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Luigi Cavallo, Luis Miguel Azofra, Natalia Morlanés, Albert Poater, Manoja K Samantaray, Balamurugan Vidjayacoumar, Khalid Albahily, Jean-Marie Basset
Very stable in-operando and low-loaded atomic molybdenum on solid support materials have been prepared and tested to be catalytically active for N₂-into-NH₃ hydrogenation. Ammonia synthesis is reported at atmospheric pressure and 400°C with NH₃ rates of ca. 1.3·10³ μmol h¯¹ gMo¯¹ using a well-defined Mo-hydride grafted on silica (SiO₂-700). DFT modelling on the reaction mechanism suggests that N₂ spontaneously binds on monopodal [(≡Si-O-)MoH₃]. Based on calculations, the fourth hydrogenation step involving the release of the first NH₃ molecule represents the rate-limiting step of the whole reaction...
October 11, 2018: Angewandte Chemie
Yogita Soni, I Kavya, T G Ajithkumar, C P Vinod
A modified deposition precipitation (DP) method has been developed to address a fundamental issue of supporting well dispersed Au nanoparticles on silica. Ammonium chloride (NH4Cl) plays an important role in in situ modifying the gold precursor (HAuCl4·3H2O) solution allowing facile deposition of gold NPs in the channels of SBA-15. The Au-SBA-15 catalyst (2.8 wt%) synthesized by this procedure showed 100% conversion for CO oxidation at room temperature with excellent stability at room temperature and high temperature...
October 11, 2018: Chemical Communications: Chem Comm
Qunfeng Yang, Nanzhengfang Jia, Chensi Shen, Jianqing Ma, Yuezhong Wen
Persulfates are recognized as promising oxidants and an alternative to Fenton reaction for water treatment. However, activation methods in hand restrict the practical application. Herein, we explore the possibility of Fe-N complexes being a catalyst for persulfate activation for the first time. The catalyst denoted as Fe-Im-SBA was synthesized from ferric chloride, imidazole, and SBA-15 at high temperature. The internal pore structure of Fe-Im-SBA was maintained well; Fe, N and C elements are evenly distributed on the catalyst...
October 4, 2018: Environmental Science and Pollution Research International
Luhui Wang, Hui Liu, Han Ye, Rong Hu, Shuqing Yang, Guoli Tang, Kunqiang Li, Yanpeng Yang
Ni-CeO₂/SBA-15-V catalyst was prepared by the impregnation method with vacuum thermal treatment and used for CO₂ methanation reaction. Compared with Ni-CeO₂/SBA-15-air catalyst with thermal treatment in air, the reduced Ni-CeO₂/SBA-15-V catalyst with vacuum thermal treatment exhibited higher Ni dispersion and smaller Ni particle size. In CO₂ methanation reaction, the Ni-CeO₂/SBA-15-V catalyst was more active and selective than the Ni-CeO₂/SBA-15-air catalyst. The good activity and selectivity of Ni-CeO₂/SBA-15-V catalyst should be due to highly dispersed Ni in contact with small CeO₂ particles...
September 26, 2018: Nanomaterials
Justin Siefker, Ralf Biehl, Margarita Kruteva, Artem Feoktystov, Marc-Olivier Coppens
While mesoporous silicas have been shown to be a compelling candidate for drug delivery and the implementation of biotechnological applications requiring protein confinement and immobilization, the understanding of protein behavior upon physical adsorption into silica pores is limited. Many indirect methods are available to assess general adsorbed protein stability, such as Fourier-transform infrared spectroscopy and activity assays. However, the limitation of these methods is that spatial protein arrangement within the pores cannot be assessed...
October 2, 2018: Journal of the American Chemical Society
Raimundo Alves Lima Sobrinho, George Ricardo Santana Andrade, Luiz P Costa, Marcelo José Barros de Souza, Anne Michelle Garrido Pedrosa de Souza, Iara F Gimenez
This work reports the preparation of HZSM-5/SBA-15 micro-mesoporous materials with composite structure by mechanosynthesis and their use as templates to micro-mesoporous carbons, with palm oil cooking waste as carbon source. HZSM-5/SBA-15 composites were prepared in different mass proportions (25:75, 50:50 and 75:25) by a mechanosynthetic strategy. The palm oil waste was infiltrated into the template pores by a two-step procedure involving grinding followed by stirring the suspension in an oil solution and carbonization under inert atmosphere...
September 9, 2018: Journal of Hazardous Materials
Nanjing Zhong, Weilin Chen, Liyan Liu, Hongxiao Chen
In this study, mesoporous silica SBA-15 was modified by organic functional groups through silanization. Series of organosilane compounds were grafted onto the SBA-15, and the obtained functionalized carriers were then used to immobilize the lipase from Rhizomucor miehei (RML). The enzymatic properties of the obtained immobilized RML samples were evaluated, and the catalytic efficiencies in glycerolysis of triacylglycerols (TAG) reaction were studied. Compared with the parent SBA-15 immobilized RML, the organic modification gave a maximum improvement of enzymatic activity from 200...
