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首页> 外文期刊>Catalysis science & technology >Desilicated zeolite BEA for the catalytic cracking of LDPE: the interplay between acidic sites' strength and accessibility
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Desilicated zeolite BEA for the catalytic cracking of LDPE: the interplay between acidic sites' strength and accessibility

机译：Desilicated沸石催化裂化BEA低密度聚乙烯:酸性网站的之间的相互作用强度和可访问性

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摘要

Catalytic cracking of low-density polyethylene by BEA zeolites evidenced the mutual dependence of speciation and accessibility of the acidic sites, which are either inherent to the microporous structure or reachable from the newly developed mesoporous surface. FT-IR spectroscopic evaluation coupled with GC-MS product analysis in combination with thermogravimetric analysis allows the acidic function of the sites to be related to the catalytic performance. Results show that the enhanced number of acidic sites available for LDPE is not as important as the number of highly acidic Si(OH)Al groups hosted in the internal voids of the microporous environment. Microporous beta zeolite is more catalytically active towards cracking since it provides a high number of Si(OH) Al zeolite-type groups of high strength. The mesoporosity benefitted in the LDPE cracking when the strength of the protonic acid sites remained above the level of 80% of the original one. The reduced acidic strength by further mesoporosity development is not compensated by the high amount of easily accessible sites; thus, the mesoporosity effect fails.
机译：低密度聚乙烯的催化裂化BEA沸石证明的相互依赖物种形成酸性的和可访问性网站,这是固有的微孔新开发的结构或可获得的介孔表面。评估产品加上gc - ms分析结合热重量分析允许的酸性功能网站相关的催化性能。表明,增强酸性网站的数量可用于低密度聚乙烯不是一样重要高酸性的Si (OH)基地组织举办内部微孔的空隙环境。对开裂自催化地活跃提供了大量的Si (OH) zeolite-type高强度组。受益的低密度聚乙烯裂解时的力量质子的酸的网站上面80%的原始水平。酸性强度通过进一步中孔隙发展不是由高额补偿方便的网站;失败中孔隙的影响。

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