CN104368345A - Preparation method and catalytic application of supported type high-dispersion nickel-based alloy catalyst - Google Patents

Preparation method and catalytic application of supported type high-dispersion nickel-based alloy catalyst Download PDF

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CN104368345A
CN104368345A CN201410670739.3A CN201410670739A CN104368345A CN 104368345 A CN104368345 A CN 104368345A CN 201410670739 A CN201410670739 A CN 201410670739A CN 104368345 A CN104368345 A CN 104368345A
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type high
catalyst
alloy catalyst
preparation
support type
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张法智
项建峰
闻鑫
杨志祥
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Beijing University of Chemical Technology
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Beijing University of Chemical Technology
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Priority to PCT/CN2015/074238 priority patent/WO2016078261A1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J21/00Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
    • B01J21/02Boron or aluminium; Oxides or hydroxides thereof
    • B01J21/04Alumina
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/70Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
    • B01J23/74Iron group metals
    • B01J23/755Nickel
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/70Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
    • B01J23/76Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/80Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with zinc, cadmium or mercury
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/70Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
    • B01J23/76Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/84Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • B01J23/85Chromium, molybdenum or tungsten
    • B01J23/86Chromium
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10GCRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G45/00Refining of hydrocarbon oils using hydrogen or hydrogen-generating compounds
    • C10G45/44Hydrogenation of the aromatic hydrocarbons
    • C10G45/46Hydrogenation of the aromatic hydrocarbons characterised by the catalyst used
    • C10G45/48Hydrogenation of the aromatic hydrocarbons characterised by the catalyst used containing nickel or cobalt metal, or compounds thereof

Abstract

The invention discloses a preparation method and a catalytic application of a supported type high-dispersion nickel-based alloy catalyst. The preparation method comprises the following steps: by virtue of an in-situ growth method, supporting Ni, M (M=Co, Zn, Cu, Fe, Cr and the like) metal in the form of hydrotalcite on the surface of a microsphere-form gamma-Al2O3 carrier with grain size of 20-40 meshes and in a duct of the microsphere-form gamma-Al2O3 carrier, namely growing lamellar precursor LDHs containing Ni and M metal ions outside and inside a Al2O3 particle to form supported type high-dispersion distribution, converting the lamellar precursor LDHs into a corresponding composite metal oxide by drying and roasting at high temperature, and reducing the composite metal oxide to obtain the supported type high-dispersion nickel-based alloy catalyst with NiM distributed on the outer surface and in the duct of the carrier particle. The supported type high-dispersion nickel-based alloy catalyst is applied to first selective hydrogenation reaction of cracked gasoline, so that the conversion rate, the selectivity and the stability of the catalyst can be effectively improved; and moreover, the supported type high-dispersion nickel-based alloy catalyst can be used for methane reforming, and catalyzing reaction of preparing low-carbon hydrocarbon and alcohol by virtue of CO and CO2 hydrogenation.

Description

A kind of preparation method of support type high-dispersed nickel alloy catalyst and catalytic applications thereof
Technical field
The invention belongs to catalyst preparation technical field, particularly a kind of to utilize in situ synthesis to prepare be the support type high-dispersed nickel alloy catalyst of carrier and the application in drippolene one section of selec-tive hydrogenation field thereof with aluminium oxide.
