CN113698373B - 一种高效光催化氧化制备2,5-呋喃二甲酸的方法 - Google Patents
一种高效光催化氧化制备2,5-呋喃二甲酸的方法 Download PDFInfo
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- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 15
- 230000003647 oxidation Effects 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title claims abstract description 9
- NOEGNKMFWQHSLB-UHFFFAOYSA-N 5-hydroxymethylfurfural Chemical compound OCC1=CC=C(C=O)O1 NOEGNKMFWQHSLB-UHFFFAOYSA-N 0.000 claims abstract description 41
- RJGBSYZFOCAGQY-UHFFFAOYSA-N hydroxymethylfurfural Natural products COC1=CC=C(C=O)O1 RJGBSYZFOCAGQY-UHFFFAOYSA-N 0.000 claims abstract description 41
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- C07D307/00—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
- C07D307/02—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings
- C07D307/34—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
- C07D307/56—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D307/68—Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen
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- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/72—Copper
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Abstract
本发明公开了一种高效光催化氧化制备2,5‑呋喃二甲酸的方法,属于生物质能源化工技术领域。本发明制备了具八面体形状的Cu2O晶体,一种廉价无毒的p型半导体,用于光催化氧化5‑羟甲基糠醛制备2,5‑呋喃二甲酸,以5‑羟甲基糠醛为原料,利用光催化剂,以水为溶剂,在常温下以O2为氧化剂,光照催化得到2,5‑呋喃二甲酸。本发明避免使用贵金属催化剂,反应条件温和,能耗低,反应体系绿色环保,大大降低了本发明的生产成本,副产物少,得率高,制备得到的2,5‑呋喃二甲酸的纯度好。
Description
技术领域
本发明属于生物质能源化工技术领域,具体涉及一种高效光催化氧化制备2,5-呋喃二甲酸的方法。
背景技术
在全球经济快速发展和石油资源日益枯竭的大背景下,特别是以化石资源为基础的传统化学工业不具有可持续性,且会造成全球变暖和环境污染问题,因此,寻找可再生、可持续的传统化石资源替代品为当务之急。生物质来源于自然,是世界上最丰富的可再生资源之一,全球年产量达1000亿吨,被认为是一种独特而有前途的候选资源。5-羟甲基糠醛(HMF)是C6碳水化合物的脱水产物,作为一种重要的生物质平台化合物,以HMF为原料,通过水解、聚合、卤化、酯化、加氢以及氧化还原等反应可得到一系列的高价值的糠醛衍生物。其中催化氧化产物2,5-呋喃二甲酸(FDCA)具有环结构和多功能性的双酸性侧链,与传统石油基单体对苯二甲酸(PTA)的分子结构类似,故可作为PTA的替代品来合成制造聚酰胺、聚酯和聚脲,既能减少环境污染,又能节约生产成本。特别是合成生物基聚酯,如通过FDCA和乙二醇可有效合成聚2,5-呋喃甲酸酯,具有很好的热化学性能及生物降解性,是替代石油基聚合物聚对苯二甲酸乙酯(PET)的不二之选。同时FDCA还被研究发现用于医药、有机合成和构建生物金属有机框架。
FDCA具有重要的应用价值和广阔的市场发展前景,合成制备方法已得到广泛研究,分别是以不同原料为起点,例如HMF、糠酸、呋喃、二甘醇酸和己糖二酸等来制备FDCA。而目前HMF氧化制备FDCA研究得最为深入和广泛,产率也较高,是最有希望实现工业化生产的制备方法。
研究最为广泛的是热催化氧化中的金属负载催化,其中负载贵金属研究最多,主要以Pt、Pd、Ru、Au为主,但存在催化剂价格昂贵,成本高的问题,而非贵金属主要以Co、Fe、Mn为主,其余催化方式以电催化居多,光催化目前应用于HMF氧化制备FDCA的研究报道较少。李振环等人在中国专利CN106279080A中,以HMF为原料,利用Fe2O3、SrTiO3、C3N4等为催化剂,以水为溶剂,在光照下,以光催化分解水产生的氧气或过氧化氢为氧化剂,对HMF进行选择性氧化制备FDCA。虽然反应体系环境友好,绿色无污染,但反应体系需要额外加热。张超等人在中国专利CN109107605A中以四甲基季铵盐、四乙基季铵盐、四丙基季铵盐、四丁基季铵盐为阳离子的十聚钨酸铵盐作为催化剂,纯氧气为氧化剂,利用可见光对HMF进行氧化。该方法虽催化剂制备方法简单,但以乙腈作为反应介质,加入盐酸作为酸性促进剂,反应体系较复杂,且目标产物FDCA得率较低。
发明内容
针对上述现有技术中存在的反应需要额外加热,或是反应体系较复杂,需要以有机溶剂作为反应介质,加入反应促进剂的不足,本发明拟解决的技术问题是,提供一种高效光催化氧化HMF制备FDCA的方法。以HMF为原料,利用Cu2O作为光催化剂,以水为溶剂,在常温下以O2为氧化剂,对HMF进行选择性氧化制备FDCA。反应体系环境友好,绿色无污染。
