CN108295801B - 一种深度脱硫的负载型Pd基双金属吸附剂及其制备方法 - Google Patents
一种深度脱硫的负载型Pd基双金属吸附剂及其制备方法 Download PDFInfo
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Abstract
一种深度脱硫的负载型Pd基双金属吸附剂,它一种由直径为4~5nm、长达数微米的纳米线交错缠绕在纳米氧化铝载体上,与载体紧密结合的呈三维纳米线网状结构的Pd基双金属吸附剂。上述负载型Pd基双金属吸附剂的制备方法主要采用液相原位还原法,首先对载体改性后得到羟基纳米氧化铝载体;然后浸入到由硝酸盐金属盐溶液和稳定剂曲拉通X‑114组成的混合溶液,搅拌混合均匀,利用静电吸附,使金属离子吸附到羟基纳米氧化铝载体表面;加入还原剂,即可制得Pd‑M双金属/γ‑Al2O3吸附剂。本发明制备的吸附剂具有长段光滑的线性吸附表面、结构稳定、脱硫效果好;同时制备工艺简单,反应条件温和,环境友好,操作方便,重复性高。
Description
技术领域
本发明涉及一种吸附剂及其制备方法。
背景技术
苯是重要的石油化工基本原料之一,其生产技术水平和产量已经成为衡量一个国家化工发展水平的重要标志之一。我国焦化苯资源极为丰富,约占国内苯总产量的48%。但焦化苯成分复杂,含有一定的杂质,其中以含硫化合物为主,较难脱除。尤其是噻吩类物质,因和苯的物理、化学性质很相似,脱除最为困难。在苯作为原料生产顺丁烯二酸酐和环己烯的过程中,微量存在的噻吩就会严重降低催化剂的活性、选择性和使用寿命。常常需要将焦化苯中噻吩含量严格控制在ppb级,因而解决苯中噻吩类有机硫化物的脱除问题至关重要。
要实现苯深度脱硫,行之有效的脱硫技术必不可少,而每一种脱硫技术的核心之一则是高效脱硫剂的研发,目前已开发成熟的深度脱硫工艺有加氢、萃取、吸附等。吸附脱硫技术因其高效率、低成本、反应条件温和、反应装置简单、环境污染小等诸多优势得到了广泛关注。吸附脱硫技术最关键的是高效脱硫吸附剂的开发与研究。因为金属Pd和噻吩类硫化物之间强的相互作用和对噻吩良好的选择性,目前工业用苯深度脱硫吸附剂的活性组分普遍采用贵金属钯,通过添加不同助剂,从而改善吸附剂的脱硫深度及硫容。近年来,张红等公布了一种用于精苯深度脱硫的吸附剂(CN 103041766 A;2013.04.01)。以Pd为活性组分,以钾钠镧改性的氧化铝为载体,采用浸渍法制备,能将原料苯中的总硫从1ppm降到0.01ppm以下,硫容量高达0.898噻吩/Kg吸附剂。张峰开发了一种苯精制脱硫的钯吸附剂的制备方法(CN 103480325 A;2014.01.01),以Pd为活性组分,以氧化铝为载体,采用浸渍法,通过浸渍、旋转蒸发、烘干、焙烧等步骤制备出来苯脱硫钯吸附剂,该吸附剂的硫容可达0.90g噻吩/kg催化剂。
由于钯是贵金属,资源缺乏,价格昂贵,但为了增加吸附剂的噻吩吸附容量,就需要提高吸附剂上钯的含量,考虑到实际工业中的经济性,这无疑提高了生产成本。另,现有的负载型Pd吸附剂制备方法主要是浸渍法,制备过程中需要焙烧,容易造成Pd粒子吸附剂生长和聚集,导致吸附活性面积下降,不利于对噻吩的吸附。因此,寻求一种好的制备工艺或对吸附剂改性获得价格相对便宜的高效苯深度脱硫吸附剂是十分必要的。
发明内容
本发明针对现有技术中存在的不足,提出一种低成本、三维纳米线网状结构、具有深度脱硫性能的负载型Pd基双金属吸附剂及其制备方法。本发明主要是通过在单金属Pd吸附剂中引入第二种金属,形成双金属改性吸附剂,利用不同金属间的相互作用,产生新的协同效应,从而有效改善吸附剂的吸附性能。
本发明的深度脱硫负载型Pd基双金属吸附剂是一种直径为4~5nm、长达数微米的纳米线交错缠绕在纳米氧化铝载体上,与载体紧密结合的呈三维纳米线网状结构的Pd基双金属吸附剂。
