CN108970600B - 一种催化剂及合成气直接转化制低碳烯烃的方法 - Google Patents
一种催化剂及合成气直接转化制低碳烯烃的方法 Download PDFInfo
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- CN108970600B CN108970600B CN201710408018.9A CN201710408018A CN108970600B CN 108970600 B CN108970600 B CN 108970600B CN 201710408018 A CN201710408018 A CN 201710408018A CN 108970600 B CN108970600 B CN 108970600B
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Classifications
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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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/19—Catalysts containing parts with different compositions
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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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/005—Spinels
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Abstract
本发明属于合成气直接制备低碳烯烃,具体涉及一种催化剂及合成气直接转化制低碳烯烃的方法,其以合成气为反应原料,在固定床或移动床上进行转化反应,所述催化剂为复合催化剂A+B,由催化剂A和催化剂B以机械混合方式复合在一起,催化剂A的活性成份为活性金属氧化物,催化剂B为氧化物负载的分子筛,分子筛为CHA、AEI结构中的一种或两种,其中分子筛的载量是4%‑45%wt;催化剂A中的活性成份与催化剂B之间的重量比在0.1‑20倍范围之间,优选为0.3‑5。反应过程具有很高的低碳烯烃选择性,低碳烯烃包括乙烯、丙烯和丁烯的选择性之和可以达到50‑90%,同时副产物甲烷选择性低于15%,同时具有很好的应用前景。
Description
技术领域
本发明属于合成气制备低碳烯烃,具体涉及一种催化剂及合成气直接转化制低碳烯烃的方法。
背景技术
低碳烯烃是指碳原子数小于或等于4的烯烃。以乙烯、丙烯为代表的低碳烯烃是非常重要的基本有机化工原料,随着我国经济的快速增长,长期以来,低碳烯烃市场供不应求。目前,低碳烯烃的生产主要采用轻烃(乙烷、石脑油、轻柴油)裂解的石油化工路线,由于全球石油资源的日渐缺乏和原油价格长期高位运行,发展低碳烯烃工业仅仅依靠石油轻烃为原料的管式裂解炉工艺会遇到越来越大的原料难题,低碳烯烃生产工艺和原料必须多元化。选用合成气制取烯烃工艺可拓宽原材料来源,将以原油、天然气、煤炭和可再生材料为原料生产合成气,为基于高成本原料如石脑油的蒸汽裂解技术方面提供替代方案。合成气一步法直接制取低碳烯烃就是一氧化碳和氢在催化剂作用下,通过费托合成反应直接制得碳原子数小于或等于4的低碳烯烃的过程,该工艺无需像间接法工艺那样从合成气经甲醇或二甲醚,进一步制备烯烃,简化工艺流程,大大减少投资。
