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时间:2020-04-05
《基于CaAl—LDHs前体的蒽醌降解物再生固体碱催化剂.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、石油化工·10·PETR0CHEMICALTECHN0L0GY2016年第45卷第1期DOI:10.3969~.issn.1000—8144.2016.01.002基于CaAI—LDHs前体的蒽醌降解物再生固体碱催化剂关超阳,冯俊婷,洪润润,李殿卿(北京化工大学化工资源有效利用国家重点实验室,北京100029)[摘要]以尿素为沉淀剂,采用水热合成法在球形—A1O载体表面原位合成CaA1一NO一LDHs(LDHs:层状复合金属氢氧化物),焙烧后得到caA1一LDO/7一A120固体碱催化剂(LDO:层状双金属复合氧化物)。采用XRD,SEM,BET,CO,一TPD方法对催化剂进行了
2、表征,并考察了催化剂对蒽醌降解物的再生性能。表征结果显示,当CaO负载量低于20%(W)时,催化剂仍保持较高的比表面积和丰富的孔结构,且表面碱量随CaO负载量的增加而增加;当CaO负载量超过20%(W)时,催化剂的比表面积减小,孔道被堵塞,表面碱量降低。实验结果表明,CaO负载量为20%(W)的0.20一CaA1一LDO/7一A1,O催化剂对蒽醌降解物的再生性能最佳,与浸渍法制备的O.20一CaO/7一A1:O3和水热合成法制备的O.20一MgA1一LDO/7一AIO催化剂相比,O.20一CaA1一LDO/7一A1O催化剂的蒽醌降解物再生活性分别提高了76.9%和18.O%。[关
3、键词]原位合成;层状复合金属氢氧化物;固体碱催化剂;蒽醌降解物;再生[文章编号]1000—8144(2016)01—0010—07[中图分类号]TQ426.6[文献标志码1ASolidbasecatalystsderivedfromCaA!-LDHsforregenerationofanthraquin0nedegradationproductsGuanChaoyang,FengJunting,HongRunrun.LiDianqing(StateKeyLaboratoryofChemicalResourceEngineering,BeijingUniversityofChemi
4、calTechnology,Beijing100029,China)lAbstract]AseriesofCaA1-NO3-LDHs(LDHs:layereddoublehydroxides)weresynthesizedinsituonthesurfaceofspherical1,一A12O3withureaasprecipitantandthenCaA1一LDO/7一AI2O3(LDO:layereddoubleoxides)solidbasecatalystswerepreparedthroughthecalcinationofCaA1一NO3一LDHs.TheCaA1-L
5、DO/7一A1203catalystswerecharacterizedbymeansofXRD,SEM,lowtemperatureN2adsorption—desorptionandCO2-TPD.WhenCaOloadingwaslowerthan20%(w),theCaA1一LDO/1,一Al2O3catalystskepthighspecificsurfaceareaandmesoporousstructure,andtheirsurficialbasicityincreasedwithincreasingtheCaOloading.WhenCaOloadingwash
6、igherthan20%(w),thespecificsurfacearea,porevolumeandbasicityofthecatalystsdecreasedwithincreasingtheCaOloading.TheCaA1一LDO/7一A12O3catalystswereusedtoregenerateanthraquinonedegradationproductswhichwereproducedintheproductionofhydrogenperoxidebytheanthraquinonemethod.WhenCaOloadingwas20%(w),the
7、catalystexhibitedthehighestanthraquinoneregenerationperformance.ComparedtO0.20一CaO/y-A12O3preparedbyimpregnationand0.20一MgA1-LDO/y-A1203preparedbyinsitusynthesis,theactivityofthe0.20一CaA1一LDO/7一A12O3catalystintheregenerationoftheanthraquinone
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