The influence of steam on catalytic performance for the oxidative coupling of methane(OCM) over Ba 2+ promoted La 2 O 3 catalysts was studied. It was shown that the presence of a suitable amount of stea...The influence of steam on catalytic performance for the oxidative coupling of methane(OCM) over Ba 2+ promoted La 2 O 3 catalysts was studied. It was shown that the presence of a suitable amount of steam led to a significant increase of the yield and selectivity to C 2 hydrocarbons, a decrease of selectivity to carbon monoxide and some increase of selectivity to carbon dioxide with increasing the amount of water in the feed was also observed. The activity and selectivity of the catalysts are more sensitive to the effect of steam with the variation of Ba 2+ content in the catalysts at a relatively low temperature(650℃). The comparative experiments for OCM with methane oxygen mixture diluted with nitrogen or steam were carried out in order to investigate the role of steam.展开更多
基于系统功能语言学中的及物性系统理论,以UAM Corpus Tool、SPSS为研究工具,用定性与定量相结合的方法,将微观语言分析与宏观话语建构相结合,从过程、参与者、环境三个路径探究“村BA”海外报道塑造的贵州形象。研究发现,外媒对贵州态...基于系统功能语言学中的及物性系统理论,以UAM Corpus Tool、SPSS为研究工具,用定性与定量相结合的方法,将微观语言分析与宏观话语建构相结合,从过程、参与者、环境三个路径探究“村BA”海外报道塑造的贵州形象。研究发现,外媒对贵州态度总体上是积极正向的;“村BA”海外新闻报道中塑造了热爱体育、开放包容、蓬勃发展的贵州形象。从语言学视角分析贵州形象“他塑”,拓宽了贵州形象研究内容,可以为贵州形象“他塑”的研究提供一定借鉴。展开更多
文摘The influence of steam on catalytic performance for the oxidative coupling of methane(OCM) over Ba 2+ promoted La 2 O 3 catalysts was studied. It was shown that the presence of a suitable amount of steam led to a significant increase of the yield and selectivity to C 2 hydrocarbons, a decrease of selectivity to carbon monoxide and some increase of selectivity to carbon dioxide with increasing the amount of water in the feed was also observed. The activity and selectivity of the catalysts are more sensitive to the effect of steam with the variation of Ba 2+ content in the catalysts at a relatively low temperature(650℃). The comparative experiments for OCM with methane oxygen mixture diluted with nitrogen or steam were carried out in order to investigate the role of steam.
文摘基于系统功能语言学中的及物性系统理论,以UAM Corpus Tool、SPSS为研究工具,用定性与定量相结合的方法,将微观语言分析与宏观话语建构相结合,从过程、参与者、环境三个路径探究“村BA”海外报道塑造的贵州形象。研究发现,外媒对贵州态度总体上是积极正向的;“村BA”海外新闻报道中塑造了热爱体育、开放包容、蓬勃发展的贵州形象。从语言学视角分析贵州形象“他塑”,拓宽了贵州形象研究内容,可以为贵州形象“他塑”的研究提供一定借鉴。
