CN107282041B - 用于hmf转移加氢产生dmf的催化剂的制备方法 - Google Patents
用于hmf转移加氢产生dmf的催化剂的制备方法 Download PDFInfo
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- 239000003054 catalyst Substances 0.000 title claims abstract description 43
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 title abstract description 38
- 238000006243 chemical reaction Methods 0.000 claims abstract description 43
- 238000003756 stirring Methods 0.000 claims abstract description 39
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229920000168 Microcrystalline cellulose Polymers 0.000 claims abstract description 23
- 239000008108 microcrystalline cellulose Substances 0.000 claims abstract description 23
- 229940016286 microcrystalline cellulose Drugs 0.000 claims abstract description 23
- 235000019813 microcrystalline cellulose Nutrition 0.000 claims abstract description 22
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 19
- 239000001257 hydrogen Substances 0.000 claims abstract description 19
- 238000000502 dialysis Methods 0.000 claims abstract description 18
- JHJLBTNAGRQEKS-UHFFFAOYSA-M sodium bromide Chemical compound [Na+].[Br-] JHJLBTNAGRQEKS-UHFFFAOYSA-M 0.000 claims abstract description 18
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 238000001354 calcination Methods 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000008367 deionised water Substances 0.000 claims abstract description 9
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 9
- 238000001035 drying Methods 0.000 claims abstract description 9
- 239000001509 sodium citrate Substances 0.000 claims abstract description 9
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims abstract description 9
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims abstract description 9
- 150000001875 compounds Chemical class 0.000 claims abstract description 6
- 238000003760 magnetic stirring Methods 0.000 claims abstract description 5
- 239000002243 precursor Substances 0.000 claims abstract description 5
- YAXWOADCWUUUNX-UHFFFAOYSA-N 1,2,2,3-tetramethylpiperidine Chemical compound CC1CCCN(C)C1(C)C YAXWOADCWUUUNX-UHFFFAOYSA-N 0.000 claims abstract description 3
- RKMGAJGJIURJSJ-UHFFFAOYSA-N 2,2,6,6-Tetramethylpiperidine Substances CC1(C)CCCC(C)(C)N1 RKMGAJGJIURJSJ-UHFFFAOYSA-N 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims abstract 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 24
