Synthesizing hierarchically porous SAPO-11 with polyvinyl alcohol phosphates as mesopore template: effects of phosphorus content and concentration of templates

IF 2.5 4区材料科学 Q2 CHEMISTRY, APPLIED Journal of Porous Materials Pub Date : 2024-06-13 DOI:10.1007/s10934-024-01646-0

Chuangye Wang, Huili Liu, Jintang Xue, Ruixue Sun, Xinrong Song, Xinyi Zhang, Longli Zhang

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Abstract

Introducing the second mesopores into SAPO-11 molecular sieve will be much helpful to improve the catalytic performance of its metal-supported catalysts in hydroisomerization of normal alkanes. In current paper, polyvinyl alcohol phosphates with different phosphorus contents were prepared and employed as mesopore template to prepare hierarchical SAPO-11. The effects of phosphorus content and concentration on the properties including mesopore structure, acidity and morphology of the prepared SAPO-11s have been investigated. The results showed that with appropriate phosphorus content and template concentration, PPVAs efficiently directed the generation of regular mesopore structure, extended the surface area and improved the acidity of the SAPO-11 molecular sieves. Pt/SAPO-11 bi-functional catalysts were prepared and their catalytic performances in hydroisomerization of n-hexane were evaluated. The highest conversion read 59.3%, while the optimal selectivity of branched hexanes was 86.5%.

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以聚乙烯醇磷酸盐为中孔模板合成分层多孔 SAPO-11：磷含量和模板浓度的影响

在 SAPO-11 分子筛中引入第二个介孔将大大有助于提高其金属支撑催化剂在普通烷烃加氢异构化中的催化性能。本文制备了不同磷含量的聚乙烯醇磷酸盐，并将其作为中孔模板制备了分层 SAPO-11。研究了磷含量和浓度对所制备 SAPO-11 的介孔结构、酸度和形态等性能的影响。结果表明，在适当的磷含量和模板浓度下，PPVAs 能有效地引导生成规则的介孔结构，扩大表面积，并改善 SAPO-11 分子筛的酸度。制备了 Pt/SAPO-11 双功能催化剂，并评估了它们在正己烷加氢异构化中的催化性能。最高转化率为 59.3%，支链己烷的最佳选择性为 86.5%。

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来源期刊

Journal of Porous Materials 工程技术-材料科学：综合

CiteScore

4.80

自引率

7.70%

发文量

203

审稿时长

2.6 months

期刊介绍： The Journal of Porous Materials is an interdisciplinary and international periodical devoted to all types of porous materials. Its aim is the rapid publication of high quality, peer-reviewed papers focused on the synthesis, processing, characterization and property evaluation of all porous materials. The objective is to establish a unique journal that will serve as a principal means of communication for the growing interdisciplinary field of porous materials. Porous materials include microporous materials with 50 nm pores. Examples of microporous materials are natural and synthetic molecular sieves, cationic and anionic clays, pillared clays, tobermorites, pillared Zr and Ti phosphates, spherosilicates, carbons, porous polymers, xerogels, etc. Mesoporous materials include synthetic molecular sieves, xerogels, aerogels, glasses, glass ceramics, porous polymers, etc.; while macroporous materials include ceramics, glass ceramics, porous polymers, aerogels, cement, etc. The porous materials can be crystalline, semicrystalline or noncrystalline, or combinations thereof. They can also be either organic, inorganic, or their composites. The overall objective of the journal is the establishment of one main forum covering the basic and applied aspects of all porous materials.