Highly Ordered Mesoporous Al-MCM-41 Synthesis through Valorization of Natural Sediment

Boldrini, Diego Emmanuel; Angeletti, Sabrina; Cervellini, Patricia Marta; Reinoso, Deborath Mariana

doi:10.1021/acssuschemeng.8b04164

Cited by 19 publications

(5 citation statements)

References 54 publications

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“…The XRD patterns of all samples exhibit diffraction peak at 37.76°, indicating the presence of TiO 2 phase 36 . The samples have the diffraction peaks at 2θ = 2.16°, 3.73°, and 4.31°, which agrees with the characteristic diffraction of the Al‐MCM‐41 37 . The samples have the diffraction peaks at 2θ = 6.23°, 10.19°, 15.75°, and 23.77°, which agrees with the characteristic diffraction of the HY zeolite 38 .…”

Section: Resultssupporting

confidence: 69%

Hydroxymethylation of xylenol over micro/mesoporous TiO₂‐containing bifunctional catalyst: Effect of the Y zeolite incorporation with MCM‐41

Tao

Feng

et al. 2020

Asia-Pacific J Chem Eng

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The hydrodemethylation reaction of 3,4-xylenol on micro/mesoporous catalysts with active component TiO 2 was studied. TiO 2 /YM-m and TiO 2 /YM-c micro/mesoporous materials were, respectively, derived by loading TiO 2 with the composition and mechanical mixing of Al-MCM-41 and HY zeolite. The effect of the bifunctional catalysts on the catalytic performance of hydroxymethylation of xylenol before and after the introduction of Al-MCM-41 into HY was investigated in this study. Compared with TiO 2 /Y catalyst, TiO 2 / MCM-41, TiO 2 /YM-m, and TiO 2 /YM-c have higher selective dealkylation products, especially the selectivity of cresol. This is attributed to the addition of Al-MCM-41 mesoporous molecular sieve to eliminate diffusion limitation. Compared with TiO 2 /YM-m catalyst, the TiO 2 /YM-c composite with Al-MCM-41 coated structure grown on the surface of HY crystals has better catalytic conversion activity and ability to inhibit secondary reactions. This is because of the existence of the special "coating" of HY zeolite, which eliminates the diffusion limitation and prevents the product and the reaction intermediate from entering the micropores for multiple reactions, thereby reducing the occurrence of side reactions. Meanwhile, TiO 2 /YM-c catalyst has the best demethylation performance under the optimal reaction conditions, the conversion of 3,4-xylenol, the selectivity to phenol, and m-cresol were 52.15%, 62.17%, and 36.32%, respectively. And the TiO 2 /YM-c catalyst has good stability within 80 h of reaction.

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Section: Resultssupporting

confidence: 69%

Hydroxymethylation of xylenol over micro/mesoporous TiO₂‐containing bifunctional catalyst: Effect of the Y zeolite incorporation with MCM‐41

Tao

Feng

et al. 2020

Asia-Pacific J Chem Eng

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“…TGA of the as-synthesized and calcined Sn-In-MCM-41 were carried out. As can be seen in Figure S1, the as-synthesized MCM-41 sample shows several weight losses usually found in literature . Weight loss below 130 °C is related to the presence of physisorbed water in the surface or inside the pores of the MCM-41, losses between 130–325 °C are mainly caused by the degradation of the surfactant, and losses above 300 °C correspond to the oxidation of carbonaceous species and the removal of water during the condensation of silanol groups.…”

Section: Resultssupporting

confidence: 53%

“…As can be seen in Figure S1 , the as-synthesized MCM-41 sample shows several weight losses usually found in literature. 48 Weight loss below 130 °C is related to the presence of physisorbed water in the surface or inside the pores of the MCM-41, losses between 130–325 °C are mainly caused by the degradation of the surfactant, and losses above 300 °C correspond to the oxidation of carbonaceous species and the removal of water during the condensation of silanol groups. The main weight loss in the as-synthesized sample is due to the presence of the surfactant that acts as the organic structure-directing agent (OSDA) to obtain the MCM-41 structure.…”

Section: Resultsmentioning

confidence: 99%

Mesoporous Sn-In-MCM-41 Catalysts for the Selective Sugar Conversion to Methyl Lactate and Comparative Life Cycle Assessment with the Biochemical Process

Iglesia

Sarango

Munárriz

et al. 2022

ACS Sustainable Chem. Eng.

