CN106902826B - 一种包覆Ni-Al2O3@Al2O3-SiO2催化剂及制备方法和应用 - Google Patents
一种包覆Ni-Al2O3@Al2O3-SiO2催化剂及制备方法和应用 Download PDFInfo
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 229910052593 corundum Inorganic materials 0.000 title claims abstract description 36
- 229910001845 yogo sapphire Inorganic materials 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 29
- 238000005253 cladding Methods 0.000 title claims abstract description 18
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 66
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 66
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 66
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 66
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 66
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 66
- 239000003054 catalyst Substances 0.000 claims abstract description 57
- 239000002245 particle Substances 0.000 claims abstract description 16
- 239000006185 dispersion Substances 0.000 claims abstract description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 58
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 claims description 36
- 239000000243 solution Substances 0.000 claims description 26
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 23
- 239000004411 aluminium Substances 0.000 claims description 22
- 229910052782 aluminium Inorganic materials 0.000 claims description 22
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 229910003310 Ni-Al Inorganic materials 0.000 claims description 19
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 claims description 19
- 229910052739 hydrogen Inorganic materials 0.000 claims description 19
- 239000001257 hydrogen Substances 0.000 claims description 18
- 238000010792 warming Methods 0.000 claims description 18
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 17
- 229910052710 silicon Inorganic materials 0.000 claims description 17
- 239000010703 silicon Substances 0.000 claims description 17
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 15
- 238000005984 hydrogenation reaction Methods 0.000 claims description 15
- 150000002815 nickel Chemical class 0.000 claims description 15
