CN107107040A - 一种担载型固相催化剂及其制备方法和应用 - Google Patents
一种担载型固相催化剂及其制备方法和应用 Download PDFInfo
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Abstract
本发明属于烟气脱硫技术领域,具体涉及一种用于镁法脱硫工艺中副产物亚硫酸镁氧化的担载型固相催化剂及其制备方法和应用。所述催化剂以活性炭颗粒为载体,以硝酸钴,硝酸锰,硝酸铜和硝酸亚铁为催化活性组分。制备方法为:将预处理后的活性炭担体和催化活性组分混合后震荡,微波照射下静置、过滤干燥、烘焙,得到担载型固相催化剂。本发明原料廉价易得,制备工艺简单易行;催化效果显著,可广泛我国75t以上中小型锅炉的镁法脱硫系统,提高脱硫副产物的回收率,降低氧化系统的能耗;催化剂有效成分用量少,溶液低残留,无二次污染问题,具有很高的推广价值。
Description
本发明属于烟气脱硫领域,具体涉及一种用于镁法脱硫工艺中副产物亚硫酸镁氧化的担载型固相催化剂及其制备方法和应用。
镁法脱硫是目前我国中小型工业锅炉常用的烟气处理工艺,其基本原理是以氧化镁的水合溶液为吸收剂,吸收烟气中二氧化硫生成亚硫酸镁,经氧化后生成硫酸镁溶液。该工艺脱硫效率高,投资少、占地小、运行稳定等特点,因此近年来在我国发展迅速。
在实际工艺中,由于镁法脱硫副产物-亚硫酸镁的氧化反应速率相对缓慢,其不充分的氧化率易引起系统结垢、堵塞、产物品质低、排放液二次污染等问题,导致脱硫副产物回收工艺的投资和能耗较高。目前,解决上述问题是通过添加过渡金属催化剂,可在不改变氧化风量的前提下大大提高系统的氧化能力,具有较好的应用前景。但由于催化剂均以溶液形式加入脱硫浆液,导致应用过程的运行成本较高,且催化剂难以回收也必将引起脱硫副产品及外排液中出现重金属二次污染现象,催化剂的应用和推广受到了极大的限制。
发明内容
本发明的目的是提供一种担载型固相催化剂及其制备方法和应用,具体包括:
一种担载型固相催化剂,其特征在于,所述催化剂以活性炭颗粒为载体,以硝酸钴、硝酸锰、硝酸铜和硝酸亚铁为催化活性组分;硝酸钴、硝酸锰、硝酸铜和硝酸亚铁的摩尔比为(2-7)∶(1-4)∶(1-4)∶(1-4)。
所述催化活性组分中的金属离子总量占催化剂的质量百分比为0.01-0.2。
所述活性炭颗粒为煤质球形活性炭、椰壳活性炭、果壳活性炭、木质活性炭、竹质活性炭和煤质柱状活性炭中的一种或多种。
所述活性炭颗粒的粒径为0.1-10mm,平均孔径为1-100nm;所述活性炭颗粒的稳定性和机械强度较好,容易实现催化剂的回收。
如上所述催化剂的制备方法,步骤如下:
(1)将活性炭颗粒在硝酸溶液中加热回流、超声振荡、过滤洗涤至中性后干燥,得到预处理后的活性炭担体;
(2)将得到的活性炭担体与催化活性组分混合后震荡,微波照射下静置、过滤干燥、烘焙,得到担载型固相催化剂。
其中,所述步骤(2)的具体操作为:将得到的活性炭担体浸渍于硝酸钴、硝酸锰、硝酸铜和硝酸亚铁的混合溶液中,在恒温震荡器2000r/min动态浸渍5h,微波照射静置12h,过滤,120℃干燥6h,250℃一次煅烧2h,400℃焙烧3h,得到担载型固相催化剂。
如上所述催化剂的应用,将所述催化剂加入至镁法脱硫副产物氧化系统中,进行亚硫酸镁的氧化反应。
所述镁法脱硫副产物氧化系统中,亚硫酸镁的浓度为10g·L-1-160g·L-1。
本发明的有益效果是同现有技术相比,制备过程简单,操作方便;并具有如下优点:
(1)本发明的担载型固相催化剂原材料活性炭廉价易得,制备工艺简单。
