CN104627960A - 一种改性赤泥催化甲烷裂解制氢的方法 - Google Patents
一种改性赤泥催化甲烷裂解制氢的方法 Download PDFInfo
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Abstract
本发明涉及一种改性赤泥催化甲烷裂解制氢的方法,该方法的特点是用无机酸溶液对赤泥进行浸泡处理,过滤后得到透明滤液,再用碱对滤液进行中和沉淀,对沉淀过滤洗涤干燥后煅烧还原,研磨成粉末,得到一种用于催化甲烷裂解的催化剂。该方法一方面实现了赤泥的资源化利用,降低了催化剂的成本;另一方面充分利用了赤泥中金属及其氧化物的催化活性,应用于催化甲烷裂解制氢取得了良好的效果。
Description
技术领域
本发明属于甲烷催化裂解制氢技术领域,具体说是涉及一种改性赤泥催化甲烷裂解制氢的方法。
背景技术
赤泥是炼铝工业的废渣,因其中含有大量的氧化铁(α-Fe2O3)而呈现赤红色,同时赤泥中也含有大量的其他诸如针铁矿(α-FeOOH)、一水软铝石(γ-AlOOH)、金红石(TiO2)、石英(SiO2)等矿物。目前赤泥大多仍采用筑坝的方式进行堆存,这样不仅造成土地浪费、粉尘污染,而且由于赤泥本身具有强碱性,极易造成土地碱化,污染地下水,甚至因长期堆存会导致溃坝事故,造成安全隐患。故赤泥的资源化综合开发利用、回收有用物质、减少污染,成为炼铝工业面临的迫切任务。目前已经有人开始对赤泥的资源化综合应用进行研究,如中国专利CN 103570120A用赤泥负载氧化铈的方法对赤泥进行改性,应用于水处理领域,获得了良好的效果。专利CN 103420359A将赤泥进行烘干粉碎,催化低碳烃类分解生产碳纳米管,实现了赤泥的高附加值利用。
氢能作为高效、洁净的二次能源,早在20世纪70年代中期就已经受到人们的高度重视。目前氢气的生产方法包括水的光解、电解,甲烷水汽重整反应,氨分解,甲烷部分氧化反应以及生物质汽化等。由于CH4在适当的吸热过程中裂解只产生碳和氢气,不存在CO和CO2,简化了氢气的纯化过程,故近年来,甲烷催化裂解制取高纯氢气受到广泛关注。前人在甲烷裂解研究中广泛使用了贵金属、过渡金属及其氧化物催化剂以及多种金属及其氧化物的复合催化剂,在甲烷裂解研究中获得了良好的效果。虽然贵金属及过渡金属催化剂活性较高,但价格昂贵,且极易中毒失活。
赤泥作为一种工业废弃物,其作为催化剂使用成本极低,且赤泥中含有多种具有催化作用的金属及其氧化物如Fe2O3、Al2O3、TiO2等。将赤泥应用于催化甲烷裂解,既实现了赤泥作为工业废弃物的资源化利用,又解决了甲烷裂解催化剂成本高的问题。
由于赤泥本身的孔隙结构不发达,其作为催化剂使用时反应物往往无法与活性组分充分接触,导致催化效果并不理想。故通过改性手段提高赤泥的催化活性势在必行。
发明内容
本发明的目的是针对上述存在的缺陷,先将赤泥以酸浸过滤碱沉淀的方式进行改性处理,再将其应用于催化甲烷裂解。一方面实现了赤泥的资源化利用,提高了赤泥的催化活性,另一方面解决了甲烷裂解催化剂成本高、制作工艺复杂等问题。
本发明的目的可通过下述技术措施来实现:
本发明的改性赤泥催化甲烷裂解制氢的方法包括以下步骤:
第一步:赤泥的改性处理:
a、将赤泥在100-110℃条件下进行干燥处理,干燥时间为1-6h,之后进行粉碎、过200目筛制成赤泥粉末备用;
b、取过筛后的赤泥粉末,加入无机酸溶液,在无机酸溶液与赤泥粉末的液固比为10-60ml/g条件下使赤泥充分溶解,然后过滤;
c、向滤液中缓慢滴加碱进行沉淀,同时监测溶液的PH值,待PH为7-10时停止加碱,沉淀静置老化时间为0.5-2h;
d、对老化后的沉淀物进行过滤,用去离子水洗涤至中性,之后进行干燥,干燥温度为100-110℃,干燥时间为1-6h;将干燥后的物料研磨成1mm以下颗粒进行煅烧,所选煅烧温度为400-700℃,煅烧时间为1-4h;之后在H2气氛下还原,H2还原时间为0.5-2.5h,H2空速为10-80ml/min·g,还原温度为350-650℃;再研磨过200目筛子即得到改性赤泥催化剂;