- 239000002243 precursor Substances 0.000 claims description 15
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 claims description 14
- DHKHKXVYLBGOIT-UHFFFAOYSA-N acetaldehyde Diethyl Acetal Natural products CCOC(C)OCC DHKHKXVYLBGOIT-UHFFFAOYSA-N 0.000 claims description 14
- 238000001035 drying Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 14
- 239000007864 aqueous solution Substances 0.000 claims description 13
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 10
- 229910052759 nickel Inorganic materials 0.000 claims description 10
- 235000019441 ethanol Nutrition 0.000 claims description 9
- 239000008367 deionised water Substances 0.000 claims description 8
- 229910021641 deionized water Inorganic materials 0.000 claims description 8
- 239000000428 dust Substances 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 8
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 7
- -1 Cyclic acetal Chemical class 0.000 claims description 7
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 7
- 239000000908 ammonium hydroxide Substances 0.000 claims description 7
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 claims description 7
- 229960000935 dehydrated alcohol Drugs 0.000 claims description 7
- 229960004756 ethanol Drugs 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 7
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 7
- 238000010992 reflux Methods 0.000 claims description 7
- 239000012074 organic phase Substances 0.000 claims description 6
- 239000000725 suspension Substances 0.000 claims description 6
- PIAOXUVIBAKVSP-UHFFFAOYSA-N γ-hydroxybutyraldehyde Chemical compound OCCCC=O PIAOXUVIBAKVSP-UHFFFAOYSA-N 0.000 claims description 6
- BNGXYYYYKUGPPF-UHFFFAOYSA-M (3-methylphenyl)methyl-triphenylphosphanium;chloride Chemical compound [Cl-].CC1=CC=CC(C[P+](C=2C=CC=CC=2)(C=2C=CC=CC=2)C=2C=CC=CC=2)=C1 BNGXYYYYKUGPPF-UHFFFAOYSA-M 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- KBJMLQFLOWQJNF-UHFFFAOYSA-N nickel(ii) nitrate Chemical compound [Ni+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O KBJMLQFLOWQJNF-UHFFFAOYSA-N 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 5
