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CN109794250A - Hydrogen synthesis catalyst and preparation method thereof - Google Patents

Hydrogen synthesis catalyst and preparation method thereof Download PDF

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Publication number
CN109794250A
CN109794250A CN201811647577.6A CN201811647577A CN109794250A CN 109794250 A CN109794250 A CN 109794250A CN 201811647577 A CN201811647577 A CN 201811647577A CN 109794250 A CN109794250 A CN 109794250A
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synthesis catalyst
hydrogen synthesis
hydrogen
preparation
catalyst
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Chinese (zh)
Inventor
邱国华
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Guangdong Fuhai New Energy Technology Co ltd
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Guangdong Fuhai New Energy Technology Co ltd
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Abstract

The invention relates to the technical field of methanol hydrogen production, in particular to a hydrogen synthesis catalyst and a preparation method thereof, and the hydrogen synthesis catalyst comprises the following steps: (1) adding copper nitrate and basic zinc carbonate into deionized water, gradually adding a sodium carbonate solution under ultrasonic oscillation, adjusting the pH value, ending the oscillation, aging, and filtering to obtain a precipitate; (2) and washing the precipitate, adding lanthanum oxide, performing ball milling dispersion, and then washing, drying and roasting to obtain the hydrogen synthesis catalyst. By combining the one-step reverse precipitation method and the ultrasonic oscillation technology, copper carbonate precipitates with smaller particle size and larger specific surface area can be generated in the ultrasonic oscillation process and are easy to attach to basic zinc carbonate, and compared with a common one-step precipitation method or a two-step precipitation method, the prepared catalyst has higher specific surface area and Cu dispersity; in addition, lanthanum oxide is mixed in the precipitate, so that the stability of the catalyst and the hydrogen production rate can be improved.

