CN109012723A - 核壳结构Pd-Co/CN@SiO2纳米催化剂的制备方法 - Google Patents
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- 239000011943 nanocatalyst Substances 0.000 title claims abstract description 13
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/24—Nitrogen compounds
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- C—CHEMISTRY; METALLURGY
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- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C209/00—Preparation of compounds containing amino groups bound to a carbon skeleton
- C07C209/30—Preparation of compounds containing amino groups bound to a carbon skeleton by reduction of nitrogen-to-oxygen or nitrogen-to-nitrogen bonds
- C07C209/32—Preparation of compounds containing amino groups bound to a carbon skeleton by reduction of nitrogen-to-oxygen or nitrogen-to-nitrogen bonds by reduction of nitro groups
- C07C209/36—Preparation of compounds containing amino groups bound to a carbon skeleton by reduction of nitrogen-to-oxygen or nitrogen-to-nitrogen bonds by reduction of nitro groups by reduction of nitro groups bound to carbon atoms of six-membered aromatic rings in presence of hydrogen-containing gases and a catalyst
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C213/00—Preparation of compounds containing amino and hydroxy, amino and etherified hydroxy or amino and esterified hydroxy groups bound to the same carbon skeleton
- C07C213/02—Preparation of compounds containing amino and hydroxy, amino and etherified hydroxy or amino and esterified hydroxy groups bound to the same carbon skeleton by reactions involving the formation of amino groups from compounds containing hydroxy groups or etherified or esterified hydroxy groups
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D215/00—Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems
- C07D215/02—Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen atoms or carbon atoms directly attached to the ring nitrogen atom
- C07D215/16—Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen atoms or carbon atoms directly attached to the ring nitrogen atom 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
- C07D215/38—Nitrogen atoms