- SMZOGRDCAXLAAR-UHFFFAOYSA-N aluminium isopropoxide Chemical compound [Al+3].CC(C)[O-].CC(C)[O-].CC(C)[O-] SMZOGRDCAXLAAR-UHFFFAOYSA-N 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 4
- LFQCEHFDDXELDD-UHFFFAOYSA-N tetramethyl orthosilicate Chemical compound CO[Si](OC)(OC)OC LFQCEHFDDXELDD-UHFFFAOYSA-N 0.000 claims description 4
- 229910021586 Nickel(II) chloride Inorganic materials 0.000 claims description 3
- QMMRZOWCJAIUJA-UHFFFAOYSA-L nickel dichloride Chemical compound Cl[Ni]Cl QMMRZOWCJAIUJA-UHFFFAOYSA-L 0.000 claims description 3
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 claims description 3
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 claims description 3
- 150000004645 aluminates Chemical class 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 15
- NMPJHMFXHISVBR-UHFFFAOYSA-N 4-(oxolan-2-yloxy)butan-1-ol Chemical compound OCCCCOC1CCCO1 NMPJHMFXHISVBR-UHFFFAOYSA-N 0.000 description 7
- 150000001241 acetals Chemical class 0.000 description 7
- 239000012298 atmosphere Substances 0.000 description 7
- 229910003849 O-Si Inorganic materials 0.000 description 6
- 229910003872 O—Si Inorganic materials 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 239000006227 byproduct Substances 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 150000002431 hydrogen Chemical class 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- JSPXPZKDILSYNN-UHFFFAOYSA-N but-1-yne-1,4-diol Chemical class OCCC#CO JSPXPZKDILSYNN-UHFFFAOYSA-N 0.000 description 2
- 238000009903 catalytic hydrogenation reaction Methods 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- PGZIKUPSQINGKT-UHFFFAOYSA-N dialuminum;dioxido(oxo)silane Chemical compound [Al+3].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O PGZIKUPSQINGKT-UHFFFAOYSA-N 0.000 description 2
- 150000002373 hemiacetals Chemical class 0.000 description 2
- 229920002521 macromolecule Polymers 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 150000005846 sugar alcohols Polymers 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 150000001299 aldehydes Chemical class 0.000 description 1
