CN111760577A - 一种乙炔氢氯化制氯乙烯大比表面积催化剂的制备方法 - Google Patents
一种乙炔氢氯化制氯乙烯大比表面积催化剂的制备方法 Download PDFInfo
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Abstract
本发明公开一种Au‑Sn‑Co/AAC催化剂在制备方法,并用于乙炔氢氯化反应。采用3g超级活性炭(比表面积在2500m2/g到3000m2/g)用浓盐酸在室温搅拌清洗3小时,得到悬浮液经过过滤并且用二次水洗涤,直至到达PH≈7,得到的超级活性炭在60℃下干燥15个小时来充当载体。将一定量的HAuCl4•4H2O、SnCl2和Co(NH3)6Cl3溶于二次水中,配成浸渍液,向超级活性炭中边搅拌边滴加浸渍液,得到的样品在30℃下超声40min,在室温下浸渍40小时,最后在管式炉中氮气气氛150℃‑160℃下焙烧24小时,得到乙炔氢氯化制氯乙烯催化剂样品,催化剂样品中金占活性炭载体的百分比为0.25%,锡和钴分别占1‑5%,将该催化剂应用于乙炔氢氯化反应其乙炔转化率达到90%,氯乙烯的选择性高达99.8%。
Description
技术领域
本发明涉及一种乙炔氢氯化制氯乙烯大比表面积催化剂的制备方法,特别指一种具有良好乙炔转化率,氯乙烯选择性和热稳定性的乙炔氢氯化制氯乙烯的金-锡-钴三元催化剂。
背景技术
聚氯乙烯(PVC)作为全球五大工程塑料之一,目前工业上通常通过C2H2法,C2H4法等来合成。2018年我国石油对外进口依存度超过70%,天然气对外依存度也攀升到45.3%。这给C2H4法制备氯乙烯带来了巨大的挑战,也给以煤基乙炔法带来了机遇。然而煤基乙炔法因其高耗能、高污染一直不被人们接受。随着技术的发展高耗能这一问题得到了有效限制,然而目前行业普遍使用8-13wt%Hg/AC催化剂,汞催化剂带来的污染一直没有解决,因此开发一种非汞催化剂已迫在眉睫,早在1985年,Hutchings发现Au/AC催化剂在乙炔氢氯化反应中表现出非常好的活性,随后众多研究者围绕Au催化剂展开了广泛研究,主要从两个方面进行,一方面加入助剂另一方面通过改性活性炭载体,研究者研究了Au-Bi/AC,Au-Cu/AC,Au-Sn/AC,Au-Co-Cu/AC,Au-La/AC,Au-Co/AC,Au-Co-K/AC,Au-Y/AC等催化剂用于乙炔氢氯化反应,与此同时围绕载体方面也进行了大量研究有Au/SiC,Au-Bi/Al2O3,P/B/N等杂原子改性活性炭也取得了很大的进步,然而到目前为止离工业化应用还有很大距离,因此本发明采用不同比例的Au/Sn/Co活性组分负载到大比表面积(2500-3000m2/g)活性炭制的Au-Sn-Co/AAC三元催化剂在乙炔氢氯化反应中表现出良好的催化活性和稳定性,为早日实现工业化应用做基础。
发明内容
本发明要解决的技术问题是提供一种乙炔氢氯化制氯乙烯大比表面积催化剂的制备方法。将该催化剂应用于乙炔氢氯化制氯乙烯反应,具有较高的乙炔转化率,氯乙烯选择性和良好的热稳定性。
本发明催化剂的制备方法采用等体积浸渍法,首先将3g超级活性炭(比表面积在2500m2/g到3000m2/g)用浓盐酸在室温搅拌清洗3小时,得到悬浮液经过过滤并且用二次水洗涤,直至到达PH ≈ 7,得到的超级活性炭在60℃下干燥15个小时来充当载体。将一定量的 HAuCl4•4H2O、SnCl2和Co(NH3)6Cl3溶于二次水中,配成浸渍液,向超级活性炭中边搅拌边滴加浸渍液,得到的样品在30℃下超声40min,在室温下浸渍40小时,最后在管式炉中氮气气氛150℃-160℃下焙烧24小时,得到乙炔氢氯化制氯乙烯催化剂样品,催化剂样品中金占活性炭载体的百分比为0.25%,锡和钴分别占5%,将该催化剂应用于乙炔氢氯化反应其乙炔转化率达到90%,氯乙烯的选择性高达99.8%。
本发明的催化剂在乙炔氢氯化制氯乙烯反应中取得较好的催化效果。具体实验操作:乙炔氢氯化反应活性测试实验在固定床反应器中进行,10ml催化剂样品填装在反应器中。开始实验前采用氮气置换反应器,使反应器中氧气含量小于10ppm,然后用氯化氢气体边置换氮气边升温直至温度达到160℃,升温速率5℃/小时。取样分析反应器中氮气含量小于10ppm后,同时通入乙炔和氯化氢,乙炔和氯化氢进反应器前采用分子筛出去水分,反应气乙炔和氯化氢流量分别为20ml/min和25ml / min。产物出去水分和氯化氢后,采用气相色谱分析组分。催化性能采用乙炔(XA)的转化率和对VCM(SVC)的选择性作为评价标准,用下式进行计算:XA = (φA0-φAl)/ φA0 × 100 %和SVC = φVC / (φA0-φAl) × 100 %。其中φA0,φAl和φVC分别表示原料气体中乙炔的体积分数,剩余乙炔的体积分数和VCM的体积分数。