- C07D215/40—Nitrogen atoms attached in position 8
Abstract
本发明公开了一种核壳结构Pd‑Co/CN@SiO2纳米催化剂的制备方法。所述方法先将六水合硝酸钴、氯亚钯酸钾、2‑甲基咪唑混合反应制备钯负载的钴基金属有机框架Pd2+/ZIF‑67,再将Pd2+/ZIF‑67与2‑甲基咪唑、十六烷基三甲基氯化铵和硅酸四乙酯反应,在Pd2+/ZIF‑67表面包裹二氧化硅后煅烧制得Pd‑Co/CN@SiO2催化剂。本发明制得的核壳结构Pd‑Co/CN@SiO2纳米催化剂,SiO2壳的包覆能有效防止Pd‑Co纳米颗粒的团聚,并且能防止催化反应中金属颗粒的流失,从而提高催化活性,能够实现常温常压下硝基化合物的加氢还原,条件温和,实用性强,易于操作,且催化剂具有磁性,便于回收,可循环利用。
Description
技术领域
本发明属于纳米金属催化剂技术领域,涉及一种核壳结构Pd-Co/CN@SiO2纳米催化剂的制备方法。
背景技术
取代氨基化合物作为重要的化工中间体,被广泛用于合成药物、农药、有机颜料、涂料、聚合物等。它们一般是通过还原相应的硝基化合物制得。目前常用的还原方法有:铁粉或者硫化碱还原法,硼氢化钠、水合肼、甲酸、加氢还原法等。铁粉或者硫化碱还原过程中会产生大量的三废,环境污染大,对设备的腐蚀严重。用硼氢化钠、水合肼、甲酸作还原剂时,尽管这类还原剂选择性好,但是往往存在腐蚀性较强的问题,对设备的要求高,不利于工业化生产。因此在工业上更倾向于用氢气作还原剂,氢气广泛易得,且副产物是水,对环境友好。
硝基化合物加氢是制备氨基化合物的一种常用方法。X.Sun等(Journal ofCatalysis 357(2018)20–28)报道了一种钴纳米分散在多孔氮掺杂石墨上的材料,Co@mesoNC,该催化体系对多种含硝基的化合物有良好的催化活性,但是其需要在383K,3MPa条件下才能实现转化。Eckardt M等(Scientific Reports,2018,8(1))制备了一种具有活性钴纳米粒子的氮掺杂石墨材料,该催化剂能选择性地将多种硝基化合物还原为氨基化合物,但是它也需要较高的温度和压力(363K和4MPa),对设备有较高要求,不利于工业化生产,而且存在金属纳米易烧结和流失的问题。S Zhang等(Chemical Communications,2017,53(68):9490)制备了一种二氧化硅负载钯纳米颗粒的催化剂Pd/SiO2,由于二氧化硅具有很大的比表面积和孔隙度,使钯纳米颗粒可以很均匀地分散于载体上。
发明内容
本发明的目的在于提供一种核壳结构Pd-Co/CN@SiO2纳米催化剂的制备方法。该方法先将钯负载的钴基金属有机框架包裹二氧化硅,再经煅烧,制得核壳结构Pd-Co/CN@SiO2纳米催化剂。
实现本发明目的技术方案如下:
核壳结构Pd-Co/CN@SiO2纳米催化剂的制备方法,包括以下步骤:
步骤1,按六水合硝酸钴、氯亚钯酸钾、2-甲基咪唑的摩尔比为1:0.05~0.2:58,将六水合硝酸钴、氯亚钯酸钾、2-甲基咪唑溶液混合,搅拌反应,离心,分离得到钯负载的钴基金属有机框架Pd2+/ZIF-67;
步骤2,将Pd2+/ZIF-67超声分散在水和无水乙醇的混合液中,依次加入2-甲基咪唑、十六烷基三甲基氯化铵(CTAC)和硅酸四乙酯后搅拌,水解反应得到Pd2+/ZIF-67@SiO2;
步骤3,将Pd2+/ZIF-67@SiO2在N2氛围下缓慢升温至750~850℃煅烧2~4h,得到核壳结构Pd-Co/CN@SiO2纳米催化剂。
优选地,步骤1中,所述的搅拌反应时间为24h以上。
优选地,步骤2中,所述的水和无水乙醇的混合液中,水和无水乙醇的体积比为1~1.65:1。
优选地,步骤2中,所述的2-甲基咪唑、十六烷基三甲基氯化铵和硅酸四乙酯的质量比为1:0.55:1.12~1.87。
优选地,步骤3中,煅烧温度为800℃。
与现有技术相比,本发明具有以下优点:
(1)本发明制得的核壳结构Pd-Co/CN@SiO2纳米催化剂,其以Pd-Co/CN核,以SiO2为壳,SiO2壳的包覆能有效防止Pd-Co纳米颗粒的团聚,并且能防止催化反应中金属颗粒的流失,从而提高催化活性;
(2)本发明制得的核壳结构Pd-Co/CN@SiO2纳米催化剂,能够实现常温常压下硝基化合物的加氢还原,条件温和,实用性强,易于操作,且催化剂具有磁性,便于回收,可循环利用。
附图说明
图1为Pd-Co/CN@SiO2催化剂X-射线光电子能谱(XPS)的扫描全图(a)、Pd 3d图谱(b)、Co 2p图谱(c)。
图2为Pd2+/ZIF-67(a)、实施例1中Pd-Co/CN@SiO2(b)和图b在不同放大倍数(c)的扫描电子显微图片。
图3为实施例8催化剂循环次数与转化率、产率的关系图。
具体实施方式
下面结合实施例和附图对本发明作进一步详述。
实施例1
