共查询到19条相似文献,搜索用时 140 毫秒
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采用碳硫元素分析(CS)、催化剂氮含量分析(CAT-N)、热重 质谱联用分析(TG-MS)以及低温静态N2物理吸附等技术手段,分别对在中型固定床渣油加氢实验装置上运转0(硫化后)、162、262、562 h后的卸出加氢脱金属催化剂进行表征,以研究高氮低硫类渣油加氢过程运转初期催化剂失活快的原因。结果表明:在相同催化剂级配体系和相同工艺条件下,与加工高硫低氮类沙特阿拉伯轻质原油的渣油原料(沙轻渣油)的脱金属催化剂相比,加工高氮低硫类仪长管输原油的渣油原料(仪长渣油)的脱金属催化剂上形成了更多的积炭,沉积的硫化物略少,而氮化物较多;加工仪长渣油的脱金属催化剂上形成了更多的高温型积炭,且相比加工沙轻渣油的脱金属催化剂上形成的高温型积炭更难氧化燃烧;积炭对加工仪长渣油的脱金属催化剂的孔结构性质影响更大,比表面积、孔体积均低于加工沙轻渣油的脱金属催化剂,大孔占比更低。 相似文献
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渣油加氢脱金属催化剂快速评价方法渣油中沥青质、结焦母体及金属卟啉化合物往往使催化剂迅速失活,以致装置停工。为此,需要使用高性能的加氢脱硫催化剂和脱金属催化剂。脱金属催化剂可将渣油中有机金属(如镍、钒)化合物加以分解,并捕捉、容存这些金属,从而保护脱硫... 相似文献
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以减压渣油为原料,在STRONG沸腾床渣油加氢装置上进行了试验,考察了催化剂活性变化的规律,根据催化剂失活的3个阶段,建立了催化剂失活模型并进行了模型验证。结果表明:运行初期反应温度对催化剂失活具有明显的加速作用,运行中期催化剂的活性主要取决于催化剂的金属沉积量;建立的模型预测值与实验值吻合得较好,表明该模型具有较好的准确性,可反映沸腾床渣油加氢催化剂失活的规律。 相似文献
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采用由硫酸铝法制得的氧化铝干胶为原料制备出催化剂载体,在该载体上浸渍Mo和Ni活性组分,并经焙烧后制得FZC-24 B型渣油加氢脱金属催化剂.以沙中常压渣油为原料,在200 mL固定床加氢装置上进行了FZC-24 B型催化剂的稳定性考察实验,并与国产同类型参比催化剂G-1进行了性能对比.结果表明,在运转初期,二者均表现出较高的脱金属活性;但当运转时间大于1 000 h后,FZC-24 B型催化剂的活性保持平稳,金属Ni与V的脱除率稳定在60%,而参比剂的活性则下降较快.工业放大制备FZC-24 B型催化剂的物性重复了实验室制备该催化剂的结果. 相似文献
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海尔德 托普索公司开发了新一代渣油加氢催化剂。中型装置运转表明 ,脱金属活性进一步改进 ,新一代催化剂TK719(加氢脱金属性能佳 )、TK75 3和TK773(加氢脱硫性能佳 )的脱金属活性均优于上一代催化剂TK70 9,TK75 1和TK771。原料为科威特常压渣油 ,含镍和钒 81μg/g ,硫4.3% ,运转要求被转化的渣油含硫达 0 .5 % ,使用新一代催化剂时 ,产品含镍和钒为 9~ 14μg/g ,上一代催化剂为16~ 2 0 μg/g。新一代催化剂己成功应用于工业生产 ,包括催化裂化装置原料减压馏分油 /渣油调合料的预处理和重油催化裂化装置原料渣油的预处理。托普索公… 相似文献
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渣油加氢装置反应温度操作初探 总被引:1,自引:0,他引:1
介绍渣油加氢处理装置在催化剂床层平均反应温度相同时,各催化剂床层反应温度的不同组合对产品质量和装置运转周期的影响。试验结果表明,在渣油加氢催化剂的级配装填系统中,催化剂床层平均反应温度相同时各催化剂床层反应温度的不同组合对加氢常压渣油产品性质影响较小。为了保持加氢装置的长周期运转,各催化剂床层反应温度不应随意调整,脱金属催化剂的反应温度应有一低限值。 相似文献
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采用IR、TG、低温N2-吸附等表征手段对用于甲醇制丙烯(MTP)反应的高硅小晶粒ZSM-5 催化剂的结焦和失活过程进行研究,结果表明, ZSM-5催化剂具有良好的水热稳定性;分子筛孔道中的可溶性结焦主要以三甲基苯为主,含量存在一个积累过程,并在48h 达到最大值,随后保持相对稳定;分子筛表面积炭堵塞孔道是导致催化剂失活的主要原因,即积炭量随反应时间延长而持续增加,当其外表面容纳不了更多的积炭时,形成的积炭物质将堵塞沸石孔口,从而使得催化剂在770h后突然失活。 相似文献
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《中国炼油与石油化工》2017,(2)
The deactivation of a Ni-Mo-W/Al_2O_3 catalyst during ultra-low-sulfur diesel production was investigated in a pilot plant. The reasons of catalyst deactivation were analyzed by the methods of elemental analysis, BET and TG-MS. The results showed that the catalyst deactivation rate was notable at the beginning of run, and then gradually reached a steady state after 448 h. In the initial period the catalyst deactivation may mainly be caused by the formation of the carbon deposits. The carbon deposits blocked the catalyst pores and the accessibility of active center decreased. The TG-MS analysis identified three types of carbon species deposited on the catalysts, viz.: the low temperature carbon deposit with high H/C atomic ratio, the medium temperature carbon deposit, and the high temperature carbon with low H/C atomic ratio. The amount of high temperature carbon deposits on the catalyst determined the overall activity and, therefore the high temperature carbon was a major contributor to the deactivation of Ni-Mo-W catalyst. 相似文献