合成气通过费托合成直接制取低碳烯烃,已成为费托合成催化剂开发的研究热点之一。中科院大连化学物理研究所公开的专利CN1083415A中,用MgO等IIA族碱金属氧化物或高硅沸石分子筛(或磷铝沸石)担载的铁-锰催化剂体系,以强碱K或Cs离子作助剂,在合成气制低碳烯烃反应压力为1.0~5.0MPa,反应温度300~400℃下,可获得较高的活性(CO转化率90%)和选择性(低碳烯烃选择性66%)。北京化工大学所申报的专利ZL03109585.2中,采用真空浸渍法制备锰、铜、锌硅、钾等为助剂的Fe/活性炭催化剂用于合成气制低碳烯烃反应,在无原料气循环的条件下,CO转化率96%,低碳烯烃在碳氢化合物中的选择性68%。2012年,荷兰Utrecht大学de Jong教授团队采用SiC,碳纳米纤维等惰性载体负载的Fe以及Na、S等助剂修饰的Fe催化剂,取得了很好进展获得了61%的低碳烯烃选择性,但是转化率升高时,选择性降低。2016年,上海高等研究院孙予罕研究院及钟良枢研究员报道了一种择优暴露[101]及[020]锰助碳化钴基催化剂,实现了31.8%的CO转化率下,60.8%的低碳烯烃选择性,且甲烷选择性5%。上述报道中催化剂是采用铁及钴基催化剂为活性组分,反应遵循金属表面的链增长反应机理,产物低碳烯烃选择性低。
最近中国科学院大连化学物理研究所包信和院士和潘秀莲研究员报道了氧化铝负载的ZnCr2O4氧化物与多级孔SAPO-34分子筛复合双功能催化剂(Jiao et al.,Science351(2016)1065-1068),实现了CO转化率17%时,低碳烯烃80%的选择性,其中低碳烷烃选择性为14,烯烃与烷烃的比例(烯烷比)达到5.7。当转化率升高到35%,烯烃的选择性为69%,而烷烃的选择性为20%,烯烷比降为3.5。如何实现高转化率的同时稳定烯烷比仍然是这一领域的一大难点。
发明内容
针对上述问题,本发明提供了一种催化剂及合成气直接转化制低碳烯烃的方法。
本发明的技术方案为:
一种催化剂,所述催化剂为复合催化剂A+B,由催化剂组份A和催化剂组份B以机械混合方式复合在一起,催化剂组份A的活性成份为活性金属氧化物,催化剂B为多级孔Al2O3、SiO2、TiO2、ZrO2、CeO2、MgO、Ga2O3一种或两种以上负载CHA与AEI结构的分子筛一种或两种,B中分子筛载量是4%-45%wt;活性金属氧化物为MnO、MnCr2O4、MnAl2O4,MnZrO4、ZnO、ZnCr2O4、ZnAl2O4、CoAl2O4、FeAl2O4中的一种或二种以上。
所述催化剂B中多级孔Al2O3、SiO2、TiO2、ZrO2、CeO2、MgO、Ga2O3一种或两种以上作为载体,比表面积是30-250m2/g,孔容为0.25~0.80ml/g;按照比表面积计算,介孔占30-75%,大孔占25-70%;分子筛作为活性组分,通过原位生长或物理混合的方式分散在载体周围。
组分A优选为MnO、MnCr2O4、MnAl2O4,MnZrO4、ZnAl2O4、CoAl2O4、FeAl2O4中的一种或二种以上;
催化剂组份A的活性金属氧化物和组份B的颗粒的几何中心之间间距介于50nm-20mm之间,优选为300nm-5mm,更优选为1μm-2.5mm;
催化剂组份A中的活性成份与催化剂组份B之间的重量比在0.1-20倍范围之间,优选为0.3-5。
活性金属氧化物由大小为5-30nm的晶粒构成,从晶粒表面至晶粒内部方向深度为0.3nm的距离范围内,存在大量氧空位,其中氧原子摩尔量占理论化学计量比氧摩尔含量的80%以下,优选为80%-10%,更优选为60-10%,最优选为50-10%;表面氧空位定义为:100%-氧原子摩尔量占理论化学计量比氧摩尔量的百分数,对应的氧空位浓度优选为20-90%,更优选为40-90%,最优选为50-90%。
所述催化剂A中还添加有分散剂,分散剂为Al2O3、SiO2、Cr2O3、ZrO2、TiO2中的一种或二种,活性金属氧化物分散于分散剂中,分散剂于催化剂A中的含量在0.05-90wt%,其余为活性金属氧化物。