Description

A kind of hydrogen synthetic catalyst and preparation method thereof
Technical field
The present invention relates to Technology for Production Hydrogen from Methanol fields, and in particular to a kind of hydrogen synthetic catalyst and preparation method thereof.
Background technique
Hydrogen is as ideal chemical fuel, energy carrier and energy storage tool, rich reserves on earth, combustion heat value Height, and do not generate any pollution after burning, is conducive to environmental protection, therefore is counted as 21 century ideal clean new energy.
In all too many levels of hydrogen manufacturing key technology it may first have to solve the Discussion On Development of effective catalyst.No matter from technology Maturity or from existing infrastructure using from the point of view of degree, with fossil fuel (including methanol, natural gas, vapour Oil, diesel oil etc.) hydrogen manufacturing is the important channel for solving small-scale distributing hydrogen source at this stage.Liquid fuel carbinol is due to hydrogen manufacturing The features such as conversion condition (temperature, pressure, volume, quality) is relatively mild, sulfur-bearing, low toxicity, hydrogen production process are not realized relatively easily As the first choice in these hydrogen-rich fuels.
Currently, the report that copper-based catalysts are applied to methanol steam reforming reaction is more, number of patent application is 201810320327.5 patent of invention discloses the catalyst of CuO/ZnO/ScO a kind of, which has methanol conversion high The characteristics of, but have no and illustrate for the stability and hydrogen yield of catalyst.
Summary of the invention
In order to overcome shortcoming and defect existing in the prior art, the purpose of the present invention is to provide a kind of methanol conversions High, stable and high hydrogen yield hydrogen synthetic catalyst and preparation method thereof.
The purpose of the invention is achieved by the following technical solution:
A kind of preparation method of hydrogen synthetic catalyst, includes the following steps:
(1) basic zinc carbonate of the copper nitrate and 36-40 parts by weight that take 3-6 parts by weight is added to 100 parts by weight deionizations In water, under ultrasonic vibration, it is gradually added into sodium carbonate liquor, adjusting pH value is 7.5-8.5, terminates concussion, is aged, and filtering obtains To precipitating;
(2) precipitating is washed, 0.5-1 parts by weight lanthana is added and carries out ball milling dispersion, then washed, done It is dry, roasting to get arrive the hydrogen synthetic catalyst.
The present invention utilizes the combination of a step reverse-precipitation and ultrasonic vibration technique, during ultrasonic vibration, can be generated The bigger copper carbonate precipitating of partial size more small specific surface product, and be easy to be attached on basic zinc carbonate, relative to a common step The precipitation method or two precipitation method, catalyst obtained have higher specific surface area and Cu dispersion degree;In addition, the present invention is also heavy It is mixed into lanthana in shallow lake, the stability and hydrogen-producing speed of catalyst can be promoted.
Wherein, the ultrasonic frequency of the ultrasonic vibration is 20-40kHz, ultrasonic power 20-30W.Ultrasonic wave generates Cavitation effect can promote the uniform generation of the evenly dispersed of basic zinc carbonate and precipitating, but supersonic frequency or power mistake Height, cavitation effect excessively can acutely make precipitating be not easy to be attached on basic zinc carbonate instead, reduce the dispersion degree of Cu, thus super The ultrasonic frequency that acoustic shock is swung is 20-40kHz, ultrasonic power 20-30W.
Wherein, in the step (1), it is 60-70 DEG C that the temperature of solution is kept while ultrasonic vibration.Keep suitable temperature Degree is conducive to improve the specific surface area of catalyst, and when temperature is 50 DEG C or 80 DEG C, the specific surface area of catalyst is not achieved 46.5m2/g。
Wherein, the digestion time is 40-80min.By control digestion time, sediment recurring structure is promoted to reset, The catalyst prepared by has higher specific surface area and catalytic activity.
Wherein, the partial size of the basic zinc carbonate is 120-180nm, and the partial size of lanthana is 200-300nm.Basic carbonate When the partial size of zinc is lower than 120nm, it can still find that part is reunited under the ultrasound condition of 20-40kHz and 20-30W of the invention Phenomenon, partial size are higher than 180nm, are unfavorable for being deposited in the uniform attachment on basic zinc carbonate;And pass through the partial size of control lanthana Its dispersibility can be promoted.
Wherein, the concentration of the sodium carbonate liquor is 1.0-2.0mol/L.The concentration of sodium carbonate liquor lower than 1mol/L or Higher than 2mol/L, it is unfavorable for the control of pH, and is easy residual sodium ion in catalyst, reduces the catalytic activity of catalyst and steady It is qualitative.
Wherein, the temperature of the drying is 80-120 DEG C.
Wherein, the maturing temperature is 340-360 DEG C, calcining time 2-3h.When by control maturing temperature and roasting Between the catalyst of available large specific surface area and uniform component distribution, enhance copper zinc between interaction, promoted hydrogen produce Rate.
The hydrogen synthetic catalyst specific surface area as made from method as above is 81.3-89.6m2The dispersion degree of/g, Cu is 12.1-13.8%.
The beneficial effects of the present invention are: the present invention utilizes the combination of a step reverse-precipitation and ultrasonic vibration technique, surpasses During acoustic shock is swung, the bigger copper carbonate precipitating of partial size more small specific surface product can be generated, and be easy to be attached to basic carbonate On zinc, relative to common a step precipitation method or two precipitation method, catalyst obtained has higher specific surface area and Cu points Divergence;In addition, the present invention is also mixed into lanthana in precipitating, the stability and hydrogen-producing speed of catalyst can be promoted.
