CN108067227B - 一种高分散于载体三氧化二铝的铂基催化剂及其制备方法和应用 - Google Patents
一种高分散于载体三氧化二铝的铂基催化剂及其制备方法和应用 Download PDFInfo
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Abstract
本发明公开了一种高分散于载体Al2O3的Pt基催化剂及其制备方法和应用,一种高分散于载体Al2O3的Pt基催化剂,以Al2O3为载体,以In2O3、La2O3为助剂,以金属Pt为活性组分;以催化剂总质量为基准,所述的金属Pt的质量百分含量为0.2~2%,所述的In2O3的质量百分含量为7~9%,所述的La2O3的质量百分含量为10~12%,所述的Al2O3质量百分含量为75~85%,并且该催化剂可丙烷脱氢中应用。本发明的优势在于,该催化剂将Pt、In掺入钙钛矿B位中,使Pt、In在原子级别均匀地分散于钙钛矿结构中,使还原后的Pt粒子和氧化铟会呈高分散的状态分布于载体氧化铝上;Pt的粒径小且粒子之间有氧化铟、氧化镧粒子起到阻隔的作用,使Pt在高温下不易团聚,更多地暴露活性位点,从而提高反应的活性和稳定性。
Description
技术领域
本发明属于金属催化剂的技术领域,具体涉及一种高分散于载体三氧化二铝的铂基催化剂及其制备方法和应用。
背景技术
丙烯是非常重要的化工原料,是三大合成材料的基本原料,主要用于生产聚丙烯、丙烯腈、异丙醇、丙酮和环氧丙烷等。随着经济和丙烯下游产业的蓬勃发展,相对应的,对丙烯的需求也随之增加。目前丙烯主要来自石脑油蒸汽裂解和流化催化裂化的副产物。但随着石油的不断短缺及价格上涨,这两种工艺的丙烯产量已经远远不能满足国内对丙烯的需求。所以加快研究丙烯的其他生产工艺,填补丙烯需求的缺口是目前亟待解决的问题。
丙烷脱氢制丙烯因具有廉价的成本而得到很大的关注。丙烷主要来自液化石油气和油田伴生气中的低碳烷烃。液化石油气主要用作民用燃料燃烧掉,造成了极大的浪费。所以将丙烷脱氢制得丙烯一方面可以提高丙烷利用率,其次丙烯作为原料生产更具价值的化工产品可产生更大的经济效益。已经工业化的丙烷脱氢工艺有UOP公司的Oleflex工艺、Lummus Technology公司的Catofin工艺、KruppUhde公司的STAR工艺、Snamprogetti-Yarsintez公司的FBD工艺和Linde/BASF公司的Linde工艺。Catofin工艺、FBD工艺、Linde工艺采用的催化剂是铬系催化剂,铬具有一定的毒性,对环境不友好。Oleflex工艺、STAR工艺使用的催化剂铂系催化剂,催化效果好,环境友好,但铂价格昂贵,催化剂易积碳失活,不稳定。因此开发活性高、稳定性好、选择性高的催化剂是解决丙烷脱氢制丙烯技术的关键所在。
发明内容
本发明针对Pt基催化剂体系易聚集长大,积碳严重和选择性低的问题提出了一种高分散于载体Al2O3的Pt基催化剂制备方法及其在丙烷脱氢制丙烯反应中的应用。该催化剂有效改善了催化剂易烧结、积碳严重使活性下降的问题,具有良好的丙烷脱氢活性、丙烯选择性和反应稳定性。
本发明是通过以下技术方法实现的:
一种高分散于载体Al2O3的Pt基催化剂,以Al2O3为载体,以In2O3、La2O3为助剂,以金属Pt为活性组分;以催化剂总质量为基准,所述的金属Pt的质量百分含量为0.2~2%,所述的In2O3的质量百分含量为7~9%,所述的La2O3的质量百分含量为10~12%,所述的Al2O3质量百分含量为75~85%。
