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以固体酸TiO2 ZrO2/SO2-4为催化剂时,甲苯硝化的位置选择性,对位硝基甲苯与邻位硝基甲苯之比(P/O)可达156。探索了该催化剂的最佳制备条件,取得了令人满意的结果。 相似文献
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Stian Svelle Morten Bjørgen Stein Kolboe Dietmar Kuck Matthias Letzel Unni Olsbye Osamu Sekiguchi Einar Uggerud 《Catalysis Letters》2006,109(1-2):25-35
In order to reach a deeper insight into the reaction mechanism of the zeolite catalyzed methanol to hydrocarbons reaction
(MTH), the proposed reaction intermediates, i.e., a series of multiply methyl-substituted benzenium ions has been generated
in the gas phase by chemical ionization. The fragmentations of the corresponding long-lived (metastable) ions have been investigated.
While expulsion of H2 dominates for the lower homologues, elimination of methane dominates for the higher homologues, accompanied by increasing
amounts CH3·. Loss of larger fragments relevant to the MTH-reaction, in particular ethene, propene and even butene, is also observed in
minor amounts. This latter finding is consistent with a proposed reaction cycle in the MTH reaction known as the paring mechanism, and the feasibility of this mechanism has thus been demonstrated. The metastable gas-phase ions studied here are considerably
more energetic than those residing in a zeolite catalyst, but they were found to decompose with markedly higher selectivity
towards alkenes as compared to those activated by collision-induced dissociation (CID). 相似文献
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粘胶基活性炭纤维对甲苯的吸附及再生 总被引:3,自引:0,他引:3
在自制的实验装置上,研究了粘胶基活性炭纤维(ACF)对甲苯气体的吸附及其吸附饱和后采用高温水蒸气解吸、再生。正交实验表明,甲苯气体流量、浓度和粘胶基ACF的填充高度对吸附过程都有显著的影响。最佳操作参数为:温度13.0℃、粘胶基ACF用量1.50 g、填充高度15 cm、甲苯气体流量0.8 m3/h、甲苯进口平均浓度89.7 mg/m3,脱附平均温度136.0℃时,粘胶基ACF对甲苯气体吸附再生效果较好。验证了粘胶基ACF的吸附量与气体进口浓度成正比,与气体流量成反比关系。 相似文献
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改性石油磺酸盐的合成与表征 总被引:2,自引:0,他引:2
以甲苯为初始反应物,通过付-克反应、Knoevenagel反应和磺化反应,合成了改性甲基苯磺酸钠.探索了以工业渣油为原料合成改性石油磺酸钠的方法.对合成产物进行了表征. 相似文献
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用化工流程模拟软件PROⅡ分析了侧线采出温度对循环苯塔物料组成的影响。将侧线采出温度控制在157~165℃并根据采出温度自动调节采出量,可使侧线采出物料中乙苯的质量分数由改造前的14.62%下降为0.53%,乙苯损失量由151kg/h降为4kg/h,乙苯回收量1176t/a,经济效益增加588万元/a。 相似文献
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以Y-Al-SBA-15复合分子筛、γ-Al2O3和无定形SiO2-Al2O3为原料制备催化剂载体,采用等体积浸渍法制备W-Ni/Y-Al-SBA-15-SiO2-Al2O3催化剂,采用N2吸附、NH3-TPD、XPS和TEM等手段对其进行表征,在微反装置上考察了催化加氢裂化的性能。实验结果表明,随Y-Al-SBA-15复合分子筛含量的增加:催化剂的孔体积和比表面积变化不大,孔径和酸量增大;造成金属组分的不均匀分布,更多的金属组分进入介孔孔道内,经焙烧后产生的W-Ni大晶粒不易被硫化,且更易造成积碳;WS2活性相的平均层数略有降低,而平均长度从4.98 nm增至6.24 nm;甲苯和正十二烷加氢裂化的转化率增大。 相似文献