High‐performance HTLcs‐derived CuZnAl catalysts for hydrogen production via methanol steam reforming

Abstract

A series of CuZnAl oxide-composite catalysts were prepared via decomposition of CuZnAl hydrotalcite-like compounds (HTLcs). The catalysts derived from CuZnAl HTLcs (Cu: 37%, Zn: 15%, Al: 48% mol; using metal nitrate or acetate precursors) at 600 C provided excellent activity and stability for the methanol steam reforming. CuZnAl HTLcs were almost decomposed completely at 600 C to form highly dispersed CuO with large specific surface area while forming CuAl 2 O 4 spinel that played a key role in separating and stabilizing the nano-sized Cu and ZnO during the reaction. The CuZnAl catalyst prepared from metal acetates could highly convert H 2 O/MeOH (1.3/1, mol/mol) mixture into hydrogen with only $0.05% CO at 250 C or $0.005% at 210 C. It is evidenced that the former afforded stronger Cu-ZnO interaction, which might be the intrinsic reason for the significant promotion of catalyst selectivity.

Cu-Zn-Al-O catalysts for the oxidative desulfurization of dibenzothiophene, a typical sulfur-containing compound of the diesel fraction

“…2. Crystalline copper oxide is reduced in one step with a hydrogen uptake maximum at 285°C, which is in good agreement with the literature [20,21]. In contrast to the general con ception of the high temperature reduction of crystalline CuAl 2 O 4 spinel [18], the finely dispersed CuAl 2 O 4 spinel is reduced with hydrogen at quite low tempera tures, namely, at temperatures close to the reduction temperatureof crystalline CuO [20].…”

Enhanced oxygen mobility and reactivity for ethanol steam reforming

“…3 Increasing interests in developing hydrogen fuel cells spur investigations on understanding physicochemical properties of ethanol steam reforming (ESR) catalysts. The ESR catalysts mainly include supported base-metals (e.g., Ni, Co, Cu) [4][5][6][7] and supported noble metals (e.g., Pt, Rh, Ru, Pd, and Ir) [8][9][10][11] . Although noble metal-based catalysts show outstanding activity and stability in ESR, 12,13 their largescale application is limited primarily due to the high cost.…”

Microstructured Al‐fiber@meso‐Al2O3@Fe‐Mn‐K Fischer–Tropsch catalyst for lower olefins

“…The effluent gas was quantitatively analyzed on-line using an Agilent 7820 gas chromatography (GC) with thermal conductivity detector (TCD) and Shimadzu-2014C GC with HP-PLOT/Q capillary column and flame ionization detector (FID). The CO conversion (%) was calculated by the N 2 internal standard method according to the following equation 33 …”