January 15, 2019: Food Chemistry
Guojie Zhang, Peiyu Zhao, Ying Xu, Zhixiu Yang, Haizhu Cheng, Yongfa Zhang
In order to investigate the influence of support structure properties on CO2 capture performances of solid amine adsorbents, a novel three-dimensional disordered porous silica (3dd) with hierarchical pore networks was developed and then compared to other three materials as adsorbent support, namely, hierarchical porous silica (HPS), MCM-41, and SBA-15. They were all functionalized with tetraethylenepentaamine (TEPA) to prepare CO2 adsorbents. The adsorbents' ability to capture CO2 was examined on a fixed-bed reactor...
September 26, 2018: ACS Applied Materials & Interfaces
Cody K Addington, Yun Long, Keith E Gubbins
While much work has been reported on the statistical mechanics and molecular simulation of interfaces of planar and spherical geometries, very little has been published on the interfaces of cylindrical geometry. The cylindrical geometry is important for the study of cylindrical micelles and particularly for nano-phases confined within cylindrical pores since the most well-defined porous materials (e.g., carbon and silicon nanotubes, SBA-15 and KIT-6 silicas) that are presently available are of this geometry...
August 28, 2018: Journal of Chemical Physics
Yue Li, Nanjing Zhong, Ling-Zhi Cheong, Jianrong Huang, Hongxiao Chen, Shaoyan Lin
In this study, SBA-15 was modified by a series of silane coupling reagents and later used to immobilize Candida antartica lipase B (CALB). The enzymatic properties of the immobilized CALB samples were studied. In addition, the catalytic performance in glycerolysis of soybean oil for diacylglycerols (DAG) production was also investigated. The highest enzymatic activity up to 6100.00 ± 246.41 U/g was observed from the propyl methacrylate group modified SBA-15 supported CALB. No loss of activity was observed from the propyl methacrylate group modified SBA-15 supported CALB, but a higher-than-initial activity was notably found from 3-aminopropyl group and n-octyl group modified SBA-15 supported CALB after a 4-h incubation in air at 70 °C...
December 2018: International Journal of Biological Macromolecules
Armand Roucher, Mélanie Emo, François Vibert, Marie-José Stébé, Véronique Schmitt, Florian Jonas, Rénal Backov, Jean-Luc Blin
Traditional porous monoliths Si(HIPE) (High Internal Phase Emulsion), prepared from the Tetradecyltrimethylammonium Bromide (TTAB)/dodecane/water system, offer high specific surface area, mainly due to microporosity. Aside, mesoporous materials SBA-15, prepared from Pluronic P123, have a high specific surface area, but are obtained as powder, which limits their applications. Starting from the mixed TTAB-P123 surfactant, it is expected to tune the mesoporosity of Si(HIPE), while keeping their monolithic character...
January 1, 2019: Journal of Colloid and Interface Science
Shouai Feng, Yixin Li, Hong Liu, Jiangfeng Huang, Chang Ji, Liang Qiao, Baohong Liu, Ji Ji
Mesoporous silica SBA-15 is shown to be a very efficient alternative to phase transfer catalyst salts for two-phase nucleophilic substitutions. The two-phase reaction can efficiently take place in the absence of PTCs. The high catalytic activity and reaction rates can be attributed to the amphiphilic and negatively charged surface of SBA-15 as well as the rapid ingress of the reactants and egress of the products.
August 22, 2018: Chimia
Alvaro Sampieri, Gabriela Pérez-Osorio, Miguel Ángel Hernández-Espinosa, Irving Israel Ruiz-López, Mayra Ruiz-Reyes, Janette Arriola-Morales, Rocío Iliana Narváez-Fernández
Benzene, toluene, ethylbenzene, and p -xylene (BTEX) are hazardous volatile organic compounds mostly released from fuel combustion, paint gas emissions, and biomass burning. In this work, it is studied the BTEX sorption influence on the surface reactivity of a new kind of nanoporous composite, prepared via an in situ functionalization of SBA-15 with a Mg-Al calcined hydrotalcite (HTC ). During its preparation, Mg/Al mixed oxides are indeed formed and dispersed on the SBA-15 surface with non-blockage porosity...
December 2018: Nano Convergence
Nuerbiya Yalikun, Xamxikamar Mamat, Yongtao Li, Xun Hu, Thomas Wågberg, Yemin Dong, Guangzhi Hu
In this study, we developed a sensitive electrochemical sensor for the detection of chloramphenicol (CAP). An iron-nitrogen co-doped ordered mesoporous carbon-silicon nanocomposite (Si-Fe/NOMC) was prepared as follows. First, an SBA-15 surface was treated with an iron and nitrogen co-doped carbon framework obtained from the polymerization of ethylenediamine and carbon tetrachloride via the hard templating method. The mixture was then carbonized at a high temperature (900℃). Finally, the Si-Fe/NOMC modified electrode was fabricated, and employed as a high-performance electrochemical sensor to trace the CAP in drug samples using the large surface area of the hetero-atoms iron, nitrogen and silicon co-doped in the porous structure...