(2)本发明的担载型固相催化剂催化效果显著,亚硫酸镁的氧化速率是非催化条件的4倍以上,解决了脱硫系统因亚硫酸镁浓度过高而导致的结垢和堵塞问题,能够有效应用于镁法脱硫工艺氧化系统的优化。
(3)本发明的担载型固相金属催化剂有效成分用量小,效率高,溶液中残留低,可有效避免二次污染问题,催化剂易回收、重复利用率高,大大降低运行成本,非常适合我国中小型锅炉的镁法脱硫系统,具有推广价值。
图1为活性炭种类不同的担载型固相催化剂用于加速亚硫酸镁氧化时的催化反应效果图。
图2为催化活性组分摩尔比不同的担载型固相催化剂用于加速亚硫酸镁氧化时的催化反应效果图。
图3为不同催化剂浓度的担载型固相催化剂用于加速亚硫酸镁氧化时的催化反应效果图。
图4为不同催化剂粒径的担载型固相催化剂用于加速亚硫酸镁氧化时的催化反应效果图。
本发明提供一种担载型固相催化剂及其制备方法和应用,列举以下实施例对本发明予以说明。
下述实施例使用的活性炭担体预处理如下:将活性炭在50%的浓硝酸中加热回流处理1h,40Hz超声振荡40min,静置,过滤,洗涤至中性,120℃干燥5h,得到活性炭担体以备用。
亚硫酸镁在催化条件下的反应速率的测试方法如下:取一定量的催化剂加入至亚硫酸镁
氧化反应系统中,反应条件为:反应溶液体积200ml,反应温度为45℃,亚硫酸镁初始浓度20g.L-1,pH为8.0,强制鼓入的空气流量60L·h-1。每间隔一段时间测定反应器内硫酸根的浓度,以单位时间内硫酸根生成量表示亚硫酸镁的氧化反应速率,可得亚硫酸镁在催化条件下的反应速率。
1、活性炭颗粒种类不同的催化剂的制备与应用
实施例1
亚硫酸镁氧化反应体系中,不添加任何催化剂,反应溶液体积为200ml,反应温度为45℃,亚硫酸镁初始浓度20g·L-1,pH为8.0,强制鼓入的空气流量60L.h-1,此时反应效率为0.0087mmol/(L·s),如图1中case 0所示。
实施例2
将经过预处理,直径为0.5mm的煤质柱状活性炭(CYC)10.000g放入含Co(NO3)2·6H2O 1.4797g,Mn(NO3)2·4H2O 0.4932g,Fe(NO3)2·9H2O 0.6840g和Cu(NO3)2·3H2O 0.4840g的混合溶液中,在恒温震荡器2000r/min动态浸渍5h,微波照射静置12h,过滤,120℃干燥6h,250℃一次煅烧2h,400℃焙烧3h,得到担载型固相催化剂。
取上述催化剂1g,加入亚硫酸镁氧化反应体系中,反应溶液体积为200ml。此时反应催化效率为0.0207mmol/(L·s),如图1中case 1所示,较非催化条件下提高了3.5倍。
实施例3
将经过预处理,粒径为2-4mm的木质活性炭(WC)10.000g放入含Co(NO3)2·6H2O1.4797g,Mn(NO3)2·4H2O 0.4932g,Fe(NO3)2·9H2O 0.6840g和Cu(NO3)2·3H2O 0.4840g的混合溶液中,在恒温震荡器2000r/min动态浸渍5h,微波照射静置12h,过滤,120℃干燥6h,250℃一次煅烧2h,400℃焙烧3h,得到担载型固相催化剂。
取上述催化剂1g,加入亚硫酸镁氧化反应体系中,反应溶液体积为200ml。此时反应催化效率为0.0260mmol/(L·s),如图1中case 2所示,较非催化条件下提高了2.2倍。
实施例4
将经过预处理,粒径为2-4mm的竹质活性炭(BC)10.000g放入含Co(NO3)2·6H2O1.4797g,Mn(NO3)2·4H2O 0.4932g,Fe(NO3)2·9H2O 0.6840g和Cu(NO3)2·3H2O 0.4840g的混合溶液中,在恒温震荡器2000r/min动态浸渍5h,微波照射静置12h,过滤,120℃干燥6h,250℃一次煅烧2h,400℃焙烧3h,得到担载型固相催化剂。