Background technology
Drippolene is the valuable accessory substance of one of industrial high temperature naphtha thermal cracking ethene and propylene, accounts for 50% ~ 80% of ethylene yield, its C 5 +~ C 12 +hydro carbons is main component, wherein containing a large amount of aromatic hydrocarbons (40 ~ 80%, benzene,toluene,xylene), alkadienes, alkene and alkane, and the therefore high-octane gasoline blending oil of drippolene Chang Zuowei or the raw material of triphen extracting.But its poor stability, needs the styrene of commute formation colloid and carbon distribution and alkadienes to utilize load type metal catalyst to carry out selective hydrogenation at a lower temperature and generates corresponding ethylo benzene and monoene.At present, conventional catalyst is aluminium oxide is the Ni-based of carrier or palladium-based catalyst.Compare palladium-based catalyst, nickel-base catalyst because of its cheap, antitoxin anticol matter is good and to hydro carbons be applicable to hydrogenation/hydrogenolysis performance and be subject to extensive concern.In selective hydrogenation of cracked gasoline reaction, the catalytic performance of nickel-base catalyst utilizes interpolation auxiliary agent usually, modified catalyst carrier and introduce the modes such as novel prevulcanized process and improve.In the middle of these methods, load type bimetal catalyst has been proved to be and effectively can have improved catalytic performance relative to single-metal reforming catalyst.Bimetallic catalyst can show excellent physics and chemical property in conjunction with confinement effect and alloy effect.Especially, bimetallic catalyst can easily by regulating component composition and atomic arrangement to carry out its catalytic performance of modulation.
LDHs is the compound formed by interlayer anion and positively charged laminate ordered fabrication, and its chemical composition general formula is generally as follows: [M 2+ 1-xm 3+ x(OH) 2] x+[A n-] x/nyH 2o, wherein M 2+and M 3+be respectively divalence and trivalent metal cation, be positioned on main body laminate; A n-for interlayer anion; X is M 3+/ (M 2++ M 3+) molar ratio; Y is the number of intermediary water molecule.Form the design feature such as the adjustable sex change in space, the adjustable sex change of host-guest interaction in adjustable sex change, main body laminate charge density and the adjustable sex change that distributes thereof, intercalant anion guest species and the adjustable sex change of quantity, layer because LDHs has body layer sheetmetal ion, such that LDHs is our Development of Novel catalyst, the catalyst carrier of catalyst precarsor and adjustable structure changes and character provides platform highly significant.
Summary of the invention
The object of this invention is to provide a kind of simple preparation support type high-dispersed nickel alloy catalyst method and by this catalyst application in drippolene one section of selec-tive hydrogenation.
The present invention by situ synthesis by Ni, M (M=Co, Zn, Cu, Fe, Cr etc.) metal with the form load of houghite at particle diameter for 20-40 object microspheroidal γ-Al 2o 3in carrier surface and duct thereof, namely at Al 2o 3extra-granular and growth inside contain the stratiform presoma LDHs of Ni, M metal ion, form the distribution of support type high dispersive, drying, under high temperature, roasting changes corresponding composite metal oxide into, obtain NiM after reduction and be distributed in support type high-dispersed nickel alloy catalyst in carrier particle exterior surface and duct, be applied to, in drippolene one section of selective hydrogenation reaction, effectively to improve the conversion ratio of catalyst, selective and stability, also can be used for methane reforming and catalysis CO, CO 2hydrogenation is for the reaction of lower carbon number hydrocarbons and alcohol.
Support type high-dispersed nickel alloy catalyst of the present invention, its composition structure is: alloy NiM is distributed in γ-Al 2o 3in carrier particle exterior surface and duct thereof, form the distribution of support type high dispersive alloy; Alloy NiM particle diameter is at 1-8nm, γ-Al 2o 3diameter of carrier is 20-40 order; With catalyst gross mass for benchmark, alloy NiM total load amount is 6-12wt%; M is Co, Zn, Cu, Fe or Cr.
