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H.-J. Jing F.-K. Yang Y.-M. Xia J.-Q. Feng J.-L. Liu Q.-Y. Zong 《Petroleum Science and Technology》2013,31(16):1737-1746
Abstract The present study describes the performance of the HZSM-5 zeolite catalyst modified by Cu, Zn, Ga, La, P, Ag, and other ions for the conversion of methanol to aromatics in a fixed-bed reactor, and the influences of the system pressure and temperature on methanol aromatization are in discussion. The results show that the optimum single ion for the modification of catalyst was Zn or Cu. The optimum combined ions were Zn and Ga. The yield of aromatics could reach up to 66.6% on the catalyst modified with Ga2% and Zn10%. 相似文献
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液化石油气在ZnNi/HZSM-5催化剂上的芳构化 总被引:7,自引:0,他引:7
用浸渍法制备ZnNi/HZSM -5催化剂 ,通过对液化石油气的芳构化试验表明 ,其活性明显高于HZSM -5催化剂。在常压、温度 540℃、质量空速 1h- 1条件下 ,芳烃和苯 -甲苯 -二甲苯 (BTX)混合物收率分别达到 4 8%和4 5%左右 ,液态产品中芳烃质量分数高达 98%。同时还考察再生活化温度、再生活化时间和反应温度对芳构化催化作用的影响。结果表明 ,再生活化温度对催化剂的恢复影响比较大 ,只有达到 575℃ ,活化时间至少 2h ,催化剂活性才能完全恢复 ;低温段 ( 550℃ )再生活化时 ,再生活化时间将影响催化剂活性 ;反应温度在 50 0~ 550℃时 ,随着反应温度增加 ,液体收率和芳烃收率随之增加 ,对芳烃选择性影响不大 ,BTX收率幅度波动较大。用金属改性的ZnNi/HZSM -5催化剂具有较强的芳构化能力。 相似文献
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L. Zhao J. Zhu H. Y. Wang M. Wei J. Ma Y. Z. Bai 《Petroleum Science and Technology》2013,31(5):577-584
Abstract Zinc and phosphorus incorporated HZSM-5 catalyst was prepared by adopting incipient wet co-impregnation (Zn-P/HZSM-5). Zn-P/HZSM-5 catalyst exhibited the lowest acidity but the highest aromatization activity with stable performance in the studied period of 16 hr. The process conditions on aromatization reaction and the coke deactivation mechanism of Zn-P/HZSM-5 catalyst were studied on a small-scale, fixed bed reactor using FCC naphtha (75–120°C). The weight contents of ZnO and P2O5 were 2% and 4%, respectively. Results showed that Zn-P/HZSM-5 catalyst under a temperature of 450°C, liquid hourly space velocity of 1.0 h?1, and pressure of 0.1 MPa, the conversions of olefins and alkanes are 96.77% and 88.94%, respectively, the contents of olefins, aromatics in liquid product are 6.79% and 74.57%, respectively. Carbon deposition was the major reason for catalyst deactivation due to the catalyst's good performance as a fresh catalyst after regeneration. All of the blending products fitted the standards of Chinese gasoline. 相似文献
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Abstract The aromatization reaction performance of P-Zn/HZSM-5 catalyst was investigated on a fixed bed reactor using five fluid catalytic cracked (FCC) gasoline fractions (<100°C, 50°C–100°C, <120°C, 75°C–120°C, and full fraction) as feedstock, and the effect of feedstock on aromatization is discussed. The results showed that the activity and stability of P-Zn/HZSM-5 catalyst for the aromatization of the 50°C–100°C fraction were high in definite reaction conditions. After 16 hr, the content of olefin and aromatics in liquid product were 5.23 and 79.9%, respectively. The liquid product of low olefin and high aromatics was obtained. The distribution of benzene, toluene, and xylene in liquid product of 50°C–100°C fraction was investigated during aromatization, and the result showed that the toluene content was maximum among the three aromatics contents, the benzene content was minimum at the beginning of the reaction, xylene content became maximum, and benzene was still minimum after reacting for 20 hr. The content of C9 + aromatics increased at the first stage of the reaction and then decreased with the increasing reaction time. 相似文献