取上述催化剂1g,加入亚硫酸镁氧化反应体系中,反应溶液体积为200ml。此时反应催化效率为0.0238mmol/(L·s),如图1中case 3所示,较非催化条件下提高了1.73倍。
实施例5
将经过预处理,粒径为2-4mm的椰壳活性炭(CC)10.000g放入含Co(NO3)2·6H2O1.4797g,Mn(NO3)2·4H2O 0.4932g,Fe(NO3)2·9H2O 0.6840g和Cu(NO3)2·3H2O 0.4840g的混合溶液中,在恒温震荡器2000r/min动态浸渍5h,微波照射静置12h,过滤,120℃干燥6h,250℃一次煅烧2h,400℃焙烧3h,得到担载型固相催化剂。
取上述催化剂1g,加入亚硫酸镁氧化反应体系中,反应溶液体积为200ml。此时反应催化效率为0.0282mmol/(L·s),如图1中case 4所示,较非催化条件下提高了1.93倍。
实施例6
将经过预处理,粒径为2-4mm的果壳活性炭(FC)10.000g放入含Co(NO3)2·6H2O1.4797g,Mn(NO3)2·4H2O 0.4932g,Fe(NO3)2·9H2O 0.6840g和Cu(NO3)2·3H2O 0.4840g的混合溶液中,在恒温震荡器2000r/min动态浸渍5h,微波照射静置12h,过滤,120℃干燥6h,250℃一次煅烧2h,400℃焙烧3h,得到担载型固相催化剂。
取上述催化剂1g,加入亚硫酸镁氧化反应体系中,反应溶液体积为200ml。此时反应催化效率为0.0392mmol/(L·s),如图1中case 5所示,较非催化条件下提高了1.37倍。
2、催化活性组分摩尔比不同的催化剂的制备与应用
实施例7
将经过预处理,粒径为2-4mm的果壳活性炭(FC)10.000g放入含Co(NO3)2·6H2O0.2910g,Mn(NO3)2·4H2O 0.2510g,Fe(NO3)2·9H2O 0.3420g和Cu(NO3)2·3H2O 0.2420g(摩尔比为1∶1∶1∶1)的混合溶液中,在恒温震荡器2000r/min动态浸渍5h,微波照射静置12h,过滤,120℃干燥6h,250℃一次煅烧2h,400℃焙烧3h,得到担载型固相催化剂。
取上述催化剂1g,加入亚硫酸镁氧化反应体系中,反应溶液体积为200ml。此时反应催化效率为0.0181mmol/(L·s),如图2中case 1所示,较非催化条件下提高了2.1倍。
实施例8
将经过预处理,粒径为2-4mm的果壳活性炭(FC)10.000g放入含Co(NO3)2·6H2O0.873g,Mn(NO3)2·4H2O 0.7530g,Fe(NO3)2·9H2O 0.6840g和Cu(NO3)2·3H2O 0.4840g(摩尔比为3∶3∶2∶2)的混合溶液中,在恒温震荡器2000r/min动态浸渍5h,微波照射静置12h,过滤,120℃干燥6h,250℃一次煅烧2h,400℃焙烧3h,得到担载型固相催化剂。
取上述催化剂1g,加入亚硫酸镁氧化反应体系中,反应溶液体积为200ml。此时反应催化效率为0.0210mmol/(L·s),如图2中case 2所示,较非催化条件下提高了2.4倍。
实施例9