Detailed description of the invention
Fig. 1 be the hydrogen synthetic catalyst of embodiment 1 for hydrogen from methyl alcohol when methanol conversion-temperature profile.
Specific embodiment
For the ease of the understanding of those skilled in the art, make below with reference to 1 couple of present invention of examples and drawings further Illustrate, the content that embodiment refers to not is limitation of the invention.
Embodiment 1
A kind of preparation method of hydrogen synthetic catalyst, includes the following steps:
(1) basic zinc carbonate of the copper nitrate and 38g that take 4.5g is added into 100g deionized water, under ultrasonic vibration, It is gradually added into sodium carbonate liquor, adjusting pH value is 8, terminates concussion, is aged, and filtering is precipitated;
(2) precipitating is washed, 0.7g lanthana is added and carries out ball milling dispersion, is then washed, dried, roasted, Obtain the hydrogen synthetic catalyst.
Wherein, the ultrasonic frequency of the ultrasonic vibration is 30kHz, ultrasonic power 25W
Wherein, in the step (1), it is 65 DEG C that the temperature of solution is kept while ultrasonic vibration.
Wherein, the digestion time is 60min.
Wherein, the partial size of the basic zinc carbonate is 150nm, and the partial size of lanthana is 250nm.
Wherein, the concentration of the sodium carbonate liquor is 1.5mol/L.
Wherein, the temperature of the drying is 100 DEG C.
Wherein, the maturing temperature is 350 DEG C, calcining time 2.5h.
The hydrogen synthetic catalyst specific surface area as made from method as above is 89.6m2The dispersion degree of/g, Cu are 13.8%.
Catalyst is crushed, after taking 8-10 mesh 2.5g to be packed into reactor, (30ml/min) is risen in a nitrogen atmosphere Reaction temperature after temperature arrives, starts charging and reacts, the methanol conversion (result is as shown in Figure 1) of test reaction, at 350 DEG C, Alcohol conversion reaches 98.6%, and measuring the hydrogen content produced in gas is 75.8%.
Embodiment 2
A kind of preparation method of hydrogen synthetic catalyst, includes the following steps:
(1) basic zinc carbonate of the copper nitrate and 36g that take 3g is added into 100g deionized water, under ultrasonic vibration, by Sodium carbonate liquor is gradually added, adjusting pH value is 7.5, terminates concussion, is aged, and filtering is precipitated;
(2) precipitating is washed, 0.5g lanthana is added and carries out ball milling dispersion, is then washed, dried, roasted, Obtain the hydrogen synthetic catalyst.
Wherein, the ultrasonic frequency of the ultrasonic vibration is 20kHz, ultrasonic power 20W
Wherein, in the step (1), it is 60 DEG C that the temperature of solution is kept while ultrasonic vibration.
Wherein, the digestion time is 40min.
Wherein, the partial size of the basic zinc carbonate is 120nm, and the partial size of lanthana is 200nm.
Wherein, the concentration of the sodium carbonate liquor is 1.0mol/L.
Wherein, the temperature of the drying is 80 DEG C.
Wherein, the maturing temperature is 340 DEG C, calcining time 2h.
The hydrogen synthetic catalyst specific surface area as made from method as above is 81.3m2The dispersion degree of/g, Cu are 12.1%.
Embodiment 3
A kind of preparation method of hydrogen synthetic catalyst, includes the following steps:
(1) basic zinc carbonate of the copper nitrate and 40g that take 6g is added into 100g deionized water, under ultrasonic vibration, by Sodium carbonate liquor is gradually added, adjusting pH value is 8.5, terminates concussion, is aged, and filtering is precipitated;
(2) precipitating is washed, 1g lanthana is added and carries out ball milling dispersion, is then washed, dried, roasted, i.e., Obtain the hydrogen synthetic catalyst.
Wherein, the ultrasonic frequency of the ultrasonic vibration is 40kHz, ultrasonic power 30W
Wherein, in the step (1), it is 70 DEG C that the temperature of solution is kept while ultrasonic vibration.
Wherein, the digestion time is 80min.
Wherein, the partial size of the basic zinc carbonate is 180nm, and the partial size of lanthana is 300nm.
Wherein, the concentration of the sodium carbonate liquor is 2.0mol/L.
Wherein, the temperature of the drying is 120 DEG C.
Wherein, the maturing temperature is 360 DEG C, calcining time 3h.
The hydrogen synthetic catalyst specific surface area as made from method as above is 84.4m2The dispersion degree of/g, Cu are 12.8%.
Comparative example 1
This comparative example the difference from embodiment 1 is that: the preparation method of catalyst includes the following steps:
(1) zinc nitrate of the copper nitrate and 16g that take 4.5g is added into 100g deionized water, under ultrasonic vibration, gradually Sodium carbonate liquor is added, adjusting pH value is 8, terminates concussion, is aged, and filtering is precipitated;
(2) precipitating is washed, 0.7g lanthana is added and carries out ball milling dispersion, is then washed, dried, roasted, Obtain the catalyst.
The hydrogen synthetic catalyst specific surface area as made from method as above is 45.3m2The dispersion degree of/g, Cu are 7.4%.
Comparative example 2
This comparative example the difference from embodiment 1 is that: in step (1) without use ultrasonic vibration.
The hydrogen synthetic catalyst specific surface area as made from method as above is 48.1m2The dispersion degree of/g, Cu are 9.1%.
Above-described embodiment is the preferable implementation of the present invention, and in addition to this, the present invention can be realized with other way, Do not depart under the premise of present inventive concept it is any obviously replace it is within the scope of the present invention.

