Ethanol dehydrogenation over copper supported on carbon macrofibers

Ethanol Dehydrogenation: A Reaction Path Study by Means of Temporal Analysis of Products

“…Many research groups have found Cu catalysts to be highly active for ethanol dehydrogenation, revealing selectivities towards acetaldehyde of almost 100% in some cases [16][17][18][19][20][21][22][23][24][25]. A positive effect is reported when the Cu content increased in the range of 1-5 wt % [26].…”

“…The last set of TAP experiments concerning ethanol dehydrogenation presented in this paper deals with the catalytic behavior of a Cu/C catalyst. Based on literature findings that Cu catalysts are distinguished by high selectivities towards acetaldehyde [16,18,20,22,24,26], it was assumed that using Cu might lead to a divergent reaction scheme. In this respect, Figure 10a presents the Ar-normalized transient responses to pulses of ethanol in Ar at temperatures between 100 • C and 250 • C on the Cu/C catalyst at an m/z-value of 31, representing ethanol.…”

Sol-Gel Synthesis and Characterization of the Cu-Mg-O System for Chemical Looping Application

“…If the bulk copper undergoes melting at the temperature of 1083 • C, then the copper particles of 20 nm in size should start to melt at ~1000 • C. Further decrease in particle size to 10 and 5 nm is expected to result in the melting temperature values of ~750 and ~500 • C. Therefore, an approaching of the process temperature to the expected melting temperature should lead to a noticeable increase in the lability of copper species and their agglomeration into the thermodynamically favorable large particles. In order to solve the mentioned problem, copper and its oxide are deposited on various supports, and the metal-support interactions play the key roles here, providing the long-term stability of the supported copper species during the catalyst exploitation [1,9,30,[32][33][34][43][44][45].…”

“…Titanium oxide is less thermally stable; however, it provides the chemical stability of the copper catalysts towards poisoning [51][52][53]. Oppositely, carbonaceous supports possess high thermal stability and attractive mechanical and catalytic properties [30,32,[54][55][56].…”

“…In these cases, the main advantages of using copper as an active component are its low cost if compared with precious metals, high dispersity of copper species, and their strong interaction with the support that allows tuning the catalytic properties. Besides the mentioned applications, copper-based catalysts are highly efficient in the processes of total and partial (selective) oxidation [ 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ], hydrogenation [ 26 , 27 , 28 , 29 ], dehydrogenation of alcohols [ 30 , 31 , 32 , 33 ], reduction of nitrogen oxides [ 34 , 35 ], etc.…”