The concrete preparation method of support type high-dispersed nickel alloy catalyst of the present invention is as follows:
A. be 20-40 object γ-Al by 3-5g particle diameter 2o 3particle, soluble nickel salt, soluble M salt, urea, join in 10ml deionized water fast, transfer to after vacuum impregnation 1-3h in autoclave, crystallization 12-24h at 90-130 DEG C of temperature, filter, spend deionized water particle, obtain support type high dispersive NiMAl-LDHs/Al 2o 3precursor;
B. by NiMAl-LDHs/Al 2o 3precursor is dry 6-12h at 60-100 DEG C, and then 400-600 DEG C of roasting 2-8h, obtains LP-NiMO/Al 2o 3;
C. the LP-NiMO/Al prepared by step B 2o 3load in micro fixed-bed reactor, at N 2protect lower 400-600 DEG C of heat treatment 0.5-2h, heating rate is 5-10 DEG C/min; Finally flow velocity is adopted to be the H of 30-80mL/min 2be the N of 10-30mL/min with flow velocity 2gaseous mixture reduce, reduction temperature is 400-600 DEG C, and the recovery time is 2-5h, and reduction pressure is 0.5-1MPa, namely obtains support type high-dispersed nickel alloy catalyst after completing.
In described steps A, the mol ratio of urea and metal ion is (2:1)-(4:1).
Described soluble nickel salt is nickel nitrate, nickel chloride or nickelous sulfate.
Described soluble M salt is nitric acid M, chlorination M or sulfuric acid M.
The support type high-dispersed nickel alloy catalyst above-mentioned method prepared is applied to catalytic cracking gasoline one section of selective hydrogenation reaction, its process conditions are: reaction temperature is 40-60 DEG C, the volume ratio of hydrogen and drippolene is 50-100, mass space velocity WHSV=10-30h -1, catalyst amount is 1.0-1.5g, and reaction gross pressure is 2.0-3.5MPa, and hydrogen partial pressure is 0.4-3.0MPa, reaction time 12-120h.
The support type high-dispersed nickel alloy catalyst that the present invention adopts in situ synthesis to prepare, Al 2o 3ball is not only used as catalyst carrier but also is used as the Al of growth in situ synthesis NiAl-LDHs presoma 3+source, obtains NiM/Al by NiMAl-LDHs presoma 2o 3alloy catalyst, this catalyst not only increases cinnamic conversion ratio, and can improve the selective of ethylo benzene, and then improves selective hydrogenation of cracked gasoline performance.And catalyst preparation process is without the need to an organic solvent or additive, and method is easy, environmental friendliness.
Accompanying drawing explanation
Fig. 1 is embodiment 12Ni1CoAl-LDHs/Al 2o 3(a, b) and LP-2Ni1CoO/Al 2o 3the surperficial SEM photo (a, c) of (c, d) and tangent plane SEM photo (b, d) and LP-2Ni1Co/Al 2o 3details in a play not acted out on stage, but told through dialogues scanning transmission electron microscope figure and line sweep figure (e) of corresponding metallic particles.
Fig. 2 is γ-Al in embodiment 1 2o 3carrier (a), NiAl-LDHs/Al 2o 3(b) presoma, and Ni:Co mass fraction is than the mNinCoAl-LDHs/Al for 3:1 (c), 2:1 (d), 1:1 (e) 2o 3presoma and CoAl-LDHs/Al 2o 3the XRD figure of presoma (f).
Fig. 3 is LP-Ni/Al in embodiment 1 2o 3(a, b), LP-2Ni1Co/Al 2o 3(c, d), LP-1Ni1Co/Al 2o 3(e, f) and IM-2Ni1Co/Al 2o 3the photo of the high-resolution-ration transmission electric-lens of (g, h).Particle size distribution (calculates based on each sample 150 particles) as shown in the figure.
Fig. 4 is support type high-dispersed nickel alloy catalyst in embodiment 1, LP-Ni/Al 2o 3catalyst, LP-Co/Al 2o 3catalyst and IM-NiCo/Al 2o 3catalyst is to the curve of styrene conversion rate-time.
Fig. 5 is LP-2Ni1Co/Al in embodiment 1 2o 3catalyst is to the curve of styrene conversion rate and the study on the stability of selective-time.
