CN109420493A - 碳载贵金属催化剂催化苯乙炔加氢制备苯乙烯的方法 - Google Patents
碳载贵金属催化剂催化苯乙炔加氢制备苯乙烯的方法 Download PDFInfo
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- CN109420493A CN109420493A CN201710751158.6A CN201710751158A CN109420493A CN 109420493 A CN109420493 A CN 109420493A CN 201710751158 A CN201710751158 A CN 201710751158A CN 109420493 A CN109420493 A CN 109420493A
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- phenylacetylene
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- acid
- styrene
- carbon
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- UEXCJVNBTNXOEH-UHFFFAOYSA-N Ethynylbenzene Chemical group C#CC1=CC=CC=C1 UEXCJVNBTNXOEH-UHFFFAOYSA-N 0.000 title claims abstract description 132
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 title claims abstract description 91
- 239000003054 catalyst Substances 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 39
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 29
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 238000005984 hydrogenation reaction Methods 0.000 title claims abstract description 24
- 229910000510 noble metal Inorganic materials 0.000 title claims abstract description 15
- 238000006555 catalytic reaction Methods 0.000 title claims description 6
- 239000002253 acid Substances 0.000 claims abstract description 11
- 239000003575 carbonaceous material Substances 0.000 claims abstract description 10
- 229910052751 metal Inorganic materials 0.000 claims abstract description 10
- 239000002184 metal Substances 0.000 claims abstract description 10
- 238000001035 drying Methods 0.000 claims abstract description 6
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 30
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 21
- 239000001257 hydrogen Substances 0.000 claims description 10
- 229910052739 hydrogen Inorganic materials 0.000 claims description 10
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 9
- 239000012298 atmosphere Substances 0.000 claims description 9
- 229910052763 palladium Inorganic materials 0.000 claims description 9
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 8
- 239000010931 gold Substances 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 8
- 229910052737 gold Inorganic materials 0.000 claims description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 6
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 6
