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时间:2020-03-26
《含镍WPMCM-41催化剂二苯并噻吩加氢脱硫性能.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、第39卷第12期燃料化学学报VO1.39No.122011年12月JournalofFuelChemistryandTechnologyDec.2011文章编号:0253-2409(2011)12-0930-06含镍WP/MCM-41催化剂二苯并噻吩加氢脱硫性能李翠清,潘雅妹,李继文,王虹,靳广州,孙桂大(北京石油化工学院绿色化学与催化材料研究所,北京102617)摘要:以MCM-41为载体,以镍(Ni)为助剂,制备了Ni含量不同的WP/MCM-41催化剂。采用XRD、BET、SEM和XPS对催化剂进行了表征;以二苯并
2、噻吩(DBT)为模型化合物,通过高压微反装置考察催化剂的加氢脱硫(HDS)活性。结果表明,Ni的加入促进了活性组分WP的生长并使其晶相尺寸略有增加,一定含量的Ni有利于提高催化剂的比表面积。Ni对WP/MCM-41催化剂二苯并噻吩HDS反应具有促进作用。少量Ni的加入有利于WP活性相的生成并增加了活性位的数量;加入过量的Nj,在催化剂中形成了具有一定活性的类似Ni—W—P结构的物种,减少了活性组分WP所占的比例,从而使催化剂DBT的HDS活性降低。其中,Ni的质量分数为1%的催化剂(cat-Ni—I)具有相对较高活性,
3、其DBT脱硫率和转化率分别为76.78%和72.16%,比不加Ni的催化剂分别提高了30.04%和21.62%。二苯并噻吩在WP/MCM-41催化剂上以加氢脱硫途径为主,Ni的加入对提高加氢脱硫途径选择性起到了促进作用,且加氢脱硫选择性随Ni含量的增加而提高。关键词:加氢脱硫;二苯并噻吩;磷化钨;MCM-41;助剂;镍中图分类号:TQ426.9文献标识码:APerformanceofdibenzothiophenehydrodesulfurizationforWP/MCM一41catalystcontainingpro
4、moternickelLICui—qing,PANYa.mei.LIJi—wen,WANGHong,JINGuang.zhou,SUN(i.da(TheGreenChemistryandCatalysisMaterialsLaboratory,BeijingInstituteofPetrochemicalTechnology,Beijing102617,China)Abstract:Thesupportedtungstenphosphidecatalystswithdifferentcontentofnicklewer
5、epreparedoverMCM一41.ThesampleswerecharacterizedbyX.raydiffraction(XRD)。BETspecificsurfacearea.scanningelectronmicroscopy(SEM)andX—rayphotoelectronspectroscopy(XPS)methods.Thedibenzothiophene(DBT)hydrodesulfurization(HDS)performanceofcatalystswasevaluatedinafixde
6、.bedreactorat633K.3MPaH,andwithaspacevelocityof4h~.TheresultsshowedthattheadditionofNipromotedthegrowthofactivespeciesWPandincreasedWPcrystaldimension.SomecontentofnickelwasfavortoincreasetheBETspecificsurfaceareaofcatalyst.NihadpositiveeffectsontheDBTHDlSreacti
7、onofWP/MCM_41catalysts.WPwasthemainactivephase.Theadditionofsmallamount(1%)ofnicklewasfavortotheformationofWPactivephaseandincreasedtheactivesitenumber.Theadditionofexcesscontent(5%.9%)ofnickelprobablyconducedtheformationofanewactivespecieswithsimilarstructureof
8、Ni—W—P.whichdecreasedtheproportionofactivephaseonthecatalystsurfaceandresultedinthedeclineofcatalyticactivity.Particularly.thecatalystwithnickelcontentof1%hadhighHDSa
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