- CDQSJQSWAWPGKG-UHFFFAOYSA-N butane-1,1-diol Chemical compound CCCC(O)O CDQSJQSWAWPGKG-UHFFFAOYSA-N 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- VXPFEVUAMVPPQU-UHFFFAOYSA-N dioxosilane nickel Chemical compound [Ni].O=[Si]=O VXPFEVUAMVPPQU-UHFFFAOYSA-N 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 150000002240 furans Chemical class 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000013081 microcrystal Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
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- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/002—Mixed oxides other than spinels, e.g. perovskite
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- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/74—Iron group metals
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Abstract
一种包覆Ni‑Al2O3@Al2O3‑SiO2催化剂的比表面积98m2/g~245m2/g,孔容0.25cm3/g~1.1cm3/g,催化剂中载体Al2O3与活性组分Ni的质量比为Al2O3:Ni=100:4~26,载体Al2O3与包覆层Al2O3‑SiO2的质量比为Al2O3:Al2O3‑SiO2=100:0.1~3,包覆层Al2O3‑SiO2中Al:Si摩尔比为0.01~1,Ni颗粒以无定形或高分散状态存在于载体Al2O3表面,晶粒尺寸小于8nm,填充于Ni颗粒之间。本发明具有制备简单,选择性好的优点。
Description
技术领域
本发明属于一种包覆Ni-Al2O3@Al2O3-SiO2催化剂及制备方法及应用。
背景技术
环状缩醛2-(4′-羟基丁氧基)-四氢呋喃是Reppe法1,4-丁炔二醇加氢制备 1,4-丁二醇反应过程中难以避免的副产物,其本身无法通过直接加氢的方法脱除,而且与1,4-丁二醇形成共沸物,用常规的蒸馏法难以分离。缩醛2-(4′- 羟基丁氧基)-四氢呋喃的残留严重影响1,4-丁二醇产品的纯度与色度,直接影响1,4-丁二醇品质及其在下游领域中的应用。
US6137016描述了一种通过加氢纯化含有少量环状缩醛2-(4′-羟基丁氧基)-四氢呋喃的1,4-丁二醇的方法,由于所使用加氢催化剂为通用型加氢催化剂,其加氢效果并不理想。CN 102145286B公开了一种Ni-SiO2/Al2O3催化剂及制备方法,该催化剂可有效实现环状缩醛2-(4′-羟基丁氧基)-四氢呋喃的水解、加氢转化,但其制备过程较为繁锁。
发明内容
本发明的目的是提供一种制备简单,选择性好的包覆Ni-Al2O3@Al2O3-SiO2催化剂及制备方法和应用。
本发明催化剂比表面积98m2/g~245m2/g,孔容0.25cm3/g~1.1cm3/g,催化剂中载体Al2O3与活性组分Ni的质量比为Al2O3:Ni=100:4~26,Ni颗粒以无定形或高分散状态存在于载体Al2O3表面,晶粒尺寸小于8nm,载体Al2O3与包覆层Al2O3-SiO2的质量比为Al2O3:Al2O3-SiO2=100:0.1~3,包覆层Al2O3-SiO2中Al:Si摩尔比为0.01~0.1:1,填充于Ni颗粒之间。
本发明提供的Ni-Al2O3@Al2O3-SiO2催化剂的制备方法,其特征在于包括以下步骤:
(1)将Al2O3载体经100℃~150℃抽真空处理10min~30min,或直接在100℃~150℃加热1h~10h,后降至室温备用;
(2)配制镍含量0.05g/mL~0.2g/mL的镍盐水溶液;
(3)按每100g Al2O3载体取80mL~130mL镍盐水溶液的比例,将步骤 (2)配制的镍盐水溶液浸渍到步骤(1)所述的载体上,静置20min~120min;然后升温至100℃~150℃烘干2h~24h,优选3h~12h;在空气或氮气气氛下焙烧,以2℃/min~10℃/min升温至350℃~500℃,恒温1h~24h;得到NiO/Al2O3前体;
(4)配制铝前驱物、硅前驱物的乙醇-水溶液,溶液中以Al2O3和SiO2计,总浓度为0.0001g/mL~0.0015g/mL,以氨水调节其pH值在8.0~8.5之间;