- NOEGNKMFWQHSLB-UHFFFAOYSA-N 5-hydroxymethylfurfural Chemical compound OCC1=CC=C(C=O)O1 NOEGNKMFWQHSLB-UHFFFAOYSA-N 0.000 claims description 23
- RJGBSYZFOCAGQY-UHFFFAOYSA-N hydroxymethylfurfural Natural products COC1=CC=C(C=O)O1 RJGBSYZFOCAGQY-UHFFFAOYSA-N 0.000 claims description 23
- 238000010438 heat treatment Methods 0.000 claims description 16
- GSNUFIFRDBKVIE-UHFFFAOYSA-N 2,5-dimethylfuran Chemical compound CC1=CC=C(C)O1 GSNUFIFRDBKVIE-UHFFFAOYSA-N 0.000 claims description 12
- 229920001046 Nanocellulose Polymers 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 229910019029 PtCl4 Inorganic materials 0.000 claims description 4
- 229910019891 RuCl3 Inorganic materials 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 238000009901 transfer hydrogenation reaction Methods 0.000 claims description 3
- PTHCMJGKKRQCBF-UHFFFAOYSA-N Cellulose, microcrystalline Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC)C(CO)O1 PTHCMJGKKRQCBF-UHFFFAOYSA-N 0.000 claims description 2
- 229910002666 PdCl2 Inorganic materials 0.000 claims description 2
- 238000001599 direct drying Methods 0.000 claims description 2
- 238000004108 freeze drying Methods 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000001694 spray drying Methods 0.000 claims description 2
- FBEIPJNQGITEBL-UHFFFAOYSA-J tetrachloroplatinum Chemical compound Cl[Pt](Cl)(Cl)Cl FBEIPJNQGITEBL-UHFFFAOYSA-J 0.000 claims description 2
- 230000003197 catalytic effect Effects 0.000 abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052799 carbon Inorganic materials 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 7
- 229910000510 noble metal Inorganic materials 0.000 abstract description 7
- 239000000203 mixture Substances 0.000 description 11
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 10
- QYTDEUPAUMOIOP-UHFFFAOYSA-N TEMPO Chemical class CC1(C)CCCC(C)(C)N1[O] QYTDEUPAUMOIOP-UHFFFAOYSA-N 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
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- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 4
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- 239000007789 gas Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 238000006555 catalytic reaction Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