而且,优选地,以催化剂总质量为基准,所述的金属Pt的质量百分含量为0.2~1.5%,所述的In2O3的质量百分含量为7.4~9.0%,所述的La2O3的质量百分含量为10.4~10.8%,所述的Al2O3质量百分含量为78~82%。
一种高分散于载体Al2O3的Pt基催化剂的制备方法,步骤如下:
步骤一,将硝酸镧、硝酸铟、氯铂酸溶于去离子水,加入络合剂柠檬酸和乙二醇,硝酸镧、硝酸铟、氯铂酸、柠檬酸和乙二醇的摩尔比为1:(0.8~1.0):(0.01~0.18):(0.4~3.5):(0.1~6.0);
步骤二,将Al2O3在600~650℃下高温焙烧5~6h,升温速率为5℃/min,将步骤一中的混合溶液逐滴滴加到处理后的Al2O3上,进行等体积浸渍;
步骤三,将浸渍后的Al2O3干燥,然后在马弗炉空气气氛下,自20~25℃升温至350~400℃,焙烧2~3h,升温速度为1~5℃/min;再以1~5℃/min升温速度升温至700~800℃焙烧5~6h,得到LaIn1-yPtyO3/Al2O3催化剂前驱体;自然冷却至500~550℃后,在H2-N2气氛中充分还原LaIn1-yPtyO3/Al2O3催化剂前驱体,得到高分散于载体Al2O3的Pt基催化剂,即Pt-La2O3-In2O3/Al2O3催化剂。
而且,步骤一中,优选地,硝酸镧、硝酸铟、氯铂酸、柠檬酸和乙二醇的摩尔比为1:(0.85~0.95):(0.02~0.15):(0.5~2.5):(1.5~4.5)。
而且,步骤二中,浸渍的时间为24h,温度为室温。
而且,步骤三中,干燥的条件为先在80~90℃下干燥6~7h然后在120~130℃下干燥12~13h。
而且,步骤三中,优选地,在马弗炉空气气氛下,自22~25℃升温至360~380℃,焙烧2.5~3h,升温速度为1~5℃/min;再以1~5℃/min升温速度升温至750~770℃焙烧5.5~6h。
而且,步骤三中,自然冷却至500~520℃。
而且,步骤三中,在H2-N2气氛中还原的时间为2~3h,H2氢气的体积比为5%。
一种高分散于载体Al2O3的Pt基催化剂在丙烷脱氢中的应用。
在进行丙烷脱氢时,步骤如下:
步骤一,将Pt-La2O3-In2O3/Al2O3催化剂进行压片处理并筛分得到40~60目的颗粒状催化剂并装入固定床反应器,通入氢氮混合气,以10℃/min的升温速率升温至500~520℃对催化剂进行还原,还原时间为2~2.5h,氢氮混合气中H2体积比为5~6%;
步骤二,还原完成后,在常压和催化剂床层温度为600℃的条件下,向反应器中以1500h-1的质量空速通入C3H8、H2和N2的反应气进行反应,C3H8:H2:N2的体积比为(8~8.5):(7~7.5):(35~35.5)的,反应时间为10~240分钟。
本发明的有益效果为:
该催化剂将Pt、In掺入钙钛矿B位中,使Pt、In在原子级别均匀地分散于钙钛矿结构中,这样还原后的Pt粒子和氧化铟会呈高分散的状态分布于载体氧化铝上。Pt的粒径小且粒子之间有氧化铟、氧化镧粒子起到阻隔的作用,使Pt在高温下不易团聚,更多地暴露活性位点,从而提高反应的活性和稳定性。
附图说明
图1是x%wt Pt负载量的LaIn1-yPtyO3/Al2O3的XRD谱图。其中◆为钙钛矿衍射峰。a:Al2O3,b:x=0.2,c:x=0.5,d:x=1.0,e:x=1.5,f:x=2.0。(y为Pt在钙钛矿中的原子数)
