NDLI: The estimation of thermal endurance for some heteropoly acidic catalysts from thermogravimetric decomposition data

Content Provider	Springer Nature Link
Author	Sasca, Viorel Zoltan Verdeş, Orsina Popa, Alexandru
Copyright Year	2016
Abstract	The calculation of thermal endurance and the estimation of lifetime at certain temperatures based on thermogravimetric data for the tungstophosphoric acid, H$_{3}$[PW$_{12}$O$_{40}$]·H$_{2}$O (H$_{3}$PW) and its Cs acidic salts, pure or doped with Pd, were done. The calculation of catalyst’s lifetime with high degree of confidence needs reliable values for activation energy. For this reason, the activation energy values were calculated with ASTM E 1641-04 “Standard Test Method for Decomposition Kinetics by Thermogravimetry” based on Flynn–Wall isoconversional method and with Friedman isoconversional method (differential model-free) for checking, because the last provides accurate values of activation energies compared with the integral model-free methods. The thermal decomposition of the H$_{3}$PW and some of its acidic Cs salts, pure or doped with Pd, occurs through the constitutional water release [the water formed of the protons and the oxygen from the [PW$_{12}$O$_{40}$]$^{3−}$] having as result the loss of acid sites (protons) and its catalytic activity diminution at the same time. The activation energies are reliable values for the conversion range of 5 ≤ α ≤ 20, but the value for α = 10 % is recommended for the calculation of the lifetime. The estimation of lifetimes was done with ASTM E 1877-00 “Standard Practice for Calculating Thermal Endurance of Materials from Thermogravimetric Data” method. The estimated thermal life of the H$_{3}$PW and some of its acidic Cs salts pointed out a very good thermal endurance at temperatures below 573 K. The Pd doping decreases drastically the thermal endurance in all cases.
Starting Page	273
Ending Page	282
Page Count	10
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	127
Issue Number	1
e-ISSN	15882926
Language	English
Publisher	Springer Netherlands
Publisher Date	2016-04-27
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Tungstophosphoric acid Cesium acidic tungstophosphates Pd-doped heteropoly compounds TG/DTG–DTA analysis Activation energy Isoconversional methods Estimation of lifetime Physical Chemistry Analytical Chemistry Polymer Sciences Inorganic Chemistry Measurement Science and Instrumentation
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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