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Mössbauer and magnetic studies of iron-zeolite and iron-cobalt zeolite catalysts used in synthesis gas conversion
, Article International Journal of Engineering, Transactions B: Applications ; Volume 20, Issue 3 , 2007 , Pages 263-274 ; 1728-144X (ISSN) ; Lo, C ; Sharif University of Technology
Materials and Energy Research Center
2007
Abstract
Medium-pore (diameter - 6A) zeolites such as ZSM-5 and silicalite impregnated with Group VIII metals provide selective catalytic pathways for the conversion of synthesis gas to gasoline or olefins. Mössbauer and magnetic studies on these catalysts containing iron or iron plus cobalt are reported. The zeolites were impregnated with metal nitrate solutions, reduced, and carbided to yield showed Fe3+ type spectra. The ZSM-5 (14.7 % Fe) and Silicalite (13.6 % Fe) samples exposed to H2 (450 C) showed an approximate 85% reduction to the metallic state. The carbided ZSM-5 (14.7 % Fe) revealed a spectrum of Hagg carbide (Fe5C2), an active component of the catalyst. The used catalysts showed mixtures...
Fabrication and microwave dielectric characterization of cordierite/BZBS (Bi2O3-ZnO-B2O3-SiO2) glass composites for LTCC applications
, Article Journal of Alloys and Compounds ; Volume 882 , 2021 ; 09258388 (ISSN) ; Nemati, A ; Banijamali, S ; Sharif University of Technology
Elsevier Ltd
2021
Abstract
The present work aims to fabricate cordierite/BZBS glass (Bi2O3-ZnO-B2O3-SiO2) composites through one-step heat treatment. Cordierite was synthesized from a solid-state reaction of aluminum hydroxide, magnesium hydroxide, and silica gel. BZBS glass was obtained through the classic melt quenching technique. Milled cordierite powder was mixed with different volume fractions of glass powders and heat treated at 950 °C. Considering the densification behavior along with the microwave dielectric features, two composites (C70G30 and C60G40) were chosen for further examination. These composites were separately heat treated at different temperatures from 650 up to 900 °C, then characterized due to...
Mutual information map as a new way for exploring the independence of chemically meaningful solutions in two-component analytical data
, Article Analytica Chimica Acta ; Volume 1227 , 2022 ; 00032670 (ISSN) ; Abdollahi, H ; Tauler, R ; Rukebusch, C ; Parastar, H ; Sharif University of Technology
Elsevier B.V
2022
Abstract
In the present contribution, a new approach based on mutual information (MI) is proposed for exploring the independence of feasible solutions in two component systems. Investigating how independent are different feasible solutions can be a way to bridge the gap between independent component analysis (ICA) and multivariate curve resolution (MCR) approaches and, to the best of our knowledge, has not been investigated before. For this purpose, different chromatographic and hyperspectral imaging (HSI) datasets were simulated, considering different noise levels and different degrees of overlap for two-component systems. Feasible solutions were then calculated by both grid search (GS) and...