图2是还原后的Pt含量为0.5%的Pt-La2O3-In2O3/Al2O3催化剂TEM图。
具体实施方式
下面结合附图和实施例对本发明进行详细的说明。
实施例1
(1)取Al2O3白色粉末于200mL坩埚,并置于马弗炉。以5℃/min的升温速率升至600℃焙烧5h。取1.6g SiO2于25mL小烧杯。
(2)取0.569g六水合硝酸镧,0.403g六水合硝酸铟,0.01g铂于25mL小烧杯,加入0.6mL去离子水溶解。
(3)取0.646g一水合柠檬酸,0.039mL乙二醇加入上述溶液,搅拌溶解并混合均匀。
(4)将(3)中得到的溶液逐滴滴入(1)中的Al2O3载体上,室温静置使之充分浸渍24h,得到凝胶状固体。
(5)将上述凝胶状固体80℃下干燥6h,120℃干燥12h,干燥的产物在马弗炉中350℃焙烧2h,700℃焙烧5h,得到LaIn1-yPtyO3/Al2O3催化剂前驱体。
(6)将0.5%Pt含量的LaIn1-yPtyO3/Al2O3催化剂前驱体进行压片处理并筛分得到40~60目的颗粒状催化剂。
(7)将0.4g颗粒状的0.5%Pt含量的LaIn1-yPtyO3/Al2O3催化剂前驱体装入固定床反应器,通入氢氮混合气,以10℃/min的升温速率升温至500℃对催化剂进行还原,还原时间为2h,氢氮混合气中H2体积比为5%;
(8)待还原完成后,在常压和催化剂床层温度为600℃的条件下,向反应器中以1500h-1的质量空速通入C3H8:H2:N2=8:7:35的合成气进行反应。
上述步骤(5)中得到LaIn1-yPtyO3/Al2O3催化剂前驱体后,令LaIn1-yPtyO3/Al2O3催化剂前驱体在H2-N2气氛下还原2h,得到0.5%Pt负载量的Pt-In2O3-La2O3/Al2O3催化剂,所得的Pt-In2O3-La2O3/Al2O3催化剂的XRD谱图如图1所示(XRD在德国布鲁克AXS有限公司D8-Focus型X射线衍射仪上进行。测试前,将催化剂研磨至粉末,并将粉末状样品平铺于样品槽中并压平。CuKα(λ=0.15406nm)射线作为辐射源,管电压40kV,管电流为200mA,2θ测角范围为10-75°扫描速度为8°/min)。还原后所得0.5%Pt含量的Pt-In2O3-La2O3/Al2O3催化剂的TEM如图2所示(样品的场发射透射电子显微镜照片在日本电子公司型号为JEOLJEM-2100F的电子显微镜上获得。测试样品经过研磨、超声后分散于乙醇中,并将得到的悬浊液置于铜网上,待样品干燥之后即可进行测试)。
上述步骤(8)结束后所得的反应产物采用气相色谱仪进行分析,丙烷转化率、丙烯选择性与时间的关系如表1所示,丙烷转化率、各产物选择性计算公式如下:
C3H8转化率%=尾气中产物总碳原子数/尾气中(包括未反应反应物)总碳原子数×100%
产物选择性%=尾气中某一组分的碳原子数/尾气中产物总碳原子数×100%
表1不同反应时间的丙烷转化率、丙烯选择性
反应时间(min) | 丙烷转化率(%) | 丙烯选择性(%) |
0 | 34.04 | 50.25 |
60 | 9.7 | 84.36 |
120 | 9.2 | 84.95 |
180 | 9.12 | 85.77 |
240 | 9.08 | 86.12 |
由表1可见,随着时间进行,反应刚开始是不稳定的,丙烷转化率很高但丙烯选择性较低,随着反应的进行,活性和转化率基本趋于稳定,反应4h活性基本未下降,说明该催化剂稳定性是很好的。
实施例2:
采用实施例1方法进行反应,其区别仅在于Pt占催化剂总质量的质量百分含量为0.2%。
实施例3:
采用实施例1方法进行反应,其区别仅在于Pt占催化剂总质量的质量百分含量为1%。
实施例4:
采用实施例1方法进行反应,其区别仅在于Pt占催化剂总质量的质量百分含量为1.5%。
实施例5:
采用实施例1方法进行反应,其区别仅在于Pt占催化剂总质量的质量百分含量为2%。
关于上述实施例结果和数据,均采用反应后240min的活性数据做对比,以考察不同Pt含量对催化剂反应性能的影响。
Pt质量百分含量对催化剂反应活性的影响,参见表2。反应条件同实施例1、2、3、4、5。
表2Pt质量百分含量对催化剂反应活性和丙烯选择性的影响
Pt质量百分含量(%) | 丙烷转化率(%) | 丙烯选择性(%) |
0.2 | 2.41 | 54.1 |
0.5 | 9.08 | 86.12 |
1 | 12.06 | 89.26 |
1.5 | 24.88 | 94.34 |
2 | 33.7 | 96.14 |
从表中结果可看出,随着Pt含量的增加,丙烷转化率逐渐增加,当Pt负载量达到2%时,转化率达到了33.7%,丙烯选择性也达到了96%,且稳定性很好,反应4h活性没有任何下降。
依照本发明内容记载工艺条件进行制备,均可制备本发明中所述的高分散于载体Al2O3的Pt基催化剂且表现出与实施例基本一致的性能。以上对本发明的技术方案做了示例性的描述,应该说明的是,在不脱离本技术方案的核心的情况下,任何简单的变形、修改或者其他本领域技术人员能够不花费创造性劳动的等同替换均落入本专利的保护范围。
Claims (10)
1.一种用于丙烷脱氢的高分散于载体Al2O3的Pt基催化剂,其特征在于:以Al2O3为载体,以In2O3、La2O3为助剂,以金属Pt为活性组分;以催化剂总质量为基准,所述的金属Pt的质量百分含量为0.2~2%,所述的In2O3的质量百分含量为7~9%,所述的La2O3的质量百分含量为10~12%,所述的Al2O3质量百分含量为75~85%,金属Pt、In2O3、La2O3和Al2O3的质量百分含量之和为100%;并按照下述步骤进行制备:
步骤一,将硝酸镧、硝酸铟、氯铂酸溶于去离子水,加入络合剂柠檬酸和乙二醇,硝酸镧、硝酸铟、氯铂酸、柠檬酸和乙二醇的摩尔比为1:(0.8~1.0):(0.01~0.18):(0.4~3.5):(0.1~6.0);
步骤二,将Al2O3在600~650℃下高温焙烧5~6h,升温速率为5℃/min,将步骤一中的混合溶液逐滴滴加到处理后的Al2O3上,进行等体积浸渍;
步骤三,将浸渍后的Al2O3干燥,然后在马弗炉空气气氛下,自20~25℃升温至350~400℃,焙烧2~3h,升温速度为1~5℃/min;再以1~5℃/min升温速度升温至700~800℃焙烧5~6h,得到LaIn1-yPtyO3/Al2O3催化剂前驱体;自然冷却至500~550℃后,在H2-N2气氛中充分还原LaIn1-yPtyO3/Al2O3催化剂前驱体,得到用于丙烷脱氢的高分散于载体Al2O3的Pt基催化剂,即Pt-La2O3-In2O3/Al2O3催化剂。
2.根据权利要求1所述的一种用于丙烷脱氢的高分散于载体Al2O3的Pt基催化剂,其特征在于:以催化剂总质量为基准,所述的金属Pt的质量百分含量为0.2~1.5%,所述的In2O3的质量百分含量为7.4~9.0%,所述的La2O3的质量百分含量为10.4~10.8%,所述的Al2O3质量百分含量为78~82%,金属Pt、In2O3、La2O3和Al2O3的质量百分含量之和为100%。