本发明的制备方法包括如下步骤:
(1)纳米氧化铝载体表面羟基化处理
按每10mL蒸馏水加入0.1g的纳米三氧化二铝比例,将纳米三氧化二铝和蒸馏水放入三口烧瓶中,将其加热至80~110℃后,按氨水与蒸馏水的体积比为1:100的比例,加入氨水,搅拌1~3h,制得羟基纳米氧化铝载体;
(2)制备负载型Pd基双金属/γ-Al2O3吸附剂
配置质量浓度为0.25~3%的曲拉通X-114水溶液,超声分散备用;按照摩尔比为0.5~3:1称取硝酸钯(Pd(NO3)2)和过渡金属硝酸盐放入容器中,加入超纯水,配制成金属盐总浓度为10~40mM的混合金属盐溶液;按照曲拉通X-114溶液与混合金属盐溶液的体积比为1~9:1,将上述混合金属盐溶液与曲拉通溶液混合均匀,置于0~45℃水浴锅中搅拌;向上述混合溶液中加入与金属盐质量比为66~199:1的羟基纳米氧化铝,磁力搅拌20~30min使其与溶液混匀;按NaBH4水溶液与曲拉通X-114的体积比为1~3:1的比例,将浓度为1~2.5mg/mL的NaBH4水溶液迅速倒入金属溶液中,搅拌0.15~3min后静置3~15min,用乙醇和水的混合液,离心洗涤5~6次,在70~100℃下干燥,即可得到负载型Pd基双金属/γ-Al2O3吸附剂。
所述过渡金属硝酸盐为Ni(NO3)2或Co(NO3)2。
所述负载型Pd基双金属/γ-Al2O3吸附剂为Pd-Ni/γ-Al2O3或Pd-Co/γ-Al2O3。
本发明与现有技术相比具有如下优点:
1、利用静电吸附机理令离子先吸附到载体表面,再通过原位还原,一步即可使吸附剂负载到载体上,制备工艺简单,条件温和,无需高温焙烧,可有效控制吸附剂的尺寸和结构。
2、开发出低成本负载型Pd基双金属吸附脱硫剂。因用相对廉价的过渡金属取代部分Pd,较工业用脱硫剂,Pd用量减少了约50%,降低了吸附脱硫剂的成本;同时双金属的协同作用使得多种吸附作用在同一吸附剂中体现,显著提高了吸附剂的深度脱硫性能。
3、三维纳米线网状结构的Pd基吸附脱硫剂具有长段光滑的吸附表面、结构稳定、可自支撑,相比于普通粒子,具有与载体的作用力大,稳定性强等优点。
4、高脱硫率的Pd基双金属吸附脱硫剂可使噻吩-苯溶液由300ppb降至10ppb以下,脱硫率达95%以上,较工业脱硫剂提高了1.40倍。由此证明该吸附剂在苯精制领域有着广阔的应用前景。
附图说明
图1为本发明载体纳米三氧化二铝的低倍数TEM图;
图2为本发明实施例3制备的负载型三维网状Pd-Ni/γ-Al2O3吸附剂的低倍数TEM图;
图3为本发明实施例7制备的负载型三维网状Pd-Co/γ-Al2O3吸附剂的低倍数TEM图;
具体实施方式
实施例1
(1)纳米氧化铝载体表面羟基化处理
称取0.98g的纳米三氧化二铝于三口烧瓶中,加入98mL蒸馏水,将其加热至80℃后加入0.98mL的氨水溶液,并在此温度下搅拌1h,停止搅拌,制得羟基纳米氧化铝载体;
(2)制备负载型Pd-Ni双金属/γ-Al2O3吸附剂
将曲拉通X-114配置成质量浓度为0.25%的水溶液,超声分散备用;按照摩尔比为0.5:1称取硝酸钯(Pd(NO3)2)和硝酸镍(Ni(NO3)2)于烧杯中,加入20ml的超纯水,配制成金属盐总浓度为10mM的混合金属盐溶液;按照曲拉通X-114溶液与混合金属盐溶液的体积比为1:1,将上述混合金属盐溶液与曲拉通溶液混合均匀,置于0℃水浴锅中搅拌;向上述混合溶液中加入与金属盐质量比为66:1的羟基纳米氧化铝,磁力搅拌20min使其与溶液混匀。按NaBH4水溶液与曲拉通X-114的体积比为1:1的比例,将新配制的浓度为1mg/mL的NaBH4水溶液迅速倒入金属溶液中,搅拌0.15min停止,后静置3min,用乙醇和水的混合液,离心洗涤5次,在70℃下干燥,即可得到负载型Pd-Ni双金属/γ-Al2O3吸附剂。