- VLTRZXGMWDSKGL-UHFFFAOYSA-N perchloric acid Chemical compound OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 claims description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 6
- 239000002243 precursor Substances 0.000 claims description 6
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical group [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 claims description 4
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 4
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- PHTQWCKDNZKARW-UHFFFAOYSA-N isoamylol Chemical compound CC(C)CCO PHTQWCKDNZKARW-UHFFFAOYSA-N 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 229910017604 nitric acid Inorganic materials 0.000 claims description 4
- 239000003960 organic solvent Substances 0.000 claims description 4
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- 230000009467 reduction Effects 0.000 claims description 4
- 229910052709 silver Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 3
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- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 claims description 3
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- 238000011068 loading method Methods 0.000 claims description 3
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- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 claims description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 2
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 claims description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 2
- 229910052786 argon Inorganic materials 0.000 claims description 2
- 238000001802 infusion Methods 0.000 claims description 2
- 229910052741 iridium Inorganic materials 0.000 claims description 2
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 claims description 2
- 239000012046 mixed solvent Substances 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 238000011084 recovery Methods 0.000 claims description 2
- 229910052703 rhodium Inorganic materials 0.000 claims description 2
- 239000010948 rhodium Substances 0.000 claims description 2
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 claims description 2
- 229910052707 ruthenium Inorganic materials 0.000 claims description 2
- 239000004332 silver Substances 0.000 claims description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims 1
- 229910002651 NO3 Inorganic materials 0.000 claims 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims 1
