Abstract:

A series of hydrothermally stable composites with graded pores were synthesized via insitu assembly of zeolite Y precursors by carbon black/P123 templatesThe graded composites were characterized by means of XRD, FT-IR, TEM, BET and NH_3-TPDThe results of FT-IR showed that the primary and secondary structural building units of zeolite Y were introduced into the wall of zeolitesThe results of BET and TEM suggested that the composites had interconnected hierarchical pore structure (0.39 nm-3.8 nm-6.5 nm-19.9 nm).The surface area and pore volume were 693 m²·g^-1 and 1.89 ml·g^-1 respectivelyAfter hydrothermal treatment at 100% steam, 800℃ for 2 h and 4 h, the remaining fractions of surface area were 80.1% and 35.1% respectively, while the remaining fractions of pore volume were 45.0% and 25.4% respectivelyThe present paper provides a novel route for fabricating materials with graded pores and high hydrothermal stability which are candidates for heavy oil cracking catalysts.

Key words:

梯度孔, 组装, 前驱体, 双重模板

摘要：

采用炭黑/P123(聚环氧乙烯醚聚环氧丙烯醚聚环氧乙烯醚三嵌段聚合物，即EO_20O₇₀EO₂₀，平均相对分子质量5800)双重模板剂，对Y型分子筛前驱体进行组装合成了具有原位梯度孔及高水热稳定性的材料。FT-IR结果表明，组装过程将Y型分子筛的初级和次级结构单元引入分子筛的孔壁之中。BET和TEM结果表明，材料具有相互贯通的梯度孔道(0.39 nm-3.8 nm-6.5 nm-19.9 nm)，比表面积693 m²·g^-1，孔容1.89ml·g^-1。在800℃、100％水蒸气处理2 h和4 h后，比表面积保留率分别为80.1%和35.1%，孔容保留率分别为45.0%和25.4%。为重油大分子的催化裂化提供了一种具有潜在应用价值的材料。

关键词:

梯度孔, 组装, 前驱体, 双重模板