Detailed description of the invention
Embodiment 1
A. be 20-40 object γ-Al by 5g particle diameter 2o 3particle, Ni (NO 3) 26H 2o, Co (NO 3) 26H 2o, urea, join in 10ml deionized water fast, Ni and Co gross mass mark is 12wt%, different Ni/Co mass fraction ratio (m/n=3/1,2/1,1/1), urea: (Ni 2++ Co 2+) amount of substance ratio be 2:1, transfer to after vacuum impregnation 1h in autoclave, crystallization 24h at 130 DEG C of temperature, filter, spending deionized water particle to PH is 7, obtains support type high dispersive NiCoAl-LDHs/Al 2o 3precursor (SEM figure and XRD spectra are shown in Fig. 1 and Fig. 2);
B. by NiCoAl-LDHs/Al 2o 3precursor is dry 10h at 70 DEG C, and then 450 DEG C of roasting 4h, obtain LP-NiCoO/Al 2o 3;
C. the LP-NiCoO/Al prepared by step B 2o 3load in micro fixed-bed reactor, at N 2protect lower 500 DEG C of heat treatment 0.5h, heating rate is 10 DEG C/min; Finally flow velocity is adopted to be the H of 50mL/min 2be the N of 30mL/min with flow velocity 2gaseous mixture reduce, reduction temperature is 500 DEG C, and the recovery time is 3h, and reduction pressure is 0.5MPa, namely obtains support type high-dispersed nickel alloy catalyst, be designated as LP-NiCo/Al after completing 2o 3.
By the process conditions that the support type high-dispersed nickel alloy catalyst of above-mentioned preparation is used for drippolene one section of selective hydrogenation reaction be: catalyst amount 1.1g, reaction temperature is 40-60 DEG C, and the volume ratio of hydrogen and drippolene is 80, mass space velocity WHSV=30h -1, reaction gross pressure is 3.0MPa, and hydrogen partial pressure is 0.4-3.0MPa, reaction time 12h.The drippolene analogies composition used is styrene 10wt%, toluene 35wt% and normal heptane 55wt%, and product is analyzed by gas-chromatography.
Active component ratio and reaction time two conditions are investigated styrene conversion rate, the loaded catalyst prepared with traditional infusion process sample in contrast.Reaction condition is as follows, styrene conversion rate with the change of each condition as shown in Fig. 4 Fig. 5:
A) reaction temperature: 60 DEG C, hydrogen partial pressure: 2.0MPa, Ni load capacity is 12.0wt%, Co load capacity is 0 (not adding Co salt), reaction time: 12h.(Fig. 4)
B) reaction temperature: 60 DEG C, hydrogen partial pressure: 2.0MPa, Ni load capacity is 9.0wt%, Co load capacity is 3.0wt%, reaction time: 12h.(Fig. 4)
C) reaction temperature: 60 DEG C, hydrogen partial pressure: 2.0MPa, Ni load capacity is 8.0wt%, Co load capacity is 4.0wt%, reaction time: 12h.(Fig. 4)
D) reaction temperature: 60 DEG C, hydrogen partial pressure: 2.0MPa, Ni load capacity is 6.0wt%, Co load capacity is 6.0wt%, reaction time: 12h.(Fig. 4)
E) reaction temperature: 60 DEG C, hydrogen partial pressure: 2.0MPa, Ni load capacity is 0, Co load capacity is 12.0wt% (not adding Ni salt), reaction time: 12h.(Fig. 4)
F) reaction temperature: 60 DEG C, hydrogen partial pressure: 2.0MPa, Ni load capacity is 8.0wt%, Co load capacity is 4.0wt% (traditional infusion process preparation), reaction time: 12h.(Fig. 4)
G) reaction temperature: 60 DEG C, hydrogen partial pressure: 2.0MPa, Ni load capacity is 8.0wt%, Co load capacity is 4.0wt%, reaction time: 117h.(Fig. 5)
Carry out SEM and XRD to the material obtained to characterize, the results are shown in Figure 1 and Fig. 2, the 2Ni1CoAl-LDHs/Al obtained as seen from the figure 2o 3surface and tangent plane all grow NiCoAl-LDHs, reticulate and are uniformly distributed.