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- 229910052707 ruthenium Inorganic materials 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 229930091371 Fructose Natural products 0.000 description 2
- RFSUNEUAIZKAJO-ARQDHWQXSA-N Fructose Chemical compound OC[C@H]1O[C@](O)(CO)[C@@H](O)[C@@H]1O RFSUNEUAIZKAJO-ARQDHWQXSA-N 0.000 description 2
- 239000005715 Fructose Substances 0.000 description 2
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 239000002551 biofuel Substances 0.000 description 2
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- 239000008103 glucose Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 101150003085 Pdcl gene Proteins 0.000 description 1
- 229910002837 PtCo Inorganic materials 0.000 description 1
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 125000003172 aldehyde group Chemical group 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- UBEWDCMIDFGDOO-UHFFFAOYSA-N cobalt(II,III) oxide Inorganic materials [O-2].[O-2].[O-2].[O-2].[Co+2].[Co+3].[Co+3] UBEWDCMIDFGDOO-UHFFFAOYSA-N 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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- 239000000835 fiber Substances 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
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- 239000010439 graphite Substances 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- YPDUQZRKTDHPKM-UHFFFAOYSA-N methanol;2-methyloxolane Chemical group OC.CC1CCCO1 YPDUQZRKTDHPKM-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
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- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
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Abstract
本发明涉及催化剂制备技术,旨在提供一种用于HMF转移加氢产生DMF的催化剂的制备方法。包括:搅拌下将纳米微晶纤维素加入去离子水,再加入四甲基哌啶氮氧化物和NaBr;然后加入NaClO溶液,避光条件和磁力搅拌下进行反应,反应体系pH值保持在10.5;pH值不再变化时,加入无水乙醇终止反应,调节pH值至7;用透析袋透析,得到氧化纳米微晶纤维素溶液;用盐酸调节pH值在2‑3,加入柠檬酸钠、属前体化合物,室温搅拌反应6h;透析袋透析5天;样品冷却干燥后氢气氛煅烧;冷却得到产品。本发明,通过煅烧获得具有纳米微晶纤维素多孔空间结构的碳载体;使用贵金属中效果较好且较廉价的Ru作为催化剂,具有成本较低、催化活性好、选择性高、循环效果好的特点。
Description
技术领域
本发明涉及催化剂制备技术领域,尤其是涉及5-羟甲基糠醛催化转化还原成生物质液体燃料2,5-二甲基呋喃的一种催化剂的制备方法。
背景技术
工业革命以来,世界各国大量使用化石资源,导致全球环境污染和气候变暖等现象越来越严重,并且随着不可再生的化石资源储存量的不断减少和价格日益增长,研究化石资源的替代品就显得及其重要,而生物质具有来源广泛、储量丰富、价格低廉和可再生等特点,所以研究发展可再生的生物质资源生产运输燃料以及化学品来逐步替代化石资源已成为当前的研究热点。
