CN114632509B - 采用铝铬渣制备Cr-Al2O3介孔催化材料的方法及应用 - Google Patents
采用铝铬渣制备Cr-Al2O3介孔催化材料的方法及应用 Download PDFInfo
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Abstract
本发明公开了采用铝铬渣制备Cr‑Al2O3介孔催化材料的方法,该方法是将铝铬渣、硝酸钠、氢氧化钠混合均匀后,置于400~500℃下焙烧4~6小时,得到热处理料,将热处理料与水混合后,在40~80℃下搅拌1h~3h,抽滤分离,得到滤渣和滤液;调节滤液pH为5~9,静置24~48h,抽滤分离,将滤渣烘干后置于300℃~600℃下焙烧120~500min,制得Cr‑Al2O3介孔催化材料;本发明方法工艺简单、成本低、不仅达到了铝铬渣无害化处理目的,还为甲硫醇分解提供了新的途径,本发明方法适用于工业化生产和市场推广利用。
Description
技术领域
本发明属于铝铬渣资源化利用的技术领域,具体涉及一种以铝铬渣为原料制备Cr-Al2O3介孔催化材料的方法。
背景技术
铝铬渣是铝热还原法冶铬过程中产生的一种固体废弃物。国内主要采用铝热还原冶炼法生产金属铬,因而产生大量铝铬渣,对环境和人类健康产生危害,铝铬渣易变为粉末进入空气,对大气造成污染;铝铬渣长期堆放不仅占用土地、使土壤变质,而且风吹雨淋后会形成和浸出强毒性Cr(VI)。故对铝铬渣妥当处置十分必要。铝铬渣中含有丰富的Al、Cr元素,资源属性明显,极具开发价值,特别是在铝、铬资源紧缺,严重依赖进口的当代中国。因此,对铝铬渣进行无害化资源循环再利用是国家绿色发展的战略需求。
铬基催化剂作为一种成熟的催化剂体系,已被广泛应用于各类催化反应,如VOCs的催化分解、丙烷脱氢、NO氧化和乙烯聚合反应等。
发明内容
本发明不仅实现了铝铬渣的解毒无害化,而且给铝铬渣的高值资源化综合利用提供了新思路,同时高效分解了甲硫醇,缓解了铝铬渣和甲硫醇对环境的危害。本发明不仅技术上可行,可获得良好的经济、社会和环境效益,而且具有较高的创新性和研究价值。
为实现上述目的,本发明所采用的技术方案是:
(1)按铝铬渣:硝酸钠:氢氧化钠的质量比为2:(1~2):(4~12)的比例,将铝铬渣、硝酸钠、氢氧化钠混合均匀后,置于400~500℃下焙烧4~6小时,得到热处理料;
(2)将热处理料与水混合后,在40~80℃下搅拌1h~3h,抽滤分离,得到滤渣和滤液,其中热处理料与水的质量比为1:80~110;
(3)调节滤液pH为5~9,静置24~48h,抽滤分离,将滤渣烘干后置于300℃~600℃下焙烧120~500min,制得Cr-Al2O3介孔催化材料,采用硝酸调节pH;
所述铝铬渣为铝热法冶炼金属铬所产生的炉渣,铝铬渣的主要化学成分为Al2O3 65~80%、Cr2O3 5~10%、CaO 2~5%、NaO 2~5%。
所述硝酸钠纯度≥99%。
所述氢氧化钠纯度≥96%。
本发明另一目的是将上述方法制得的Cr-Al2O3介孔催化材料应用在甲硫醇分解中。
本发明具有如下的技术效果:
本发明用铝铬渣作为铝源和铬源,不仅达到了铝铬渣无害化处理目的,而且实现了铝铬渣的精细化、高附加值综合利用,同时给Cr-Al2O3介孔催化材料的制备提供了廉价原料;原料简单易取,成本便宜,适合大规模生产,且对环境友好;
本发明利用制得的Cr-Al2O3介孔催化材料对甲硫醇进行分解,能高效催化分解有机污染物甲硫醇,达到以废治废,充分利用资源的目的,社会效益和经济效益显著。
且本发明方法工艺简单、成本低、资源利用率高、对设备无特殊要求的特点,适用于工业化生产和市场推广利用。
附图说明
图1为实施例1介孔材料的孔径分布图和氮气吸脱附曲线;
图2为实施例2介孔材料的孔径分布图和氮气吸脱附曲线;
图3为实施例3介孔材料的孔径分布图和氮气吸脱附曲线;
图4为实施例4介孔材料的孔径分布图和氮气吸脱附曲线;
图5为Cr-Al2O3介孔催化材料的SEM图;
图6为Cr-Al2O3介孔催化材料催化甲硫醇分解结果示意图。
具体实施方式
下面结合具体实施方式对本发明作进一步的描述,并非对本发明保护范围的限制,实施例中铝铬渣的主要化学成分为Al2O3 65~80%、Cr2O3 5~10%、CaO 2~5%、NaO 2~5%;所硝酸钠纯度≥99%,所述氢氧化钠纯度≥96%,硝酸的体积浓度为50%;
实施例1
1、按铝铬渣:硝酸钠:氢氧化钠的质量比为1:1:6的比例,将铝铬渣、硝酸钠、氢氧化钠混合研磨得到均匀的混合料,放入坩埚中,在450℃马弗炉中保温4h,得到热处理料;
2、按热处理料与水的质量比为1:100比例,将热处理料与水混合,在50℃水浴锅中搅拌2h,冷却后抽滤分离,收集滤液;