HRETEM sign is carried out to the material obtained, the results are shown in Figure 3, the LP-2Ni1Co/Al obtained as seen from Figure 3 2o 3in particle, 1-4nm particle size has accounted for 63%, LP-Ni/Al 2o 353%, and impregnated sample IM-2Ni1Co/Al 2o 3in be greater than 16nm particle and accounted for 53%.(LP refers to the preparation of growth in situ method, after described IM refer to typical impregnation method preparation)
STEM sign is carried out to the material obtained, the results are shown in Figure 1 (e), the LP-2Ni1Co/Al obtained can be found out by Fig. 1 (e) 2o 3define NiCo alloy phase.
Support type high-dispersed nickel alloy catalyst provided by the invention, is particularly suitable for drippolene one section of selective hydrogenation reaction.The IM-2Ni1Co/Al prepared with traditional infusion process 2o 3catalyst and monometallic LP-Ni/Al 2o 3catalyst is compared, and result is as shown in Fig. 4 Fig. 5:
1) as can be seen from Figure 4, cinnamic conversion ratio reaches peak 100.0% along with adding of Co, continues to add Co to LP-1Ni1Co/Al 2o 3, conversion ratio has dropped to 88.7%, and LP-Co/Al 2o 3but 10.6% is only had.Known appropriate Co can improve catalyst hydrogenation performance.
2) as can be seen from Figure 4, compared with the catalyst prepared with in situ synthesis, catalyst I M-2Ni1Co/Al prepared by traditional infusion process 2o 3conversion ratio only has 69.7%, and this illustrates that catalyst prepared by situ synthesis has excellent Activity and stabill, is not only that it has confinement effect, and the alloy phase of formation more has excellent cooperative effect.Confinement effect shows as active component and carrier has strong interaction, and the active component particles of formation is also little, and the Heterosis that particle size is little is the formation that can suppress carbon distribution.And the alloy phase formed more can improve the selectivity of catalyst and also can suppress the formation of carbon distribution.
3) as can be seen from Figure 4, the alloy catalyst prepared of in situ synthesis is relative to LP-Ni/Al 2o 3, conversion ratio and selective all apparently higher than single-metal reforming catalyst, the alloy effect that known alloy catalyst has and high activity, high selectivity and high stability that cooperative effect is brought.
4) as can be seen from Figure 5, LP-2Ni1Co/Al 2o 3initial activity reach 100.0%, react and can remain on 93.2% after 117 hours, selectively remain on 100.0%, carbon distribution value also only only has 2.76wt%, and is 1.65wt% in reaction after 12 hours.But for LP-Ni/Al 2o 3react and just reach 2.43wt%, IM-2Ni1Co/Al in 12 hours 2o 3reach 2.57wt% especially, known LP-2Ni1Co/Al 2o 3there is excellent anti-carbon performance.
Embodiment 2
A. be 20-40 object γ-Al by 5g particle diameter 2o 3particle, Ni (NO 3) 26H 2o, Zn (NO 3) 26H 2o, urea, join in 10ml deionized water fast, Ni and Zn gross mass mark is 12wt%, different Ni/Zn mass fraction ratio (m/n=3/1,2/1,1/1), urea: (Ni 2++ Zn 2+) amount of substance ratio be 2:1, transfer to after vacuum impregnation 1h in autoclave, crystallization 24h at 130 DEG C of temperature, filter, spending deionized water particle to PH is 7, obtains support type high dispersive NiZnAl-LDHs/Al 2o 3precursor;
B. by NiZnAl-LDHs/Al 2o 3precursor is dry 10h at 70 DEG C, and then 450 DEG C of roasting 4h, obtain LP-NiZnO/Al 2o 3;
C. the LP-NiZnO/Al prepared by step B 2o 3load in micro fixed-bed reactor, at N 2protect lower 500 DEG C of heat treatment 0.5h, heating rate is 10 DEG C/min; Finally flow velocity is adopted to be the H of 50mL/min 2be the N of 30mL/min with flow velocity 2gaseous mixture reduce, reduction temperature is 500 DEG C, and the recovery time is 3h, and reduction pressure is 0.5MPa, namely obtains support type high-dispersed nickel alloy catalyst, be designated as LP-NiZn/Al after completing 2o 3.