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以50~100℃的FCC汽油馏分为原料,在连续固定床反应器上考察了工艺条件对P-Zn/HZSM-5催化剂在芳构化反应中性能的影响。结果表明,在反应温度410℃、反应压力0.5MPa、液时空速1.0h^-1的操作条件下,液相产物中的烯烃、异构烷烃和芳烃的含量分别为8.56%,13.07%,73.39%。催化剂P-Zn/HZSM-5具有较好的芳构化降烯烃效果。 相似文献
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报道了在Zn、Ga改性的ZSM-5分子筛上进行乙烷芳构化与乙烯芳构化反应的结果,并考察了反应温度对Zn-ZSM-5催化剂乙烷芳构化性能的影响和催化剂Ga-ZSM-5的焙烧时间对其性能的影响等。试验结果表明:(1)乙烷脱氢活化步骤是乙烷芳构化反应的控制步骤,Zn、Ga物种对乙烷脱氢活化起着至关重要的作用,并且zn物种的作用大于Ga物种。Zn、Ga物种还能促进聚合环化物脱氢向芳烃转化:(2)升高反应温度对乙烷脱氢活化和聚合环化物脱氢有利,同时会使聚合环化物的裂解反应速度增加,因而在乙烷芳构化反应中存在最佳温度;(3)延长焙烧时间,有利于乙烷的活化及乙烯、C_3等芳构化中间产物向芳烃的转化。 相似文献
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WangYongjun XieChaogang 《中国炼油与石油化工》2004,(2):41-47
The performance of ZRP zeolite catalysts for aromatization of C6 aliphatic hydrocarbons was investigated in a pulsed microreactor. The influence of metal modified ZRP zeolites on aromatization reaction was also studied, coupled with comparison of aromatization tendencies of olefins, paraffins and paraffins with different degrees of chain branching. Test results had shown that the lower the silicon/aluminum ratio in the ZRP zeolite, the higher the aromatization reactivity of aliphatic hydrocarbons. Modification of ZRP zeolite by zinc and its zinc content had apparent impact on the yield and distribution of aromatics. The aromatization tendency of olefins was apparently better than paraffins, while the aromatization tendency of monomethyl paraffins was better than that of straight-chain paraffins with the exception of dimethyl paraffins, which had worse aromatization tendency because of their steric hindrance. 相似文献
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LiuYue GuoQi 《中国炼油与石油化工》2004,(2):7-13
Technical progress in the field of conversion of methanol into ethylene and propylene over the ZSM-5 catalyst was summarized. The economical analysis of the technology, the mechanism of chemical reaction and reaction kinetics were introduced. The factors including the effect of the operating conditions,the influence of catalyst preparation conditions and modification of ZSM-5 zeolite on the reaction and coke formation were also discussed. 相似文献
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以纳米ZSM-5为硅源,采用分子筛硅源法制备了纳米ZSM-5-MCM-41介微孔复合分子筛,并对合成试样进行了XRD、NH3-TPD、SEM及Py-IR等表征,考察了晶化过程中体系pH值、晶化温度、晶化时间、模板剂用量和碱溶液浓度对ZSM-5-MCM-41复合分子筛结构及性质的影响。采用模拟原料油,在高压微反装置上评价了以复合分子筛为载体制备的Co-Mo/ZSM-5-MCM-41催化剂的催化性能。结果表明,与基于机械混合载体的催化剂相比,基于分子硅源法制备复合分子筛载体的催化剂有较高的芳构性能和脱硫性能,在压力1.5MPa、温度350℃、氢油体积比300,空速2h-1条件下,模拟原料的芳构产率和脱硫率分别为15.08%和95.48%。 相似文献
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ZSM-5沸石膜的水热稳定性研究 总被引:2,自引:0,他引:2
考察了ZSM-5沸石膜在400℃水蒸气处理200 h条件下的水热稳定性,用气体渗透实验、XRD、SEM对水蒸气处理前后的膜管进行了表征,比较了两者的差别。实验结果表明,在水蒸气处理后,ZSM-5沸石膜出现一定的脱铝现象。对气体的渗透率由原来的1.45×10-7mol/(Pa·s·m2)降为2.9×10-8mol/(Pa·s·m2),然后趋于稳定。根据表征结果。对ZSM-5沸石膜的脱铝现象进行了讨论,分析了ZSM-5沸石膜脱铝的机理以及在高温条件下水蒸气处理对ZSM-5沸石膜的影响规律,为工业放大研究沸石膜乙苯催化脱氢制苯乙烯过程提供参考。 相似文献
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