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- 230000003197 catalytic effect Effects 0.000 abstract description 3
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- YNQLUTRBYVCPMQ-UHFFFAOYSA-N Ethylbenzene Chemical compound CCC1=CC=CC=C1 YNQLUTRBYVCPMQ-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
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- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 3
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- 150000001336 alkenes Chemical class 0.000 description 2
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- 150000002431 hydrogen Chemical class 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000005749 Copper compound Substances 0.000 description 1
- 102000002322 Egg Proteins Human genes 0.000 description 1
- 108010000912 Egg Proteins Proteins 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 229910002666 PdCl2 Inorganic materials 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
- 230000009471 action Effects 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
- 230000008901 benefit Effects 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000011203 carbon fibre reinforced carbon Substances 0.000 description 1
- 150000001805 chlorine compounds Chemical group 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 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
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
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- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
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- B01J37/349—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation making use of flames, plasmas or lasers
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Abstract
碳载贵金属催化剂催化苯乙炔加氢制备苯乙烯的方法,该方法中具体涉及:以酸处理过的碳材料为载体,与贵金属盐等体积浸渍,烘干后进行等离子体还原,制备担载型金属催化剂。该合成方法具有普适性,利用等离子体还原能够避免催化剂制备过程中金属的流失,且该方法中不使用任何对环境不友好的还原剂,操作简单,易于放大合成,所得的碳载贵金属催化剂可直接应用于苯乙炔加氢制备苯乙烯,苯乙炔的转化率高达99%,苯乙烯的产率高达95%,循环催化剂的收率高,催化效果稳定。
Description
技术领域
本发明涉及一种选择性加氢催化剂,具体说是碳载贵金属催化剂 催化苯乙炔加氢制备苯乙烯的方法。
背景技术
苯乙烯是生产聚苯乙烯、ABS树脂和丁苯橡胶的的重要单体,生 产苯乙烯主要靠乙苯脱氢,然而单靠此技术已经远远不能满足市场对 苯乙烯的需要。为了进一步降低生产成本,从裂解制乙烯副产碳八馏 分中抽提生产苯乙烯已成为一条增产苯乙烯的新途径。但碳八馏分中 含有少量(3000~7000μg g-1)的苯乙炔,苯乙炔的存在会影响聚合产 品的颜色、气味等综合性能。为此,需将苯乙炔脱除,以达到聚合级 苯乙烯对原料中苯乙炔含量的要求。由于苯乙炔加氢产物有半加氢的 苯乙烯和完全加氢生成乙苯,因此,需通过催化剂的研发提高苯乙炔 的转化率和苯乙烯的选择性。研究人员将蛋壳型的结构担载在金属氧化物上,使其在载体外表面充分分散,以用于抑制苯乙炔的富加氢成 苯乙烷,该方法中将PdCl2溶于乙醇中,通入CO,促进Pd在SiO2-Al2O3上的吸附。担载量为0.4wt%的Pd担载型催化剂的苯乙炔转化率为 65%,苯乙烯的选择性为98.9%(ChemCatChem 2010(2):1555-1558)。 该方法中使用了毒性气体CO,且苯乙炔的转化率有待提高。