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首页> 外文期刊>Powder Technology: An International Journal on the Science and Technology of Wet and Dry Particulate Systems >Thorough study of the effect of metal-incorporated SAPO-34 molecular sieves on catalytic performances in MTO process
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Thorough study of the effect of metal-incorporated SAPO-34 molecular sieves on catalytic performances in MTO process

机译：深入研究了金属结合的SAPO-34分子筛对MTO工艺催化性能的影响

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SAPO-34 and MeAPS0-34s (Me = Fe, Co, Ni, La and Ce) molecular sieves were synthesized and used as catalysts for conversion of methanol to light olefins. X-ray diffraction, scanning electron microscopy, nitrogen adsorption desorption inductively coupled plasma mass spectrometry, Fourier transform infrared spectroscopy and temperature programmed desorption techniques were used to characterize the synthesized catalysts. Thermogravimetric analysis was used to investigate the amount of coke deposited on the spent catalysts during the reaction. The synthesized MeAPS0-34s had the same chabazite topology structure, while metal incorporation gave rise to the different micropore area and acidity. All the SAPO-34 and MeAPS0-34 molecular sieves were very active and selective catalyst for light olefins production. Metal incorporation improved the catalyst lifetime and favored the ethylene and propylene product. Concerning the yield of light olefins at 425 C and 1 bar, NiAPSO-34 favored ethylene production and CeAPSO-34 and LaAPSO-34 were helpful for propylene production. Light olefins yield decreased with time on stream for all the samples; although, this decrease rate is lower for MeAPS0-34 than for the parent SAPO-34. The catalyst lifetime increased in an order as follows: Ce- > La- > Co- > Ni- > Fe- > SAPO-34. The rare earth modified catalysts exhibited lower methanation than parent SAPO-34 and transition metal modified catalysts. (C) 2015 Elsevier B.V. All rights reserved.
机译：合成了SAPO-34和MeAPS0-34s（Me = Fe，Co，Ni，La和Ce）分子筛，并将其用作将甲醇转化为轻质烯烃的催化剂。利用X射线衍射，扫描电子显微镜，氮吸附脱附电感耦合等离子体质谱，傅里叶变换红外光谱和程序升温脱附技术对合成催化剂进行了表征。使用热重分析法研究反应期间沉积在废催化剂上的焦炭量。合成的MeAPS0-34具有相同的菱沸石拓扑结构，而金属的引入引起了不同的微孔面积和酸度。所有的SAPO-34和MeAPS0-34分子筛都是活性很强的选择性催化剂，可用于生产轻质烯烃。金属的引入改善了催化剂寿命，并有利于乙烯和丙烯产物。关于在425℃和1巴下的轻烯烃的产率，NiAPSO-34有利于乙烯生产，而CeAPSO-34和LaAPSO-34有助于丙烯生产。所有样品的轻质烯烃产率均随着生产时间的延长而降低;但是，对于MeAPS0-34，此降低率要比对父SAPO-34的降低率低。催化剂寿命按以下顺序增加：Ce-> La-> Co-> Ni-> Fe-> SAPO-34。稀土改性的催化剂显示出比母体SAPO-34和过渡金属改性的催化剂低的甲烷化率。 （C）2015 Elsevier B.V.保留所有权利。

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