ZSM-5 zeolite membrane reactor was used in ethylbenzene dehydrogenation to styrene under the circumstances of commercial production.The experimental results indicated that the conversion of ethylbenzene in the membran...ZSM-5 zeolite membrane reactor was used in ethylbenzene dehydrogenation to styrene under the circumstances of commercial production.The experimental results indicated that the conversion of ethylbenzene in the membrane reactor increased with increasing pressure of the membrane tube.Using the inert sweep gas instead of vacuumizing, the result of long term steady operation under the same condition showed that the selectivity of styrene increased and the conversion of ethylbenzene in the membrane reactor increased by 7.52% in comparison with the fixed-bed reactor.展开更多
Effects of various factors on the reaction conversion were calculated by theapplication of self-progranund software and thermodyntalc data; Activities and selectiv-ities of various ZnO/silica-based catalysts were comp...Effects of various factors on the reaction conversion were calculated by theapplication of self-progranund software and thermodyntalc data; Activities and selectiv-ities of various ZnO/silica-based catalysts were compared; Reaction mechhasm based onthermodyntalc equilibrium and products distribution of the reactions was also展开更多
对"湿-干"多相态条件下环己烷长时间连续脱氢反应进行了研究,考察了盐浴温度和环己烷进料速率对系统的产氢总量、环己烷脱氢速率和环己烷脱氢转化率的影响。结果表明,在无任何载气或吹扫气的条件下,环己烷在多相态条件下可以...对"湿-干"多相态条件下环己烷长时间连续脱氢反应进行了研究,考察了盐浴温度和环己烷进料速率对系统的产氢总量、环己烷脱氢速率和环己烷脱氢转化率的影响。结果表明,在无任何载气或吹扫气的条件下,环己烷在多相态条件下可以持续高效地进行脱氢反应,产生高纯度的氢气。在盐浴温度360℃,进料速率34 m L·h-1,催化剂用量3 g的反应条件下,脱氢系统的反应状态达到最佳,6 h的产氢总量为8.9 L,单位反应面积的平均产氢速率可达0.16mmol·min-1·cm-2。在"湿-干"多相态条件下,Raney-Ni在环己烷脱氢反应中表现出很高的催化活性,具有广泛的应用价值。对环己烷脱氢表观反应动力学的研究表明,脱氢反应的表观活化能较低,仅为12.54 k J·mol-1,多相态条件下环己烷的脱氢反应为扩散控制。展开更多
14-Noreudesma-4,11-dien-3,9-diones′ analogues were treated with DDQ in dioxane and afforded the rearranged aromatic products. The similar compounds to eudesma-4,11-dien-3,9-diones had no reaction. 9-Actoxy-14-noreude...14-Noreudesma-4,11-dien-3,9-diones′ analogues were treated with DDQ in dioxane and afforded the rearranged aromatic products. The similar compounds to eudesma-4,11-dien-3,9-diones had no reaction. 9-Actoxy-14-noreudesma-4,11-dien-3-ones, 9-actoxy-eudesma-4,11-dien-3-ones and their analogues yielded the normal 1,2-dehydro-products. The mechanism of the rearrangement was discussed.展开更多
采用密度泛函理论(DFT)的B3LYP方法对Ti_2^+活化环己烷的同面脱氢机理进行理论计算,分别得到反应中涉及到的驻点、优化构型及相关的构型参数,并简单绘制了反应势能图,从而对反应机理进行详细的分析。对环己烷与Ti_2^+反应的同面脱氢机...采用密度泛函理论(DFT)的B3LYP方法对Ti_2^+活化环己烷的同面脱氢机理进行理论计算,分别得到反应中涉及到的驻点、优化构型及相关的构型参数,并简单绘制了反应势能图,从而对反应机理进行详细的分析。对环己烷与Ti_2^+反应的同面脱氢机理进行研究,研究结果表明环己烷与Ti_2^+的同面脱氢过程中三次脱氢机理相似,反应发生在混合势能面上,最终产物是二、四重态的混合物,且放热分别为54.85、28.74 k J/mol。展开更多
文摘ZSM-5 zeolite membrane reactor was used in ethylbenzene dehydrogenation to styrene under the circumstances of commercial production.The experimental results indicated that the conversion of ethylbenzene in the membrane reactor increased with increasing pressure of the membrane tube.Using the inert sweep gas instead of vacuumizing, the result of long term steady operation under the same condition showed that the selectivity of styrene increased and the conversion of ethylbenzene in the membrane reactor increased by 7.52% in comparison with the fixed-bed reactor.
文摘Effects of various factors on the reaction conversion were calculated by theapplication of self-progranund software and thermodyntalc data; Activities and selectiv-ities of various ZnO/silica-based catalysts were compared; Reaction mechhasm based onthermodyntalc equilibrium and products distribution of the reactions was also
文摘对"湿-干"多相态条件下环己烷长时间连续脱氢反应进行了研究,考察了盐浴温度和环己烷进料速率对系统的产氢总量、环己烷脱氢速率和环己烷脱氢转化率的影响。结果表明,在无任何载气或吹扫气的条件下,环己烷在多相态条件下可以持续高效地进行脱氢反应,产生高纯度的氢气。在盐浴温度360℃,进料速率34 m L·h-1,催化剂用量3 g的反应条件下,脱氢系统的反应状态达到最佳,6 h的产氢总量为8.9 L,单位反应面积的平均产氢速率可达0.16mmol·min-1·cm-2。在"湿-干"多相态条件下,Raney-Ni在环己烷脱氢反应中表现出很高的催化活性,具有广泛的应用价值。对环己烷脱氢表观反应动力学的研究表明,脱氢反应的表观活化能较低,仅为12.54 k J·mol-1,多相态条件下环己烷的脱氢反应为扩散控制。
文摘14-Noreudesma-4,11-dien-3,9-diones′ analogues were treated with DDQ in dioxane and afforded the rearranged aromatic products. The similar compounds to eudesma-4,11-dien-3,9-diones had no reaction. 9-Actoxy-14-noreudesma-4,11-dien-3-ones, 9-actoxy-eudesma-4,11-dien-3-ones and their analogues yielded the normal 1,2-dehydro-products. The mechanism of the rearrangement was discussed.
文摘采用密度泛函理论(DFT)的B3LYP方法对Ti_2^+活化环己烷的同面脱氢机理进行理论计算,分别得到反应中涉及到的驻点、优化构型及相关的构型参数,并简单绘制了反应势能图,从而对反应机理进行详细的分析。对环己烷与Ti_2^+反应的同面脱氢机理进行研究,研究结果表明环己烷与Ti_2^+的同面脱氢过程中三次脱氢机理相似,反应发生在混合势能面上,最终产物是二、四重态的混合物,且放热分别为54.85、28.74 k J/mol。