(5)按步骤(3)NiO/Al2O3前体中每100g Al2O3取1000mL~2000mL铝、硅前驱物的乙醇-水溶液的量,将步骤(3)得到的NiO/Al2O3前体悬浮于步骤(4) 配制的溶液中,于20℃~60℃恒温搅拌回流1h~24h,过滤后分别以无水乙醇、0.01M的稀硝酸、去离子水离心洗涤3次~5次,样品于80℃~150℃烘干2h~24h,优选3h~12h;
(6)将步骤(5)所得的样品在空气或氮气气氛下焙烧,以2℃/min~10℃/min升温至400℃~550℃,恒温1h~24h;后经氢气在空速500/h~ 2000/h条件下于350℃~650℃还原1h~24h;得到Ni-Al2O3@Al2O3-SiO2催化剂。
步骤(1)所述的Al2O3的比表面积为110m2/g~260m2/g,孔容为0.5cm3/g ~1.3cm3/g。
步骤(2)所述的镍盐选自硝酸镍、硫酸镍或氯化镍中的一种。
步骤(4)所述的硅前驱物为正硅酸乙酯、正硅酸甲酯中的一种,优选正硅酸乙酯;所述的铝前驱物为异丙醇铝、正丁醇铝、硝酸铝中的一种,优选硝酸铝;所述的乙醇-水溶液中乙醇:水的摩尔比为4~100:1。
本发明催化剂的应用包括如下步骤:
催化剂用于1,4-丁炔二醇高压加氢催化合成1,4-丁二醇,原料中含水64 wt%~72wt%,有机相中1,4-丁二醇含量90wt%~91.5wt%;丁醇含量1wt%~ 2wt%;4-羟基丁醛含量1.3wt%~1.8wt%;1,4-丁炔二醇含量1.5wt%~2wt%; 1,4-丁烯二醇含量2.7wt%~3.2wt%;环状缩醛2-(4′-羟基丁氧基)-四氢呋喃含量0.8wt%~1.2wt%;羰基数:8mg(KOH)/g~12mg(KOH)/g,在反应温度 100℃~150℃,压力10MPa~20MPa,空速1.1/h~1.7/h条件下进行加氢,经加氢后有机相中1,4-丁二醇含量96.44wt%~97.76wt%;丁醇含量1.3 wt%~2.5wt%;4-羟基丁醛含量0.03wt%~0.08wt%;1,4-丁炔二醇含量 0.01~0.05wt%;1,4-丁烯二醇含量0.03wt%~0.07wt%;环状缩醛2-(4′- 羟基丁氧基)-四氢呋喃含量0.01wt%~0.03wt%;羰基数:0.03mg(KOH)/g~0.05mg(KOH)/g。
该催化剂也可适用于原料为含25wt%~35wt%的1,4-丁炔二醇的水溶液的直接加氢转化,采用外循环加氢反应工艺,进料方式:上进下出;反应条件:反应温度105℃~150℃,氢气压力10MPa~22MPa,液体空速1.0/h~ 1.7/h,循环比18~22:1。加氢后的物料有机相中1,4-丁二醇含量≥96wt%,副产物丁醇含量≤1.2wt%,不饱和生色物质1,4-丁炔二醇、1,4-丁烯二醇、4- 羟基丁醛、半缩醛及缩醛2-(4′-羟基丁氧基)-四氢呋喃等总含量≤0.06wt%,其余为大分子聚合物,该物料羰基数:0.03mg(KOH)/g~0.05mg(KOH)/g。
本发明与现有技术相比具有的优点:
1、以浸渍法在氧化铝载体上引入活性组分Ni,Ni分布于氧化铝表面的四面体、八面体空穴,并以此为核生长成为微晶颗粒,该颗粒具有高的分散度。
2、在Ni/Al2O3催化剂表面,以沉积沉淀的方式引入Al2O3-SiO2层,由于 SiO2与NiO间不发生反应,且相互作用极弱,Al2O3-SiO2仅在NiO颗粒间隙暴露的氧化铝表面,随Al2O3-SiO2含量的增加,当暴露的氧化铝表面全部被单层 Al2O3-SiO2覆盖后,将在暴露的单层Al2O3-SiO2表面进一步生长二、三、四……层的Al2O3-SiO2。
3、沉积完成后的样品,先后经过无水乙醇、0.01M的稀硝酸、去离子水洗涤,有效去除了嫁接过程中残留于催化剂表面的弱吸附组分,特别是在NiO 表面弱吸附的Al2O3-SiO2物种,保证了活性组分Ni物种的有效暴露。
4、传统催化剂制备过程中,由于NiO与Al2O3间强的相互作用,往往需要在较高的温度下才能将NiO还原为活性金属Ni,而高的还原温度又促使了金属Ni的迁移聚集,降低表面活性位点的数目,加氢活性也相应降低。本发明中,Al2O3-SiO2层存在于NiO颗粒的间隙,通过限域效应可以有效阻止高温还原过程中金属Ni的迁移聚集,使活性金属镍保持高的分散度,从而使催化剂表现出高的加氢活性。
5、Al2O3-SiO2层形成的Al-O-Si结构,使其具有了特定的表面酸性质,可以促使环状缩醛2-(4′-羟基丁氧基)-四氢呋喃水解为4-羟基丁醛,后在相邻高活性暴露加氢中心Ni的催化作用下加氢转化为1,4-丁二醇。该催化剂中酸性中心与加氢活性中心的协同作用,实现了环状缩醛2-(4′-羟基丁氧基)- 四氢呋喃的高效转化,最终达到降低环状缩醛2-(4′-羟基丁氧基)-四氢呋喃含量,提高1,4-丁二醇的产品品质,降低产品色度的目的。
6、Al2O3-SiO2层包覆于氧化铝表面,阻止了水对氧化铝载体的进攻,抑制了载体氧化铝的水合脱结构,有效提高了催化剂在含水体系中的水热稳定性,延长了催化剂使用寿命。
具体实施方式
实施例1