August 9, 2018: Colloids and Surfaces. B, Biointerfaces
Yangyang Ni, Yu Qiao, Fantao Kong, Ruijing Li, Chaoqi Zhang, Aiguo Kong, Yongkui Shan
The copper and phosphorus co-doped porous carbon (Cu-P-C), as an impressive Cu-based electrocatalyst, was directly synthesized by thermal conversion of (Ph3P)2CuCl2 compound in the channels of SBA-15 templates. The prefabricated moieties Cu-Px in (Ph3P)2CuCl2 were retained in the preparation process of the catalysts. The Cu-Px as active sites could effectively catalyze oxygen reduction reaction (ORR). Moreover, the hierarchically porous morphology of Cu-P-C material with large specific surface area can raise the density of Cu-Px active sites, facilitate the mass transmission and further boost the electrocatalytic activity of Cu-P-C catalyst...
August 22, 2018: Chemistry, An Asian Journal
Isabel Del Hierro, Santiago Gómez-Ruiz, Yolanda Pérez, Paula Cruz, Sanjiv Prashar, Mariano Fajardo
The immobilization of two titanocene complexes on SBA-15 has been accomplished following post-synthetic procedures. The ionic liquid, 1-methyl-3-[(triethoxysilyl)propyl]imidazolium chloride, has also been incorporated into the titanium containing materials to determine its influence on the interaction with molecules of biological interest. Cyclic voltammetry has been used to study the influence of the ionic liquid on the mechanism of reduction of titanocene derivatives. The interaction of titanocene and titanocene/ionic liquid-containing mesoporous silica SBA-15 materials, with molecules of biological interest associated with important processes of metallodrug action against cancer cells, has been studied...
September 25, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
K Anjali, M Ahmed, J Christopher, A Sakthivel
Rhodium containing macromolecules calix[4]pyrrole (RhCP) and tetraphenyl porphyrin (RhTPP) were prepared and grafted on the surface of functionalised molecular sieve materials. 1H and 13C NMR, CHNS and mass spectral analyses were used for the structural elucidation of homogeneous organometallic complexes.1H NMR and CHNS analyses confirm the formation of calix[4]pyrrole (CP) and tetraphenyl porphyrin (TPP). The introduction of rhodium ions into the macromolecule is well evident from the disappearance of the 1H NMR signal characteristic of N-H proton (7...
September 11, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Diana Díaz-García, Diana Cenariu, Yolanda Pérez, Paula Cruz, Isabel Del Hierro, Sanjiv Prashar, Eva Fischer-Fodor, Santiago Gómez-Ruiz
The mesoporous silica-based material SBA-15 (Santa Barbara Amorphous-15) has been modified with the aminodiol ligand 3-[bis(2-hydroxyethyl)amino]propyltriethoxysilane (PADOH) to give the corresponding material SBA-PADOH. Subsequent functionalization with a diorganotin(iv) compound, SnPh2Cl2 (1), and with two titanocene derivatives, TiCp2Cl2 ([Ti(η5-C5H5)2Cl2] (2)) and TiCpCpPhNfCl2 ([Ti(η5-C5H5)(η5-C5H4CHPhNf)Cl2] (3) (Ph = C6H5; Nf = C10H7)), gave the materials SBA-PADO-SnPh2 (M1), SBA-PADO-TiCp2 (M2) and SBA-PADO-TiCpCp* (M3), respectively...
September 11, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Xuelei Pang, Li Li, Yi Wei, Xudong Yu, Yajuan Li
Two novel luminescent organic-inorganic hybrid materials, Ln(L-SBA15)3phen (Ln = Eu, Tb), were designed and synthesized. The organic ligand phenylurea was modified by the silane coupling agent 3-(triethoxysilyl)propyl isocyanate (TESPIC) to form a precursor (L), which was covalently bonded onto a mesoporous SBA-15 backbone to form mesoporous L-SBA15 through co-hydrolysis and co-condensation reactions. 1,10-Phenanthroline monohydrate (phen) was selected as the second ligand to improve the luminescence of the final products, and the two mesoporous hybrid materials Ln(L-SBA15)3phen were obtained after the coordination reaction between the organic ligands (phen and L-SBA15) and Ln(iii) ions...
August 21, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Andi Bai, Chao Wu, Xuan Liu, Huiling Lv, Xiaoyan Xu, Yue Cao, Wenjing Shang, Lili Hu, Ying Liu
Background: Biopharmaceutics classification system class II drugs have low solubility, which limits their extent and speed of absorption after oral administration. Over the years, mesoporous materials have been widely used to increase the dissolution rate and oral relative bioavailability of poorly water-soluble drugs. Objectives: In order to improve the dissolution rate and increase oral relative bioavailability of the poorly water-soluble drugs, a tin oxide carrier (MSn) with a mesoporous structure was successfully synthesized...
2018: Drug Design, Development and Therapy
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