如图1所示,从图中可以看到大量的粒状结构,由此可以断定纳米氧化铝是由20nm左右的无定型颗粒状组成的。该材料尺寸小,大小均匀,既可以使催化剂均匀分散到上边,也可以对Pd基双金属吸附剂起到有效支撑作用。
实施例2
(1)纳米氧化铝载体表面羟基化处理
称取2.68g的纳米三氧化二铝于三口烧瓶中,加入268mL蒸馏水,将其加热至90℃后加入2.68mL的氨水溶液,并在此温度下搅拌2h,停止搅拌,制得羟基纳米氧化铝载体;
(2)制备负载型Pd-Ni双金属/γ-Al2O3吸附剂
将曲拉通X-114配置成质量浓度为1%的水溶液,超声分散备用;按照摩尔比为2:1称取硝酸钯(Pd(NO3)2)和硝酸镍(Ni(NO3)2)于烧杯中,加入15ml的超纯水,配制成金属盐总浓度为20mM的混合金属盐溶液;按照曲拉通X-114溶液与混合金属盐溶液的体积比为2:1,将上述混合金属盐溶液与曲拉通溶液混合均匀,置于20℃水浴锅中搅拌;向上述混合溶液中加入与金属盐质量比为99:1的羟基纳米氧化铝,磁力搅拌25min使其与溶液混匀;按NaBH4水溶液与曲拉通X-114的体积比为2.3:1的比例,将新配制的浓度为1.25mg/mL的NaBH4水溶液迅速倒入金属溶液中,搅拌1min停止,后静置10min,用乙醇和水的混合液,离心洗涤6次,在90℃下干燥,即可得到负载型Pd-Ni双金属/γ-Al2O3吸附剂。
实施例3
(1)纳米氧化铝载体表面羟基化处理
称取2.44g的纳米三氧化二铝于三口烧瓶中,加入244mL蒸馏水,将其加热至95℃后加入2.44mL的氨水溶液,并在此温度下搅拌2h,停止搅拌,制得羟基纳米氧化铝载体;
(2)制备负载型Pd-Ni双金属/γ-Al2O3吸附剂
将曲拉通X-114配置成质量浓度为0.5%的水溶液,超声分散备用;按照摩尔比为1:1称取硝酸钯(Pd(NO3)2)和硝酸镍(Ni(NO3)2)于烧杯中,加入10ml的超纯水,配制成金属盐总浓度为30mM的混合金属盐溶液;按照曲拉通X-114溶液与混合金属盐溶液的体积比为1.5:1,将上述混合金属盐溶液与曲拉通溶液混合均匀,置于30℃水浴锅中搅拌;向上述混合溶液中加入与金属盐质量比为99:1的羟基纳米氧化铝,磁力搅拌25min使其与溶液混匀;按NaBH4水溶液与曲拉通X-114的体积比为2:1的比例,将新配制的浓度为2mg/mL的NaBH4水溶液迅速倒入金属溶液中,搅拌1min停止,后静置10min,用乙醇和水的混合液,离心洗涤5次,在80℃下干燥,即可得到负载型Pd-Ni双金属/γ-Al2O3吸附剂。
如图2所示,可以看出三维网状纳米线均匀分散在纳米氧化铝中,并且保持了原有的形貌,纳米线并没有断裂,并且粒径分布均匀、分散度高,从而可以说明改性后的氧化铝对纳米材料可以起到良好的支撑作用。
实施例4
(1)纳米氧化铝载体表面羟基化处理
称取3.75g的纳米三氧化二铝于三口烧瓶中,加入375mL蒸馏水,将其加热至110℃后加入3.75mL的氨水溶液,并在此温度下搅拌3h,停止搅拌,制得羟基纳米氧化铝载体;
(2)制备负载型Pd-Ni双金属/γ-Al2O3吸附剂
将曲拉通X-114配置成质量浓度为3%的水溶液,超声分散备用;按照摩尔比为3:1称取硝酸钯(Pd(NO3)2)和硝酸镍(Ni(NO3)2)于烧杯中,加入5ml的超纯水,配制成金属盐总浓度为40mM的混合金属盐溶液;按照曲拉通X-114溶液与混合金属盐溶液的体积比为9:1,将上述混合金属盐溶液与曲拉通溶液混合均匀,置于45℃水浴锅中搅拌。向上述混合溶液中加入与金属盐质量比为199:1的羟基纳米氧化铝,磁力搅拌30min使其与溶液混匀。按NaBH4水溶液与曲拉通X-114的体积比为3:1的比例,将新配制的浓度为2.5mg/mL的NaBH4水溶液迅速倒入金属溶液中,搅拌3min停止,后静置15min,用乙醇和水的混合液,离心洗涤6次,在100℃下干燥,即可得到负载型Pd-Ni双金属/γ-Al2O3吸附剂。
