Home | My Profile | Contact Us
Research Trends Products  |   order gateway  |   author gateway  |   editor gateway  
ID:
Password:
Register | Forgot Password

Author Resources
 Author Gateway
 Article submission guidelines

Editor Resources
 Editor/Referee Gateway

Agents/Distributors
 Regional Subscription Agents/Distributors
 
Current Topics in Catalysis   Volumes    Volume 6 
Abstract
Sample Controlled Temperature (SCT): a new method for the synthesis and characterization of catalysts
L. A. Pérez-Maqueda, P. E. Sánchez-Jiménez, J. M. Criado
Pages: 1 - 17
Number of pages: 17
Current Topics in Catalysis
Volume 6 

Copyright © 2007 Research Trends. All rights reserved

ABSTRACT
 
The method of Sample Controlled Temperature (SCT) implies to control the temperature in such a way that the reaction rate follows a trend previously selected by the user. In the most common SCT method, the reaction rate is maintained constant all over the process. This control is achieved by means of a feedback system using an experimental signal (digital or analogical output) directly proportional to the reaction rate. This signal is used for controlling the temperature in such a way that the reaction rate remains constant all over the process at a value previously selected by the user. Experiments could be performed under vacuum, where the output signal of the pressure gauge (Penning, Pirani or Mass spectrometer) is used as monitoring signal and by means of a proper control of the pumping rate it is possible to independently select both a constant reaction rate and a constant residual pressure in the close vicinity of the sample. Additionally, it can work under flow of gases using chatarometers, IR detectors, electrochemical sensors, etc, to monitor the evolution of the reaction. This method has been successfully applied to the design of materials with controlled texture and structure. Thus, catalyst and catalyst related materials with tailored shape and porosity has been prepared from the thermal transformation of precursors under controlled reaction rate and partial pressure of the gases generated in the reaction. Moreover, the SCT method present significant advantages over the conventional procedures for the characterization of thermal desorption and redox reactions of catalysts. The literature on the applications of SCT method to both the synthesis of catalysts with controlled texture and structure and the characterization of catalysts is reviewed. Advantages of the SCT methods for performing kinetic analysis of solid-state reactions of interest in catalysis are also discussed.
Buy this Article


 
search


E-Commerce
Buy this article
Buy this volume
Subscribe to this title
Shopping Cart

Quick Links
Login
Search Products
Browse in Alphabetical Order : Journals
Series/Books
Browse by Subject Classification : Journals
Series/Books

Miscellaneous
Ordering Information Ordering Information
Downloadable forms Downloadable Forms