其以合成气为反应原料,在固定床或移动床上进行转化反应,所采用的催化剂为权利要求1-7任一所述的催化剂;
合成气的压力为0.5-10MPa,反应温度为300-600℃,空速为300-10000h-1,所述反应用合成气H2/CO比例为0.2-3.5。
所述的双功能复合催化剂用于合成气一步法直接转化制低碳烯烃,其中乙烯与丙烯选择性之和达到40-60%,低碳烯烃包括乙烯、丙烯和丁烯的选择性之和可以达到50-90%,同时副产物甲烷选择性低于15%。
本发明具有如下优点:
1.本技术与传统的甲醇制低碳烯烃技术(简称为MTO)不同,实现了一步直接将合成气转化制低碳烯烃。
2.由于多级孔载体分散分子筛,有利于中间体及产物传质,大大减少了加氢等副反应的影响,可以维持高低碳烯烃选择性的同时提高转化率。
3.专利中的复合催化剂的制备过程简单条件温和;且反应过程具有很高的产品收率和选择性,C2-C4低碳烯烃的选择性可以达到50-90%,特别提高转化率后仍然能维持高的烯烷比,同时副产物甲烷选择性低(<15%),而且催化剂寿命长,>700小时,具有很好的应用前景。
具体实施方式
下面通过实施例对本发明做进一步阐述,但是本发明的权利要求范围不受这些实施例的限制。同时,实施例只是给出了实现此目的的部分条件,但并不意味着必须满足这些条件才可以达到此目的。
实施例1
一、催化剂A的制备
(一)、刻蚀法合成具有极性表面的ZnO材料:
(1)分别称取4份、每份0.446g(1.5mmol)Zn(NO3)2·6H2O于4个容器中,再分别称取0.300g(7.5mmol)、0.480g(12mmol)、0.720g(18mmol)、1.200g(30mmol)NaOH依次加入上述4个容器中,再各量取30ml去离子水加入到4个容器中,搅拌0.5h以上使溶液混合均匀。升温至温度为160℃,反应时间为20h,沉淀分解成氧化锌;自然冷却至室温。反应液离心分离收集离心分离后的沉淀物,用去离子水洗涤2次获得ZnO氧化物;
取其中0.480g(12mmol)NaOH用量的产物进行下述处理:
(2)采用油酸、乌洛托品、乙二胺、氨水、水合肼等刻蚀剂,在常温下与ZnO氧化物超声混匀,ZnO氧化物浸泡于刻蚀剂溶液中,刻蚀剂与氧化锌形成络合或直接还原反应;
将上述悬浮物加热,然后取出洗涤过滤,得到具有大量表面氧空穴的纳米ZnO材料。
表1中:催化剂与刻蚀剂的质量比为1:3。油酸与乌洛托品的质量比为1:1,没有溶剂,油酸-5wt%水合肼的质量比为95:5,没有溶剂;具体处理条件包括刻蚀剂、温度、处理时间和气氛种类如下表1所示。
(3)、干燥或干燥和还原:
上述获得的产物经过离心或者过滤,用去离子水清洗以后,在气氛中进行干燥或干燥和还原处理,气氛为惰性气体或者惰性气体与还原性气氛混合气,惰性气体为N2、He和Ar中的一种或二种以上,还原性气氛为H2、CO的一种或二种以上,干燥还原混合气中惰性气体与还原性气体的体积比为100/10~0/100,干燥和还原处理的温度为350摄氏度,时间为4h。即得到表面富含氧空位的ZnO材料。具体样品及其制备条件如下表1。其中表面氧空位定义为(1-氧原子摩尔量占理论化学计量比氧摩尔含量)。
表1 ZnO材料的制备及其参数性能
所述表面氧空位为从晶粒表面至晶粒内部方向深度为0.3nm的距离范围内,氧原子摩尔量占理论化学计量比氧摩尔含量的百分数;
作为对比例,未经第(2)步刻蚀的表面无氧空位的ZnO 9,以及将Zn完全还原的金属Zn 10;
(二)、刻蚀法合成具有极性表面的MnO材料:制备过程同上述(一)中的(1)对应于0.480g(12mmol)NaOH用量的产物和(3)所述,不同之处在于将Zn的前驱体换成了Mn的对应的前驱体,可为硝酸锰、氯化锰、醋酸锰中的一种,在此为硝酸锰。
