Preparation and Characterization Study Of Petrochemical Nanocatalysts via Physical and Chemical Modification
Mona Ali Ahmed Naghmash;
Abstract
The thesis contains five parts, each concerned with a conversion of methanol to dimethyl ether on zeolite cataltst.
Part I: In this part, four different zeolite were used to investigate there activity on DME formation (H-ZSM-5, H-MOR, H-BETA and H-Y), its found that H-ZSM-5 zeolite catalyst has higher catalytic activity than the other three zeolite catalyst. This order is compatible with the order of acidity of this zeolite that H-ZSM-5 has stronger acidity than the other zeolites.
Part II: In this part we studied the effect of Si/Al ratio on H-ZSM-5 and H-MOR zeolite catalyst for conversion of methanol to DME, we studied five samples of H-ZSM-5 zeolite possessing five different Si/Al ratios (25, 90, 120, 240 and 400) and three samples of H-MOR zeolite (6.1, 40, 90), increase Si/Al ratio leads to decrease the catalytic activity due to decrease acidity, so HZSM-5(25) and H-MOR(6.1) have highest activity.
Part III: In this part the effect of ultrasonic irradiation were studied on zeolite catalysts:
1-Study the factors affecting ultrasonication efficiency were studied on H-MOR catalyst, effect of ultrasonic irradiation time (20, 40, 60, 80, 100 min), effect of type of solvent (methanol, ethanol, propanol , butanol and warer), effect of volume of solvent (5, 7.5, 10 and 12.5 cm3), its found that the best condition to use ultrasonic irradiation is 60 min, 7.5 cm3 methanol.
2- The best condition of ultrasonication was studied on other zeolite catalyst H-BETA, H-Y, H-ZSM-5 with different Si/Al ratio. Ultrasonic increase the catalytic activity of H-BETA and H-ZSM-5 different Si/Al ratio, but result little decrease in the catalytic activity of H-Y zeolite.
Part IV: In this part the effect of halogenation (chlorination and fluorination) and effect of ultrasonic on halogenation were studied on zeolite catalysts.
1-H-MOR: Halogenation of H-MOR either by F- or Cl- was found to promote its activity for conversion of methanol due to increasing the acidity.
H-MOR (F) > H-MOR (Cl) > H-MOR
The fluorinated H-MOR zeolite catalysts are the most active and selective catalysts for conversion of methanol to DME. Ultrasonic irradiation leads to increase the catalytic activity of
Part I: In this part, four different zeolite were used to investigate there activity on DME formation (H-ZSM-5, H-MOR, H-BETA and H-Y), its found that H-ZSM-5 zeolite catalyst has higher catalytic activity than the other three zeolite catalyst. This order is compatible with the order of acidity of this zeolite that H-ZSM-5 has stronger acidity than the other zeolites.
Part II: In this part we studied the effect of Si/Al ratio on H-ZSM-5 and H-MOR zeolite catalyst for conversion of methanol to DME, we studied five samples of H-ZSM-5 zeolite possessing five different Si/Al ratios (25, 90, 120, 240 and 400) and three samples of H-MOR zeolite (6.1, 40, 90), increase Si/Al ratio leads to decrease the catalytic activity due to decrease acidity, so HZSM-5(25) and H-MOR(6.1) have highest activity.
Part III: In this part the effect of ultrasonic irradiation were studied on zeolite catalysts:
1-Study the factors affecting ultrasonication efficiency were studied on H-MOR catalyst, effect of ultrasonic irradiation time (20, 40, 60, 80, 100 min), effect of type of solvent (methanol, ethanol, propanol , butanol and warer), effect of volume of solvent (5, 7.5, 10 and 12.5 cm3), its found that the best condition to use ultrasonic irradiation is 60 min, 7.5 cm3 methanol.
2- The best condition of ultrasonication was studied on other zeolite catalyst H-BETA, H-Y, H-ZSM-5 with different Si/Al ratio. Ultrasonic increase the catalytic activity of H-BETA and H-ZSM-5 different Si/Al ratio, but result little decrease in the catalytic activity of H-Y zeolite.
Part IV: In this part the effect of halogenation (chlorination and fluorination) and effect of ultrasonic on halogenation were studied on zeolite catalysts.
1-H-MOR: Halogenation of H-MOR either by F- or Cl- was found to promote its activity for conversion of methanol due to increasing the acidity.
H-MOR (F) > H-MOR (Cl) > H-MOR
The fluorinated H-MOR zeolite catalysts are the most active and selective catalysts for conversion of methanol to DME. Ultrasonic irradiation leads to increase the catalytic activity of
Other data
| Title | Preparation and Characterization Study Of Petrochemical Nanocatalysts via Physical and Chemical Modification | Other Titles | دراسة تحضير وخصائص الحفازات النانوية البتروكيماوية بواسطة معالجات فيزيائية وكيميائية | Authors | Mona Ali Ahmed Naghmash | Issue Date | 2014 |
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