本发明的优点是:制备出一种乙炔氢氯化制氯乙烯大比表面积催化剂,具有较好的催化活性、对氯乙烯选择性较高、寿命长、制备方法简单,成本低廉等特点。
本发明的实质性特征是:
采用等体积浸渍法制备大比表面催化剂催化剂,该催化剂用于乙炔氢氯化制氯乙烯催化反应,乙炔转化率和氯乙烯选择性分别为90%和99.8%。
1. 采用等体积浸渍法制备的大表面积催化剂,超级活性炭和锡钴助剂的加入提高了活性组分的分散度,活性组分与助剂之间强的相互作用提高了催化剂的活性和稳定性,同时降低了催化剂的成本。
2. 本发明催化剂的制备方法采用等体积浸渍法,首先将3g超级活性炭(比表面积在2500到3000m2/g)用浓盐酸在室温搅拌清洗3小时,得到悬浮液经过过滤并且用二次水洗涤,直至到达PH ≈ 7,得到的超级活性炭在60℃下干燥15个小时来充当载体。将一定量的HAuCl4•4H2O、SnCl2和Co(NH3)6Cl3溶于二次水中,配成浸渍液,向超级活性炭中边搅拌边滴加浸渍液,得到的样品在30℃下超声40min,在室温下浸渍40小时,最后在管式炉中氮气气氛150℃-160℃下焙烧24小时,得到乙炔氢氯化制氯乙烯催化剂样品,催化剂样品中金占活性炭载体的百分比为0.25%,锡和钴分别占5%,将该催化剂应用于乙炔氢氯化反应其乙炔转化率达到90%,氯乙烯的选择性高达99.8%。
附图说明
图1是乙炔氢氯化制氯乙烯大比表面积催化剂的活性测试图。
表1不同催化剂乙炔氢氯化制氯乙烯的催化活性及比表面积测试结果。
具体实施方式
实施例1:本发明催化剂的制备方法采用等体积浸渍法,首先将3g超级活性炭(比表面积在2500到3000)用浓盐酸在室温搅拌清洗3小时,得到悬浮液经过过滤并且用二次水洗涤,直至到达PH ≈ 7,得到的超级活性炭在60℃下干燥15个小时来充当载体。将一定量的 HAuCl4•4H2O、SnCl2和Co(NH3)6Cl3溶于二次水中,配成浸渍液,向超级活性炭中边搅拌边滴加浸渍液,得到的样品在30℃下超声40min,在室温下浸渍40小时,最后在管式炉中氮气气氛150℃-160℃下焙烧24小时,得到乙炔氢氯化制氯乙烯催化剂样品,催化剂样品中金占活性炭载体的百分比为0.25%,锡和钴分别占5%,将该催化剂应用于乙炔氢氯化反应其乙炔转化率达到90%,氯乙烯的选择性高达99.0%,该催化剂记为Au0.25%-5Sn-5Co /AAC。
实施例2:催化剂的制备方法采用例1,取一定量的HAuCl4•4H2O、SnCl2和Co(NH3)6Cl3配成浸渍液,制的Au0.25%-1Sn-5Co /AAC。
实施例3:催化剂的制备方法采用例1,取一定量的HAuCl4•4H2O、SnCl2和Co(NH3)6Cl3配成浸渍液,制的Au0.25%-1Sn-3Co /AAC。
实施例4:催化剂的制备方法采用例1,取一定量的HAuCl4•4H2O、SnCl2和Co(NH3)6Cl3配成浸渍液,制的Au0.25%-1Sn-1Co /AAC。
实施例5:催化剂的制备方法采用例1,取一定量的HAuCl4•4H2O、SnCl2和Co(NH3)6Cl3配成浸渍液,制的Au0.25%-3Sn-1Co /AAC。
实施例6:催化剂的制备方法采用例1,取一定量的HAuCl4•4H2O、SnCl2和Co(NH3)6Cl3配成浸渍液,制的Au0.25%-5Sn-1Co /AAC。
Claims (2)
1.本发明催化剂的制备方法采用等体积浸渍法,首先将3g超级活性炭(比表面积在2500到3000)用浓盐酸在室温搅拌清洗3小时,得到悬浮液经过过滤并且用二次水洗涤,直至到达PH ≈ 7,得到的超级活性炭在60℃下干燥15个小时来充当载体。
2.将一定量的 HAuCl4•4H2O、SnCl2和Co(NH3)6Cl3溶于二次水中,配成浸渍液,向超级活性炭中边搅拌边滴加浸渍液,得到的样品在30℃下超声40min,在室温下浸渍40小时,最后在管式炉中氮气气氛150℃-160℃下焙烧24小时,得到乙炔氢氯化制氯乙烯催化剂样品,催化剂样品中金占活性炭载体的百分比为0.25%,锡和钴分别占5%,将该催化剂应用于乙炔氢氯化反应其乙炔转化率达到90%,氯乙烯的选择性高达99.8%。
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