生物质经过酸催化水解可转化为葡萄糖或者果糖,葡萄糖和果糖可进一步脱水生成5-羟甲基糠醛(5-hydroxymethyfural,HMF)。HMF是一种重要的平台化合物,它有一个醛基和一个羟基,故很容易转化成一些重要的工业用品。例如,HMF可以制备高品质的液体燃料2,5-二甲基呋喃(2,5-dimethylfuran,DMF),DMF作为一种高品质燃料可用于各种交通工具。DMF与生物燃料乙醇相比,DMF具有更多优点:1)较高的能量密度(30MJ/L),与汽油接近(31MJ/L);2)较高的沸点(92-94℃),不易挥发且可以减少气塞现象同时提高发动机的冷启动性能;3)具有较高的辛烷值(119),防爆性能好;4)不溶于水,易保证油的品质,而生物乙醇与水互溶;5)运动粘度(0.57cSt)与汽油(0.37-0.44cSt)接近,而生物乙醇高达1.5cSt;6)分离过程能耗低,生产成本低。这些优点均使得DMF成为目前非常有前景的生物燃料之一。
目前,DMF主要是通过HMF在催化剂的作用下加氢还原而制得,所用催化剂主要以贵金属为主,包括CuRu/C、Ru/Co3O4、Ru/C、Pd/C、Pt/C、PtCo@HCS等。这些催化剂所用载体对催化剂的催化活性有较重要的影响,目前,所用的载体主要包括碳基载体、SiO2、TiO2、Al2O3、Fe3O4中的一种或多种的混合物,其中碳基载体的实例为活性炭、石墨、碳纳米管、石墨烯中的一种或多种的混合物。
现有催化剂主要以贵金属为主,但贵金属的成本太高。除贵金属外的非贵金属催化剂又存在催化活性低、选择性差等问题。因此,为了尽早提高2,5-二甲基呋喃的市场应用,需要成本较低、催化活性好、选择性高、绿色可持续发展的新型催化剂。
发明内容
本发明要解决的技术问题是,克服现有技术中的不足,提供一种用于HMF转移加氢产生DMF的催化剂的制备方法。
为解决技术问题,本发明的解决方案是:
提供一种用于HMF转移加氢产生DMF的催化剂的制备方法,包括以下步骤:
(1)氧化纳米微晶纤维素的制备
取100mL去离子水,搅拌下加入1.000g纳米微晶纤维素,再加入0.0125g四甲基哌啶氮氧化物和0.125g NaBr,调节溶液的pH值为10-11;然后加入0.298g质量浓度为5%的NaClO溶液,调节pH值为10.5;避光条件和500r/min磁力搅拌下进行反应,反应过程中每隔半小时用0.1mol/L的NaOH溶液调节反应体系的pH值,使之保持在10.5;8h后pH值不再变化时,加入10ml无水乙醇终止反应,继续搅拌30min;以0.1moL/L的HCl溶液调节反应溶液的pH值至7;用截留分子质量8000~14000的透析袋透析5天,得到产物为质量浓度为1%的氧化纳米微晶纤维素溶液;
(2)CNC基催化剂的制备
取100mL的氧化纳米微晶纤维素溶液,用盐酸调节pH值在2-3的范围内,然后加入0.030g柠檬酸钠;在500r/min磁力搅拌下再加入金属前体化合物,室温搅拌反应6h;反应溶液用截留分子质量8000~14000的透析袋透析5天;将得到的样品冷却干燥24h后,放于过管式炉中,通入氢气流量为140ml/min,以0.5℃/min的升温速率加热到400℃,煅烧4h;冷却后,即得到用于HMF转移加氢产生2,5-二甲基呋喃的CNC基催化剂;
所述金属前体化合物是下述的任意一种:0.500g RuCl3与0.452g Cu(NO3)2的混合物;0.500g RuCl3与0.441g Co(NO3)2的混合物;0.812g PtCl4与0.441g Co(NO3)2的混合物;0.500g RuCl3、0.426g PdCl2,或0.812g PtCl4。
本发明中,所述纳米微晶纤维素是固体纳米微晶纤维素或纳米微晶纤维素凝胶;其中,固态纳米微晶纤维素是通过直接干燥、冷冻干燥或喷雾干燥制备获得的。
催化剂的利用方式:
DMF的催化转化还原反应可以按照以下步骤进行:将HMF与溶剂进行混合后加入密闭的高压反应釜中,放入磁子进行搅拌。向混合物中加入本发明的催化剂,安装反应釜。向反应釜中通入氢气进行反应。催化转化还原反应中所述溶剂可以为乙醇、正丙醇、异丙醇、四氢呋喃、甲苯、丙酮中的一种或多种;HMF与溶剂的摩尔比可以为1:1-1:50。HMF与加入催化剂的摩尔比可以为1:0.2-1:10。氢气室温初始压力可以为0.1-10MPa,反应温度为50-300℃;反应时间可以为1-48h;反应物的浓度可以为0.01-1mol/L。
与现有技术相比,本发明的有益效果在于:
1、本发明利用纳米微晶纤维素(Cellulose Nanocrystals,CNC)是以植物纤维为原料制备而来的纳米级材料。纳米纤维素具有高孔隙率,高比表面积以及良好的机械强度等优势。此外,纳米纤维素生产原料具有分布范围广,储量大,可再生等特点,通过煅烧获得具有纳米微晶纤维素多孔空间结构的碳载体,符合当代绿色催化及可持续发展理念。
2、使用贵金属中效果较好且较廉价的Ru作为催化剂,相对于目前已有催化剂,具有成本较低、催化活性好、选择性高、循环效果好以及绿色可持续发展的特点。
具体实施方式
下面结合具体实施例对本发明作进一步阐述,但本发明并不局限于以下实施例,基于本实验中的实施例,本领域普通技术人员在没有做出创新性劳动的前提下获得的所有其他实施例,都属于本发明保护的范围。
本发明中,纳米微晶纤维素(Cellulose Nanocrystals,CNC)是市售产品,产品从Garland Court,UNB Campus,Fredericton处购买。
实施例1:
取100mL去离子水,搅拌下加入1.000g CNC,再加入0.0125g四甲基哌啶氮氧化物(TEMPO)和0.125g NaBr,调节溶液的pH=10-11,再加入0.298g质量浓度为5%的NaClO,调节pH维持在10.5;置于密闭盒内进行避光,磁力搅拌(转速为500r/min),每隔半小时用0.1mol/L的NaOH溶液调节pH,使之保持在10.5;反应8h至pH不再变化;加入10ml无水乙醇终止反应,继续搅拌30min;以0.1moL/L的HCl溶液调节pH值至7;用截留分子质量8000~14000的透析袋透析5天,得到产物为质量浓度为1%的氧化纳米微晶纤维素溶液;取100mL体积的该溶液,用盐酸调节溶液pH值在2-3的范围内(即控制pH值在2.5左右),置于磁力搅拌器上,加入0.030g柠檬酸钠,磁力搅拌(转速为500r/min);再加入0.500g RuCl3和0.452g Cu(NO3)2,室温搅拌6h,用截留分子质量8000~14000的透析袋透析5天,反应完成后冷却干燥24h;将干燥后的样品放于过管式炉中,氢气流量为140ml/min,升温速率为0.5℃/min下加热到400℃条件下煅烧4h得到C基催化剂Ⅰ。
实施例2:
取100mL去离子水,搅拌下加入1.000g CNC,再加入0.0125g TEMPO和0.125gNaBr,调节溶液的pH=10-11,再加入0.298g质量浓度为5%的NaClO,调节pH维持在10.5;置于密闭盒内进行避光,磁力搅拌(转速为500r/min),每隔半小时用0.1mol/L的NaOH溶液调节pH,使之保持在10.5;反应8h至pH不再变化;加入10ml无水乙醇终止反应,继续搅拌30min;以0.1mol/L的HCl溶液调节pH值至7;用截留分子质量8000~14000的透析袋透析5天,得到产物为质量浓度为1%的氧化纳米微晶纤维素溶液;取100mL体积的该溶液,用盐酸调节溶液pH值在2-3的范围内(即控制pH值在2.5左右),置于磁力搅拌器上,加入0.03g柠檬酸钠,磁力搅拌(转速为500r/min);再加入0.500g RuCl3和0.441g Co(NO3)2,室温搅拌6h,用截留分子质量8000~14000的透析袋透析5天,反应完成后冷却干燥24h;将干燥后的样品放于过管式炉中,氢气流量为140ml/min,升温速率为0.5℃/min下加热到400℃条件下煅烧4h得到C基催化剂Ⅱ。
实施例3:
取100mL去离子水,搅拌下加入1.000g CNC,再加入0.0125g TEMPO和0.125gNaBr,调节溶液的pH=10-11,再加入0.298g质量浓度为5%的NaClO,调节pH维持在10.5;置于密闭盒内进行避光,磁力搅拌(转速为500r/min),每隔半小时用0.1mol/L的NaOH溶液调节pH,使之保持在10.5;反应8h至pH不再变化;加入10ml无水乙醇终止反应,继续搅拌30min;以0.1mol/L的HCl溶液调节pH值至7;用截留分子质量8000~14000的透析袋透析5天,得到产物为质量浓度为1%的氧化纳米微晶纤维素溶液;取100mL体积的该溶液,用盐酸调节溶液pH值在2-3的范围内(即控制pH值在2.5左右),置于磁力搅拌器上,加入0.03g柠檬酸钠,磁力搅拌(转速为500r/min);再加入0.500g RuCl3,室温搅拌6h,用截留分子质量8000~14000的透析袋透析5天,反应完成后冷却干燥24h;将干燥后的样品放于过管式炉中,氢气流量为140ml/min,升温速率为0.5℃/min下加热到400℃条件下煅烧4h得到C基催化剂Ⅲ。
实施例4:
取100mL去离子水,搅拌下加入1.000g CNC,再加入0.0125g TEMPO和0.125gNaBr,调节溶液的pH=10-11,再加入0.298g质量浓度为5%的NaClO,调节pH维持在10.5;置于密闭盒内进行避光,磁力搅拌(转速为500r/min),每隔半小时用0.1mol/L的NaOH溶液调节pH,使之保持在10.5;反应8h至pH不再变化;加入10ml无水乙醇终止反应,继续搅拌30min;以0.1mol/L的HCl溶液调节pH值至7;用截留分子质量8000~14000的透析袋透析5天,得到产物为质量浓度为1%的氧化纳米微晶纤维素溶液;取100mL体积的该溶液,用盐酸调节溶液pH值在2-3的范围内(即控制pH值在2.5左右),置于磁力搅拌器上,加入0.03g柠檬酸钠,磁力搅拌(转速为500r/min);再加入0.426g PdCl2,室温搅拌6h,用截留分子质量8000~14000的透析袋透析5天,反应完成后冷却干燥24h;将干燥后的样品放于过管式炉中,氢气流量为140ml/min,升温速率为0.5℃/min下加热到400℃条件下煅烧4h得到C基催化剂Ⅳ。
实施例5:
取100mL去离子水,搅拌下加入1.000g CNC,再加入0.0125g TEMPO和0.125gNaBr,调节溶液的pH=10-11,再加入0.298g质量浓度为5%的NaClO,调节pH维持在10.5;置于密闭盒内进行避光,磁力搅拌(转速为500r/min),每隔半小时用0.1mol/L的NaOH溶液调节pH,使之保持在10.5;反应8h至pH不再变化;加入10ml无水乙醇终止反应,继续搅拌30min;以0.1mol/L的HCl溶液调节pH值至7;用截留分子质量8000~14000的透析袋透析5天,得到产物为质量浓度为1%的氧化纳米微晶纤维素溶液;取100mL体积的该溶液,用盐酸调节溶液pH值在2-3的范围内(即控制pH值在2.5左右),置于磁力搅拌器上,加入0.03g柠檬酸钠,磁力搅拌(转速为500r/min);再加入0.812g PtCl4,室温搅拌6h,用截留分子质量8000~14000的透析袋透析5天,反应完成后冷却干燥24h;将干燥后的样品放于过管式炉中,氢气流量为140ml/min,升温速率为0.5℃/min下加热到400℃条件下煅烧4h得到C基催化剂Ⅴ。