Embodiment 3
A. be 20-40 object γ-Al by 5g particle diameter 2o 3particle, Ni (NO 3) 26H 2o, Cu (NO 3) 23H 2o, urea, join in 10ml deionized water fast, Ni and Cu gross mass mark is 12wt%, different Ni/Cu mass fraction ratio (m/n=3/1,2/1,1/1), urea: (Ni 2++ Cu 2+) amount of substance ratio be 2:1, transfer to after vacuum impregnation 1h in autoclave, crystallization 24h at 130 DEG C of temperature, filter, spending deionized water particle to PH is 7, obtains support type high dispersive NiCuAl-LDHs/Al 2o 3precursor;
B. by NiCuAl-LDHs/Al 2o 3precursor is dry 10h at 70 DEG C, and then 450 DEG C of roasting 4h, obtain LP-NiCuO/Al 2o 3;
C. the LP-NiCuO/Al prepared by step B 2o 3load in micro fixed-bed reactor, at N 2protect lower 500 DEG C of heat treatment 0.5h, heating rate is 10 DEG C/min; Finally flow velocity is adopted to be the H of 50mL/min 2be the N of 30mL/min with flow velocity 2gaseous mixture reduce, reduction temperature is 500 DEG C, and the recovery time is 3h, and reduction pressure is 0.5MPa, namely obtains support type high-dispersed nickel alloy catalyst, be designated as LP-NiCu/Al after completing 2o 3.
Embodiment 4
A. be 20-40 object γ-Al by 5g particle diameter 2o 3particle, Ni (NO 3) 26H 2o, Fe (NO 3) 39H 2o, urea, join in 10ml deionized water fast, Ni and Fe gross mass mark is 12wt%, different Ni/Fe mass fraction ratio (m/n=3/1,2/1,1/1), urea: (Ni 2++ Fe 3+) amount of substance ratio be 2:1, transfer to after vacuum impregnation 1h in autoclave, crystallization 24h at 130 DEG C of temperature, filter, spending deionized water particle to PH is 7, obtains support type high dispersive NiFeAl-LDHs/Al 2o 3precursor;
B. by NiFeAl-LDHs/Al 2o 3precursor is dry 10h at 70 DEG C, and then 450 DEG C of roasting 4h, obtain LP-NiFeO/Al 2o 3;
C. the LP-NiFeO/Al prepared by step B 2o 3load in micro fixed-bed reactor, at N 2protect lower 500 DEG C of heat treatment 0.5h, heating rate is 10 DEG C/min; Finally flow velocity is adopted to be the H of 50mL/min 2be the N of 30mL/min with flow velocity 2gaseous mixture reduce, reduction temperature is 500 DEG C, and the recovery time is 3h, and reduction pressure is 0.5MPa, namely obtains support type high-dispersed nickel alloy catalyst, be designated as LP-NiFe/Al after completing 2o 3.
