The preparation of a Cu-based sorbent supported by cost-effective AlOOH is proposed. A Cu-based sorbent for thiophene removal from coke oven gas was synthesized via coprecipitation, and the effect of AlOOH addition on the dispersion of activated Cu species and desulfurization properties was investigated. At an AlOOH content of 25%, smaller and more highly dispersed Cu grains, along with ZnO crystalline phases, were present on the surface of the Cu-based sorbent. The enhanced Cu-ZnO interaction contributed to the superior desulfurization performance (Qb-thiophene = 30.43 mg/g). The incorporation of an appropriate amount of AlOOH into the binary system during synthesis produces a highly active sorbent with superior Cu dispersion and smaller Cu grains, thereby fulfilling the requirements of industrial applications at a lower production cost.
Cu-based catalysts have been extensively used in the methanol steam reforming (MSR) reaction owing to low cost and high efficiency. In this work, we investigated the promotional effect of Fe on the Cu/ZnO/Al 2 O 3 catalysts prepared by an incipient-wetness impregnation method using a series of (quasi) in situ characterization techniques. The form of the Fe species was found to strongly depend on the Fe content. Fe species are present as highly dispersed FeO x in small amount of Fe with improved the dispersion of Cu. As Fe content increases, Fe species gradually transition to CuFe alloy and eventually to Fe 3 O 4 particles, leading to a decrease in Cu dispersion. With the gradual increase in Fe content, the apparent activity shows a volcanic trend, with CuAl-0.1Fe showing highest activity, whereas the intrinsic activity gradually decreases. Compared with CuAl- x Fe, adding moderate Fe to Cu/ZnO/Al 2 O 3 promotes the dispersion of Cu and Zn, forming abundant Cu-ZnO x interfacial sites, which improves both apparent and intrinsic activities. The best catalytic performance was obtained with the CuZnAl-0.1Fe catalyst, achieving the highest H 2 production rate of 134.7 mmol g cat −1 h −1 at 200 °C. This study reveals the role of Fe in Cu-based catalysts for MSR and inspires the design of improved Cu-based catalysts.
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