Partial oxidation of methanol to produce hydrogen over CuZn-based catalysts

Production of hydrogen from methanol over Cu/ZnO catalysts promoted by ZrO2 and Al2O3

“…The method is based on the one described by Alejo et al [22]. The catalysts are summarized in Table 1.…”

“…The O 2 pressure was maintained substoichiometric (O 2 / CH 3 OH = 0.2), as it has been shown that the loss of methanol and/or H 2 by combustion during POM is substantial under stoichiometric conditions (O 2 /CH 3 OH = 0.5) [22,24]:…”

“…In the calcined catalyst, CuO displays the characteristic peak at 934.3 eV [22,37,45,[48][49][50][51][52][53][54]. After exposure to H 2 , the peak shifts to 932.4 eV, indicative of Cu 0 formation [22,37,48,50,[52][53][54][55]]. The reduced sample was then exposed to O 2 /CH 3 OH.…”

“…The reduced sample was then exposed to O 2 /CH 3 OH. As the binding energies of Cu 0 and Cu + are not distinguishable on the basis of Cu2p 3/2 , the modified Auger parameters (α Cu ) were calculated in order to differentiate between these two species [22,48,50]. The Auger parameter of copper (α Cu ) shifted from 1850.8 to 1848.8 eV upon exposure to O 2 /CH 3 OH, which is characteristic of Cu + [22,50,56].…”

“…Recent papers have discussed the POM reaction [22][23][24], as well as the combined process for production of H 2 [25][26][27][28][29][30][31][32][33][34][35][36][37][38]. The Cu/ZnO/Al 2 O 3 catalyst, which is traditionally used for low-temperature gas-shift and methanol synthesis, has been widely used in these reactions.…”