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The measurement of small amounts of coke by a sensitive TGA/FTIR technique (1998)

Li, Binghui ; Gonzalez, Richard D.

Springer

Catalysis letters 54 (1998), S. 5-8

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ISSN: 1572-879X

Keywords: carbon measurements ; coke ; FTIR ; TGA ; sulfated zirconia ; isomerization ; n‐butane

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Notes: Abstract A useful, high‐sensitivity method for quantifying small amounts of coke on a catalyst was developed. A TGA/FTIR technique was used. Gases evolved from the sample during the thermogravimetric analysis were transferred from the furnace by a purge gas to the flow cell of an FTIR. The intensity of the infrared spectra of evolved gases, such as CO2, was measured as a function of time and displayed as a chromatogram. Integration of the chromatograms was compared to that of a standard sample and gave the amount of coke deposited on the catalyst. The carbon deposition on sulfated sol–gel zirconia in the isomerization of n‐butane at 200°C was measured. The carbon content was 0.013 wt% following deactivation for 15 min and 0.06 wt% after 180 min.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1019055200591

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Catalytic and interfacial aspects of enzymatic polymer synthesis in reversed micellar systems (1993)

Rao, A. Madhusudhan ; John, Vijay T. ; Gonzalez, Richard D. ; [et al.]

New York, NY [u.a.] : Wiley-Blackwell

Biotechnology and Bioengineering 41 (1993), S. 531-540

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ISSN: 0006-3592

Keywords: horseradish peroxidase ; reversed micelles ; phenolic polymers ; enzyme kinetics ; Chemistry ; Biochemistry and Biotechnology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology

Notes: The enzyme horseradish peroxidase, when encapsulated in reversed micelles, is capable of catalyzing the synthesis of phenolic and aromatic amine polymers. The synthesis of polyethylphenol is specifically considered in this article and is found to be extremely feasible in the micellar system. Polymer chain growth can be controlled to some degree by manipulating the ability of the solvent to sustain chain solubility; this is effectively done by adjusting the surfactant concentration. This results in a degree of control of polymer molecular weight. The synthesized polymer drops out of solution and can be easily recovered. © 1993 John Wiley & Sons, Inc.

Additional Material: 11 Ill.