一种高效光催化氧化制备2,5-呋喃二甲酸的方法,其特征在于,包括以下步骤:
S1:以5-羟甲基糠醛为底物,加以光催化剂;
S2:在常温下直接以O2为氧化剂,采用日光氙灯光源,对5-羟甲基糠醛选择性氧化制备2,5-呋喃二甲酸;
优选的,所述光催化剂为具八面体形状的p型半导体Cu2O;
优选的,所述5-羟甲基糠醛:光催化剂:溶剂的质量比为1:0.397-0.992:396.825-992.063;
优选的,所述S2中无需额外加热,反应时间为12-20h;
优选的,所述S2中O2压力为0.5-2MPa;
优选的,所述具八面体形状的p型半导体Cu2O的制备方法包括以下步骤:
S1:称取0.2660g CuCl2·2H2O和0.1405g C6H12O6溶于100mL去离子水中;
S2:将溶液转移到三口烧瓶中,水浴加热到75℃;
S3:在磁力搅拌条件下,向溶液中滴加0.42mol/L的NaOH溶液,直至将溶液pH调至12.1,后继续保温搅拌1h;
S4:将所得沉淀物过滤后,用去离子水洗涤几次,并在55℃条件下烘干24h,即可得到八面体形状的纳米级Cu2O晶体。
本发明的有益效果是:
1)采用可见光进行光催化氧化反应,取代了传统的热催化反应,节约了能源。
2)在过量碱及葡萄糖作用下,通过还原氯化铜而得到具有八面体形状的纳米级Cu2O晶体,制备方法简单,成本低,代替了传统的贵金属催化剂,大大降低了成本。
3)反应体系仅以水为溶剂,不添加任何促进剂,且在室温下进行,体系结构简单,绿色环保,反应条件温和。
具体实施方式
下面结合具体实施方式,对本发明作进一步说明。
实施例1
将50.4mg HMF、20mg Cu2O催化剂和20mL去离子水加入光催化反应釜,充入O2压力0.5MPa,转速600rpm,磁力搅拌10min后,可见光照射12h反应完毕。经检测,HMF的转化率达到73.8%,FDCA的得率为19.1%。
实施例2
将50.4mg HMF、20mg Cu2O催化剂和20mL去离子水加入光催化反应釜,充入O2压力1MPa,转速600rpm,磁力搅拌10min后,可见光照射12h反应完毕。经检测,HMF的转化率达到74.6%,FDCA的得率为38.9%。
实施例3
将50.4mg HMF、20mg Cu2O催化剂和35mL去离子水加入光催化反应釜,充入O2压力1MPa,转速600rpm,磁力搅拌10min后,可见光照射12h反应完毕。经检测,HMF的转化率达到75.3%,FDCA的得率为40.1%。
实施例4
将50.4mg HMF、20mg Cu2O催化剂和50mL去离子水加入光催化反应釜,充入O2压力1MPa,转速600rpm,磁力搅拌10min后,可见光照射12h反应完毕。经检测,HMF的转化率达到72.9%,FDCA的得率为38.4%。
实施例5
将50.4mg HMF、20mg Cu2O催化剂和20mL去离子水加入光催化反应釜,充入O2压力1.5MPa,转速600rpm,磁力搅拌10min后,可见光照射12h反应完毕。经检测,HMF的转化率达到74.8%,FDCA的得率为59.8%。
实施例6
将50.4mg HMF、20mg Cu2O催化剂和20mL去离子水加入光催化反应釜,充入O2压力2MPa,转速600rpm,磁力搅拌10min后,可见光照射12h反应完毕。经检测,HMF的转化率达到71.8%,FDCA的得率为65.1%。
实施例7
将50.4mg HMF、30mg Cu2O催化剂和20mL去离子水加入光催化反应釜,充入O2压力2MPa,转速600rpm,磁力搅拌10min后,可见光照射12h反应完毕。经检测,HMF的转化率达到90.1%,FDCA的得率为82.3%。
实施例8
将50.4mg HMF、40mg Cu2O催化剂和20mL去离子水加入光催化反应釜,充入O2压力2MPa,转速600rpm,磁力搅拌10min后,可见光照射12h反应完毕。经检测,HMF的转化率达到94.4%,FDCA的得率为86.8%。
实施例9
将50.4mg HMF、50mg Cu2O催化剂和20mL去离子水加入光催化反应釜,充入O2压力2MPa,转速600rpm,磁力搅拌10min后,可见光照射12h反应完毕。经检测,HMF的转化率达到98.3%,FDCA的得率为91.6%。
实施例10
将50.4mg HMF、50mg Cu2O催化剂和20mL去离子水加入光催化反应釜,充入O2压力2MPa,转速600rpm,磁力搅拌10min后,可见光照射16h反应完毕。经检测,HMF的转化率达到98.8%,FDCA的得率为94.9%。
实施例11
将50.4mg HMF、50mg Cu2O催化剂和20mL去离子水加入光催化反应釜,充入O2压力2MPa,转速600rpm,磁力搅拌10min后,可见光照射20h反应完毕。经检测,HMF的转化率达到98.7%,FDCA的得率为88.1%。
Claims (1)
1.一种高效光催化氧化制备2,5-呋喃二甲酸的方法,其特征在于,包括以下步骤:
S1:以5-羟甲基糠醛为底物,加以光催化剂;
S2:在常温下直接以O2为氧化剂,采用日光氙灯光源,对5-羟甲基糠醛选择性氧化制备2,5-呋喃二甲酸;
所述光催化剂为具八面体形状的p型半导体Cu2O;
所述5-羟甲基糠醛:光催化剂:溶剂的质量比为1:0.397-0.992:396.825-992.063;
所述S2中无需额外加热,反应时间为12-20h;
所述S2中O2压力为0.5-2MPa;
所述具八面体形状的p型半导体Cu2O的制备方法包括以下步骤:
S1:称取0.2660gCuCl2·2H2O和0.1405gC6H12O6溶于100mL去离子水中;
S2:将溶液转移到三口烧瓶中,水浴加热到75℃;
S3:在磁力搅拌条件下,向溶液中滴加0.42mol/L的NaOH溶液,直至将溶液pH调至12.1,后继续保温搅拌1h;
S4:将所得沉淀物过滤后,用去离子水洗涤几次,并在55℃条件下烘干24h,即可得到八面体形状的纳米级Cu2O晶体。
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