将经过预处理,粒径为2-4mm的果壳活性炭(FC)10.000g放入含Co(NO3)2·6H2O1.1640g,Mn(NO3)2·4H2O 0.5020g,Fe(NO3)2·9H2O 0.6840g和Cu(NO3)2·3H2O 0.4840g(摩尔比为4∶2∶2∶2)的混合溶液中,在恒温震荡器2000r/min动态浸渍5h,微波照射静置12h,过滤,120℃干燥6h,250℃一次煅烧2h,400℃焙烧3h,得到担载型固相催化剂。
取上述催化剂1g,加入亚硫酸镁氧化反应体系中,反应溶液体积为200ml。此时反应催化效率为0.0280mmol/(L·s),如图2中case 3所示,较非催化条件下提高了3.2倍。
实施例10
将经过预处理,粒径为2-4mm的果壳活性炭(FC)10.000g放入含Co(NO3)2·6H2O1.4550g,Mn(NO3)2·4H2O 0.4932g,Fe(NO3)2·9H2O 0.6840g和Cu(NO3)2·3H2O 0.4840g(摩尔比为5∶2∶2∶1)的混合溶液中,在恒温震荡器2000r/min动态浸渍5h,微波照射静置12h,过滤,120℃干燥6h,250℃一次煅烧2h,400℃焙烧3h,得到担载型固相催化剂。
取上述催化剂1g,加入亚硫酸镁氧化反应体系中,反应溶液体积为200ml。此时反应催化效率为0.0332mmol/(L·s),如图2中case 1所示,较非催化条件下提高了3.8倍。
实施例11
将经过预处理,粒径为2-4mm的果壳活性炭(FC)10.000g放入含Co(NO3)2·6H2O2.0370g,Mn(NO3)2·4H2O 0.2510g,Fe(NO3)2·9H2O 0.3420和Cu(NO3)2·3H2O 0.2420g(摩尔比为7∶1∶1∶1)的混合溶液中,在恒温震荡器2000r/min动态浸渍5h,微波照射静置12h,过滤,120℃干燥6h,250℃一次煅烧2h,400℃焙烧3h,得到担载型固相催化剂。
取上述催化剂1g,加入亚硫酸镁氧化反应体系中,反应溶液体积为200ml。此时反应催化效率为0.0391mmol/(L·s),如图2中case 1所示,较非催化条件下提高了4.5倍。
3、不同浓度催化剂的制备与应用
实施例12
将经过预处理,粒径为2-4mm的果壳活性炭(FC)10.000g放入含Co(NO3)2·6H2O2.0370g,Mn(NO3)2·4H2O 0.2510g,Fe(NO3)2·9H2O 0.3420和Cu(NO3)2·3H2O 0.2420g(摩尔比为7∶1∶1∶1)的混合溶液中,在恒温震荡器2000r/min动态浸渍5h,微波照射静置12h,过滤,120℃干燥6h,250℃一次煅烧2h,400℃焙烧3h,得到担载型固相催化剂。
取上述催化剂0.5g,加入亚硫酸镁氧化反应体系中,反应溶液体积为200ml。此时反应催化效率为0.0299mmol/(L·s),如图3中case 1所示,较非催化条件下提高了3.4倍。
实施例13
将经过预处理,粒径为2-4mm的果壳活性炭(FC)10.000g放入含Co(NO3)2·6H2O
2.0370g,Mn(NO3)2·4H2O 0.2510g,Fe(NO3)2·9H2O 0.3420和Cu(NO3)2·3H2O 0.2420g(摩尔比为7∶1∶1∶1)的混合溶液中,在恒温震荡器2000r/min动态浸渍5h,微波照射静置12h,过滤,120℃干燥6h,250℃一次煅烧2h,400℃焙烧3h,得到担载型固相催化剂。
取上述催化剂1g,加入亚硫酸镁氧化反应体系中,反应溶液体积为200ml。此时反应催化效率为0.0342mmol/(L·s),如图3中case 2所示,较非催化条件下提高了3.9倍。
实施例14
