PROX reaction of CO in H2/H2O/CO2 Water–Gas Shift (WGS) feedstocks over Cu–Mn/Al2O3 and Cu–Ni/Al2O3 catalysts for fuel cell applications

Promotional Effect of Gold on the WGS Activity of Alumina-Supported Copper-Manganese Mixed Oxides

“…This assignment is in harmony with the analysis of the EPR spectra about the co-existence of two different types of Cu 2+ sites due to the formation of isolated Cu(II) ions and agglomerated CuO. The higher temperature component (259 • C) should be related to the reduction of a highly dispersed Cu-Mn spinel phase of relatively small crystallite size [32]. Our TPR results are consistent with the observations of Li et al [33] who have studied CuMn( y )O x /γ-Al 2 O 3 of the same amount of active phase as in the present work (20 wt %) and have registered one TPR reduction peak up to 300 • C. Tanaka et al have also reported the reduction of Cu 1.5 Mn 1.5 O 4 in the temperature range of 300-500 • C depending on the preparation method [4].…”

“…Both EPR and HRTEM (SAED) techniques evidenced a nearly complete transformation of the spinel phase to MnO. According to the literature, the further reduction of MnO to Mn 0 has not occurred even up to 950 • C [32].…”

Heterogeneous Cu–Fe oxide catalysts for preferential CO oxidation (PROX) in H2-rich process streams

“…Similar to the CuO systems reported in the literature 45,[50][51][52] Cu composite systems presented in this work has shown high activity for CO oxidation, and the strong interaction between the two metal components is believed to be responsible for the high activity. In comparison to the other Cu-Fe based catalysts and Cu based catalysts for PROX reaction, reported in the literature, 15,19,45,47,53,59 CuFe 2 O 4 material exhibited high activity (Table 4). These catalysts showed an enhanced performance when compared to the analogues, consisting of Au and Pt (Table 4).…”

“…The degassed samples were analysed in the Micrometrics ASAP 2020 multi-point BET surface area analyser. The measured specic surface areas for the samples in crystallite forms were converted to equivalent particle size according to the following equation: [13][14][15] D BET ¼ 6000 dS BET D BET is the particle diameter in nm, d is the material density in g cm À3 , and S BET is the surface area in m 2 g À1 . Powder X-ray diffraction (XRD) studies were conducted using the PANalytical X'Pert Pro.…”

Preparação de catalisadores Pt/CeO2 via método de redução por álcool para a oxidação preferencial de monóxido de carbono em misturas ricas em hidrogênio (PROX-CO)

“…Todavia, as reações de shift não são eficientes para remoção completa do CO, restando na composição do hidrogênio um teor entre 0,5 % a 1 % deste contaminante, quantidade que não é tolerável para algumas de suas aplicações, como por exemplo, no processo de síntese de amônia, que exige teores de CO menores que 200 ppm (KRYLOVA et al, 1987) ou no caso de seu emprego em sistemas de células a combustível, cujos níveis de CO a depender do dispositivo, variam entre 10 e 100 ppm (UYSAL et al, 2006;HUANG, S. et al, 2009;KIM et al, 2010;LIU, K. et al, 2012;YU et al, 2012;BOKHOVEN et al, 2014;SAAVEDRA et al, 2016;EROPAK et al, 2017;LOU et al, 2017;DASIREDDY et al, 2018).…”