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The effect of reactant-catalyst (R-C) interaction on the activation and deactivation of a 0.5 Ni, 1.0 ReO
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/Al2O3 catalyst during the dehydrocyclohexamerization of methane to benzene has been studied. The R-C interaction involves partial
reduction of the catalyst and the buildup of at least two forms of carbon deposit. It has been found that the catalyst activation
time shortens with an increase in the amount of carbon deposit remaining after treatment with air. A comparison of the initial
(3 min) and maximal (20 min of experimental run) benzene formation rates with the quantity of carbon deposit remaining on
the catalyst after air treatment has shown that the carbon deposit is responsible for the subsequent oligomerization and dehydrocyclization
functions of the C2H
y
intermediates produced owing to oxygen bonded to the catalyst. It has been suggested that the catalyst deactivation during
the reaction is associated with a decrease in the concentration of bound oxygen. 相似文献
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The deactivation of Ni-Mo-W/Al2O3 catalyst in ultra-low-sulfur diesel production was investigated on a pilot plant. The reasons of catalyst deactivation were analyzed by the method of element analysis, BET and TG-MS. The results showed that the catalyst deactivation rate was obvious at the beginning of running, and then gradually reached a steady state after 448 h. In initial period the catalyst deactivation reason may mainly due to the formation of the carbon deposit. The carbon deposit blocked catalyst channel and the accessibility of active center decreased. The TG-MS analysis identified three types of carbon species deposited on the catalysts, the low temperature carbon deposit with high H/C atomic ratio, the medium temperature carbon deposit and the high temperature carbon with low H/C atomic ratio. The amounts of high temperature carbon deposit on catalyst determined the overall activity and, therefore the high temperature carbon was a major contributor to the deactivation of Ni-Mo-W catalyst. 相似文献
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为了进一步掌握装置的运行性能,对中国石化海南炼油化工有限公司2.48Mt/a柴油加氢改质MHUG-Ⅱ装置生产满足国Ⅳ和国V排放要求清洁柴油(简称Ⅳ柴油和国Ⅴ柴油)的长周期运行情况进行了分析和预测。该装置自开工至2015年6月30日,生产国Ⅳ柴油的时间累计479天,生产国Ⅴ柴油的时间累计146天。运转分析结果表明,改质反应器中精制和改质催化剂平均失活速率分别为0.015℃/d和0.042℃/d,精制反应器中催化剂平均失活速率为0.055℃/d,两个反应器的总压降上升速率为6.4×10-4MPa/d。综合考虑原料性质和组成的变化、国Ⅳ柴油和国Ⅴ柴油轮换生产对催化剂寿命的影响以及反应器压降等因素,预测出精制反应器催化剂可再运行620天,即催化剂总运行时间可达3年以上。 相似文献