HPMo-loaded Y-zeolites were prepared for the removal of trace olefins from aromatic hydrocarbons. The temperature of calcination and the proportion of phospho-molybdic acid in the catalyst were studied. The catalytic ...HPMo-loaded Y-zeolites were prepared for the removal of trace olefins from aromatic hydrocarbons. The temperature of calcination and the proportion of phospho-molybdic acid in the catalyst were studied. The catalytic activity for olefins removal and the service life of the catalyst were tested in a fixed bed microreactor. The results showed that the catalyst containing 3% phospho-molybdic acid, which was calcined at 550℃, demonstrated the best activity for olefins removal. The catalyst could be regenerated and could perform still very well. Catalyst characterization was performed by XRD and measured by pyridine-FTIR spectrometry. The test results indicated that the activity of the catalyst was related with the effect of acid concentration and acid strength. Besides, the deactivation of the catalyst was associated with the formation of coke deposits and the deactivated catalyst could recover its activity by oxidation with air under a proper temperature.展开更多
研究发现,四氯化硅气相法制备高硅Y型沸石与稀土离子交换相结合,能使高硅Y型沸石中RE_2O_3含量达到6％～9％,在晶胞常数相近的情况下,与水热法制备USY相比,RE_2O_3含量提高近3倍,有效地提高了高硅Y型沸石的裂化活性和氢转移活性。用XBD...研究发现,四氯化硅气相法制备高硅Y型沸石与稀土离子交换相结合,能使高硅Y型沸石中RE_2O_3含量达到6％～9％,在晶胞常数相近的情况下,与水热法制备USY相比,RE_2O_3含量提高近3倍,有效地提高了高硅Y型沸石的裂化活性和氢转移活性。用XBD、FT-IB,^(27)Al MAS NMB及BET-N_2吸附方法进行表征,从反应机理和制备工艺上探讨了两种制备方法提高稀土含量的差异,提出及时清理硅铝碎片,保持孔道畅通,是有效提高高硅Y型沸石中稀土含量的关键。展开更多
The acetalization and ketalization of various aldehydes and ketones with alcohols by using dealuminated USY(ultrastable Y-type zeolite) as catalyst were studied. The influences of silica/alumina ratio in the catalyst,...The acetalization and ketalization of various aldehydes and ketones with alcohols by using dealuminated USY(ultrastable Y-type zeolite) as catalyst were studied. The influences of silica/alumina ratio in the catalyst, catalyst amount and reaction time on the reaction were investigated. It is showed that the dealuminated USY is a high active catalyst for acetalization and ketaliz ation and its high activity can be readily returned to original by heating at 500 ℃ for 5 hours.展开更多
文摘HPMo-loaded Y-zeolites were prepared for the removal of trace olefins from aromatic hydrocarbons. The temperature of calcination and the proportion of phospho-molybdic acid in the catalyst were studied. The catalytic activity for olefins removal and the service life of the catalyst were tested in a fixed bed microreactor. The results showed that the catalyst containing 3% phospho-molybdic acid, which was calcined at 550℃, demonstrated the best activity for olefins removal. The catalyst could be regenerated and could perform still very well. Catalyst characterization was performed by XRD and measured by pyridine-FTIR spectrometry. The test results indicated that the activity of the catalyst was related with the effect of acid concentration and acid strength. Besides, the deactivation of the catalyst was associated with the formation of coke deposits and the deactivated catalyst could recover its activity by oxidation with air under a proper temperature.
文摘研究发现,四氯化硅气相法制备高硅Y型沸石与稀土离子交换相结合,能使高硅Y型沸石中RE_2O_3含量达到6％～9％,在晶胞常数相近的情况下,与水热法制备USY相比,RE_2O_3含量提高近3倍,有效地提高了高硅Y型沸石的裂化活性和氢转移活性。用XBD、FT-IB,^(27)Al MAS NMB及BET-N_2吸附方法进行表征,从反应机理和制备工艺上探讨了两种制备方法提高稀土含量的差异,提出及时清理硅铝碎片,保持孔道畅通,是有效提高高硅Y型沸石中稀土含量的关键。
文摘The acetalization and ketalization of various aldehydes and ketones with alcohols by using dealuminated USY(ultrastable Y-type zeolite) as catalyst were studied. The influences of silica/alumina ratio in the catalyst, catalyst amount and reaction time on the reaction were investigated. It is showed that the dealuminated USY is a high active catalyst for acetalization and ketaliz ation and its high activity can be readily returned to original by heating at 500 ℃ for 5 hours.
