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by: Dr. Judson Powlowski


Dr. Judson Powlowski
GPA 3.75


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Class Notes
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This 24 page Class Notes was uploaded by Dr. Judson Powlowski on Friday October 23, 2015. The Class Notes belongs to AT 700 at University of Kentucky taught by Staff in Fall. Since its upload, it has received 16 views. For similar materials see /class/228176/at-700-university-of-kentucky in Athletic Training at University of Kentucky.

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Date Created: 10/23/15
Hydrogen Production by Dehydrogenation of Cyclohexane and nHexane Yuguo Wang Naresh Shah Frank E Huggins G P Hu man University of Kentucky Consortium for Fossil Fuel Science Annual Meeting ug 3 Presentation Outline Catalysts Employed Experimental Setup Results and TEM Observations Conclusions Future work ideas Catalysts Employed 1 39 Prepared by impre nation 05M45FeAl203 MNi Mo Pd an 1M4FeAI203 MPt 1l5tCNT CNT carbon nanotubes 39 Catalysts were reduced in situ in flowing hydrogen 50mLmin for 2 h at 700 C 39 XAFS and Mossbauer studies showed presence of metallic alloy phases in active catalysts for CH4 CZH6 a 39 Catalyst bed was flushed with nitrogen to remove any physisorbed hydrogen in the reactor Experimental SetUp Pressure MFG Syringe pump forliquid injection Sxone furnace with quanx reactor I llecmucxv Dehydrogenation of cyclohexane Cyclohexane 1 mole Catalysts Benzene 1 mole Hydrogen 3 moles I K Kcmuckv Dehydrogenation of cyclohexane with 1PtAI203 time on stream at 315 C 100 90 80 707mm i an o H2 g 50 benzene E 40 cydohegtltane Time on sh39eam minute UK K39skuch Dehydrogenationiof cyclohexane with 05Ni 45FeAI203 400 90 ED CH4 7D CZHB f 60 03 E 50 benzene gt AD cydohexane 3 H2 40 n 345 335 355 375 395 445 435 455 475 Temperature CC I K x39mucxv 3 Dehydrogenation of cyclohexane with 05Mo 45FeAI203 CH4 CZH6 a 1 CSHB E 3 40 7 benzene gt 30 cyclohexane 20 7 10 7 OI 315 365 415 465 515 565 Temperature I K x39mucxv Carbon Nanotubes grown over 05Ni 45 FeAIZO3 at 475 00 from cyclohexane umuznsm u Aux KENTUCKY 7 Dehydrogenation of cyclohexane with 05Pd 45FeAI203 time on stream at 275 C 100 90 2 8 CH4 70 CZHG w 60 g 50 C3H8 E 40 o benzene gt 30 cyclohexane 20 10 0 0 50 100 150 200 250 300 350 Time an dream minute 6 UK a em zw Dehydrogenation of cyclohexane with 05Pd 45FeAI203 time on stream at 300 C 100 i 90 i 80 i 70 7 H2 f 60 7 CH4 E 50 czHe g 40 C3H8 30 benzene 20 7 cyclohexane 101 0 u WWIi 20 70 120 170 220 270 320 Time on stream min UK EN v39 39 E k V 7 Dehydrogenation of cyclohexane with 05Pd 45FeAI203 time on stream at 315 C 100 o H2 90 CH4 Bo CZH6 70 I CSHB 60 l benzene g 50 I c clohexane 30 20 10 0 20 70 120 170 220 270 320 Time on stream I K x39mucxv Dehydrogenation of cyclohexane with 1Pd 4FeAI203 time on stream at 315 C 100 7 90 o H2 30 cyclohexane 70 4 o benzene so 7 CH4 Volume Vn a o 20 70 120 170 220 270 320 Time on siream minute I K x39mucxv Dehydrogenation of cyclohexane with 1Pt 4FeAI203 time on stream at 315 C o H2 CH4 40 7 q benzene Volume a o 30 7 cyclohexane Time on stream minute I K x39mucxv 3 Dehydrogenation of cyclohexane with 1Pt on stackedcone CNTtime on stream at 315 C 100 90 80 707mm i an o H2 g 50 benzene E 40 cydohegtltane Time on sh39eam minute i uxra em zw Comparison of hydrogen production by different catalysts Volumequotn wazazmmoaoaxlxlao momomomomo 30 UK o 0EPd45Fe 1Pd4Fe o 1Pl4Fe 1Plcommercial 1PlCNT 100 Time on stream minute 150 K39ENIUCKV Comparison of miethane produciion by different catalysts 04 05Pd4 5Fa 1 nPd4 nFa 035 1 nPt4 nFe 03 1Ptcommema s0 25 S 02 go 15 20 70 120 170 220 270 320 Time on 51mm minute 46239 UK Kcmuckv Comparison of b nzene selectivity for different catalysts i o 0SPd45Fe 995 1 nPd4Fe 994 1PMFe g 992 1Ptcommercial 99 1PNCNT 988 93 s r i Time on stream minute 4quot quotK W UCKV 439 C a I I i Jquot 0 I 39l r a 1 I I 1 Pt4 trace amounts of carbon on the AIZO3 support Fe 05Pd45 Fe HRTEM of used catalysts cyclohexane at 315 C EDX shows no carbon on both alloy catalysts HRTEM of used catalysts 1PtICNT cyclohexane at 315 C by r m Dehydrogenatioin of nhexane with 1Pt 4FeIAIZO3 Volume JV 0 UK K39ENIUCKV Temperature 5 CH4 C2H6 cs c4 c5 cs o e ns nrhexane benzene cycohex ane 2 Dehydrogenatioin of nhexane with 1Pd 4FeIAIZO3 Volume Temperature 3 46 UK x39mucxv Summary and Conclusions I 05M45FdAl203 MNi Mo Pd catalysts have been tested for the conversion of cyclohexane to hydrogen and benzene The NiFe and MoFe catal ts exhibited re ative low activity below 40 C and produce signi cant amounts o me ane and carbon nanotubes a higher temperatures The PdFe exhibited fairly good activity at 315 quotC PdFe and PtFe cata ysts 1Pd4Fe and 1Pt4FelAl203 completely converte cyclohexane to hydrogen and benzene at 315 C Althogh this activi is as good as that of a commercial 1PtIAl203 c alyst binary hese FeM alloys do not look veg romisiarllg for dehydrogenation of cyclohexane or other 3911 ydroc ons I The best activity for cyclohexane dehydro enation was exhibited b a 1Ptlstackedcone CNT catal st whic was prepared using s ackedcone CNT39s produced by ehydrogenation of e hane I Future work will explore the use of other metals and alloys supported on stackedcone CNT s I K xcmucxv Future lans I Catalysts Pt and Pd and additional metals and alloys supported on carbon stackedcone nanofibers I Sources cyclohexane decalin methyl cyclohexane methyldecalin FishcerTropsch liquids Reactions I Cyclohexane a Benzene hydrogen I Methylcyclohexane a Toluene hydrogen I Etc I FT liquid alkanes a FT liquid alkanes alkenes hydrogen


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