved in the distilled water, puts into vacuum desiccator, separates out the buff crystal, in 80 ℃ of drying for standby.Utilize ion exchange, make four kinds of phosphomolybdic acid quaternary ammonium salts with tetramethyl ammonium chloride, DTAC, hexadecyltrimethylammonium chloride, OTAC through metathesis reaction respectively, through with rare earth nitrate solution and γ-Al 2O 3The carrier hybrid infusion, washing and filtering is also dry.
Instance 4
In there-necked flask, add 50ml Na 2MoO 4(0.12mmol) solution stirs adding 25ml Na down 2HPO 4(0.011mmol) solution, water-bath are heated to 90 ℃.Hydrochloric acid 25ml with constant pressure funnel dropping 4mol/L regulates pH to 1~3, and the 1~4h that refluxes stops to filter while hot after the heating, and filtrating is cooled to room temperature, moves into separatory funnel, adds the 30ml absolute ether, dropwise adds 15mlv (H 2O): v (concentrated sulfuric acid)=1: 1, fully vibration, standing demix, layer oily matter is the heteropoly acid etherate, utilizes moving air to dry up ether, and product is dissolved in the distilled water, puts into vacuum desiccator, separates out the buff crystal, in 80 ℃ of drying for standby.With phosphomolybdic acid through with rare earth nitrate solution and γ-Al 2O 3The carrier hybrid infusion, washing and filtering is also dry.

Claims (10)

1. that novel phosphomolybdate Preparation of catalysts, characteristics are that carrier selects for use is γ-Al 2O 3, and utilized rare earth modifiedly, improved the stability of catalyst, heat endurance and catalytic reaction activity etc.
2. said according to claim 1, its characteristics are that the carrier of selecting for use is the high γ-Al of specific area 2O 3, it is big to have a hole, characteristics such as strong adsorption capacity and catalytic activity.
3. said according to claim 1, its characteristics are to have dripped nitrate of rare earth element solution in carrier and the phosphomolybdate catalyst solution dipping process; Through regulating pH to 5~6; Filter recrystallization, the phosphomolybdate catalyst of the rare earth element that obtained mixing.
4. said according to claim 2, need prepare and have higher specific surface area (800~1300m 2/ g), the γ-Al of higher heat endurance (800 ℃ down stable) and certain hydrothermal stability 2O 3
5. said according to claim 3, preparation phosphomolybdate catalyst need be with phosphorus molybdenum acid solution and sodium salt, sylvite, and quaternary ammonium salts etc. make through ion exchange, need certain stoichiometric proportion, according to the equation proportioning.
6. said according to claim 5, the preparation phosphomolybdic acid need mix acidifying according to proportioning with simple inorganic acid, leaves standstill separatory after the stirring, behind the extraction lower floor solution, and vacuum drying.
7. said according to claim 6, inorganic acid need adopt Na 2MoO 4With Na 2HPO 4Solution.
8. said according to claim 6, need hydrochloric acid solution acidifying with 4mol/L.
9. said according to claim 6, utilize ether, the sour ether mixed liquor extraction of sulfuric acid, be specially add the 30mL absolute ether after, dropwise add 15ml v (H 2O): v (concentrated sulfuric acid)=1: 1, fully vibration, standing demix.
10. said according to claim 3, the nitrate solution of rare earth, employing be cerous nitrate, lanthanum nitrate and praseodymium nitrate solution (mass fraction of rare earth nitrades is 0.02%).
CN2011101164645A 2011-05-06 2011-05-06 Preparation of phosphomolybdate catalyst loaded on gamma-Al2O3 Pending CN102764668A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104084232A (en) * 2014-06-18 2014-10-08 浙江工业大学 Preparation method for catalyst used for deoxidation of biological fatty alcohol
CN108126751A (en) * 2017-12-27 2018-06-08 中海油天津化工研究设计院有限公司 Molecular sieve supported heteropoly acid alkylating and desulfurizing catalyst of multi-stage porous and preparation method thereof
CN108772100A (en) * 2018-05-22 2018-11-09 广东工业大学 A kind of heteropolyacid salt solid catalyst and its preparation method and application
WO2019109213A1 (en) * 2017-12-04 2019-06-13 天津大学 Al2o3 particles synergistically modified by rare-earth metal and phosphorus, and preparation method therefor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1668770A (en) * 2002-07-08 2005-09-14 英格哈得公司 removal of metal compounds
CN1792446A (en) * 2005-12-21 2006-06-28 中国科学院山西煤炭化学研究所 Catalyst, Preparation Method and Application of Synthesis of Methylal by Oxidation of Dimethyl Ether
CN101152630A (en) * 2006-07-24 2008-04-02 Ifp公司 Process for the preparation of at least one cobalt and/or nickel salt of at least one heteropolyanion

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1668770A (en) * 2002-07-08 2005-09-14 英格哈得公司 removal of metal compounds
CN1792446A (en) * 2005-12-21 2006-06-28 中国科学院山西煤炭化学研究所 Catalyst, Preparation Method and Application of Synthesis of Methylal by Oxidation of Dimethyl Ether
CN101152630A (en) * 2006-07-24 2008-04-02 Ifp公司 Process for the preparation of at least one cobalt and/or nickel salt of at least one heteropolyanion

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104084232A (en) * 2014-06-18 2014-10-08 浙江工业大学 Preparation method for catalyst used for deoxidation of biological fatty alcohol
CN104084232B (en) * 2014-06-18 2016-03-02 浙江工业大学 A kind of preparation method of catalyst of biological fatty alcohol deoxidation
WO2019109213A1 (en) * 2017-12-04 2019-06-13 天津大学 Al2o3 particles synergistically modified by rare-earth metal and phosphorus, and preparation method therefor
CN108126751A (en) * 2017-12-27 2018-06-08 中海油天津化工研究设计院有限公司 Molecular sieve supported heteropoly acid alkylating and desulfurizing catalyst of multi-stage porous and preparation method thereof
CN108126751B (en) * 2017-12-27 2020-11-24 中海油天津化工研究设计院有限公司 Multi-stage pore molecular sieve supported heteropoly acid alkylation desulfurization catalyst and preparation method thereof
CN108772100A (en) * 2018-05-22 2018-11-09 广东工业大学 A kind of heteropolyacid salt solid catalyst and its preparation method and application
CN108772100B (en) * 2018-05-22 2021-04-16 广东工业大学 A kind of heteropolyacid salt solid catalyst and its preparation method and application

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Application publication date: 20121107