实施例6:
取100mL去离子水,搅拌下加入1.000g CNC,再加入0.0125g TEMPO和0.125gNaBr,调节溶液的pH=10-11,再加入0.298g质量浓度为5%的NaClO,调节pH在10.5;置于密闭盒内进行避光,磁力搅拌(转速为500r/min),每隔半小时用0.1mol/L的NaOH溶液调节pH,使之保持在10.5;反应8h至pH不再变化;加入10ml无水乙醇终止反应,继续搅拌30min;以0.1mol/L的HCl溶液调节pH值至7;用截留分子质量8000~14000的透析袋透析5天,得到产物为质量浓度为1%的氧化纳米微晶纤维素溶液;取100mL体积的该溶液,用盐酸调节溶液pH值在2-3的范围内(即控制pH值在2.5左右),置于磁力搅拌器上,加入0.03g柠檬酸钠,磁力搅拌(转速为500r/min);再加入0.812g PtCl4和0.441g Co(NO3)2,室温搅拌6h,用截留分子质量8000~14000的透析袋透析5天,反应完成后冷却干燥24h;将干燥后的样品放于过管式炉中,氢气流量为140ml/min,升温速率为0.5℃/min下加热到400℃条件下煅烧4h得到C基催化剂Ⅵ。
催化剂催化性能测试:
将0.25g HMF、10mL异丙醇和0.1g本发明实施例1-6制备的催化剂加入到100mL不锈钢密闭反应釜中,用氢气排除空气3次,将所得混合物室温条件下氢气压力为6MPa,在500r/min、160℃下反应8h,经过气相色谱-质谱联用仪检测,原料HMF的转化率以及产品DMF的得率汇总于下表。
对比实施例及数据对比情况:
对比例1
将0.25g HMF、10mL异丙醇和0.1g商业化Ru/C催化剂加入到100mL不锈钢密闭反应釜中,用氢气排除空气3次,将所得混合物室温条件下氢气压力为6MPa,在500r/min、160℃下反应8h,经过气相色谱-质谱联用仪检测,原料HMF的转化率为63.5%以及产品DMF的得率为58.8%。
对比例2
将0.25g HMF、10mL异丙醇和0.1g商业化Pd/C催化剂加入到100mL不锈钢密闭反应釜中,用氢气排除空气3次,将所得混合物室温条件下氢气压力为6MPa,在500r/min、160℃下反应8h,经过气相色谱-质谱联用仪检测,原料HMF的转化率为98%以及产品DMF的得率为8.8%,主要副产物是5-甲基四氢呋喃甲醇,产率达90%。
对比例3
将0.25g HMF、10mL异丙醇和0.1g商业化Pt/C催化剂加入到100mL不锈钢密闭反应釜中,用氢气排除空气3次,将所得混合物室温条件下氢气压力为6MPa,在500r/min、160℃下反应8h,经过气相色谱-质谱联用仪检测,原料HMF的转化率为99%以及产品DMF的得率为69.8%。
由以上实施例和对比例的数据可见,金属催化剂的催化效果是:Ru>Pd>Pt;且同一金属的双金属催化的效果要比单一催化剂效果要好,Ru与Cu双金属催化的效果要比Ru与Co催化效果要好。
由以上对比例可见,本发明以纳米微晶纤维素(Cellulose Nanocrystals,CNC)作为新型载体具有较高的活性和选择性,且催化剂稳定性好,性能比商业化催化剂要好很多,故本发明具有优良的催化性能。
Claims (2)
1.一种用于5-羟甲基糠醛转移加氢产生2,5-二甲基呋喃的催化剂的制备方法,其特征在于,包括以下步骤:
(1)氧化纳米微晶纤维素的制备
取100mL去离子水,搅拌下加入1.000g 纳米微晶纤维素,再加入0.0125g四甲基哌啶氮氧化物和0.125g NaBr,调节溶液的pH值为10-11;然后加入0.298g 质量浓度为5%的NaClO溶液,调节pH值为10.5;避光条件和500r/min磁力搅拌下进行反应,反应过程中每隔半小时用0.1mol/L的NaOH溶液调节反应体系的pH值,使之保持在10.5;8h后pH值不再变化时,加入10ml无水乙醇终止反应,继续搅拌30min;以0.1moL/L的HCl溶液调节反应溶液的pH值至7;用截留分子质量8000~14000的透析袋透析5天,得到产物为质量浓度为1%的氧化纳米微晶纤维素溶液;
(2)CNC基催化剂的制备
取100mL的氧化纳米微晶纤维素溶液,用盐酸调节pH值在2-3的范围内,然后加入0.030g柠檬酸钠;在500r/min磁力搅拌下再加入金属前体化合物,室温搅拌反应6h;反应溶液用截留分子质量8000~14000的透析袋透析5天;将得到的样品冷却干燥24h后,放于管式炉中,通入氢气流量为140ml/min,以0.5℃/min的升温速率加热到400℃,煅烧4h;冷却后,即得到用于5-羟甲基糠醛转移加氢产生2,5-二甲基呋喃的CNC基催化剂;
所述金属前体化合物是下述的任意一种:0.500g RuCl3与0.452g Cu(NO3)2的混合物、0.500g RuCl3与0.441g Co(NO3)2的混合物、0.812g PtCl4与0.441g Co(NO3)2的混合物、0.500g RuCl3、0.426g PdCl2或0.812g PtCl4。
2.根据权利要求1所述的方法,其特征在于,所述纳米微晶纤维素是固体纳米微晶纤维素或纳米微晶纤维素凝胶;其中,固态纳米微晶纤维素是通过直接干燥、冷冻干燥或喷雾干燥制备获得的。
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