实施例5
(1)纳米氧化铝载体表面羟基化处理
称取2.95g的纳米三氧化二铝于三口烧瓶中,加入295mL蒸馏水,将其加热至80℃后加入2.95mL的氨水,并在此温度下搅拌1h,停止搅拌,制得羟基纳米氧化铝载体;
(2)制备负载型Pd-Co双金属/γ-Al2O3吸附剂
将曲拉通X-114配置成质量浓度为0.25%的水溶液,超声分散备用;按照摩尔比为0.5:1称取硝酸钯(Pd(NO3)2)和硝酸钴(Co(NO3)2)于烧杯中,加入5ml的超纯水,配制成金属盐总浓度为40mM的混合金属盐溶液;按照曲拉通X-114溶液与混合金属盐溶液的体积比为9:1,将上述混合金属盐溶液与曲拉通溶液混合均匀,置于0℃水浴锅中搅拌。向上述混合溶液中加入与金属盐质量比为199:1的羟基纳米氧化铝,磁力搅拌20min使其与溶液混匀。按NaBH4水溶液与曲拉通X-114的体积比为1:1的比例,将新配制的浓度为1.75mg/mL的NaBH4水溶液迅速倒入金属溶液中,搅拌0.15min停止,后静置3min,用乙醇和水的混合液,离心洗涤5次,在70℃下干燥,即可得到负载型Pd-Co双金属/γ-Al2O3吸附剂。
实施例6
(1)纳米氧化铝载体表面羟基化处理
称取1.67g的纳米三氧化二铝于三口烧瓶中,加入167mL蒸馏水,将其加热至105℃后加入1.67mL的氨水溶液,并在此温度下搅拌2h,停止搅拌,制得羟基纳米氧化铝载体;
(2)制备负载型Pd-Co双金属/γ-Al2O3吸附剂
将曲拉通X-114配置成质量浓度为2%的水溶液,超声分散备用;按照摩尔比为2:1称取硝酸钯(Pd(NO3)2)和硝酸钴(Co(NO3)2)于烧杯中,加入8ml的超纯水,配制成金属盐总浓度为35mM的混合金属盐溶液;按照曲拉通X-114溶液与混合金属盐溶液的体积比为7:1,将上述混合金属盐溶液与曲拉通溶液混合均匀,置于25℃水浴锅中搅拌。向上述混合溶液中加入与金属盐质量比为66:1的羟基纳米氧化铝,磁力搅拌25min使其与溶液混匀。按NaBH4水溶液与曲拉通X-114的体积比为2.5:1的比例,将新配制的浓度为1mg/mL的NaBH4水溶液迅速倒入金属溶液中,搅拌2min停止,后静置10min,用乙醇和水的混合液,离心洗涤5次,在90℃下干燥,即可得到负载型Pd-Co双金属/γ-Al2O3吸附剂。
实施例7
(1)纳米氧化铝载体表面羟基化处理
称取3.46g的纳米三氧化二铝于三口烧瓶中,加入346mL蒸馏水,将其加热至95℃后加入346mL的氨水溶液,并在此温度下搅拌2h,停止搅拌,制得羟基纳米氧化铝载体;
(2)制备负载型Pd-Co双金属/γ-Al2O3吸附剂
将曲拉通X-114配置成质量浓度为0.5%的水溶液,超声分散备用;按照摩尔比为1:1称取硝酸钯(Pd(NO3)2)和硝酸钴(Co(NO3)2)于烧杯中,加入17ml的超纯水,配制成金属盐总浓度为25mM的混合金属盐溶液;按照曲拉通X-114溶液与混合金属盐溶液的体积比为1:1,将上述混合金属盐溶液与曲拉通溶液混合均匀,置于30℃水浴锅中搅拌。向上述混合溶液中加入与金属盐质量比为99:1的羟基纳米氧化铝,磁力搅拌25min使其与溶液混匀。按NaBH4水溶液与曲拉通X-114的体积比为1.5:1的比例,将新配制的浓度为1.5mg/mL的NaBH4水溶液迅速倒入金属溶液中,搅拌0.5min停止,后静置10min,用乙醇和水的混合液,离心洗涤6次,在80℃下干燥,即可得到负载型Pd-Co双金属/γ-Al2O3吸附剂。
如图3所示,从图中可以看出吸附剂的形貌与Pd-Ni/γ-Al2O3吸附剂形同,Pd-Co三维网状纳米线均匀分散在纳米氧化铝中,并且保持了原有的形貌,纳米线并没有断裂,并且粒径分布均匀、分散度高,说明改性后的氧化铝对纳米材料可以起到良好的支撑作用。