3.一种如权利要求1所述的用于丙烷脱氢的高分散于载体Al2O3的Pt基催化剂的制备方法,其特征在于,按照下述步骤进行制备:
步骤一,将硝酸镧、硝酸铟、氯铂酸溶于去离子水,加入络合剂柠檬酸和乙二醇,硝酸镧、硝酸铟、氯铂酸、柠檬酸和乙二醇的摩尔比为1:(0.8~1.0):(0.01~0.18):(0.4~3.5):(0.1~6.0);
步骤二,将Al2O3在600~650℃下高温焙烧5~6h,升温速率为5℃/min,将步骤一中的混合溶液逐滴滴加到处理后的Al2O3上,进行等体积浸渍;
步骤三,将浸渍后的Al2O3干燥,然后在马弗炉空气气氛下,自20~25℃升温至350~400℃,焙烧2~3h,升温速度为1~5℃/min;再以1~5℃/min升温速度升温至700~800℃焙烧5~6h,得到LaIn1-yPtyO3/Al2O3催化剂前驱体;自然冷却至500~550℃后,在H2-N2气氛中充分还原LaIn1-yPtyO3/Al2O3催化剂前驱体,得到高分散于载体Al2O3的Pt基催化剂,即Pt-La2O3-In2O3/Al2O3催化剂。
4.根据权利要求3所述的一种用于丙烷脱氢的高分散于载体Al2O3的Pt基催化剂的制备方法,其特征在于:步骤一中,硝酸镧、硝酸铟、氯铂酸、柠檬酸和乙二醇的摩尔比为1:(0.85~0.95):(0.02~0.15):(0.5~2.5):(1.5~4.5)。
5.根据权利要求3所述的一种用于丙烷脱氢的高分散于载体Al2O3的Pt基催化剂的制备方法,其特征在于:步骤二中,浸渍的时间为24h,温度为室温。
6.根据权利要求3所述的一种用于丙烷脱氢的高分散于载体Al2O3的Pt基催化剂的制备方法,其特征在于:步骤三中,干燥的条件为先在80~90℃下干燥6~7h然后在120~130℃下干燥12~13h。
7.根据权利要求3所述的一种用于丙烷脱氢的高分散于载体Al2O3的Pt基催化剂的制备方法,其特征在于:步骤三中,在马弗炉空气气氛下,自22~25℃升温至360~380℃,焙烧2.5~3h,升温速度为1~5℃/min;再以1~5℃/min升温速度升温至750~770℃焙烧5.5~6h。
8.根据权利要求3所述的一种用于丙烷脱氢的高分散于载体Al2O3的Pt基催化剂的制备方法,其特征在于:步骤三中,自然冷却至500~520℃;在H2-N2气氛中还原的时间为2~3h,H2氢气的体积比为5%。
9.如权利要求1或2所述的一种用于丙烷脱氢的高分散于载体Al2O3的Pt基催化剂在丙烷脱氢中的应用。
10.根据权利要求9所述的一种用于丙烷脱氢的高分散于载体Al2O3的Pt基催化剂在丙烷脱氢中的应用,其特征在于,步骤如下:
步骤一,将Pt-La2O3-In2O3/Al2O3催化剂进行压片处理并筛分得到40~60目的颗粒状催化剂并装入固定床反应器,通入氢氮混合气,以10℃/min的升温速率升温至500~520℃对催化剂进行还原,还原时间为2~2.5h,氢氮混合气中H2体积比为5~6%;
步骤二,还原完成后,在常压和催化剂床层温度为600℃的条件下,向反应器中以1500h-1的质量空速通入C3H8、H2和N2的反应气进行反应,C3H8:H2:N2的体积比为(8~8.5):(7~7.5):(35~35.5),反应时间为10~240分钟。
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