刻蚀处理过程同上述(一)中(2)的产物ZnO 3、ZnO 5、ZnO 8制备过程所述,合成具有大量表面氧空位的催化剂;表面氧空位67%、29%、27%;
对应产物定义为MnO 1-3;
(三)、刻蚀法合成具有极性表面的CeO2材料:制备过程同上述(一)中的(1)对应于0.480g(12mmol)NaOH用量的产物和(3)所述,不同之处在于将Zn的前驱体换成了Ce的对应的前驱体,可为硝酸铈、氯化铈、醋酸铈中的一种,在此为硝酸铈。
刻蚀处理过程同上述(一)中(2)的产物ZnO 3、ZnO 5、ZnO 8制备过程所述,合成具有大量表面氧空位的催化剂;表面氧空位56%、33%、21%;
对应产物定义为CeO 1-3;
(四)、合成具有高比表面积、高表面能的纳米ZnCr2O4、ZnAl2O4、MnCr2O4、MnAl2O4,MnZrO4尖晶石:
采用硝酸锌、硝酸铝、硝酸铬、硝酸锰、硝酸锆为前驱体,与尿素在室温下于水中相互混合;将上述混合液陈化,然后取出洗涤、过滤和干燥,所得的固体在空气气氛下焙烧,获得沿(110)晶面方向生长的尖晶石氧化物。样品也经过刻蚀法处理,合成具有大量表面氧空位的催化剂;刻蚀处理和后处理过程同上述(一)中(2)和(3)所述,该样品具有大比表面积、表面缺陷多,可应用于催化合成气转化。
具体样品及其制备条件如下表2。同样,表面氧空位定义为(1-氧原子摩尔量占理论化学计量比氧摩尔含量)。
表2尖晶石材料的制备及其性能参数
(五)、合成具有高比表面积、高表面能的纳米FeAl2O4、CoAl2O4尖晶石:制备过程同上述(四)中的(2)所述,不同之处在于将Zn的前驱体换成了Fe或Co的对应的前驱体,可为硝酸铁、氯化铁、柠檬酸铁中的一种或者硝酸钴、氯化钴、醋酸钴中的一种,在此为硝酸铁、硝酸钴。
刻蚀处理过程同上述(一)中(2)的产物ZnO 3、ZnO 5制备过程所述,合成具有大量表面氧空位的催化剂;表面氧空位77%、51%、;
对应产物定义为尖晶石6、尖晶石7;
(六)、Cr2O3、Al2O3或ZrO2分散的活性金属氧化物
以Cr2O3、Al2O3或ZrO2为载体,沉淀沉积法制备Cr2O3、Al2O3或ZrO2分散的活性金属氧化物。以分散ZnO氧化物的制备为例,将商业Cr2O3、Al2O3或ZrO2载体预先分散于底液中,然后采用硝酸锌为原料,与氢氧化钠沉淀剂在室温下混合沉淀,Zn2+的摩尔浓度为0.067M,Zn2 +与沉淀剂的摩尔份数比为1:8;然后在160℃下陈化24小时,获得Cr2O3、Al2O3或ZrO2为载体分散的ZnO氧化物(分散剂于催化剂A中的含量依次为0.1wt%、10wt%、90wt%)。
刻蚀过程同上述(一)中(2)的产物ZnO 3、ZnO 5、ZnO 8制备过程所述,合成具有大量表面氧空位的催化剂;表面氧空位65%、30%、25%;后处理过程同上述(一)中3)所述;
从上到下对应产物定义为分散氧化物1-3;
以同样的方法,可以获得Cr2O3、Al2O3或ZrO2为载体分散的MnO氧化物(分散剂于催化剂A中的含量依次为5wt%、30wt%、60wt%),表面氧空位62%、27%、28%;从上到下对应产物定义为分散氧化物4-6。
二、催化剂B(CHA与AEI拓扑结构的分子筛)的制备:
所述CHA与或AEI拓扑结构具有八元环孔口,三维孔道,含有cha笼。
1)具体制备过程为:
按氧化物SiO2:Al2O3:H3PO4:R:H2O=1.6:16:32:55:150(质量比)称取原料:硅溶胶30%(质量浓度);AlOOH;磷酸;TEA(R);去离子水,室温混合后加入模板剂0.5倍摩尔量的助剂HF,再加入载体氧化物粉末,在30℃下搅拌老化,2h后转移到水热釜中,200℃下晶化24h。水浴骤冷到室温,反复离心洗涤使得洗涤结束时上清液pH是7,沉淀物于110℃下烘干17h后,在600℃空气中焙烧3h得到负载的硅磷铝无机固体酸。