实施例8
(1)纳米氧化铝载体表面羟基化处理
称取2.80g的纳米三氧化二铝于三口烧瓶中,加入280mL蒸馏水,将其加热至110℃后加入2.80mL的氨水溶液,并在此温度下搅拌3h,停止搅拌,制得羟基纳米氧化铝载体;
(2)制备负载型Pd-Co双金属/γ-Al2O3吸附剂
将曲拉通X-114配置成质量浓度为3%的水溶液,超声分散备用;按照摩尔比为3:1称取硝酸钯(Pd(NO3)2)和硝酸钴(Co(NO3)2)于烧杯中,加入20ml的超纯水,配制成金属盐总浓度为15mM的混合金属盐溶液;按照曲拉通X-114溶液与混合金属盐溶液的体积比为3:1,将上述混合金属盐溶液与曲拉通溶液混合均匀,置于45℃水浴锅中搅拌。向上述混合溶液中加入与金属盐质量比为99:1的羟基纳米氧化铝,磁力搅拌30min使其与溶液混匀。按NaBH4水溶液与曲拉通X-114的体积比为3:1的比例,将新配制的浓度为2.5mg/mL的NaBH4水溶液迅速倒入金属溶液中,搅拌3min停止,后静置15min,用乙醇和水的混合液,离心洗涤5次,在100℃下干燥,即可得到负载型Pd-Co双金属/γ-Al2O3吸附剂。
如表1所示,可以看出当反应0.5h时,负载型三维网状Pd-Ni/γ-Al2O3吸附剂可使噻吩-苯溶液由300ppb降至10ppb以下,脱硫率达95%以上,而工业Pd/Al2O3吸附剂脱硫率仅为69.2%,较工业脱硫剂提高了1.40倍。负载型三维网状Pd基双金属吸附剂的深度吸附脱硫效果明显高于工业吸附剂的吸附效果,表明该吸附剂在苯深度吸附脱硫领域有着广阔的应用前景。
表1为制备的负载型三维网状Pd基双金属吸附剂与工业Pd/Al2O3吸附剂在苯深度脱硫测试中对噻吩吸附率随时间的变化。
Claims (2)
1.一种深度脱硫的负载型Pd基双金属吸附剂,其特征在于:它一种由直径为4~5nm、长达数微米的Pd-Ni或Pd-Co纳米线交错缠绕在羟基纳米氧化铝载体上,与载体紧密结合的呈三维纳米线网状结构的Pd基双金属吸附剂。
2.权利要求1的深度脱硫负载型Pd基双金属吸附剂的制备方法,其特征在于:它包括如下步骤:
(1)纳米氧化铝载体表面羟基化处理
按每10mL蒸馏水加入0.1g的纳米三氧化二铝比例,将纳米三氧化二铝和蒸馏水放入三口烧瓶中,加热至80~110℃后,按氨水与蒸馏水的体积比为1:100的比例,加入适量体积氨水,搅拌1~3h,制得羟基纳米氧化铝载体;
(2)制备负载型Pd基双金属/γ-Al2O3吸附剂
配置质量浓度为0.25~3%的曲拉通X-114水溶液,超声分散备用;按照摩尔比为0.33~3:1称取硝酸钯(Pd(NO3)2)和过渡金属硝酸盐放入容器中,加入超纯水,配制成金属盐总浓度为10~40mM的混合金属盐溶液;按照曲拉通X-114溶液与混合金属盐溶液的体积比为1~9:1,将上述混合金属盐溶液与曲拉通溶液混合均匀,置于0~45℃水浴锅中搅拌;向上述混合溶液中加入与金属盐质量比为66~199:1的羟基纳米氧化铝,磁力搅拌20~30min使其与溶液混匀;按NaBH4水溶液与曲拉通 X-114的体积比为1~3:1的比例,将浓度为1~2.5mg/mL的NaBH4水溶液迅速倒入金属溶液中,搅拌0.15~3min后静置3~15min,用乙醇和水的混合液,离心洗涤5~6次,在70~100℃下干燥,即可得到负载型Pd基双金属/γ-Al2O3吸附剂;
所述过渡金属硝酸盐为Ni(NO3)2或Co(NO3)2;
所述负载型Pd基双金属/γ-Al2O3三维纳米线网状吸附剂为Pd-Ni/γ-Al2O3或Pd-Co/γ-Al2O3。
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