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时间:2020-03-26
《氟添加方式对NiMo催化剂在浆态床上加氢脱硫性能的影响.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、物理化学学报(WuliHuaxueXuebao1AugustActa尸.一.Sin.2015,31(8),1559—15661559【Article】doi:10.3866/PKU.WHXB201506083www.whxb.pku.edu.cn氟添加方式对NiMo催化剂在浆态床上加氢脱硫性能的影响石林黄伟宋书征李志博刘.双强(太原理工大学,煤科学与技术教育部和山西省重点实验室,太原030024)摘要:以F为助剂,采用完全液相法制备了氟改性的NiMo/Ti02一AI:O,浆状催化剂,考察了氟的添加方式对催化剂在浆态床上4,6一二甲基二苯并
2、噻吩(4,6一DMDBT))J[I氢脱硫性能的影响.采用X射线衍射(XRD)谱、氢气程序升温还原(H2-TPR)、N吸脱附实验(BET)、X射线光电子能谱(xPs)、高分辨率透射电镜(HRTEM)对催化剂进行了表征.结果表明,在不添加浓硝酸的情况下,在活性组分加入之前引入氟能显著提高催化剂的比表面积和孔径,促进反应过程中金属镍在催化剂表面的分散,更大程度地减弱催化剂中活性金属与载体间的相互作用,有效提高Mo的硫化度及MoS的堆积层数,从而生成了较多的ll类Ni.Mo.S活性相,促进芳香环的加氢和C~S键的氢解,对4,6-DMDBT有较高的
3、加氢脱硫活性.关键词:完全液相法:氟:4,6-二甲基二苯并噻吩:浆态床中图分类号:0643E仟bctoftheFluorineAdditionMethodontheHydrOdeSUIfUrizationPerformanceofNiMoCatalystsoverSlurryBedSHILinHUANGWeiSONGShu-ZhengLIZhi·BoLIUShuang-Qiang(KeyLaboratoryofCoalScienceandTechnologyofMin&tryofEducationandShanxiProvince,Tai
4、yuanUniversityofTechnology,Taiyuan030024,PR.China、Abstract:NiMo/TiO2-AI2O3slurrycatalystswithfluorineasanadditivewerepreparedbycompleteliquid.phasetechnologyforhydrodesulfurization.Theeffectofdifferentfluorineadditionmethodsonthepropertiesofthecatalystsfor4,6-dimethyldibe
5、nzothiophene(4,6一DMDBT)hydrodesuIfurizationwereinvestigated.ThecatalystswerecharacterizedbyX-raydiffraction(XRD),temperature-programmedreductionofH2(H2-TPR),N2adsorption—desorptionisotherms(BET),X-rayphotoelectronspectroscopy(XPS),andhigh.resolutiontransmissionelectronmic
6、roscopy(HRTEM).Theresultsrevealthatintheabsenceofnitricacid,addingfluorideintothecatalystbeforetheintroduceofmolybdenumandnickelionscansignificantlyincreasetheSUrfaceareaandaverageporesize,improvethedispersionofmetallicnickelontheSUrfaceofcatalyst.andweakentheinteractionb
7、etweenthemetalandthesupport.ThisefectivelyincreasesthesulfidationdegreeofMo,MoS2slabstacking,andthecontentofthehighlyactiveNi.Mo.S(11)phase,whichcanpromotethehydrogenationofthearomaticringandthehydrOgenOIysisoftheC—Sbond,andthusincreasethehydrodesulfurizationactivityfor4,
8、6.DMDBT.KeyWords:Completeliquid-phasetechnology;Fluoride;4,6-DMDBT;SlurrybedReceived:March18,201
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