http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Influence of toluene–tetramethylbenzene transalkylation on heavy aromatics conversion to xylenes
Sulaiman S. Al-Khattaf,Syed A. Ali,Mogahid S. Osman,Abdullah M. Aitani 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
Transalkylation of toluene–tetramethylbenzene (TeMB) over MOR and BEA was investigated at 250–400 8C. Conversion of TeMB was higher than trimethylbenzene (TMB) and toluene. Xylene yield was inthe following order: ½toluene TMB TeMB >½toluene TeMB >½toluene TMB ½toluene . Kineticmodeling for reaction network consisting of toluene–TeMB transalkylation; toluene disproportionation;and toluene–TMB transalkylation was carried out. Toluene–TeMB transalkylation rate was >50% higherthan the toluene–TMB transalkylation while the toluene disproportionation was an order of magnitudeslower than transalkylation reactions. An addition of 5–10 wt.% TeMBs to the heavy reformate causedminor impact on the xylene yield but an improvement in xylene selectivity.
Metathesis of 2-pentene over Mo and W supported mesoporous molecular sieves MCM-41 and SBA-15
Mohamed Ali Ibrahim,Muhammad Naseem Akhtar,Ji rí Cejka,Erica Montanari,Hynek Balcar,Martin Kubu,Sulaiman S. Al-Khattaf 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.53 No.-
Molybdenum and tungsten oxides were supported on silica, MCM-22, MCM-41 and SBA-15. XRD and N2 adsorption–desorption revealed that architecture and textural character of supports were preserved. The catalysts were investigated in transformation of 2-pentene at different reaction temperatures. MoO3/ MCM-22 exhibited highest conversions with isomerization and cracking as major reactions. MoO2(acac)2, MoO3 and WO3 supported on MCM-41 and SBA-15 showed metathesis reaction of 2-C5 = producing propylene, C4 = and C6+ =as major products. Catalysts based on MCM-41 exhibited higher activity and stability than SBA-15. Addition of ethylene to 2-C5 = increased selectivity to propylene due to metathesis of ethylene with 2-pentene.