Claims (10)

1.一种氢合成催化剂的制备方法,其特征在于:包括如下步骤:1. a preparation method of a hydrogen synthesis catalyst, is characterized in that: comprise the steps: (1)取3-6重量份的硝酸铜和36-40重量份的碱式碳酸锌加入至100重量份去离子水中,在超声震荡下,逐渐加入碳酸钠溶液,调节pH值为7.5-8.5,结束震荡,陈化,过滤,得到沉淀;(1) get the copper nitrate of 3-6 weight parts and the basic zinc carbonate of 36-40 weight parts and add to 100 weight parts of deionized water, under ultrasonic vibration, gradually add sodium carbonate solution, adjust pH value to be 7.5-8.5 , end the shock, age, filter, and get the precipitation; (2)将沉淀进行洗涤,加入0.5-1重量份氧化镧进行球磨分散,然后进行洗涤、干燥、焙烧,即得到所述氢合成催化剂。(2) washing the precipitate, adding 0.5-1 part by weight of lanthanum oxide for ball milling and dispersion, then washing, drying and calcining to obtain the hydrogen synthesis catalyst. 2.根据权利要求1所述的一种氢合成催化剂的制备方法,其特征在于:所述超声震荡的超声波频率为20-40kHz,超声波功率为20-30W。2. The preparation method of a hydrogen synthesis catalyst according to claim 1, wherein the ultrasonic frequency of the ultrasonic oscillation is 20-40kHz, and the ultrasonic power is 20-30W. 3.根据权利要求1所述的一种氢合成催化剂的制备方法,其特征在于:所述步骤(1)中,超声震荡的同时保持溶液的温度为60-70℃。3 . The method for preparing a hydrogen synthesis catalyst according to claim 1 , wherein in the step (1), the temperature of the solution is kept at 60-70° C. while ultrasonically oscillating. 4 . 4.根据权利要求1所述的一种氢合成催化剂的制备方法,其特征在于:所述陈化时间为40-80min。4. the preparation method of a kind of hydrogen synthesis catalyst according to claim 1, is characterized in that: described aging time is 40-80min. 5.根据权利要求1所述的一种氢合成催化剂的制备方法,其特征在于:所述碱式碳酸锌的粒径为120-180nm,氧化镧的粒径为200-300nm。5 . The method for preparing a hydrogen synthesis catalyst according to claim 1 , wherein the particle size of the basic zinc carbonate is 120-180 nm, and the particle size of the lanthanum oxide is 200-300 nm. 6 . 6.根据权利要求1所述的一种氢合成催化剂的制备方法,其特征在于:所述碳酸钠溶液的浓度为1.0-2.0mol/L。6. the preparation method of a kind of hydrogen synthesis catalyst according to claim 1, is characterized in that: the concentration of described sodium carbonate solution is 1.0-2.0mol/L. 7.根据权利要求1所述的一种氢合成催化剂的制备方法,其特征在于:所述干燥的温度为80-120℃。7 . The method for preparing a hydrogen synthesis catalyst according to claim 1 , wherein the drying temperature is 80-120° C. 8 . 8.根据权利要求1所述的一种氢合成催化剂的制备方法,其特征在于:所述焙烧温度为340-360℃,焙烧时间为2-3h。8 . The method for preparing a hydrogen synthesis catalyst according to claim 1 , wherein the roasting temperature is 340-360° C., and the roasting time is 2-3h. 9 . 9.一种氢合成催化剂,其特征在于:由权利要求1-8任意一项所述的氢合成催化剂的制备方法制得。9. A hydrogen synthesis catalyst, characterized in that: it is prepared by the preparation method of the hydrogen synthesis catalyst according to any one of claims 1-8. 10.权利要求9所述的氢合成催化剂,其特征在于:比表面积为81.3-89.6m2/g,Cu的分散度为12.1-13.8%。10 . The hydrogen synthesis catalyst of claim 9 , wherein the specific surface area is 81.3-89.6 m 2 /g, and the Cu dispersion is 12.1-13.8%. 11 .
CN201811647577.6A 2018-12-29 2018-12-29 Hydrogen synthesis catalyst and preparation method thereof Pending CN109794250A (en)

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