Synthesis, Characterization and Catalytic Performance of Well-ordered Crystalline Heteroatom Mesoporous MCM-41

Abstract

Abstract：The mesoporous heteroatom molecular sieve MCM-41 bulk crystals with the crystalline phase were synthesized via a one-step hydrothermal method using an ionic complex as template. The ionic complex template was formed by interaction between cetyltrimethylammonium ions and metal complex ion [M (EDTA)] 2-(M=Co or Ni ). The materials were characterized by X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, N2 adsorption-desorption isotherms, and X-ray absorption fine structure spectroscopy. The results showed that the materials possess a highly ordered mesoporous structure with the crystalline phase and possess high uniform ordered arrangement channels. The structure is in the vertical cross directions with a crystalline size of about 12 µ m and high specific surface areas. The metal atoms were incorporated into the zeolite frameworks in the form of octahedral coordinate and have a uniform distribution in the materials. The amount of metal complexes formed by metal ion and EDTA is an essential factor for the formation of the vertical cross structure. Comparing to Si-MCM-41, the samples exhibited better conversion, higher selectivity for cumene cracking.

Acid‐etched Pt/Al‐MCM‐41 catalysts for fuel production by one‐step hydrotreatment of Jatropha oil

“…Because acid sites are essential for hydrotreatment, raw MCM‐41 always demonstrates limited catalytic activity. Therefore, acidic components, such as heteropoly acid, or heteroatoms, such as Al, were incorporated in the structure to increase the acidity of MCM‐41‐based catalysts (Qin et al, 2017; Sun et al, 2020; Wu et al, 2016; Yan et al, 2019). For example, Fan et al (2020) prepared SAPO‐18 molecular sieves with hierarchical pores for the first time using various acids.…”