(1)取比表面积为110m2/g,孔容为0.5cm3/g的Al2O3载体经100℃抽真空处理10min,后降至室温备用;配制镍含量0.05g/mL的硝酸镍水溶液;取80mL上述配制的镍盐水溶液,浸渍到100g前述的Al2O3载体上,静置20min,升温至100℃烘干2h;在空气气氛下焙烧以2℃/min升温至350 ℃,恒温1h;得到Al2O3:Ni质量比为100:4的NiO/Al2O3前体。
按Al:Si摩尔比为0.01:1,称取异丙醇铝与正硅酸乙酯,配制以Al2O3-SiO2计算其浓度为0.0001g/mL的铝、硅前驱物的乙醇-水溶液,乙醇-水溶液中乙醇:水的摩尔比为4:1,以氨水调节其pH值在8.0;取上述制备的Al2O3:Ni 质量比为100:4的NiO/Al2O3前体悬浮于1000mL铝、硅前驱物的乙醇-水溶液中,20℃恒温搅拌回流1h,过滤后分别以无水乙醇、0.01M的稀硝酸、去离子水离心洗涤3次,样品于80℃烘干2h;所得的样品置于焙烧炉中,在空气气氛下焙烧:以2℃/min升温至400℃,恒温1h;后经氢气在空速500/h 条件于350℃还原1h;得到质量组成为Al2O3:Al2O3-SiO2:Ni=100:0.1:4的 Ni-Al2O3@Al2O3-SiO2催化剂,其中Al2O3-SiO2层中Al:Si摩尔比为0.01:1。该催化剂比表面积105m2/g,孔容0.45cm3/g,Ni颗粒以无定形,Al2O3-SiO2层形成Al-O-Si,填充于Ni颗粒之间。该催化剂编号为1#。
实施例2
(1)取比表面积为110m2/g,孔容为0.5cm3/g的Al2O3载体经150℃抽真空处理30min,后降至室温备用;配制镍含量0.2g/mL的硫酸镍的镍盐水溶液;取130mL上述配制的镍盐水溶液,浸渍到100g前述的Al2O3载体上,静置120min,升温至150℃烘干24h;在氮气气氛下焙烧以10℃/min升温至500℃,恒温24h;得到Al2O3:Ni质量比为100:26的NiO/Al2O3前体。
按Al:Si摩尔比为0.08:1,称取正丁醇铝与正硅酸甲酯,配制以Al2O3-SiO2计算其浓度为0.0015g/mL的铝、硅前驱物的乙醇-水溶液,乙醇-水溶液中乙醇:水的摩尔比为100:1,以氨水调节其pH值在8.5;取上述制备的Al2O3:Ni 质量比为100:26的NiO/Al2O3前体悬浮于2000mL铝、硅前驱物的乙醇-水溶液中,60℃恒温搅拌回流24h,过滤后分别以无水乙醇、0.01M的稀硝酸、去离子水离心洗涤5次,样品于150℃烘干24h;所得的样品置于焙烧炉中,在氮气气氛下焙烧:以10℃/min升温至550℃,恒温24h;后经氢气在空速2000/h条件下于650℃还原24h;得到质量组成为Al2O3:Al2O3-SiO2:Ni= 100:3:26的Ni-Al2O3@Al2O3-SiO2催化剂,Al2O3-SiO2层中Al:Si摩尔比为 0.08:1,该催化剂比表面积98m2/g,孔容0.25cm3/g,Ni颗粒以高分散状态存在于载体Al2O3表面,晶粒尺寸8nm,Al2O3-SiO2层形成Al-O-Si键填充于Ni颗粒之间。该催化剂编号为2#。
实施例3
(1)取比表面积为260m2/g,孔容为1.3cm3/g的Al2O3载体100℃鼓风烘箱中加热1h,后降至室温备用;配制镍含量0.05g/mL的氯化镍的镍盐水溶液;取80mL上述配制的镍盐水溶液,浸渍到100g前述的Al2O3载体上,静置80min,升温至120℃烘干3h;在空气气氛下焙烧以8℃/min升温至 450℃,恒温18h;得到Al2O3:Ni质量比为100:4的NiO/Al2O3前体。
按Al:Si摩尔比为0.1:1,称取硝酸铝与正硅酸甲酯,配制以Al2O3-SiO2计算其浓度为0.0001g/mL的铝、硅前驱物的乙醇-水溶液,乙醇-水溶液中乙醇:水的摩尔比为10:1,以氨水调节其pH值在8.2;取上述制备的Al2O3:Ni 质量比为100:4的NiO/Al2O3前体悬浮于1000mL铝、硅前驱物的乙醇-水溶液中,40℃恒温搅拌回流12h,过滤后分别以无水乙醇、0.01M的稀硝酸、去离子水离心洗涤4次,样品于150℃烘干3h;所得的样品置于焙烧炉中,在氮气气氛下焙烧:以8℃/min升温至500℃,恒温12h;后经氢气在空速 1000/h条件下于550℃还原10h;得到质量组成为Al2O3:Al2O3-SiO2:Ni= 100:0.1:4的Ni-Al2O3@Al2O3-SiO2催化剂,Al2O3-SiO2层中Al:Si的摩尔比为 0.1:1,该催化剂比表面积245m2/g,孔容1.10cm3/g,Ni颗粒以无定形状态存在于载体Al2O3表面,Al2O3-SiO2层形成Al-O-Si键填充于Ni颗粒之间。该催化剂编号为3#。
实施例4
(1)取比表面积为160m2/g,孔容为0.75cm3/g的Al2O3载体经150℃鼓风烘箱中加热10h,后降至室温备用;配制镍含量0.10g/mL的硝酸镍的镍盐水溶液;取95mL上述配制的镍盐水溶液,浸渍到100g前述的Al2O3载体上,静置80min,升温至120℃烘干12h;在空气气氛下焙烧以2℃/min 升温至400℃,恒温5h;得到Al2O3:Ni质量比为100:9.5的NiO/Al2O3前体。