Embodiment 5
A. be 20-40 object γ-Al by 5g particle diameter 2o 3particle, Ni (NO 3) 26H 2o, Cr (NO 3) 39H 2o, urea, join in 10ml deionized water fast, Ni and Cr gross mass mark is 12wt%, different Ni/Cr mass fraction ratio (m/n=3/1,2/1,1/1), urea: (Ni 2++ Zn 2+) amount of substance ratio be 2:1, transfer to after vacuum impregnation 1 in autoclave, crystallization 24h at 130 DEG C of temperature, filter, spending deionized water particle to PH is 7, obtains support type high dispersive NiCrAl-LDHs/Al 2o 3precursor;
B. by NiCrAl-LDHs/Al 2o 3precursor is dry 10h at 70 DEG C, and then 450 DEG C of roasting 4h, obtain LP-NiCrO/Al 2o 3;
C. the LP-NiCrO/Al prepared by step B 2o 3load in micro fixed-bed reactor, at N 2protect lower 500 DEG C of heat treatment 0.5h, heating rate is 10 DEG C/min; Finally flow velocity is adopted to be the H of 50mL/min 2be the N of 30mL/min with flow velocity 2gaseous mixture reduce, reduction temperature is 500 DEG C, and the recovery time is 3h, and reduction pressure is 0.5MPa, namely obtains support type high-dispersed nickel alloy catalyst, be designated as LP-NiCr/Al after completing 2o 3.

Claims (7)

1. a support type high-dispersed nickel alloy catalyst, is characterized in that, its composition structure is: alloy NiM is distributed in γ-Al 2o 3in carrier particle exterior surface and duct thereof, form the distribution of support type high dispersive alloy; Alloy NiM particle diameter is at 1-8nm, γ-Al 2o 3diameter of carrier is 20-40 order; With catalyst gross mass for benchmark, alloy NiM total load amount is 6-12wt%; M is Co, Zn, Cu, Fe or Cr.
2. the preparation method of support type high-dispersed nickel alloy catalyst according to claim 1, it is characterized in that, its concrete operation step is as follows:
A. be 20-40 object γ-Al by 3-5g particle diameter 2o 3particle, soluble nickel salt, soluble M salt, urea, join in 10ml deionized water fast, transfer to after vacuum impregnation 1-3h in autoclave, crystallization 12-24h at 90-130 DEG C of temperature, filter, spend deionized water particle, obtain support type high dispersive NiMAl-LDHs/Al 2o 3precursor;
B. by NiMAl-LDHs/Al 2o 3precursor is dry 6-12h at 60-100 DEG C, and then 400-600 DEG C of roasting 2-8h, obtains LP-NiMO/Al 2o 3;
C. the LP-NiMO/Al prepared by step B 2o 3load in micro fixed-bed reactor, at N 2protect lower 400-600 DEG C of heat treatment 0.5-2h, heating rate is 5-10 DEG C/min; Finally flow velocity is adopted to be the H of 30-80mL/min 2be the N of 10-30mL/min with flow velocity 2gaseous mixture reduce, reduction temperature is 400-600 DEG C, and the recovery time is 2-5h, and reduction pressure is 0.5-1MPa, namely obtains support type high-dispersed nickel alloy catalyst after completing.
3. preparation method according to claim 2, is characterized in that, in described steps A, the mol ratio of urea and metal ion is (2:1)-(4:1).
4. preparation method according to claim 2, is characterized in that, described soluble nickel salt is nickel nitrate, nickel chloride or nickelous sulfate.
5. preparation method according to claim 2, is characterized in that, described soluble M salt is nitric acid M, chlorination M or sulfuric acid M.
6. the application of support type high-dispersed nickel alloy catalyst catalytic cracking gasoline one section of selective hydrogenation reaction for preparing of method according to claim 2.
7. application according to claim 6, is characterized in that, the process conditions of described catalytic cracking gasoline one section of selective hydrogenation reaction are: reaction temperature is 40-60 DEG C, and the volume ratio of hydrogen and drippolene is 50-100, mass space velocity WHSV=10-30h -1, catalyst amount is 1.0-1.5g, and reaction gross pressure is 2.0-3.5MPa, and hydrogen partial pressure is 0.4-3.0MPa, reaction time 12-120h.
CN201410670739.3A 2014-11-20 2014-11-20 Preparation method and catalytic application of supported type high-dispersion nickel-based alloy catalyst Pending CN104368345A (en)

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