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Dissertations / Theses on the topic 'Al-MCM-41 mesoporous molecular sieves'

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Published: 4 June 2021

Last updated: 1 February 2022

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1

MEDEIROS, Cláudia Dourado. "Desenvolvimento de Peneiras Moleculares MCM-41 E Al-MCM-41, via processo hidrotermal assistido por micro-ondas." Universidade Federal de Campina Grande, 2014. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/527.

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Submitted by Johnny Rodrigues (johnnyrodrigues@ufcg.edu.br) on 2018-04-30T16:37:00Z No. of bitstreams: 1 CLÁUDIA DOURADO MEDEIROS - DISSERTAÇÃO PPGEQ 2014..pdf: 1542895 bytes, checksum: 5a74f0ba9e6514c2859c363f528e0b6f (MD5)<br>Made available in DSpace on 2018-04-30T16:37:00Z (GMT). No. of bitstreams: 1 CLÁUDIA DOURADO MEDEIROS - DISSERTAÇÃO PPGEQ 2014..pdf: 1542895 bytes, checksum: 5a74f0ba9e6514c2859c363f528e0b6f (MD5) Previous issue date: 2014-04-02<br>Capes<br>As peneiras moleculares mesoporosas possuem um arranjo hexagonal de mesoporos com diâmetros de poros que variam de 2 a 10 nm

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Nalbant, Asli. "Synthesis And Characterization Of Cu-mcm-41 And Ni-mcm-41 Type Catalytic Materials." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/3/12605788/index.pdf.

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Discovery of mesoporous materials by Mobil researchers in 1992 opened a new field in catalytic applications. The materials designated as M41S family are MCM-41 with one-dimensional hexagonal structure, MCM-48 with three-dimensional cubic structure and MCM-51 with unstable lamellar structure. This family of materials have high surface areas up to 1500 m2/g, narrow pore size distributions with pore sizes varying from 20 to 100 &Aring<br>. These materials can be activated by incorporation of metals or active compounds into their structures. In this study, copper and nickel incorporated MCM-41 typ

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Yiu, Humphrey Hak Ping. "The application of MCM-41 type mesoporous molecular sieves as heterogeneous acid catalysts and catalyst supports." Thesis, University of Huddersfield, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285629.

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Two types of mesoporous molecular sieves, MCM-41 and MMS, were prepared, fully characterised and tested as solid acid catalysts and catalyst support materials. Three different methods for characterising the surface acidity of these solid acids were examined and compared. These methods were 1. Fourier Transform infrared (FTIR) spectroscopy of adsorbed pyridine, 2. Pulsed ammonia adsorption using a combination of thermogravimetry and differential scanning calorimetry (TG/DSC), and 3. Temperature-programmed desorption of amines. The acidity results of these molecular sieves were compared with zeo

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Oliveira, Thiago Gallo de. "Desenvolvimento de peneiras moleculares mesoporosas do tipo MCM-41 e MCM-48 impregnadas com aminas para utilização na adsorção de CO2." Universidade Federal de Sergipe, 2012. https://ri.ufs.br/handle/riufs/6040.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>The significant increase of carbon dioxide emissions in the atmosphere comes intensifying the global warming. The search for energetic source that turn emission down is of great importance, as well as the use of complementary actions like dioxide carbon capture process of the main emissions sources. From among some processes already very well-known industrially highlights chemical absorption with alkanolamine, which shows some disadvantages in being costly and generate waste derived from recovery. The use gas-solid selective in c

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Sun, Bo. "Understanding and Modifying TiO₂ for Aqueous Organic Photodegradation." Cincinnati, Ohio : University of Cincinnati, 2005. http://www.ohiolink.edu/etd/view.cgi?acc%5Fnum=ucin112361662.

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Thesis (Ph. D.)--University of Cincinnati, 2005.<br>Title from electronic thesis title page (viewed Apr. 12, 2006). Includes abstract. Keywords: band structure; charge separation; 4-chlorophenol; CrO3; deactivation; Degussa P25; Electrospinning; environment decontamination.; Fibers; MCM-41; MCM-48; Mesoporous Molecular Sieves; oxidation state; photocatalysis; platinum; quantum efficiency; reactivation; reduction; SBA-15; surface modification; synergism; synergy; TiO2; titania; Titanium Dioxide; total carbon removal.; total organic carbon; TPR; Transition metals; visible light; UV-light; UV-Vis

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Costa, Maria Jos? Fonseca. "S?ntese e caracteriza??o de materiais nanoporosos para pir?lise catal?tica de ?leos pesados." Universidade Federal do Rio Grande do Norte, 2008. http://repositorio.ufrn.br:8080/jspui/handle/123456789/17609.