将0.45g Co(NO3)2·6H2O、0.05g K2PdCl4溶于3ml去离子水中,5.5g 2-MeIM溶于20ml去离子水中,将两种溶液混合后搅拌24h,过滤、烘干得到钯负载的钴基金属有机框架Pd2+/ZIF-67。取30mg钯负载的钴基金属有机框架Pd2+/ZIF-67分散在33ml去离子水和20ml无水乙醇的混合液中,加入250mg 2-甲基咪唑,超声10min后加入0.55ml25%CTAC水溶液,搅拌20min后加入0.4ml硅酸四乙酯,2h后过滤、干燥。将得到的物质放入管式炉中,N2氛围下缓慢升温至800℃煅烧4h,得到核壳结构Pd-Co/CN@SiO2纳米催化剂。
图1为该催化剂X-射线光电子能谱图,图b是Pd的3d图谱,从图上可知键的两个主峰的结合能分别为335.66ev和340.88ev,分别对应着Pd 3d 5/2和Pd 3d 3/2,和零价Pd的结合能基本一致。图c是Co的2p图谱,从图上可知键的两个主峰的结合能分别为Co 2p 3/2的780.28ev和Co 2p 1/2的796.42ev,这与文献中报道的PdCo合金和金属Co的数据非常吻合。
该实施例中金属Pd和Co的含量由电感耦合等离子体质谱(ICP-MS)检测,最后得到Pd的含量为1.37%,Co的含量为37.06%。
图2为Pd2+/ZIF-67(a)、实例1中Pd-Co/CN@SiO2(b)和图b在不同放大倍数(c)的扫描电子显微图片。由图片可以看出煅烧后的催化剂保持了MOF原有的形貌和尺寸,所制得的催化剂是一种核壳结构,即二氧化硅壳中包裹PdCo合金负载的CN。
实施例2
与实施例1基本相同,只是将煅烧温度改为750℃。
实施例3
与实施例1基本相同,只是将煅烧温度改为850℃。
实施例4
与实施例1基本相同,只改变K2PdCl4的加入量为0.025g。
实施例5
与实施例1基本相同,只改变K2PdCl4的加入量为0.1g。
实施例6
分别在50ml圆底烧瓶中加入1mmol不同的硝基化合物(硝基苯、邻氯硝基苯、间氯硝基苯、对甲氧基硝基苯、2,4-二硝基氯苯、8-硝基喹啉)、10ml EtOH:H2O=2:1的溶液、30mg实施例1所得的催化剂,超声1min,用真空泵抽出瓶内的空气后用氢气球通入氢气,反应在25℃、1atm H2下搅拌进行。反应进程通过TLC检测。反应完离心,上层清液经乙醚萃取、无水硫酸钠干燥后,通过气相色谱检测底物的转化率,产物结构均经层析柱分离后,通过核磁检测。结果如表1所示。
对比例1
与实施例1基本相同,只是未加入K2PdCl4,制得的催化剂记作Co/CN@mesoSiO2。
对比例2
与实施例1基本相同,只是将Co(NO3)2·6H2O换成Zn(NO3)2·6H2O,制得的催化剂记作Pd/CN@mesoSiO2。
对比例3
与实施例1基本相同,只是将煅烧温度改为700℃。
对比例4
与实施例1基本相同,只是将煅烧温度改为900℃。
实施例7
分别在50ml圆底烧瓶中加入1mmol硝基苯、10ml EtOH:H2O=2:1的溶液、30mg各实施例和对比例所得的催化剂,超声1min,用真空泵抽出瓶内的空气后用氢气球通入氢气,反应在25℃、1atm大气压下进行。反应进程通过TLC检测。反应完离心,上层清液经乙醚萃取、无水硫酸钠干燥后,通过气相色谱检测底物的转化率,产物结构均经层析柱分离后,通过核磁检测。
不同实施例及对比例的转化率和产率结果见表1:
表1各实施例及对比例的转化率和产率
结果表明,实施例1所得的催化剂对各种硝基化合物的加氢还原有良好的催化效果,反应1h底物的转化率均大于99%,不同底物的产率不同,而纯Co和纯Pd催化剂的催化效果分别为5%和53%,这表明Pd是该反应的活性中心,而Co的存在提供了更多的活性中心,将两者复合提高了催化剂的反应活性,即两者之间有着良好的协同催化效果。
实施例8
将实施例1制得的催化剂循环使用,具体步骤为:反应完后离心收集催化剂,用无水乙醇洗涤三次之后放入50℃真空干燥箱过夜烘干。催化性能测试操作及步骤与实施例6相同。结果图3所示:结果表明,该催化剂循环六次后,转化率和产率均没有明显降低。
Claims (5)
1.核壳结构Pd-Co/CN@SiO2纳米催化剂的制备方法,其特征在于,包括以下步骤:
步骤1,按六水合硝酸钴、氯亚钯酸钾、2-甲基咪唑的摩尔比为1:0.05~0.2:58,将六水合硝酸钴、氯亚钯酸钾、2-甲基咪唑溶液混合,搅拌反应,离心,分离得到钯负载的钴基金属有机框架Pd2+/ZIF-67;
步骤2,将Pd2+/ZIF-67超声分散在水和无水乙醇的混合液中,依次加入2-甲基咪唑、十六烷基三甲基氯化铵(CTAC)和硅酸四乙酯后搅拌,水解反应得到Pd2+/ZIF-67@SiO2;
步骤3,将Pd2+/ZIF-67@SiO2在N2氛围下缓慢升温至750~850℃煅烧2~4h,得到核壳结构Pd-Co/CN@SiO2纳米催化剂。
2.根据权利要求1所述的制备方法,其特征在于,步骤1中,所述的搅拌反应时间为24h以上。
3.根据权利要求1所述的制备方法,其特征在于,步骤2中,所述的水和无水乙醇的混合液中,水和无水乙醇的体积比为1~1.65:1。
4.根据权利要求1所述的制备方法,其特征在于,步骤2中,所述的2-甲基咪唑、十六烷基三甲基氯化铵和硅酸四乙酯的质量比为1:0.55:1.12~1.87。
5.根据权利要求1所述的制备方法,其特征在于,步骤3中,煅烧温度为800℃。
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