按Al:Si摩尔比为0.05:1,称取异丙醇铝与正硅酸乙酯,配制以Al2O3-SiO2计算其浓度为0.0008g/mL的铝、硅前驱物的乙醇-水溶液,乙醇-水溶液中乙醇:水的摩尔比为20:1,以氨水调节其pH值在8.4;取上述制备的Al2O3:Ni 质量比为100:9.5的NiO/Al2O3前体悬浮于1300mL铝、硅前驱物的乙醇-水溶液中,20℃恒温搅拌回流24h,过滤后分别以无水乙醇、0.01M的稀硝酸、去离子水离心洗涤3次,样品于100℃烘干12h;所得的样品置于焙烧炉中,在氮气气氛下焙烧:以10℃/min升温至400℃,恒温1h;后经氢气在1500/h 空速下于450℃还原24h;得到质量组成为Al2O3:Al2O3-SiO2:Ni= 100:1.04:9.5的Ni-Al2O3@Al2O3-SiO2催化剂,Al2O3-SiO2层中Al:Si的摩尔比为0.05:1,该催化剂比表面积145m2/g,孔容0.61cm3/g,Ni颗粒以高分散状态存在于载体Al2O3表面,晶粒尺寸6.3nm;Al2O3-SiO2层形成Al-O-Si键填充于Ni颗粒之间。该催化剂编号为4#。
实施例5
取比表面积为210m2/g,孔容为1.0cm3/g的Al2O3载体经130℃鼓风烘箱中加热5h,后降至室温备用;配制镍含量0.15g/mL的硝酸镍的镍盐水溶液;取110mL上述配制的镍盐水溶液,浸渍到100g前述的Al2O3载体上,静置20min,升温至100℃烘干3h;在空气气氛下焙烧以10℃/min升温至500 ℃,恒温1h;得到Al2O3:Ni质量比为100:16.5的NiO/Al2O3前体。
按Al:Si摩尔比为0.07:1,称取正丁醇铝与正硅酸乙酯,配制以Al2O3-SiO2计算其浓度为0.0012g/mL的铝、硅前驱物的乙醇-水溶液,乙醇-水溶液中乙醇:水的摩尔比为4:1,以氨水调节其pH值在8.0;取上述制备的Al2O3:Ni 质量比为100:16.5的NiO/Al2O3前体悬浮于1700mL铝、硅前驱物的乙醇-水溶液中,20℃恒温搅拌回流24h,过滤后分别以无水乙醇、0.01M的稀硝酸、去离子水离心洗涤5次,样品于80℃烘干3h;所得的样品置于焙烧炉中,在空气气氛下焙烧:以2℃/min升温至400℃,恒温1h;后经氢气在空速1500/h 条件下于350℃还原1h;得到质量组成为Al2O3:Al2O3-SiO2:Ni=100:2.04:16.5的Ni-Al2O3@Al2O3-SiO2催化剂,Al2O3-SiO2层中Al:Si的摩尔比为0.07:1,该催化剂比表面积183m2/g,孔容0.85cm3/g,Ni颗粒以高分散状态存在于载体Al2O3表面,晶粒尺寸7.5nm;Al2O3-SiO2层形成Al-O-Si键填充于Ni颗粒之间。该催化剂编号为5#。
实施例6
催化剂用于1,4-丁炔二醇高压加氢催化合成1,4-丁二醇,原料中含水约64 wt%~72wt%,有机相中1,4-丁二醇含量90wt%~91.5wt%;丁醇含量1wt%~ 2wt%;4-羟基丁醛含量1.3wt%~1.8wt%;1,4-丁炔二醇含量1.5wt%~2wt%; 1,4-丁烯二醇含量2.7wt%~3.2wt%;环状缩醛2-(4′-羟基丁氧基)-四氢呋喃含量0.8wt%~1.2wt%;羰基数:8mg(KOH)/g~12mg(KOH)/g,在反应温度 100℃~150℃,压力10MPa~20MPa,空速1.1/h~1.7/h条件下进行加氢,经加氢后有机相中1,4-丁二醇含量96.44wt%~97.76wt%;丁醇含量1.3wt%~ 2.5wt%;4-羟基丁醛含量0.03wt%~0.08wt%;1,4-丁炔二醇含量0.01wt%~ 0.05wt%;1,4-丁烯二醇含量0.03wt%~0.07wt%;环状缩醛2-(4′-羟基丁氧基)- 四氢呋喃含量0.01wt%~0.03wt%;羰基数:0.03mg(KOH)/g~0.05 mg(KOH)/g。各催化剂评价所用原料组成见表1,催化加氢反应条件见表2,各催化剂加氢评价后物料组成见表3。
表1各催化剂评价所用原料组成
表2催化加氢反应条件
表3各催化剂加氢评价后物料组成
实施例7
取上述1#-5#号催化剂,以含25wt%~35wt%的1,4-丁炔二醇水溶液为原料,采用外循环加氢反应工艺,进料方式:上进下出;反应条件:反应温度105℃~150℃,氢气压力10MPa~22MPa,液体空速1.0/h~1.7/h,循环比18~22:1。两种工艺加氢后的物料有机相中1,4-丁二醇含量≥96wt%,副产物丁醇含量≤1.2wt%,不饱和生色物质1,4-丁炔二醇、1,4-丁烯二醇、4- 羟基丁醛、半缩醛及缩醛2-(4′-羟基丁氧基)-四氢呋喃等总含量≤0.06wt%,其余为大分子聚合物,该物料羰基数:0.03mg(KOH)/g~0.05mg(KOH)/g。具体的反应条件及结果见表4。
表4
Claims (13)