将经过预处理,粒径为2-4mm的果壳活性炭(FC)10.000g放入含Co(NO3)2·6H2O2.0370g,Mn(NO3)2·4H2O 0.2510g,Fe(NO3)2·9H2O 0.3420和Cu(NO3)2·3H2O 0.2420g(摩尔比为7∶1∶1∶1)的混合溶液中,在恒温震荡器2000r/min动态浸渍5h,微波照射静置12h,过滤,120℃干燥6h,250℃一次煅烧2h,400℃焙烧3h,得到担载型固相催化剂。
取上述催化剂2g,加入亚硫酸镁氧化反应体系中,反应溶液体积为200ml。此时反应催化效率为0.0457mmol/(L·s),如图3中case 3所示,较非催化条件下提高了5.3倍。
实施例15
将经过预处理,粒径为2-4mm的果壳活性炭(FC)10.000g放入含Co(NO3)2·6H2O2.0370g,Mn(NO3)2·4H2O 0.2510g,Fe(NO3)2·9H2O 0.3420和Cu(NO3)2·3H2O 0.2420g(摩尔比为7∶1∶1∶1)的混合溶液中,在恒温震荡器2000r/min动态浸渍5h,微波照射静置12h,过滤,120℃干燥6h,250℃一次煅烧2h,400℃焙烧3h,得到担载型固相催化剂。
取上述催化剂4g,加入亚硫酸镁氧化反应体系中,反应溶液体积为200ml。此时反应催化效率为0.0558mmol/(L·s),如图3中case 4所示,较非催化条件下提高了6.4倍。
实施例16
将经过预处理,粒径为2-4mm的果壳活性炭(FC)10.000g放入含Co(NO3)2·6H2O2.0370g,Mn(NO3)2·4H2O 0.2510g,Fe(NO3)2·9H2O 0.3420和Cu(NO3)2·3H2O 0.2420g(摩尔比为7∶1∶1∶1)的混合溶液中,在恒温震荡器2000r/min动态浸渍5h,微波照射静置12h,过滤,120℃干燥6h,250℃一次煅烧2h,400℃焙烧3h,得到担载型固相催化剂。
取上述催化剂8g,加入亚硫酸镁氧化反应体系中,反应溶液体积为200ml。此时反应催化效率为0.0781mmol/(L·s),如图3中case 5所示,较非催化条件下提高了9.0倍。
4、不同活性炭颗粒粒径的催化剂的制备与应用
实施例17
将经过预处理,粒径为0.5-1mm的果壳活性炭(FC)10.000g放入含Co(NO3)2·6H2O2.0370g,Mn(NO3)2·4H2O 0.2510g,Fe(NO3)2·9H2O 0.3420和Cu(NO3)2·3H2O 0.2420g(摩
尔比为7∶1∶1∶1)的混合溶液中,在恒温震荡器2000r/min动态浸渍5h,微波照射静置12h,过滤,120℃干燥6h,250℃一次煅烧2h,400℃焙烧3h,得到担载型固相催化剂。
取上述催化剂1g,加入亚硫酸镁氧化反应体系中,反应溶液体积为200ml。此时反应催化效率为0.0349mmol/(L·s),如图4所示,较非催化条件下提高了3.9倍。
实施例18
将经过预处理,粒径为1-2mm的果壳活性炭(FC)10.000g放入含Co(NO3)2·6H2O2.0370g,Mn(NO3)2·4H2O 0.2510g,Fe(NO3)2·9H2O 0.3420和Cu(NO3)2·3H2O 0.2420g(摩尔比为7∶1∶1∶1)的混合溶液中,在恒温震荡器2000r/min动态浸渍5h,微波照射静置12h,过滤,120℃干燥6h,250℃一次煅烧2h,400℃焙烧3h,得到担载型固相催化剂。
取上述催化剂1g,加入亚硫酸镁氧化反应体系中,反应溶液体积为200ml。此时反应催化效率为0.0306mmol/(L·s),如图4所示,较非催化条件下提高了3.5倍。