所述具有CHA与AEI拓扑结构的分子筛的骨架元素组成可以是Si-O、Si-Al-O、Si-Al-P-O、Al-P-O、Ga-P-O、Ga-Si-Al-O、Zn-Al-P-O、Mg-Al-P-O、Co-Al-P-O中的一种或二种以上;
部分骨架的O元素上连接H,对应产物依次定义为分1-7;
表3具有CHA或AEI拓扑结构的分子筛的制备及其性能参数
2)其他元素组成的分子筛
对比例分16,其余条件同分1,分子筛载量变为1%
对比例分17,其余条件同分1,分子筛载量变为70%
三、催化剂的制备
将所需比例的催化剂A和催化剂B加入容器中,利用这些物料和/或容器的高速运动产生的挤压力、撞击力、裁剪力、摩擦力等中的一种或两种以上作用实现分离、破碎、混匀等目的,通过调变温度与载气气氛实现机械能、热能与化学能的转换,进一步调节不同组分间的相互作用。
机械混合过程中,可以设置混合温度20-100℃,可以在气氛中或者直接在空气中进行,气氛为:a)氮气和/或惰性气体,b)氢气与氮气和/或惰性气体的混合气,其中氢气于混合气中的体积为5~50%,c)CO与氮气和/或惰性气体的混合气,其中CO于混合气中的体积为5~20%,d)O2与氮气和/或惰性气体的混合气,其中O2于混合气中的体积为5-20%,所述惰性气体为氦气、氩气、氖气中的一种或两种以上。
机械搅拌:在搅拌槽中,采用搅拌棒将催化剂A和B进行混合,通过控制搅拌时间(5min-120min)和速率(30-300转/min),可以调节催化剂A和B的混合程度和相对距离。
球磨:利用磨料与催化剂在研磨罐内高速翻滚,对催化剂产生强烈冲击、碾压,达到分散、混合催化剂A和B的作用。通过控制磨料(材质可以是不锈钢、玛瑙、石英。尺寸范围:5mm-15mm)。与催化剂的比例(质量比范围:20-100:1),可以调节催化剂的粒度及相对距离。
摇床混合法:将催化剂A和B预混合,并装入容器中;通过控制摇床的往复振荡或圆周振荡,实现催化剂A和B的混合;通过调节振荡速度(范围:1-70转/分)和时间(范围:5min-120min),实现均匀混合并调节其相对距离。
机械研磨法:将催化剂A和B预混合,并装入容器中;在一定的压力(范围:5公斤-20公斤)下,通过研具与混合的催化剂进行相对运动(速率范围:30-300转/min),达到调节催化剂粒度、相对距离和实现均匀混合的作用。
具体的催化剂制备及其参数特征如表6所示。
表6催化剂的制备及其参数特征
催化反应实例
以固定床反应为例,但是催化剂也适用于移动床反应器。该装置配备气体质量流量计、在线产物分析色谱(反应器的尾气直接与色谱的定量阀连接,进行周期实时采样分析)。
将上述本发明的催化剂2g,置于固定床反应器中,使用Ar置换反应器中的空气,然后再在H2气氛中升温至300℃,切换合成气(H2/CO摩尔比=0.2-3.5),合成气的压力为0.5-10MPa,升温至反应温度300-600℃,调节反应原料气的空速至500-10000ml/g/h。产物由在线色谱检测分析。
改变温度、压力和空速和合成气中H2/CO的摩尔比,可以改变反应性能。低碳烯烃(乙烯、丙烯、丁烯选择性之和可以达到50-90%;由于催化剂金属复合物表面加氢活性不高,避免了甲烷的大量生成,甲烷选择性低。表7列出了催化剂的具体应用及其效果数据。
表7催化剂的具体应用及其效果数据
对比例1催化剂组份A为ZnO 9,组份B为分1。
对比例2中催化剂组份A为Zn 10,组份B为分1
对比例3采用的催化剂中组份A为金属ZnCo+分1,ZnCo摩尔比1:1,ZnCo与分1质量比1:1,其余参数及混合过程等均同催化剂C;
对比例4采用的催化剂为表面无氧空穴TiO2+分1,其余参数及混合过程等均同催化剂C;
对比例5采用的催化剂中分子筛为购自南开大学催化剂厂的商品SAPO-34,没有载体分散。
对比例6采用的催化剂中分子筛为购自南开大学催化剂厂的商品ZSM-5,全微孔结构,Si/Al=30,没有载体分散。