1.一种包覆Ni-Al2O3@Al2O3-SiO2催化剂,其特征在于催化剂比表面积98m2/g~245m2/g,孔容0.25cm3/g~1.1cm3/g,催化剂中载体Al2O3与活性组分Ni的质量比为Al2O3:Ni=100:4~26,Ni颗粒以无定形或高分散状态存在于载体Al2O3表面,晶粒尺寸小于8nm,载体Al2O3与包覆层Al2O3-SiO2的质量比为Al2O3:Al2O3-SiO2=100:0.1~3,包覆层Al2O3-SiO2中Al:Si摩尔比为0.01~0.1:1,填充于Ni颗粒之间。
2.如权利要求1所述的一种包覆Ni-Al2O3@Al2O3-SiO2催化剂的制备方法,其特征在于包括以下步骤:
(1)将Al2O3载体经100℃~150℃抽真空处理10min~30min,或直接在100℃~150℃加热1h~10h,后降至室温备用;
(2)配制镍含量0.05g/mL~0.2g/mL的镍盐水溶液;
(3)按每100g Al2O3载体取80mL~130mL镍盐水溶液的比例,将步骤(2)配制的镍盐水溶液浸渍到步骤(1)所述的载体上,静置20min~120min;然后升温至100℃~150℃烘干2h~24h,在空气或氮气气氛下焙烧,以2℃/min~10℃/min升温至350℃~500℃,恒温1h~24h;得到NiO/Al2O3前体;
(4)配制铝前驱物、硅前驱物的乙醇-水溶液,以Al2O3和SiO2计,其总浓度为0.0001g/mL~0.0015g/mL,以氨水调节其pH值在8.0~8.5之间;其中Al:Si摩尔比为0.01~0.1:1;
(5)按步骤(3)NiO/Al2O3前体中每100g Al2O3取1000~2000mL铝、硅前驱物的乙醇-水溶液的量,将步骤(3)得到的NiO/Al2O3前体悬浮于步骤(4)配制的溶液中,于20℃~60℃恒温搅拌回流1h~24h,过滤后分别以无水乙醇、0.01M的稀硝酸、去离子水离心洗涤3次~5次,样品于80℃~150℃烘干2h~24h;
(6)将步骤(5)所得的样品在空气或氮气气氛下焙烧,以2℃/min~10℃/min升温至400℃~550℃,恒温1h~24h;后经氢气在空速500/h~2000/h条件下于350℃~650℃还原1h~24h;得到Ni-Al2O3@Al2O3-SiO2催化剂。
3.如权利要求2所述的一种包覆Ni-Al2O3@Al2O3-SiO2催化剂的制备方法,其特征在于步骤(1)所述的Al2O3的比表面积为110m2/g~260m2/g,孔容为0.5cm3/g~1.3cm3/g。
4.如权利要求2所述的一种包覆Ni-Al2O3@Al2O3-SiO2催化剂的制备方法,其特征在于步骤(2)所述的镍盐为硝酸镍、硫酸镍或氯化镍中的一种。
5.如权利要求2所述的一种包覆Ni-Al2O3@Al2O3-SiO2催化剂的制备方法,其特征在于步骤(3)所述的烘干时间为3h~12h。
6.如权利要求2所述的一种包覆Ni-Al2O3@Al2O3-SiO2催化剂的制备方法,其特征在于步骤(4)中硅前驱物为正硅酸乙酯、正硅酸甲酯中的一种。
7.如权利要求6所述的一种包覆Ni-Al2O3@Al2O3-SiO2催化剂的制备方法,其特征在于所述的硅前驱物为正硅酸乙酯。
8.如权利要求2所述的一种包覆Ni-Al2O3@Al2O3-SiO2催化剂的制备方法,其特征在于步骤(4)所述的铝前驱物为异丙醇铝、正丁醇铝、硝酸铝中的一种。
9.如权利要求8所述的一种包覆Ni-Al2O3@Al2O3-SiO2催化剂的制备方法,其特征在于所述的铝前驱物为硝酸铝。
10.如权利要求2所述的一种包覆Ni-Al2O3@Al2O3-SiO2催化剂的制备方法,其特征在于步骤(4)所述的乙醇-水溶液中乙醇:水的摩尔比为4~100:1。
11.如权利要求2所述的一种包覆Ni-Al2O3@Al2O3-SiO2催化剂的制备方法,其特征在于步骤(5)所述的烘干时间为3h~12h。
12.如权利要求1所述的一种包覆Ni-Al2O3@Al2O3-SiO2催化剂的应用,其特征在于包括如下步骤:
催化剂用于1,4-丁炔二醇高压加氢催化合成1,4-丁二醇,原料中含水64wt%~72wt%,有机相中1,4-丁二醇含量90wt%~91.5wt%;丁醇含量1wt%~2wt%;4-羟基丁醛含量1.3wt%~1.8wt%;1,4-丁炔二醇含量1.5wt%~2wt%;1,4-丁烯二醇含量2.7wt%~3.2wt%;环状缩醛2-(4′-羟基丁氧基)-四氢呋喃含量0.8wt%~1.2wt%;羰基数:8mg(KOH)/g~12mg(KOH)/g,在反应温度100℃~150℃,压力10MPa~20MPa,空速1.1/h~1.7/h条件下进行加氢。
13.如权利要求1所述的一种包覆Ni-Al2O3@Al2O3-SiO2催化剂的应用,其特征在于包括如下步骤:
催化剂用于原料为含25wt%~35wt%的1,4-丁炔二醇的水溶液的直接加氢转化,采用外循环加氢反应工艺,进料方式:上进下出;反应条件:反应温度105℃~150℃,氢气压力10MPa~22MPa,液体空速1.0/h~1.7/h,循环比18~22:1。
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