Silver modified HZSM-5 （AgHZ） zeolite catalysts were prepared by ion exchange method and their catalytic properties in the l-butene cracking reaction were measured. The catalysts were characterized by infrared spec-...Silver modified HZSM-5 （AgHZ） zeolite catalysts were prepared by ion exchange method and their catalytic properties in the l-butene cracking reaction were measured. The catalysts were characterized by infrared spec- troscopy with pyridine adsorption （Py-IR）, N2 adsorption and X-ray diffraction （XRD）. The effects of Ag loading and steaming treatment on catalytic performances were studied. It is found that the activity ofHT_SM-5 （HZ） catalyst significantly decreases with the steaming time, whereas AgHZ catalysts show stable activity in the steaming time of 24-48 h and their activities increase with the Ag loading. When the steaming time is 24-48 h, the yield of propylene over HZ catalyst significantly decreases, whereas it is stable over AgHZ catalysts. The AgHZ catalysts with Ag loadings of 0.28%-0.43% （by mass） show similar propylene yields （-30%）, which are higher than that over the AgHZ catalyst with a Ag loading of 0.55% （by mass）. These results indicate that the steam-treated AgHZ catalysts with optimum Ag loadings have higher yield of propylene and are more stable than the steam- treated HZ catalyst. The regeneration stability measurement in butene cracking also shows that the AgHZ catalyst steam-treated under a suitable condition has better stability than the HZ catalyst.展开更多
In order to effectively reduce the viscosity of heavy oil during steam injection, a catalyst system, consisting of reservoir minerals, nickel sulfate, and formic acid, was used to exert catalytic effect on aquathermol...In order to effectively reduce the viscosity of heavy oil during steam injection, a catalyst system, consisting of reservoir minerals, nickel sulfate, and formic acid, was used to exert catalytic effect on aquathermolysis of heavy crude oil extracted from the Liaohe oilfield. Experimental results indicated that all the reservoir minerals used in the experiment had catalytic effect on aquathermolysis and the oil viscosity reduction rate ranged from 24% to 36% after the aquathermolysis reaction. If nickel sulfate was used as the catalyst and added to the reaction system, the oil viscosity reduction rate could reach 50%. If formic acid was used as the hydrogen donor, the oil viscosity reduction rate could increase further, and could reach up to 71.8%. The aquathermolysis reaction of heavy oil under steam injection condition was affected by the reaction temperature, the reaction time, the dosage of minerals, the catalyst concentration, and the hydrogen donor. The experimental results showed that minerals, catalyst and hydrogen donor could work together to enhance aquathermolysis reaction of heavy oil in the presence of the high-temperature water vapor.展开更多
基金Supported by the National Science Foundation of China(U1162129)the Science and Technology Department of Zhejiang Province(2009R50020)
文摘Silver modified HZSM-5 （AgHZ） zeolite catalysts were prepared by ion exchange method and their catalytic properties in the l-butene cracking reaction were measured. The catalysts were characterized by infrared spec- troscopy with pyridine adsorption （Py-IR）, N2 adsorption and X-ray diffraction （XRD）. The effects of Ag loading and steaming treatment on catalytic performances were studied. It is found that the activity ofHT_SM-5 （HZ） catalyst significantly decreases with the steaming time, whereas AgHZ catalysts show stable activity in the steaming time of 24-48 h and their activities increase with the Ag loading. When the steaming time is 24-48 h, the yield of propylene over HZ catalyst significantly decreases, whereas it is stable over AgHZ catalysts. The AgHZ catalysts with Ag loadings of 0.28%-0.43% （by mass） show similar propylene yields （-30%）, which are higher than that over the AgHZ catalyst with a Ag loading of 0.55% （by mass）. These results indicate that the steam-treated AgHZ catalysts with optimum Ag loadings have higher yield of propylene and are more stable than the steam- treated HZ catalyst. The regeneration stability measurement in butene cracking also shows that the AgHZ catalyst steam-treated under a suitable condition has better stability than the HZ catalyst.
基金the financial supports from National Key Project of Scientific and Technical Supporting Programs:Enhancing oil displacement efficiency during steamfloods(fund No.2008ZX05012-001)
文摘In order to effectively reduce the viscosity of heavy oil during steam injection, a catalyst system, consisting of reservoir minerals, nickel sulfate, and formic acid, was used to exert catalytic effect on aquathermolysis of heavy crude oil extracted from the Liaohe oilfield. Experimental results indicated that all the reservoir minerals used in the experiment had catalytic effect on aquathermolysis and the oil viscosity reduction rate ranged from 24% to 36% after the aquathermolysis reaction. If nickel sulfate was used as the catalyst and added to the reaction system, the oil viscosity reduction rate could reach 50%. If formic acid was used as the hydrogen donor, the oil viscosity reduction rate could increase further, and could reach up to 71.8%. The aquathermolysis reaction of heavy oil under steam injection condition was affected by the reaction temperature, the reaction time, the dosage of minerals, the catalyst concentration, and the hydrogen donor. The experimental results showed that minerals, catalyst and hydrogen donor could work together to enhance aquathermolysis reaction of heavy oil in the presence of the high-temperature water vapor.
