共查询到17条相似文献,搜索用时 62 毫秒
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对异丁烷脱氢催化剂YBD-101和国外某催化剂L进行性能比较。采用XRD和BET研究催化剂的物相结构和比表面积,固定床反应器考察两种催化剂的异丁烷脱氢催化活性和产物选择性。结果表明,催化剂YBD-101较催化剂L具有Cr2O3颗粒细小和比表面积大等特点。在反应温度(500~620)℃和空速(1.0~2.0)h-1条件下,催化剂YBD-101的异丁烷转化率高于催化剂L8个百分点,产物选择性高于催化剂L 3个百分点。催化剂YBD-101的活性稳定性优于催化剂L,再生周期明显延长,具有较好的经济效益和社会效益。 相似文献
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Au-Pt-Sn异丁烷脱氢催化剂的制备 总被引:1,自引:0,他引:1
以异丁烷为原料制取异丁烯是解决异丁烯稀缺和异丁烷浪费的双赢方法,异丁烷脱氢主要问题是催化剂的研发。国内外大量研究以Pt-Sn为活性组分,但仍然存在转化率偏低和容易失活等问题,而负载型纳米Au催化剂在低温时对CO氧化表现出很高的催化活性。在原有Pt-Sn催化剂基础上,加入Au,采用等体积浸渍法制备Au-Pt-Sn催化剂,比较Au对异丁烷脱氢催化剂转化率和选择性的影响,使用小型固定床不锈钢反应器,常压、温度600 ℃、空速2 400 h-1和临氢条件下评价其性能。发现加入一定量Au后,增强了催化剂活性,n(Au)∶n(Pt)=1.0时,异丁烯收率大于40%。考察催化剂再生前后效果差异,发现经过再生后,异丁烷转化率和选择性略低有下降,表明催化剂可以再生利用。 相似文献
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异丁烷催化脱氢制异丁烯技术研究 总被引:6,自引:0,他引:6
介绍我国异丁烷和异丁烯资源的利用现状,重点对异丁烷脱氢制备异丁烯的反应机理、反应流程和催化剂类型进行了论述。最后,通过对我国异丁烷脱氢制异丁烯催化剂开发现状的总结,指出我国应大力合理开发利用丰富的异丁烷资源。 相似文献
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The catalytic effect of metal pyrophosphates (i.e., Mn2P2O7, Ni2P2O7, CeP2O7, Mg2P2O7, ZrP2O7, Ba2P2O7, V4(P2O7)3 and Cr4(P2O7)3) on the oxidative dehydrogenation of isobutane to isobutene in the reaction temperature range of 400–600 °C has been investigated.
CeP2O7 gives the highest isobutene yield and selectivity (71%), however, V4(P2O7)3 is the most active catalyst with an isobutane conversion of 33.5% at 500 °C. Increasing the reaction temperature results
in higher isobutane conversions and lower isobutene selectivity. Reaction by-products are propylene, CO, CO2 and traces of methane and ethylene. No oxygenate products are formed under the used reaction conditions. The sum of selectivities
of CO, CO2 and methane is approximately equal to that of propylene, indicating their formation from total oxidation of C1 species accompanying the isobutane crack reactions. Working at temperatures higher than 550 °C, the homogeneous gas phase
reactions become significant and the oxygen conversion reaches 100%.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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采用固定床法考察了原料异丁烷中乙硫醇、甲醇、正丁烷和1-丁烯等杂质对Pt-Sn-K/Al2O3催化剂上异丁烷脱氢制异丁烯反应性能影响,反应产物使用气相色谱进行分析.实验结果表明,在异丁烷脱氢制异丁烯正常反应条件下,即温度580℃、压力0.1MPa、进料组成H2/i-C4H10(体积比)= 2、总空速GHSV = 2000h-1、GHSV(i-C4H10)= 667h-1,乙硫醇、甲醇、正丁烷和1-丁烯对Pt-Sn-K/Al2O3催化剂的异丁烷转化率和异丁烯选择性均有较大的影响,且杂质含量越高,对催化剂的转化率和选择性影响越大.并对杂质造成催化剂失活的原因进行了分析. 相似文献
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The activity of the vanadium magnesium binary oxides supported on Cact, SiO2, γ-Al2O3 and ZnO in the dehydrogenation of isobutane to isobutene under the carbon dioxide or inert gas atmosphere was investigated.
The highest isobutene yield (34.8%) was obtained over active carbon supported catalyst. The role of carbon dioxide in the
dehydrogenation process was determined on the basis of additional tests: the RWGS reaction, gasification of coke and regeneration
of partially reduced catalysts. The temperature-programmed techniques (TPR-H2, TPD-NH3 and TPD-CO2) were used to characterize the catalysts. 相似文献