Methyl ten-butyl ether （MTBE）, a gasoline additive, possesses serious problems to the environmental health. In the present study, a bacterial culture named A-3 which could effectively degrade MTBE was isolated from ...Methyl ten-butyl ether （MTBE）, a gasoline additive, possesses serious problems to the environmental health. In the present study, a bacterial culture named A-3 which could effectively degrade MTBE was isolated from the MTBE contaminated soil. The isolate was identified as Chryseobacterium sp., a new species capable of degrading MTBE. In order to enhance its degradation ability, selected environment factors were investigated. The results showed that the optimal temperature was in the range of 25-30℃, the pH was 7.0, the inoculum size was 2 × 10^8 CFU/ml and the optimal concentration of MTBE was from 50 to 100 mg/L. The maximum MTBE utilization rate （Vmax） was 102 nmol MTBE/（mg cell protein.h）. Furthermore, it was found that the isolate could also degrade tert-butyl alcohol （TBA）. The degradation rates of TBA were much faster than those of MTBE. The additional TBA would lead to the decrease of the initial MTBE degradation rate and the inhibitory effect of TBA increased with the increase of TBA concentration. Similar protein profiles at least seven peptides were demonstrated after SDS-PAGE analysis of crude extracts obtained from the cells growing in MTBE and TBA culture.展开更多
The effect of HF treatment on etherification activities of ZSM-5 zeolite was investigated.Appearance,crystal structure,pore structure,acid quality of treated zeolite was charactered.It was found that catalyst treated ...The effect of HF treatment on etherification activities of ZSM-5 zeolite was investigated.Appearance,crystal structure,pore structure,acid quality of treated zeolite was charactered.It was found that catalyst treated by HF remained typical MFI structure,but grain broken;pore volume and average pore diameter of treated zeolite increased obviously;Brnsted acid quantity decreased;etherification activities of fluorinate treatment of ZSM-5 zeolite increased obviously.展开更多
A kind of Keggin structural 12-WP acid was prepared and used as catalyst to synthesize methyl tert-butyl ether(MTBE) from methanol and tert-butanol.The influences of the amount of 12-WP acid,the ratio of reactants and...A kind of Keggin structural 12-WP acid was prepared and used as catalyst to synthesize methyl tert-butyl ether(MTBE) from methanol and tert-butanol.The influences of the amount of 12-WP acid,the ratio of reactants and reaction temperature on the yield of MTBE were investigated.The results showed that the conversion of tert-butanol,selectivity of MTBE and the yield of MTBE could be up to 59.6%,74.5% and 44.4%,respectively when the amount of 12-WP acid was 2.16% of tert-butanol and the mole ratio of tert-butanol to methanol was 1:1.2 at 100 ℃.展开更多
基金Project supported by the National Natural Science Foundation of China(No.20276048)the Municipal Natural Science Foundation of Tianjin(No.06YFJMJC06800).
文摘Methyl ten-butyl ether （MTBE）, a gasoline additive, possesses serious problems to the environmental health. In the present study, a bacterial culture named A-3 which could effectively degrade MTBE was isolated from the MTBE contaminated soil. The isolate was identified as Chryseobacterium sp., a new species capable of degrading MTBE. In order to enhance its degradation ability, selected environment factors were investigated. The results showed that the optimal temperature was in the range of 25-30℃, the pH was 7.0, the inoculum size was 2 × 10^8 CFU/ml and the optimal concentration of MTBE was from 50 to 100 mg/L. The maximum MTBE utilization rate （Vmax） was 102 nmol MTBE/（mg cell protein.h）. Furthermore, it was found that the isolate could also degrade tert-butyl alcohol （TBA）. The degradation rates of TBA were much faster than those of MTBE. The additional TBA would lead to the decrease of the initial MTBE degradation rate and the inhibitory effect of TBA increased with the increase of TBA concentration. Similar protein profiles at least seven peptides were demonstrated after SDS-PAGE analysis of crude extracts obtained from the cells growing in MTBE and TBA culture.
文摘The effect of HF treatment on etherification activities of ZSM-5 zeolite was investigated.Appearance,crystal structure,pore structure,acid quality of treated zeolite was charactered.It was found that catalyst treated by HF remained typical MFI structure,but grain broken;pore volume and average pore diameter of treated zeolite increased obviously;Brnsted acid quantity decreased;etherification activities of fluorinate treatment of ZSM-5 zeolite increased obviously.
文摘A kind of Keggin structural 12-WP acid was prepared and used as catalyst to synthesize methyl tert-butyl ether(MTBE) from methanol and tert-butanol.The influences of the amount of 12-WP acid,the ratio of reactants and reaction temperature on the yield of MTBE were investigated.The results showed that the conversion of tert-butanol,selectivity of MTBE and the yield of MTBE could be up to 59.6%,74.5% and 44.4%,respectively when the amount of 12-WP acid was 2.16% of tert-butanol and the mole ratio of tert-butanol to methanol was 1:1.2 at 100 ℃.
