Increasingly stringent regulations on environmental protection make gasoline desulfurization be a major concern for the present refineries. Accordingly, we proposed an original idea of sulfur reduction by catalytic cr...Increasingly stringent regulations on environmental protection make gasoline desulfurization be a major concern for the present refineries. Accordingly, we proposed an original idea of sulfur reduction by catalytic cracking of FCC gasoline and simultaneously converting most sulfur of sulfides to H 2S. Some progress has been made in exploitation of the catalysts. In this paper, the effect of temperature and catalyst/oil ratio on the FCC gasoline desulfurization over two catalyst samples via catalytic cracking was discussed. The optimum temperature range is 400～420 ℃ for sulfur removal with relatively low cracking loss of gasoline. The highest sulfur removal percentage of 70% can be achieved with a liquid yield of more than 96%. The catalyst samples have higher desulfurization activity and selectivity for the sulfide cracking. In addition, both the gasoline yield and the sulfur content of the desulfurized gasoline decrease with the catalyst/oil ratio.展开更多
As an important branch of literature, children's literature is exerting a pivotal role in social education. From the perspec-tive of reception aesthetics, English version of Cao Wenxuan's work Bronze and Sunfl...As an important branch of literature, children's literature is exerting a pivotal role in social education. From the perspec-tive of reception aesthetics, English version of Cao Wenxuan's work Bronze and Sunflower is studied from four aspects:horizon of expectation, indeterminacy, aesthetic distance and fusion of horizons. In reception aesthetics, target readers-children are the center of the reading. So translation methods are to satisfy children's demand. It has also been found out that there are some features for children's literature translation include using colloquial words, concise sentence structure and the combination of domestication and foreignization.展开更多
文摘Increasingly stringent regulations on environmental protection make gasoline desulfurization be a major concern for the present refineries. Accordingly, we proposed an original idea of sulfur reduction by catalytic cracking of FCC gasoline and simultaneously converting most sulfur of sulfides to H 2S. Some progress has been made in exploitation of the catalysts. In this paper, the effect of temperature and catalyst/oil ratio on the FCC gasoline desulfurization over two catalyst samples via catalytic cracking was discussed. The optimum temperature range is 400～420 ℃ for sulfur removal with relatively low cracking loss of gasoline. The highest sulfur removal percentage of 70% can be achieved with a liquid yield of more than 96%. The catalyst samples have higher desulfurization activity and selectivity for the sulfide cracking. In addition, both the gasoline yield and the sulfur content of the desulfurized gasoline decrease with the catalyst/oil ratio.
文摘As an important branch of literature, children's literature is exerting a pivotal role in social education. From the perspec-tive of reception aesthetics, English version of Cao Wenxuan's work Bronze and Sunflower is studied from four aspects:horizon of expectation, indeterminacy, aesthetic distance and fusion of horizons. In reception aesthetics, target readers-children are the center of the reading. So translation methods are to satisfy children's demand. It has also been found out that there are some features for children's literature translation include using colloquial words, concise sentence structure and the combination of domestication and foreignization.
