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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 >Effect of crystallization time on properties and catalytic performance of nanostructured SAPO-34 molecular sieve synthesized at high temperatures for conversion of methanol to light olefins
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Effect of crystallization time on properties and catalytic performance of nanostructured SAPO-34 molecular sieve synthesized at high temperatures for conversion of methanol to light olefins

机译：结晶时间对高温合成甲醇制轻质烯烃纳米SAPO-34分子筛性能和催化性能的影响

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摘要

SAPO-34 molecular sieves were synthesized via high temperature hydrothermal method. The effects of crystallization time and temperature on physicochemical properties and catalytic performance were studied toward methanol to light olefins. The samples were characterized by XRD, FESEM, PSD, EDX, BET and FTIR techniques. The XRD patterns confirmed the influence of crystallization time and temperature on the crystallinity, phase purity and crystallite size. Also, all synthesized catalysts have nanosized crystallites, obtained by Scherrer formula. The relative crystallinity was enhanced by the increasing of crystallization time and then decreased which can be correlated well with recrystallization at high temperature and long crystallization time. By synthesis at high temperature, more nuclei were produced that leads to lower particle size compared to low temperature synthesis procedure. In addition, it was concluded that the impact of crystallization temperature on particle size is much more than that of crystallization time. It was found that the hydrothermal synthesis conditions greatly affected on the morphology, particle size, purity and textural properties. The synthesized catalyst at 300 T and 3 h has the best performance in terms of the lifetime and olefins selectivity. This catalyst showed 90% selectivity toward light olefins and 94% methanol conversion for more than 600 min. The catalysts synthesized via high temperature hydrothermal method have higher lifetime than the one produced by the conventional method, indicated more effectiveness of this method. (C) 2014 Elsevier B.V. All rights reserved.
机译：通过高温水热法合成了SAPO-34分子筛。研究了结晶时间和温度对甲醇制轻质烯烃的理化性质和催化性能的影响。通过XRD，FESEM，PSD，EDX，BET和FTIR技术对样品进行表征。 XRD图谱证实了结晶时间和温度对结晶度，相纯度和微晶尺寸的影响。而且，所有合成的催化剂均具有通过Scherrer公式获得的纳米尺寸的微晶。相对结晶度通过增加结晶时间而增加，然后降低，这与高温下重结晶和较长的结晶时间密切相关。通过高温合成，与低温合成程序相比，产生了更多的核，导致更低的粒度。另外，可以得出结论，结晶温度对粒度的影响远大于结晶时间的影响。发现水热合成条件对形态，粒径，纯度和质构性质有很大影响。就寿命和烯烃选择性而言，在300 T和3 h时合成的催化剂具有最佳性能。该催化剂对轻烯烃的选择性为90％，甲醇转化率为94％，反应时间超过600分钟。通过高温水热法合成的催化剂比传统方法制备的催化剂具有更高的寿命，表明该方法更有效。 （C）2014 Elsevier B.V.保留所有权利。

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