Efficient and rapid transformation of high silica CHA zeolite from FAU zeolite in the absence of water

2017 ◽  
Vol 5 (19) ◽  
pp. 9076-9080 ◽  
Author(s):  
Xin Xiong ◽  
Dingzhong Yuan ◽  
Qinming Wu ◽  
Fang Chen ◽  
Xiangju Meng ◽  
...  
Keyword(s):  
Zeolite Catalysts ◽  
High Quality ◽  
Fau Zeolite ◽  
High Silica ◽  
Rapid Transformation

High quality CHA zeolite catalysts were efficiently synthesized by fast transformation of FAU zeolite in the absence of water.

Catalytic performance of MoO3/FAU zeolite catalysts modified by Cu for reverse water gas shift reaction

2020 ◽  
Vol 592 ◽  
pp. 117415 ◽  
Author(s):  
Atsushi Okemoto ◽  
Makoto R. Harada ◽  
Takayuki Ishizaka ◽  
Norihito Hiyoshi ◽  
Koichi Sato
Keyword(s):  
Catalytic Performance ◽  
Zeolite Catalysts ◽  
Water Gas Shift ◽  
Water Gas Shift Reaction ◽  
Fau Zeolite ◽  
Reverse Water Gas Shift ◽  
Shift Reaction ◽  
Water Gas

Manufacturing of low-pour-point fuels using high-silica zeolite catalysts

2015 ◽  
Vol 55 (7) ◽  
pp. 557-562
Author(s):  
T. P. Kiseleva ◽  
M. I. Tselyutina ◽  
R. R. Aliev ◽  
S. A. Skornikova
Keyword(s):  
Pour Point ◽  
Zeolite Catalysts ◽  
High Silica

scholarly journals Characterization of bentonite clay from 'Greda' deposit

2011 ◽  
Vol 5 (2) ◽  
pp. 97-101 ◽  
Author(s):  
Nadezda Stankovic ◽  
Mihovil Logar ◽  
Jelena Lukovic ◽  
Jelena Pantic ◽  
Miljana Miljevic ◽  
...  
Keyword(s):  
Ceramic Industry ◽  
Bentonite Clay ◽  
Nitrogen Adsorption ◽  
Raw Material ◽  
X Ray Diffraction ◽  
High Quality ◽  
X Ray ◽  
High Silica ◽  
Representative Samples

Based on mineralogical and technological investigations of the deposit 'Greda' important characteristics of bentonite clay were determined. Representative samples of the deposit were characterized with X-ray diffraction, low-temperature nitrogen adsorption, chemical analysis, differential thermal analysis and scanning electron microscopy. It was determined that the main mineral is montmorillonite and in subordinate quantities kaolinite, quartz and pyrite. The chemical composition generally shows high silica and alumina contents in all samples and small quantities of Fe3+, Ca2+ and Mg2+ cations. Based on technological and mineralogical research, bentonite from this deposit is a high-quality raw material for use in the ceramic industry.

scholarly journals Catalytic conversion of 5-hydroxymethylfurfural (5-HMF) over Pd-Ru/FAU zeolite catalysts

2021 ◽  
Vol 360 ◽  
pp. 2-11
Author(s):  
Nathalia Ramírez Bocanegra ◽  
Javier Rivera De la Rosa ◽  
Carlos J. Lucio Ortiz ◽  
Pablo Cubillas González ◽  
Hugh Chris Greenwell ◽  
...  
Keyword(s):  
Catalytic Conversion ◽  
Zeolite Catalysts ◽  
Fau Zeolite

Beckmann rearrangement reaction: About the role of defect groups in high silica zeolite catalysts

2007 ◽  
Vol 101 (1-2) ◽  
pp. 153-160 ◽  
Author(s):  
B. Bonelli ◽  
L. Forni ◽  
A. Aloise ◽  
J.B. Nagy ◽  
G. Fornasari ◽  
...  
Keyword(s):  
Beckmann Rearrangement ◽  
Zeolite Catalysts ◽  
Defect Groups ◽  
Rearrangement Reaction ◽  
High Silica

Study on Improving of the Iron Concentrate Grade Index by Centrifuge

2014 ◽  
Vol 496-500 ◽  
pp. 512-515
Author(s):  
Zheng Peng Cai ◽  
Xiao Wang ◽  
Xiong Tong
Keyword(s):  
Optimum Condition ◽  
Experimental Studies ◽  
Pulp Density ◽  
Feed Speed ◽  
High Quality ◽  
Iron Concentrate ◽  
High Silica ◽  
Ferromagnetic Iron ◽  
Concentrate Grade ◽  
Grade Index