第二步:催化甲烷裂解制氢:
a、取改性赤泥催化剂,装填在气固相催化反应床内;
b、向气固相反应床内通入氮气,空速为20-80ml/min·g,升温至裂解温度为600-900℃反应温度关闭氮气,切换至甲烷气体进行甲烷催化裂解制氢;甲烷催化裂解制氢中甲烷空速为40-200ml/min·g。
本发明在赤泥的改性处理过程中所用的无机酸为盐酸或硝酸,浓度为1-6mol/L;加碱沉淀时所用的碱为氨水,质量分数为20-30%。
赤泥的改性处理的b步骤中所述的按液固比10-60ml/g加入无机酸后,进行充分搅拌,然后放入超声清洗器中超声3-10min,再放入恒温水浴锅中在40-90℃条件下恒温加热1-4h,并用机械搅拌器匀速搅拌,搅拌速率为40-120r/min,最后对悬浊液进行真空抽滤。
本发明所用的赤泥为拜耳法赤泥,其主要的物相组成为:赤铁矿(α-Fe2O3)、针铁矿(α-FeOOH)、一水软铝石(γ-AlOOH)、金红石(TiO2)、锐钛矿(TiO2)、石英(SiO2)、方钠石(Na4Al3Si3O12Cl)。
本发明的有益效果如下:
1、通过改性,赤泥中对催化有利的金属氧化物被保留,而对催化不利的CaO和Na2O大为减少。
2、改性后,赤泥的孔隙结构更加发达,提高了比表面积,形成一种颗粒大小较为均一的介孔材料。其催化甲烷裂解制氢活性大为提高,催化剂寿命大大延长。
3、将改性赤泥应用于催化甲烷裂解制氢,既实现了赤泥的高附加值综合利用,又降低了甲烷裂解催化剂的成本,简化了催化剂的制备过程。
附图说明
图1所示为赤泥的透射电镜图片。
图2所示为改性赤泥的透射电镜图片。
图3所示为赤泥改性前后N2-吸附脱附曲线图。
图4所示为赤泥改性前后孔径分布图。
图5所示为实施例1中赤泥改性前后800℃催化CH4裂解制氢转化率曲线图。
图6所示为实施例2中赤泥改性前后750℃催化CH4裂解制氢转化率曲线图。
具体实施方式
本发明以下将结合实施例作进一步描述:
实施例1
本实施例所选用赤泥为拜耳法赤泥。
第一步:赤泥的改性处理:
将赤泥在105℃下烘2h后破碎过200目筛,取20g干燥过筛后的赤泥于1000ml大容器中,向其中加入2mol/L的硝酸溶液600ml,将容器放入超声清洗器中超声5min后取出,放入60℃恒温水浴锅中水浴4h,期间用机械搅拌器以90r/min的转速匀速搅拌;之后对悬浊液进行真空抽滤,得到橙黄色透明溶液,再对溶液滴加质量分数为20%的氨水进行中和沉淀同时用玻璃棒剧烈搅拌,同时检测溶液的PH值,待PH接近8左右时停止滴加氨水;将沉淀静置老化1h再次真空抽滤,用去离子水洗涤沉淀至中性后将其转移至玻璃蒸发皿中于110℃鼓风干燥箱中恒温干燥4h,研磨至1mm以下,置于陶瓷坩埚中于程序升温的马弗炉内450℃煅烧2h,升温速率为5℃/min;将煅烧后的粉末置于垂直放置的气固相催化反应装置中于10ml/min·g 空速的H2气氛下600℃还原2h,取出还原后的粉末研磨过200目筛,即得到改性赤泥催化剂。下面给出赤泥改性前后XRF和N2-吸附的分析结果。赤泥的透射电镜图如图1所示,改性赤泥的透射电镜图如图2所示。赤泥改性前后的N2-吸附脱附曲线图如图3所示,孔径分布曲线图如图4所示。
赤泥改性前后的XRF组成分析:
赤泥改性前后的结构性质分析:
样品 | 比表面积(m2/g) | 总孔容(cm3/g) |
赤泥 | 8 | 0.08 |
改性赤泥 | 122.47 | 0.29 |
第二步:催化甲烷裂解制氢:
取0.5g的改性赤泥催化剂均匀装填在常压气固相催化反应装置内,连接好装置及气体分析仪后进行检漏,通入氮气,空速为40ml/min·g,升温速率为30℃/min,升温至裂解温度为800±5℃反应温度时关闭氮气,切换至甲烷气体进行甲烷催化裂解制氢;调节质量流量计使其流量恒为40ml/min,即空速为80 ml/min·g。甲烷催化裂解制氢的甲烷转化率随时间的变化曲线如图5所示。
