
By Edward Furimsky
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Extra info for Carbons and Carbon Supported Catalysts in Hydroprocessing
Example text
With respect to the catalytic activity of carbon alone, this makes the experimental results less conclusive. Moreover, the accuracy of the experimental data may be limited because of generally low conversions observed when carbons alone are used as catalysts. For the purpose of this review, the results from testing of carbon and conventional supports such as g-Al2O3 under identical conditions are of primary interest. 93 Under these conditions, no HDN reaction was observed, whereas some HDS of thiophene was evident.
2 A˚ of the Mo–C bond they concluded that the Mo–C coordination was restricted to the exposed Mo atoms and carbon atoms on AC. Such coordination was responsible for a high dispersion of MoS2 on carbon supports. It appears that in CoMo catalysts supported on carbon, a Co–C coordination may be present in addition to Mo–C coordination. 73 reported that freshly sulfided CoMoS and NiMoS phases had a tendency to coordinate with carbon, if available in their vicinity. If present, CUS facilitated such interaction.
On the other hand, much greater acidity of Al2O3 than AC could have been responsible for the earlier onset of coke deposition. 1 Model Feeds The information on the activity of various carbons for hydroprocessing reactions involving model compounds is usually part of the more comprehensive studies involving carbon-supported catalysts. In such studies, the activity of carbon is only determined as a baseline for investigating catalytic effects of the addition of metals to carbon support. With respect to the catalytic activity of carbon alone, this makes the experimental results less conclusive.
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