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

Abstract

Abstract: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, N 2 adsorption-desorption isotherms, and X-ray absorption fine structure spectroscopy. The results showed that the materials possess a highly-ordered mesoporous structure with a crystalline phase and possess highly uniform ordered arrangement channels. The structure is in the vertical cross directions with a crystalline size of about 12 µm 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. Compared to Si-MCM-41, the samples exhibited better conversion and higher selectivity for cumene cracking.

Application of different molecular sieves in photothermal catalysis of Jatropha oil

“…Thus, nonedible vegetable oils and fats are ideal materials for the preparation of aviation kerosene. Common raw materials include vegetable oils extracted from oilseed crops, such as soybean, rapeseed, castor, Jatropha, or plants with high oil content [13][14][15][16] . The preparation methods of aviation kerosene include Fischer-Tropsch synthesis [4,9] , fatty acid esterification technology, catalytic hydrogenation technology, alkane cracking and isomerization technology, and photothermal catalysis [17][18][19] .…”

Efficient and reusable SBA-15-immobilized Brønsted acidic ionic liquid for the ketalization of cyclohexanone with glycol

“…30,31 All these make SBA-15 a potential candidate to act as suitable supports. [32][33][34][35] In these papers, a series of heterogeneous catalysts, mesoporous materials SBA-15 and amorphous SiO 2 immobilized SO 3 H-functionalized ionic liquid was synthesized. And the surface properties of the obtained catalysts were characterized by elemental analysis, Fourier transform infrared (FT-IR) spectra, scanning electron microscopy (SEM), thermogravimetry/differential scanning calorimetry (TG/DSC) and N 2 adsorption-desorption isotherms (BET).…”

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.…”