3、向滤液中加入硝酸调节pH=6,静置48h,抽滤分离,将过滤沉淀烘干,研磨成粉,再放置于马弗炉中,以1℃/min的升温速率升至400℃保持200min,再以1℃/min的降温温速率降至室温,得到Cr-Al2O3介孔催化材料;通过全自动BET比表面分析测试仪的测定,该Cr-Al2O3介孔催化材料的比表面积为477.3m2/g,见图1,表1;Cr-Al2O3介孔催化材料的SEM图见图5,可以看出,材料形貌呈现珊瑚状结构, 疏松多孔,与 N2-吸脱附表征的高比表面积结果吻合。
采用本实施例Cr-Al2O3介孔催化材料催化甲硫醇分解,测试常压下 Cr-Al2O3介孔材料对甲硫醇催化分解的性能,将0.2g Cr-Al2O3介孔催化材料置于固定床反应器中,然后通入含0.5%甲硫醇的气体(N2为载气),流速30mL/min,反应温度为 250-450℃,检测分解后气体中甲硫醇含量,结果见图6,从图中可以看出当反应温度从 250℃升高到300℃时,甲硫醇的转化率从77%急剧增加到99.89%,随后再将反应温度进一步升高到350、400、450℃时,其转化率一直稳定在100%。可见该 Cr- Al2O3介孔材料对甲硫醇分解拥有优异的低温催化活性。
实施例2
1、按铝铬渣:硝酸钠:氢氧化钠的质量比为5:4:20的比例,将铝铬渣、硝酸钠、氢氧化钠混合研磨得到均匀的混合料,放入坩埚中,在400℃马弗炉中保温6h,得到热处理料;
2、按热处理料与水的质量比为1:90比例,将热处理料与水混合,在80℃水浴锅中搅拌1h,冷却后抽滤分离,收集滤液;
3、向滤液中加入硝酸调节pH=5,静置25h,抽滤分离,将过滤沉淀烘干,研磨成粉,再放置于马弗炉中,以1℃/min的升温速率升至400℃保持500min,再以1℃/min的降温温速率降至室温,得到Cr-Al2O3介孔催化材料;通过全自动BET比表面分析测试仪的测定,该Cr-Al2O3介孔催化材料的比表面积为342.2m2/g,见图2,表1。
实施例3
1、按铝铬渣:硝酸钠:氢氧化钠的质量比为10:9:50的比例,将铝铬渣、硝酸钠、氢氧化钠混合研磨得到均匀的混合料,放入坩埚中,在500℃马弗炉中保温4h,得到热处理料;
2、按热处理料与水的质量比为1:80比例,将热处理料与水混合,在70℃水浴锅中搅拌1.5h,冷却后抽滤分离,收集滤液;
3、向滤液中加入硝酸调节pH=7,静置24h,抽滤分离,将过滤沉淀烘干,研磨成粉,再放置于马弗炉中,以1℃/min的升温速率升至500℃保持300min,再以1℃/min的降温温速率降至室温,得到Cr-Al2O3介孔催化材料;通过全自动BET比表面分析测试仪的测定,该Cr-Al2O3介孔催化材料的比表面积为376.7m2/g,见图3,表1。
实施例4
1、按铝铬渣:硝酸钠:氢氧化钠的质量比为5:4:30的比例,将铝铬渣、硝酸钠、氢氧化钠混合研磨得到均匀的混合料,放入坩埚中,在450℃马弗炉中保温5h,得到热处理料;
2、按热处理料与水的质量比为1:110比例,将热处理料与水混合,在50℃水浴锅中搅拌3h,冷却后抽滤分离,收集滤液;
3、向滤液中加入硝酸调节pH=8,静置35h,抽滤分离,将过滤沉淀烘干,研磨成粉,再放置于马弗炉中,以1℃/min的升温速率升至300℃保持400min,再以1℃/min的降温温速率降至室温,得到Cr-Al2O3介孔催化材料;通过全自动BET比表面分析测试仪的测定,该Cr-Al2O3介孔催化材料的比表面积为444.8m2/g,见图4,表1;
表1
Claims (4)
1.一种采用铝铬渣制备Cr-Al2O3介孔催化材料的方法,其特征在于:将铝铬渣、硝酸钠、氢氧化钠混合均匀后,置于400~500℃下焙烧4~6小时,得到热处理料,将热处理料与水混合后,在40~80℃下搅拌1h~3h,冷却后抽滤分离,收集滤液;调节滤液pH为5~9,静置24~48h,抽滤分离,将过滤沉淀烘干,研磨成粉,置于300℃~600℃下焙烧120~500min,制得Cr-Al2O3介孔催化材料;
其中铝铬渣:硝酸钠:氢氧化钠的质量比为2:(1~2):(4~12)。
2.根据权利要求1所述的采用铝铬渣制备Cr-Al2O3介孔催化材料的方法,其特征在于:硝酸钠纯度≥99%。
3.根据权利要求1所述的采用铝铬渣制备Cr-Al2O3介孔催化材料的方法,其特征在于:氢氧化钠纯度≥96%。
4.权利要求1-3任一项所述的采用铝铬渣制备Cr-Al2O3介孔催化材料的方法制得的Cr-Al2O3介孔催化材料在甲硫醇分解中的应用。
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