Hu等报 道了Pd在载体上的颗粒大小对活性和选择性的影响。其中,利用 NaBH4和PVP作为还原剂和保护剂调控Pd的浓度,采用浸渍法制备 纳米Pd/α-Al2O3。通过调变还原剂和保护剂的用量得到Pd粒径在3.8~12.1nm之间,结果显示五次重复性实验发现Pd的含量没有下降, 且苯乙炔的转化率和苯乙烯的选择性均没有下降,说明催化剂的稳定 性较好(J.Mol.Cat.A:Chem.2014,381:61-69)。尽管催化剂的稳定性 较好,但合成过程中使用了对环境不友好的还原剂,另外,稳定剂等 的加入使合成的过程更加复杂。中国发明专利(公开号:CN1852877A) 公开了在θ氧化铝上还原的铜化合物,尽管使用过渡金属降低催化剂 的成本,然而该专利的技术反应温度较高,苯乙炔的转化率在70% 左右,且该催化剂的使用寿命短,苯乙烯的损失率也较高。为了简化 催化剂的合成过程,常温下原位制备担载型的贵金属催化剂,本专利 涉及将金属盐与商业碳材料进行浸渍,经等离子体原位还原,制备系 列担载型贵金属催化剂,该合成过程简单、可行、易放大。重要的是 合成过程中不使用任何对环境有害的还原剂和表活剂等,反应温度温 和,所得催化剂在苯乙炔加氢中能够提高苯乙炔的转化率,使其达到99%,大大提高了苯乙烯的选择性,使其达到95%。
发明内容
本发明提供了一种催化效率高,易于大规模合成,商业碳材料担 载的贵金属催化剂的制备及其在苯乙炔半加氢制备苯乙烯。
碳载贵金属催化剂催化苯乙炔加氢制备苯乙烯的方法具体涉及: 以酸处理过的碳材料为载体,与贵金属盐等体积浸渍,烘干后进行等 离子体还原,制备担载型金属催化剂。所得的担载型催化剂与苯乙炔 进行混合并分散在有机溶剂中,在高压反应釜中进行反应,半加氢制 备苯乙烯。
所述的碳材料为炭黑、碳球、碳管中的一种及两种以上的混合物。
所述的酸为硫酸、碳酸、硝酸、盐酸、磷酸、高氯酸或氢氟酸中 的一种或两种以上的混合酸;酸的浓度为0.1-5M,优选0.5-3M。
所述的金属前驱体为金、钌、铑、银、铱、钯或铂中一种或二种 以上的氯化物,硝酸盐,碳酸盐和醋酸盐中的一种或两种以上的混合 物。
所述的还原气氛为氩气、氮气、氧气或氢气中的一种或两种以上 的混合气体。
所述的等离子体的还原参数为极板间电压为两电极间的功率为 25-200W,优选50-100W;电压为200-1500V,优选200-500V;还 原时间为5-60min,优选5-30min;等离子体中的环境温度为25-80 ℃,优选25-50℃;罐体的旋转速率为10-200rpm,优选10-60rpm。
所述的有机溶剂为甲醇、氯仿、甲苯、乙醇、异丙醇、苯、异戊 醇中的一种或两种以上的混合溶剂。
所述的催化剂与苯乙炔的摩尔比为0.01-1%,优选0.01-0.05%。
与现有技术相比,本发明具有如下的优势:
本发明通过等离子还原技术制备担载型贵金属催化剂,可原位将 金属颗粒还原担载到商业碳材料上。本发明涉及的合成方法中避免贵 金属前驱体的流失,且使用旋转铝罐,使得金属盐得到充分还原,制 备分散性好,尺寸均一,颗粒厚度小的担载型催化剂;涉及的合成过 程中避免使用对环境不友好的还原剂、稳定剂以及表活剂,合成路线 简单可行,适合大规模合成,涉及的催化剂的制备方法具有广阔的发 展空间和市场应用价值,完全符合目前我国可持续发展的要求。
附图说明
图1.实施例1~5制备所得产物苯乙炔半加氢制备苯乙烯的活性对比 图。
图2.实施例1制备所得产物在不同金属与底物的摩尔比下的活性对 比图。
图3.实施例1制备所得催化剂在苯乙炔半加氢制备苯乙烯的反应中 的循环性能测试。
具体实施方式
实施例1制备0.5wt%Pd/碳球
1)用1M的盐酸和3M的硝酸依次洗涤商业碳球,充分搅拌6h后, 抽滤,水洗,烘干,待用。
2)将5.5mg的Pd(NO3)2溶于2mL的水中置于25mL烧杯中,再加 入500mg的1)中处理后的碳球,200rpm下搅拌20min后,放入 真空干燥箱内,室温真空过夜干燥。将干燥后的样品放入铝罐中,旋 转速率为60rpm,在25℃,50W,200V,H2气氛下进行还原15min, 制备0.5wt%Pd/碳球。
实施例2~5
采用实施例1的方法制备催化剂,不同的是改变贵金属前驱体盐, 分别制备0.5wt%Au/碳球,0.5wt%Ag/碳球,0.5wt%Pt/碳球和合金 0.25wt%Au-0.25wt%Pd/碳球。
实施例6~9
采用实施例1的方法制备催化剂,不同的是处理商业碳球的酸及浓 度,分别制备0.5M硫酸,5M硝酸,0.1M高氯酸和5M碳酸。
实施例10~11
采用实施例1的方法制备催化剂,不同的是处理商业碳材料类型,分 别使用商业的炭黑和碳管。
实施例12~16
采用实施例1的方法制备催化剂,不同的是改变等离子体还原的参 数,分别为在25℃,100W,200V,H2气氛下进行还原;在40℃, 150W,500V,Ar气氛下进行还原15min;在50℃,150W,300V, N2气氛下进行还原30min;在80℃,100W,500V,H2气氛下进行 还原60min;在80℃,50W,200V,H2气氛下进行还原120min; 在30℃,50W,200V,O2气氛下进行还原180min。
实施例17~21
采用实施例1的方法制备催化剂,不同的是改变金属钯的载量,分别 为0.1,0.25,1,5和10wt%。
实施例22
在反应釜中,将实施例1中制备的催化剂与苯乙炔按照Pd与底物 的摩尔比为0.05%的量分散到甲苯中,充入氢气,至压力为0.5MPa, 在40℃下,反应1h。
所得数据如图1所示,Pd/C的催化剂的苯乙炔的转化率达99%, 苯乙烯的选择性为95%。
实施例23~27