In this study, the main aims were to iron-increasing and silicon-reduction of the iron concentrate by using centrifuge separating technology. Experimental studies were carried out on high-silica ferromagnetic iron concentrate in Dahongshan samples, which contain 50% of iron and 15% silica. Through the experiment, it chooses SLon1600 to iron-increasing and silicon-reduction of the iron concentrate. The optimum condition is pulp density of 20%~25%, feed speed of 1.99t/h, rinse water of 6.4t/h and flushing water of 10.22t/h. The iron concentrate which the grade of Fe is 62.36% and the recovery of 80.47% is obtained and the grade of silica reduce from 14.48% to 5.4%. High-quality iron concentrate is obtained, which has a better effect.

scholarly journals Theoretical Studies on the Mechanism of deNOx Process in Cu–Zn Bimetallic System—Comparison of FAU and MFI Zeolites

Molecules ◽  
2022 ◽  
Vol 27 (1) ◽  
pp. 300
Author(s):  
Izabela Kurzydym ◽  
Izabela Czekaj
Keyword(s):  
Density Functional ◽  
Co Adsorption ◽  
Computer Calculation ◽  
Zeolite Catalysts ◽  
Hydroxyl Group ◽  
Hydroxyl Groups ◽  
Hydrothermal Conditions ◽  
Fau Zeolite ◽  
Cu Catalyst ◽  
Mfi Zeolites

In the present study we propose a more promising catalyst for the deNOx process to eliminate harmful nitrogen oxides from the environment. The study was performed with a computer calculation using density functional theory (DFT) based on an ab initio method. Two zeolite catalysts, FAU and MFI, were selected with additional Cu–O–Zn bimetallic dimer adsorbed inside the pores of both zeolites. Based on the analysis of preliminary studies, the most probable way of co-adsorption of nitric oxide and ammonia was selected, which became the initial configuration for the reaction mechanism. Two types of mechanisms were proposed: with hydroxyl groups on a bridged position of the dimer or a hydroxyl group on one of the metal atoms of the dimer. Based on the results, it was determined that the FAU zeolite with a bimetallic dimer and an OH group on the zinc atom was the most efficient configuration with a relatively low energy barrier. The real advantage of the Cu–Zn system over FAU and MFI in hydrothermal conditions has been demonstrated in comparison to a conventional Cu–Cu catalyst.

scholarly journals Evaluation of the Possibilities of Sodium Silicate Sands Application in Automated Hot-Box Process of Cores Shooting

2017 ◽  
Vol 17 (4) ◽  
pp. 155-160
Author(s):  
M. Stachowicz ◽  
K. Granat ◽  
P. Obuchowski
Keyword(s):  
Sodium Silicate ◽  
Bending Strength ◽  
Heating Temperature ◽  
Heating Time ◽  
Silica Matrix ◽  
Silica Sand ◽  
Operating Parameters ◽  
High Quality ◽  
High Silica ◽  
Preliminary Research

AbstractThe paper presents the results of preliminary research on the use of silica sands with hydrated sodium silicate 1.5% wt. of binder for the performance of eco-friendly casting cores in hot-box technology. To evaluate the feasibility of high quality casting cores performed by the use of this method, the tests were made with the use of a semiautomatic core shooter using the following operating parameters: initial shooting pressure of 6 bar, shot time 4 s and 2 s, core-box temperature 200, 250 and 300 °C and core heating time 30, 60, 90 and 150 s. Matrixes of the moulding sands were two types of high-silica sand: fine and medium. Moulding sand binder was a commercial, unmodified hydrated sodium silicate having a molar module SiO2/ Na2O of 2.5. In one shot of a core-shooter were made three longitudinal samples (cores) with a total volume of about 2.8 dm3. The samples thus obtained were subjected to an assessment of the effect of shooting parameters, i.e. shooting time, temperature and heating time, using the criteria: core-box fill rate, bending strength (RgU), apparent density and surface quality after hardening. The results of the trials on the use of sodium silicate moluding sands made it possible to further refine the conditions of next research into the improvement of inorganic warm-box / hot-box technology aimed at: reduction of heating temperature and shot time. It was found that the performance of the cores depends on the efficiency of the venting system, shooting time, filling level of a shooting chamber and grains of the silica matrix used.

Synthesis of High-silica CHA Zeolite from FAU Zeolite in the Presence of Benzyltrimethylammonium Hydroxide

2008 ◽  
Vol 37 (9) ◽  
pp. 908-909 ◽  
Author(s):  
Masaya Itakura ◽  
Takayuki Inoue ◽  
Atsushi Takahashi ◽  
Tadahiro Fujitani ◽  
Yasunori Oumi ◽  
...  
Keyword(s):  
Fau Zeolite ◽  
High Silica
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