甲烷转化率计算公式
其中,为尾气分析仪测定的裂解尾气中的H2百分含量,为相同时刻气体分析仪测定的裂解气中的CH4百分含量。
实施例2
本实施例所选用赤泥为拜耳法赤泥。
第一步:赤泥的改性处理:
将赤泥在110℃下烘2h后破碎过200目筛,取20g干燥过筛后的赤泥于1000ml大容器中,向其中加入2mol/L的硝酸溶液500ml,将容器放入超声清洗器中超声5min后取出,放入65℃恒温水浴锅中水浴4h,期间用机械搅拌器以90r/min的转速匀速搅拌;之后对悬浊液进行真空抽滤,得到橙黄色透明溶液,再对溶液滴加质量分数为30%的氨水进行中和沉淀同时用玻璃棒剧烈搅拌,同时检测溶液的PH值,待PH接近8左右时停止滴加氨水;将沉淀静置老化1.5h再次真空抽滤,用去离子水洗涤沉淀至中性后将其转移至玻璃蒸发皿中于110℃鼓风干燥箱中恒温干燥4h,研磨至1mm以下,置于陶瓷坩埚中于程序升温的马弗炉内800℃煅烧2h,升温速率为5℃/min;将煅烧后的粉末置于垂直放置的气固相催化反应装置中于10ml/min·g 空速的H2气氛下600℃还原2h,取出还原后的粉末研磨过200目筛,即得到改性赤泥催化剂。
第二步:催化甲烷裂解制氢:
取0.5g的改性赤泥催化剂均匀装填在常压气固相催化反应装置内,连接好装置及气体分析仪后进行检漏,通入氮气,空速为20ml/min·g,升温速率为30℃/min,升温至裂解温度为750±5℃反应温度时关闭氮气,切换至甲烷气体进行甲烷催化裂解制氢;调节质量流量计使其流量恒为60ml/min,即空速为120 ml/min·g。甲烷催化裂解制氢的甲烷转化率随时间的变化曲线如图6所示。
甲烷转化率计算公式
其中,为尾气分析仪测定的裂解尾气中的H2百分含量,为相同时刻气体分析仪测定的裂解气中的CH4百分含量。
Claims (3)
1.一种改性赤泥催化甲烷裂解制氢的方法,其特征在于:所述方法包括以下步骤:
第一步:赤泥的改性处理:
a、将赤泥在100-110℃条件下进行干燥处理,干燥时间为1-6h,之后进行粉碎、过200目筛制成赤泥粉末备用;
b、取过筛后的赤泥粉末,加入无机酸溶液,在无机酸溶液与赤泥粉末的液固比为10-60ml/g条件下使赤泥充分溶解,然后过滤;
c、向滤液中缓慢滴加碱进行沉淀,同时监测溶液的PH值,待PH为7-10时停止加碱,沉淀静置老化时间为0.5-2h;
d、对老化后的沉淀物进行过滤,用去离子水洗涤至中性,之后进行干燥,干燥温度为100-110℃,干燥时间为1-6h;将干燥后的物料研磨成1mm以下颗粒进行煅烧,所选煅烧温度为400-700℃,煅烧时间为1-4h;之后在H2气氛下还原,H2还原时间为0.5-2.5h,H2空速为10-80ml/min·g,还原温度为350-650℃;再研磨过200目筛子即得到改性赤泥催化剂;
第二步:催化甲烷裂解制氢:
a、取改性赤泥催化剂,装填在气固相催化反应床内;
b、向气固相反应床内通入氮气,空速为20-80ml/min·g,升温至裂解温度为600-900℃反应温度关闭氮气,切换至甲烷气体进行甲烷催化裂解制氢;甲烷催化裂解制氢中甲烷空速为40-200ml/min·g。
2.根据权利要求1所述的改性赤泥催化甲烷裂解制氢的方法,其特征在于:赤泥的改性处理的b步骤中所述的按液固比10-60ml/g加入无机酸后,进行充分搅拌,然后放入超声清洗器中超声3-10min,再放入恒温水浴锅中在40-90℃条件下恒温加热1-4h,并用机械搅拌器匀速搅拌,搅拌速率为40-120r/min,最后对悬浊液进行真空抽滤。
3.根据权利要求1所述的改性赤泥催化甲烷裂解制氢的方法,其特征在于:在赤泥的改性处理过程中所用的无机酸为盐酸或硝酸,浓度为1-6mol/L;加碱沉淀时所用的碱为氨水,质量分数为20-30%。
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