对比例5和6的反应结果表明,CHA或AEI的拓扑结构及其是否有载体分散对产物选择性的调变至关重要。
对比例7采用的催化剂中金属氧化物与分子筛之间的距离为10mm,其余参数及混合过程等均同催化剂C。
对比例8采用的催化剂中金属氧化物位于分子筛孔道内,两者密切接触,其余参数等均同催化剂C。
对比例7和8的结果表明,组份A和组份B之间的距离对产物选择性也很重要。
文献(Jiao et al.,Science 351(2016)1065-1068)对比技术中,所使用的分子SAPO-34没有载体负载,在转化率17时,烯烃选择性能达到80%,但降低空速当转化率升高到35%,烯烃的选择性为69%,而烷烃的选择性为20%,烯烷比降为3.5,与而实施例中催化剂C,J
对比例9,10的催化剂,其余条件同C,仅仅分子筛分别换成了分16,分17对比例9可见,分子筛载量太低,导致,甲烷偏高,且烯烃选择性也偏低。对比例10可见,分子筛载量过高,导致,加氢严重,烯烃选择性偏低。特别空速降低,转化率提高后,相比催化剂C,烯烷比下降及其显著。
由上表可以看出分子筛的结构,包括CHA&AEI的拓扑结构及其酸强度和酸量,以及金属氧化物和分子筛之间的距离匹配至关重要,直接影响一氧化碳的转化率和丙烯丁烯的选择性。
Claims (6)
1. 一种催化剂,其特征在于:所述催化剂为复合催化剂A+B,由催化剂组份A和催化剂组份B以机械混合方式复合在一起:催化剂组份A为活性金属氧化物;催化剂B为负载型分子筛,载体为多级孔Al2O3、SiO2、TiO2、ZrO2、CeO2、MgO、Ga2O3一种或两种以上,分子筛为CHA与AEI结构中的一种或两种,分子筛载量是4wt%-45wt%;活性金属氧化物为MnO、MnCr2O4、MnAl2O4, MnZrO4、ZnO、ZnCr2O4、ZnAl2O4、CoAl2O4、FeAl2O4中的一种或二种以上;
所述催化剂组份B中多级孔Al2O3、SiO2、TiO2、ZrO2、CeO2、MgO、Ga2O3一种或两种以上作为载体,比表面积是30-250 m2/g,孔容为0.25~0.80 mL/g;按照比表面积计算,介孔占30-75%,大孔占25-70%;分子筛作为活性组分,通过原位生长或物理混合的方式分散在载体周围;
催化剂组份A与催化剂组份B之间的重量比在 0.1-20倍范围之间,活性金属氧化物由大小为5-30nm的晶粒构成,从晶粒表面至晶粒内部方向深度为0.3nm的距离范围内,存在大量氧空位,其中氧原子摩尔量占理论化学计量比氧摩尔含量的80%以下;表面氧空位定义为:100%-氧原子摩尔量占理论化学计量比氧摩尔量的百分数,对应的氧空位浓度为20-90%。
2.按照权利要求1所述的催化剂,其特征在于,组分A为MnO、MnCr2O4、MnAl2O4、MnZrO4、ZnAl2O4、CoAl2O4、FeAl2O4中的一种或二种以上。
3.按照权利要求1所述的催化剂,其特征在于:催化剂组份A与催化剂组份B之间的重量比在0.3-5倍范围之间。
4.按照权利要求1所述的催化剂,其特征在于:其中氧原子摩尔量占理论化学计量比氧摩尔含量为80%-10%;对应的氧空位浓度为40-90%。
5.按照权利要求1所述的催化剂,其特征在于:所述催化剂A中还添加有分散剂,分散剂为Al2O3、SiO2、Cr2O3、ZrO2、TiO2中的一种或二种,活性金属氧化物分散于分散剂中,分散剂于催化剂A中的含量在0.05-90wt%,其余为活性金属氧化物。
6.一种合成气直接转化制低碳烯烃的方法,其特征在于:其以合成气为反应原料,在固定床或移动床上进行转化反应,所采用的催化剂为权利要求1-5任一所述的催化剂;合成气的压力为0.5-10MPa,反应温度为300-600℃,空速为300-10000 h-1,所述反应用合成气H2/CO 比例为0.2-3.5。
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