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时间:2020-03-26
《SiC催化燃烧甲烷性能.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、物理化学学~E(WutiHuaxueXuebao)OctoberActaP.一Chim.Sin.2014,30(10),194l一19461941[Article]doi:10.3866/PKU.WHXB201408181www.whxb.pku.edu.cnCeZr0.5O2修饰的Ni/SiC、Fe/SiC和Co/SiC催化燃烧甲烷性能焦志锋董莉莉郭晓宁,靳国强郭向云王晓敏(。太原理工大学材料科学与工程学院,太原030024;中国科学院山西煤炭化学研究所煤转化国家重点实验室,太原030001)摘要:以铈锆固溶体(Ce。5zr0
2、2)修饰的高比表面积SiC为载体,采用两步浸渍法制备了Ni、Fe和Co基催化剂,研究了其在煤层气催化燃烧脱氧中的催化活性和稳定性.利用X射线衍射(XRD)、X射线光电子能谱(XPS)、电感耦合等离子体质谱(ICP.MS)、高分辨透射电子显微镜(HRTEM)、比表面积(BET)、热重分析(TGA)和H程序升温还原(H-TPR)对催化剂进行了表征.分析结果表明,Ni、Fe和Co部分进入CeZrO固溶体晶格内部,导致催化剂体相形成更多的缺陷:同时Ce。5zr00固溶体有助于加速金属氧化物和金属之间氧化还原过程的进行,促进了氧吸附、传输
3、和对甲烷的活化.另外,SiC和Ce。5zr002固熔体良好的抗积碳性能,有效避免了催化剂在富甲烷反应气氛中因积碳而失活,从而使三种催化剂均具有优良的催化燃烧脱氧活性和稳定性.其中,Co/CeoO/SiC活性最高,可在320。C活化催化甲烷,并在410。C实现完全脱氧.关键词:高比表面碳化硅:过度金属催化flY;铈锆固溶体:甲烷催化燃烧;煤层气脱氧中图分类号:0643MethaneCatalyticCombustionoverNi/SiC,Fe/SiCandCo/SiCModifiedbyZr0.5Ce0.502SolidSolu
4、tionJIAOZhi—Feng’一DONGLi-LiGUOXiao—Ning’JINGuo-QiangGUOXiang—YunWANGXiao-Min’'rCollegeofMaterialsScienceandEngineering,TaiyuanUniversityofTechnology,Taiyuan030024,R.China;。StateKeyLaboratoryofCoalConversion,InstituteofCoalChemistry,ChineseAcademyofSciences,Taiyuan030
5、001,PR.China)Abstract:WeusedZro5Ceo502solidsolutionmodifiedhighspecificsurfaceareaSiCasthecatalystsupportandsynthesizedNi/Ce05zr05OJSiC,Fe/Ceo5zr05OJSiC,andCo/Ce0uZro5OJSiCcatalystsbyatwo—stepimpregnationmethod.Thecatalyticactivityandstabilitywereinvestigatedinthecat
6、alyticcombustiondeoxidationofcoal-bedgas.Theas-preparedcatalystswerecharacterizedbyX-raydi仟raction(XRD),X-rayphotoelectronspectroscopy(XPS),inductivelycoupledplasma-massspectroscopy(ICP·MS),high-resolutiontransmissionelectronmicroscope(HRTEM),Brunner-Emmet-TeIler(BET
7、)measurements,thermalgravimetricanalysis(TGA),andtemperature—programmedreductionofH2(H2-TPR).TheresultssuggestthatpartialdifusionofNi,Fe,andCototheCe0.5Zr05O2latticeIeadstotheformationofdefectsinthecatalystbulkphase.CeD-5Zro502increasedtheredoxprocessbetweenmetalsand
8、theiroxides,improvingtheoxygenstorage,mobilitycapacity,andtheactivationofCH.1naddition.theexcellentresistanceofbothSiCandCe05Zr05O2
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