实施例19
将经过预处理,粒径为2-4mm的果壳活性炭(FC)10.000g放入含Co(NO3)2·6H2O2.0370g,Mn(NO3)2·4H2O 0.2510g,Fe(NO3)2·9H2O 0.3420和Cu(NO3)2·3H2O 0.2420g(摩尔比为7∶1∶1∶1)的混合溶液中,在恒温震荡器2000r/min动态浸渍5h,微波照射静置12h,过滤,120℃干燥6h,250℃一次煅烧2h,400℃焙烧3h,得到担载型固相催化剂。
取上述催化剂1g,加入亚硫酸镁氧化反应体系中,反应溶液体积为200ml。此时反应催化效率为0.0217mmol/(L·s),如图4所示,较非催化条件下提高了2.5倍。
实施例20
将经过预处理,粒径为4-6mm的果壳活性炭(FC)10.000g放入含Co(NO3)2·6H2O2.0370g,Mn(NO3)2·4H2O 0.2510g,Fe(NO3)2·9H2O 0.3420和Cu(NO3)2·3H2O 0.2420g(摩尔比为7∶1∶1∶1)的混合溶液中,在恒温震荡器2000r/min动态浸渍5h,微波照射静置12h,过滤,120℃干燥6h,250℃一次煅烧2h,400℃焙烧3h,得到担载型固相催化剂。
取上述催化剂1g,加入亚硫酸镁氧化反应体系中,反应溶液体积为200ml。此时反应催化效率为0.0206mmol/(L·s),如图4所示,较非催化条件下提高了2.4倍。
Claims (9)
- 一种担载型固相催化剂,其特征在于,所述催化剂以活性炭颗粒为载体,以硝酸钴、硝酸锰、硝酸铜和硝酸亚铁为催化活性组分;硝酸钴、硝酸锰、硝酸铜和硝酸亚铁的摩尔比为(2-7)∶(1-4)∶(1-4)∶(1-4)。
- 根据权利要求1所述的担载型固相催化剂,其特征在于,所述催化剂中,催化活性组分中的金属离子总量占催化剂的质量百分比为0.01-0.2。
- 根据权利要求1所述的担载型固相催化剂,其特征在于,所述活性炭颗粒为煤质球形活性炭、椰壳活性炭、果壳活性炭、木质活性炭、竹质活性炭和煤质柱状活性炭中的一种或多种。
- 根据权利要求1所述的担载型固相催化剂,其特征在于,所述活性炭颗粒的粒径为0.1-10mm,平均孔径为1-100nm。
- 权利要求1-4任一项所述催化剂的制备方法,其特征在于,步骤如下:(1)将活性炭颗粒在硝酸溶液中加热回流、超声振荡、过滤洗涤至中性后干燥,得到预处理后的活性炭担体;(2)将得到的活性炭担体与催化活性组分混合后震荡,微波照射下静置、过滤干燥、烘焙,得到担载型固相催化剂。
- 根据权利要求5所述的制备方法,其特征在于,所述步骤(2)的具体操作为:将得到的活性炭担体浸渍于硝酸钴、硝酸锰、硝酸铜和硝酸亚铁的混合溶液中,在恒温震荡器2000r/min动态浸渍5h,微波照射静置12h,过滤,120℃干燥6h,250℃一次煅烧2h,400℃焙烧3h,得到担载型固相催化剂。
- 根据权利要求6所述的制备方法,其特征在于,所述混合溶液中,硝酸钴的浓度为0.001-0.102mol/L,硝酸锰的浓度为0.001-0.051mol/L,硝酸铜的浓度为0.001-0.075mol/L,硝酸亚铁的浓度为0.001-0.045mol/L。
- 权利要求1或2任一项所述催化剂的应用,其特征在于,将所述催化剂加入至镁法脱硫副产物氧化系统中,进行亚硫酸镁的氧化反应。
- 根据权利要求8所述的应用,其特征在于,所述镁法脱硫副产物氧化系统中,亚硫酸镁的浓度为10g·L-1-160g·L-1。
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