نتایج جستجو برای: structure zeolite

تعداد نتایج: 1575663  

Journal: :Molecules 2018
Stephanie Reuss Dirk Sanwald Marion Schülein Wilhelm Schwieger Shaeel A Al-Thabaiti Mohamed Mokhtar Sulaiman N Basahel

Layers of high silica zeolites, synthesized with an organic structure directing agent (OSDA) and grown onto porous support structures, frequently suffer from the thermal stress during the removal of OSDA via the calcination process. The different thermal expansion coefficients of the zeolite and the support material, especially when stainless steel is used as a support, causes enormous tension ...

2004
Xiongfu Zhang Haiou Liu King Lun Yeung Jinqu Wang

Zeolites are crystalline microporous materials with well-defined and uniform pore structure that find extensive industrial uses as adsorbents, catalysts and ion exchangers [1-2]. Zeolite films supported on different materials have been successfully prepared and have potential applications as highly selective membrane separators, membrane reactors, chemical sensor and microdevices [3-10]. Most o...

2011
Takahiko Moteki Yoichi Murakami Suguru Noda Shigeo Maruyama Tatsuya Okubo

RECEIVED DATE (to be automatically inserted after your manuscript is accepted if required according to the journal that you are submitting your paper to) Preparation of high-quality single-walled carbon nanotubes (SWNTs) has been advanced by controlling several parameters including the catalyst and the catalyst support material. Although zeolite has been frequently used as a catalyst support ma...

2013
Atheel Hassan Alwash Zuhairi Abdullah

Characteristics and sonocatalytic activity of zeolite Y catalysts loaded with TiO2 using impregnation and ion exchange methods for the degradation of amaranth dye were investigated. The Ion-exchange method was used to encapsulate the TiO2 into the internal pores of the zeolite while the incorporation of TiO2 mostly on the external surface of zeolite was carried out using the impregnation method...

Journal: :Molecules 2017
Hallah Ahmad Alyosef Hans Roggendorf Denise Schneider Alexandra Inayat Julia Welscher Wilhelm Schwieger Tom Münster Gert Kloess Suzan Ibrahim Dirk Enke

Pre-shaped mesoporous amorphous rice husk ash (RHA) and MCM-41 derived from RHA as a silica source were transformed into MFI-type zeolites using two different structure-directing agents. Tetrapropylammonium hydroxide (TPAOH) was utilized as an alkali source for silica dissolution and structure control during the direct transformation of RHA into zeolite. A monopropylamine (PA)-containing alkali...

Journal: :Molecular informatics 2010
M Lach-Hab S Yang I I Vaisman E Blaisten-Barojas

Informatics approaches play an increasingly important role in the design of new materials. In this work we apply unsupervised statistical learning for identifying four framework-type attractors of zeolite crystals in which several of the zeolite framework types are grouped together. Zeolites belonging to these super-classes manifest important topological, chemical and physical similarities. The...

Journal: :Chemistry 2015
Georgian Melinte Veselina Georgieva Marie-Anne Springuel-Huet Andreï Nossov Ovidiu Ersen Flavien Guenneau Antoine Gedeon Ana Palčić Krassimir N Bozhilov Cuong Pham-Huu Shilun Qiu Svetlana Mintova Valentin Valtchev

The principle aspects and constraints of the dynamics and kinetics of zeolite nucleation in hydrogel systems are analyzed on the basis of a model Na-rich aluminosilicate system. A detailed time-series EMT-type zeolite crystallization study in the model hydrogel system was performed to elucidate the topological and temporal aspects of zeolite nucleation. A comprehensive set of analytical tools a...

2013
Fevzi Köksal Fatih Ucun İbrahim Kartal

This study reports on the EPR of C r 5 + and C u 2 + ions, introduced by solidand liquid-state reactions with the synthetic zeolites 3A, 4A and 5A, and the natural zeolite clinoptilolite. C r 3 + was oxidized to Cr 5 + in the samples, the coordination around Cr 5 + being square pyramidal. Superhyperfine (shf) interaction of Cr with A1 nucleus was observed in both solidand liquid-stateintroduced...

2018
Frank C Hendriks Sajjad Mohammadian Zoran Ristanović Sam Kalirai Florian Meirer Eelco T C Vogt Pieter C A Bruijnincx Hans C Gerritsen Bert M Weckhuysen

Establishing structure-activity relationships in complex, hierarchically structured nanomaterials, such as fluid catalytic cracking (FCC) catalysts, requires characterization with complementary, correlated analysis techniques. An integrated setup has been developed to perform transmission electron microscopy (TEM) and single-molecule fluorescence (SMF) microscopy on such nanostructured samples....

Journal: :journal of nanostructures 2012
m. sadeghi m. h. hosseini

in this work, zeolite nay was prepared by hydrothermal method. then, silver ions were replaced in the zeolite nay with silver nitrate (agno3) solution via using ion exchange (ie) method. the manganese dioxide (mno2) nanoparticles (9.3 and 15.8 wt %) for guest were deposited in the zeolite agy(host) structure with mn(no3)2 aqueous and kmno4 solutions by confined space synthesis (css) method. syn...

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