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Made available in DSpace on 2014-12-17T15:41:45Z (GMT). No. of bitstreams: 1 MariaJFCpdf.pdf: 4931245 bytes, checksum: 45a7ea893d17f478c73adf56787579aa (MD5) Previous issue date: 2008-12-22<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior<br>The present work reports the study of nanoporous structures, aiming at their use in research directed to the current demand of the petroleum industry to value heavy oil. Initially, two ways were chosen for the synthesis of porous structures from the molecular sieves of type Si-MCM-41. In the first way, the structure MCM-41 is precursory for

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La, Salvia Nathália 1985. "Síntese e caracterização de MCM-41 impregnada com magnésio e cromo e suas propriedades catalíticas para reações de conversão de etanol." [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/266085.

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Orientador: Gustavo Paim Valença<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Química<br>Made available in DSpace on 2018-08-24T23:01:25Z (GMT). No. of bitstreams: 1 LaSalvia_Nathalia_D.pdf: 7860896 bytes, checksum: 356f0e957d83d2daaba9cb36b26a4056 (MD5) Previous issue date: 2014<br>Resumo: Peneiras moleculares do tipo MCM-41 foram sintetizadas com e sem alumínio estrutural e impregnadas com 5% de magnésio e 5 e 10% de cromo. As amostras foram então calcinadas e caracterizadas, e utilizadas na conversão catalítica de etanol. Esses materiais foram caracteri

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Barbosa, Marcela Nascimento. "S?ntese, caracteriza??o e aplica??o de MCM-41 funcionalizado com diisopropilamina no processo de adsor??o do di?xido de carbono." Universidade Federal do Rio Grande do Norte, 2009. http://repositorio.ufrn.br:8080/jspui/handle/123456789/17608.

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Made available in DSpace on 2014-12-17T15:41:45Z (GMT). No. of bitstreams: 1 MarcelaNBpdf.pdf: 2700913 bytes, checksum: 95100e939e95f8047d0ef3d50eb366ab (MD5) Previous issue date: 2009-08-12<br>Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico<br>Emissions of CO2 in the atmosphere have increased successively by various mechanisms caused by human action, especially as fossil fuel combustion and industrial chemical processes. This leads to the increase in average temperature in the atmosphere, which we call global warming. The search for new technologies to minimize environmental i

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Pereira, Francisco de Assis Rodrigues. "Síntese, caracterização e avaliação catalítica do aluminossilicato mesoestruturado AI-MCM-41 na transesterificação de óleos vegetais." Universidade Federal da Paraíba, 2010. http://tede.biblioteca.ufpb.br:8080/handle/tede/7165.

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Made available in DSpace on 2015-05-14T13:21:44Z (GMT). No. of bitstreams: 1 parte1.pdf: 1266396 bytes, checksum: a4c7a57bd0fd6230873b3e69c5c52c4f (MD5) Previous issue date: 2010-12-01<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>Molecular sieves have been applied to the processing of triacylglycerols, to produce biofuels. In this context, the mesoporous catalyst Al-MCM-41 was proposed in this work as an alternative to acid heterogeneous transesterification of cottonseed oil with ethanol. This material was prepared using various Si/Al molar ratios (25, 50,

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Daniel, Christopher John. "The use of novel mesoporous molecular sieve MCM-41 for the sorption and separation of neutral and overbased sulphonate and phenate lubricant detergents." Thesis, De Montfort University, 2003. http://hdl.handle.net/2086/10765.

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An area of industry that exploits zeolites for separation purposes is that of the petroleum industry where zeolites are used in catalytic conversions as well as chromatographic separations of hydrocarbons. The development of large pore sized materials such as MCM-41 enables larger molecules to be separated by the process of size exclusion than by traditional zeolites. In this work, mesoporous materials were synthesised and characterised using powder x-ray diffraction and nitrogen surface studies and shown to have different pore sizes in the region of 2 nm to 6 nm. They were then compared to tr

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Chen, Chih-Wei, and 陳志煒. "V-containing Mesoporous Molecular Sieves MCM-41: Synthesis, Characterization and Catalytic Oxidation." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/69458816322540730980.

