期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 10, 期 29, 页码 15698-15707出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ta02198f
关键词
-
资金
- National Key R&D Program of China [2018YFA0209403]
- National Natural Science Foundation of China [91934301, 22178059]
- Natural Science Foundation of Fujian Province, China [2020J01513]
- Qingyuan Innovation Laboratory [00121002]
PK3 acts as a multifunctional template for synthesizing single-crystal hierarchical zeolites, inhibiting crystal growth to form nanocrystals, and eventually forming single-crystal zeolite particles. The easy removal of PK3 with simple acid treatment enables a nitrogen-/halogen-free and combustion-free route for hierarchical zeolite synthesis.
Hierarchical zeolites show great promise in green chemical and petrochemical processes, but their syntheses usually involve the use of nitrogen-/halogen-containing templates whose removal from the as-synthesized zeolites via calcination inevitably leads to serious environmental pollution, high energy consumption and sometimes destruction of zeolite frameworks. We report an eco-friendly and acid-degradable polymer denoted as PK3 as a multifunctional template to synthesize single-crystal hierarchical zeolites. It is shown that by strongly interacting with zeolite aluminosilicate gel precursors, PK3 acts as a structure-directing agent for the nucleation and crystallization of the amorphous gel into protozeolite crystals, and via its adsorption on the surfaces of protozeolite crystals, PK3 greatly inhibits their growth and thereby results in the formation of zeolitic nanocrystals. Furthermore, these thermodynamically unstable nanocrystals encapsulating PK3 spontaneously aggregate, then align in an oriented manner, and at last ripen, leading to the formation of single-crystal zeolite particles with interconnected mesopores. Importantly, the removal of PK3 from the as-synthesized zeolites can be achieved by a simple acid treatment. Thanks to these unique characteristics of PK3, a nitrogen-/halogen-free and combustion-free route is successfully achieved for synthesizing hierarchical MFI, MOR and GME zeolites. Moreover, the synthesized MFI zeolite exhibits superior catalytic activity in cracking low-density polyethylene.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据