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Author Topic: Influence of temperature on effectiveness of alumina-supported catalysts  (Read 7640 times)

Offline blahblabla

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"Alumina supported Rh-LaCoO3 has been investigated for the catalytic conversion of tar produced by biomass pyrolysis into hydrogen-rich gas."
- newbielink:http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4W1SRVH-1&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&_docanchor=&view=c&_searchStrId=1109293371&_rerunOrigin=google&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=1c0386a772718f442567976a5f3783d2 [nonactive]

"The best performing catalysts have consisted of nickel and magnesium supported on fluidizable alumina. "
- newbielink:http://aiche.confex.com/aiche/2008/techprogram/P131740.HTM [nonactive]

Now, the questions are:
Would alleviated temperatures, in theory, improve the effectiveness of these catalysts?
Why are the catalysts "alumina-supported"?
What is the purpose of having "fluidizable" alumina?

All constructive replies are welcomed. Thanks in advance.

P.S. Excuse my poor English.


 

Offline khaly

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hiiiiiii,

The catalytic incineration of toluene over γ-Al2O3-supported transition-metal oxide catalysts in the temperature range of 200380 C was investigated employing a fixed bed flow reactor. CuO/γ-Al2O3 was found to be the most active of seven catalysts tested. Using this catalyst with different wt% Cu in the incineration of toluene, we found that the optimal Cu content was 5 wt%. X-ray diffraction, BET surface area and hydrogen-temperature-programmed reduction showed that it was mainly the formation of large CuO crystals that caused declines in catalyst activity at Cu content above 5 wt%. Addition of water vapor or CO2 inhibited catalyst activity, but this effect was reversible. Although coexistence of toluene and n-hexane resulted in a reduction in n-hexane conversion, the impact on toluene oxidation was only negligible. Temperature-programmed desorption revealed that this differential effect was due to more competitive adsorption of toluene onto active sites of the catalyst.
 

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