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碩士<br>東海大學<br>化學系<br>90<br>Two types of vanadium-containing MCM-41 were synthesized via direct hydrothermal (V-MCM-41) and impregnation (V/MCM-41) methods. The catalysts were characterized by ICP-AES, XRD, N2-sorption, high temperature oxygen chemisorption (HTOC) measurements, 29Si and 51V NMR, TPR of H2, TPD of NH3 and FTIR techniques. The powder XRD patterns of all calcined samples exhibit characteristic MCM-41 structure. The 29Si NMR spectra of the calcined V-MCM-41 samples reveal similar patterns. Based on 51V NMR results, calcination followed by hydration in the air results in the transfo

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Shieh, Dong-Lin, and 謝東陵. "Catalytic reaction of citronellal over zeolites and MCM-41 mesoporous molecular sieves." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/82983752065771324301.

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碩士<br>東海大學<br>化學系<br>89<br>Abstract Isopulegol (IPG) is an important intermediate for the synthesis of menthol, a raw material for the manufacture of pharmaceuticals, perfumery and flavors. The catalysts were characterized by the methods of XRD, BET surface area measurement, 27Al and 29Si MAS-NMR and TPD of ammonia. Increasing SiO2/Al2O3 mol ratio of MCM-41 catalysts results in the enhancement of both crystalinity and surface area with concomitant decrease of acid amount. Dealumination occurs after calcinations of Al-MCM-41. For zeolites, an increase of SiO2/Al2O3 mol ratio causes t

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Chou, Shu-Hsien, and 周書賢. "Synthesis and characterization of mesoporous molecular sieves MCM-41 with high hydrothermal stability." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/94445524831451515786.

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碩士<br>中原大學<br>化學研究所<br>91<br>These studies suggest that wall thickness of siliceous MCM-41 can be controlled systematically up to 36.1 Å simply under mild TMAOH concentration at 165℃ for 1 to 7 days. MCM-41 with the wall thickness of 36.1 Å prepared at 165℃ for 7 days shows outstanding hydrothermal stability. M-165-7d after 7 days of hydrothermal treatment at 100℃ reserves 62﹪of (100) X-ray peak intensity and 90﹪of surface area compared to original M-165-7d. After further hydrothermal treatment for one week, M-165-7d-14d still has 52﹪of (100) X-ray peak intensity and 90﹪of surface area. It de

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14

許振宏. "Catalytic hydrogenation of trans, trans, cis-1, 5, 9-cyclododecatriene over Ni/MCM-41 mesoporous molecular sieves." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/96277131532165785402.

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碩士<br>東海大學<br>化學系<br>91<br>The catalytic reaction between trans, trans, cis- 1, 5, 9- cyclododecatriene and hydrogen gas has been studied using nickel containing mesoporous molecular sieve MCM-41. The catalysts of Ni/Si-MCM-41 and Ni/Al-MCM-41 were characterized with various techniques of XRD, TEM, gas sorption analyzer, NH3-TPD, H2-TPR, solid state NMR, CO-chemisorption and FT-IR to obtain the catalyst properties, viz. the structure, the surface area, the acidity, the reducibility and the metal dispersion. Increasing the SiO2/Al2O3 mol ratio enhances the structural order and the surface area

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CHEN, LI-WEN, та 陳立文. "EFFECTIVE SYNTHESIS OF β- NAPHTHYL METHYL ETHER FROM β- NAPHTHOL AND METHANOL USING MESOPOROUS MOLECULAR SIEVE Al-MCM-41". Thesis, 1998. http://ndltd.ncl.edu.tw/handle/09496149326557314597.

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劉世淼. "Pore size engineering in the mesoporous Molecular sieve MCM-41." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/29800503224295949069.

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碩士<br>中原大學<br>化學系<br>88<br>Abstract Mesoporous molecular sieves MCM-41 were synthesized by using the micelles of the quaternary ammonium ion with long organic chains as a template in stead of a single molecule. Physical and chemical properties of purely siliceous and aluminosilicate mesoporous molecular sieves MCM-41 were characterized by the 27Al solid state nuclear magnetic resonance (NMR), powder X-ray diffraction, inductively-coupled plasma atomic emission spectroscopy (ICP) and nitrogen adsorption. Three parts were investigated and included in this thesis. In t

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17

Tsai, Chia Lung, and 蔡佳龍. "Synthesis of Novel Molecular Sieves and Studies on Catalytic Oxidation of Trimethylphenol over Cu,Al-MCM-41." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/11713136081488482950.

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