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The use of biomass for the production of energy and higher added value products is a topic of increasing interest in line with growing environmental concerns and circular economy. Mesoporous material Sn-In-MCM-41 was synthesized for the first time and used as a catalyst for the transformation of sugars to methyl lactate (ML). This catalyst was characterized in depth by various techniques and compared with Sn-MCM-41 and In-MCM-41 catalysts. In the new Sn-In-MCM-41 material, both metals, homogeneously distributed throughout the mesoporous structure of MCM-41, actuate in a cooperative way in the different steps of the reaction mechanism. As a result, yields to ML of 69.4 and 73.9% in the transformation of glucose and sucrose were respectively reached. In the case of glucose, the ML yield 1.5 and 2.6 times higher than those of Sn-MCM-41 and In-MCM-41 catalysts, respectively. The Sn-In-MCM-41 catalyst was reused in the transformation of glucose up to four cycles without significant loss of catalytic activity. Finally, life cycle assessment comparison between chemical and biochemical routes to produce ML allowed us to conclude that the use of Sn-In-MCM-41 reduces the environmental impacts compared to Sn-MCM-41. Nevertheless, to make the chemical route comparable to the biochemical one, improvements in the catalyst and ML synthesis have to be achieved.

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“…Figure S5A shows the XPS spectrum of Meso-SiHAp@MPN which confirms the presence of Si 2p , O 1S , C 1S , P 2S , Ca 2p , and Mg 2p . The high-resolution spectra of Si 2p , O 1S , and C 1S are also shown in Figure S5B–D. ,− …”

Section: Resultsmentioning

confidence: 97%

Nanocore–Shell Bone Filler Contained Mesoporous Silica Modified with Hydroxyapatite Precursors; Wrapped in a Natural Metal–Phenolic Network

Bahadorani,

Hadadzadeh,

Mirahmadi-Zare

et al. 2023

Langmuir

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Various therapeutic strategies have been developed to address bone diseases caused by aging society and skeletal defects caused by trauma or accidental events. One such approach is using bone fillers, such as hydroxyapatite (HA) and bioactive glasses. Although they have provided effective osteogenesis, infection and inflammation due to the surgical procedure and uncontrolled ion release can hinder the efficiency of bone regeneration. In response to these challenges, immobilizing a neutral metal−phenolic network on the surface of osteoconductive nanoparticles would be the master key to achieving a gradual, controlled release during the mineralization period and reducing infection and inflammation through biological pathways. In this regard, a mesoporous silica nanocomposite modified by an HA precursor was synthesized to enhance bone regeneration. In addition, to improve the therapeutic effects, its surface was wrapped with a magnesium−phenolic network made from pomegranate extract, which can simultaneously produce anti-inflammatory and antibacterial effects. The obtained core−shell nanocomposite was characterized by its physicochemical properties, biocompatibility, and bioactivity. The in vitro studies revealed that the synthesized nanocomposite exhibits higher osteogenic activity than the control groups, as confirmed by alizarin red staining. Moreover, the nanocomposite maintained low toxicity as measured by the 3-(4,5dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium (MTS) assay and increased antibacterial activity against Staphylococcus aureus and Escherichia coli compared with the control groups. Therefore, this research presents a promising strategy for bone regeneration, combining the advantages of mesoporous silica nanocomposite modified by an HA precursor with the beneficial effects of a magnesium−phenolic network.

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Highly Ordered Mesoporous Al-MCM-41 Synthesis through Valorization of Natural Sediment

Cited by 19 publications

References 54 publications

Hydroxymethylation of xylenol over micro/mesoporous TiO₂‐containing bifunctional catalyst: Effect of the Y zeolite incorporation with MCM‐41

Hydroxymethylation of xylenol over micro/mesoporous TiO₂‐containing bifunctional catalyst: Effect of the Y zeolite incorporation with MCM‐41

Mesoporous Sn-In-MCM-41 Catalysts for the Selective Sugar Conversion to Methyl Lactate and Comparative Life Cycle Assessment with the Biochemical Process

Nanocore–Shell Bone Filler Contained Mesoporous Silica Modified with Hydroxyapatite Precursors; Wrapped in a Natural Metal–Phenolic Network

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Highly Ordered Mesoporous Al-MCM-41 Synthesis through Valorization of Natural Sediment

Cited by 19 publications

References 54 publications

Hydroxymethylation of xylenol over micro/mesoporous TiO2‐containing bifunctional catalyst: Effect of the Y zeolite incorporation with MCM‐41

Hydroxymethylation of xylenol over micro/mesoporous TiO2‐containing bifunctional catalyst: Effect of the Y zeolite incorporation with MCM‐41

Mesoporous Sn-In-MCM-41 Catalysts for the Selective Sugar Conversion to Methyl Lactate and Comparative Life Cycle Assessment with the Biochemical Process

Nanocore–Shell Bone Filler Contained Mesoporous Silica Modified with Hydroxyapatite Precursors; Wrapped in a Natural Metal–Phenolic Network

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Hydroxymethylation of xylenol over micro/mesoporous TiO₂‐containing bifunctional catalyst: Effect of the Y zeolite incorporation with MCM‐41

Hydroxymethylation of xylenol over micro/mesoporous TiO₂‐containing bifunctional catalyst: Effect of the Y zeolite incorporation with MCM‐41