采用实施例22的方法进行苯乙炔半反应选择性加氢,不同的是将 实施例2~5中所制得的催化剂进行反应,所得数据如图1所示。相比 于Pd/C催化剂,加入金之后,合金AuPd/C的苯乙炔的转化率略有 下降,达95%,苯乙烯的选择性为88%,说明金的加入并未对Pd/C 催化剂半加氢的活性所有帮助。含有其他金属的催化剂,如:Au/C, Ag/C,Pt/C的苯乙炔加氢的转化率和苯乙烯的选择性都远不如Pd/C 的催化活性。
实施例28~31
采用实施例22的方法进行苯乙炔半反应选择性加氢,不同的是将 实施例1中所制得的催化剂按照不同的钯与底物的浓度比进行反应, 所得数据如图2所示。结果显示,钯与底物的浓度比低于0.5%时, 其苯乙炔的转化率和苯乙烯的选择性都较低,当钯与底物的浓度比为 0.5%时,苯乙炔的转化率和苯乙烯的选择性最高,当钯与底物的浓度 比高于0.5%时,其活性降低较明显。
实施例32~36
采用实施例22的方法进行苯乙炔半反应选择性加氢,不同的是将 实施例1中所制得的催化剂进行反复的循环测试,所得数据如图3所 示。循环次数进行五次,每次的苯乙炔的转化率和苯乙烯的选择性都 较稳定,催化剂的损失较少,说明该催化剂的循环稳定性较好。
实施例37~40
采用实施例22的方法进行苯乙炔半反应选择性加氢,不同的是将 实施例6~9所制备的催化剂进行苯乙炔加氢制备苯乙炔,实施例6的 催化剂的苯乙炔的转化率为85%,苯乙烯的选择性为66%;实施例7 的催化剂的苯乙炔的转化率为90%,苯乙烯的选择性为73%;实施例 8的苯乙炔的转化率为95%,苯乙烯的选择性为69%;实施例9的苯 乙炔的转化率为98%,苯乙烯的选择性为90%。
实施例41~42
采用实施例22的方法进行苯乙炔半反应选择性加氢,不同的是将 实施例10~11所制备的催化剂进行苯乙炔加氢制备苯乙炔,实施例 10的催化剂的苯乙炔的转化率为95%,苯乙烯的选择性为88%;实 施例11的催化剂的苯乙炔的转化率为92%,苯乙烯的选择性为89%。
实施例43~47
采用实施例22的方法进行苯乙炔半反应选择性加氢,不同的是将 实施例12~16所制备的催化剂进行苯乙炔加氢制备苯乙炔,实施例 12的催化剂的苯乙炔的转化率为90%,苯乙烯的选择性为86%;实 施例13的催化剂的苯乙炔的转化率为92%,苯乙烯的选择性为87%; 实施例14的苯乙炔的转化率为95%,苯乙烯的选择性为89%;实施 例15的苯乙炔的转化率为98%,苯乙烯的选择性为91%,实施例16 的苯乙炔的转化率为95%,苯乙烯的选择性为92%。
实施例48~52
采用实施例22的方法进行苯乙炔半反应选择性加氢,不同的是将 实施例17~21所制备的催化剂进行苯乙炔加氢制备苯乙炔,实施例 17的催化剂的苯乙炔的转化率为85%,苯乙烯的选择性为79%;实 施例18的催化剂的苯乙炔的转化率为90%,苯乙烯的选择性为86%; 实施例19的苯乙炔的转化率为95%,苯乙烯的选择性为93%;实施 例20的苯乙炔的转化率为98%,苯乙烯的选择性为85%,实施例21 的苯乙炔的转化率为99%,苯乙烯的选择性为68%。
对比文件1
制备方法与实施例1相似,不同的是商业碳球未经过第一步的酸 处理,而是直接将商业碳球进行浸渍,还原,担载。所得的催化剂按 照实施例22进行苯乙炔加氢的反应,结果发现,对比文件1中所得 的催化剂的苯乙炔的转化率高达99%,但苯乙烯的选择性仅为25%。 与实施例22中实施例1所制备的催化剂活性相比,该现象充分说明, 经处理的商业碳球对金属进行担载后对苯乙炔加氢活性的影响很大。
Claims (8)
1.碳载贵金属催化剂催化苯乙炔加氢制备苯乙烯的方法,其特征在于:
碳载贵金属催化剂按照以下步骤制备获得:
1)将碳材料在酸中进行处理,搅拌,抽滤,水洗,烘干待用;
2)采用浸渍法进行贵金属前驱体于碳载体上的负载过程,将1)中处理后的碳材料与金属前驱体溶液进行混合搅拌5-60min,经真空干燥箱过夜烘干后得样品,样品中金属前驱体的担载量为0.1-10wt%,优选0.1-5wt%;将样品置于可旋转的罐体中,进行等离子体还原,制备担载型贵金属或合金催化剂;
在加氢反应体系中,将2)中制备的催化剂与苯乙炔进行混合并分散在有机溶剂,放入高压反应釜中,在300-1000rpm下进行搅拌,釜体压力为0.1-10MPa,优选0.5-5MPa,温度为25-150℃,优选25-80℃,反应0.1-24h,优选0.5-12h。
2.根据权利要求1所述的方法,其特征在于:所述的碳材料为炭黑、碳球、碳管中的一种及两种以上的混合物。
3.根据权利要求1所述的方法,其特征在于:所述的酸为硫酸、碳酸、硝酸、盐酸、磷酸、高氯酸或氢氟酸中的一种或两种以上的混合酸;酸的浓度为0.1-5M,优选0.5-3M。
4.根据权利要求1所述的方法,其特征在于:所述的金属前驱体为金、钌、铑、银、铱、钯或铂中一种或二种以上的氯化物,硝酸盐,碳酸盐和醋酸盐中的一种或两种以上的混合物。
5.根据权利要求1所述的方法,其特征在于:所述的等离子体还原气氛为氩气、氮气、氧气或氢气中的一种或两种以上的混合气体。
6.根据权利要求1所述的方法,其特征在于:所述的等离子体的还原参数为极板间电压为两电极间的功率为25-200W,优选50-100W;电压为200-1500V,优选200-500V;还原时间为5-60min,优选5-30min;等离子体中的环境温度为25-80℃,优选25-50℃;罐体的旋转速率为10-200rpm,优选10-60rpm。
7.根据权利要求1所述的方法,其特征在于:所述的有机溶剂为甲醇、氯仿、甲苯、乙醇、异丙醇、苯、异戊醇中的一种或两种以上的混合溶剂。
8.根据权利要求1所述的方法,其特征在于:催化剂与苯乙炔的摩尔比为0.01-1%,优选0.01-0.05%。
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