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Effect of mesoporous nanocrystalline supports on the performance of the Ni–Cu catalysts in the high-temperature water-gas shift reaction
Journal of the Energy Institute ( IF 5.7 ) Pub Date : 2020-08-29 , DOI: 10.1016/j.joei.2020.08.006
Naeemeh Sadat Maboudi , Fereshteh Meshkani , Mehran Rezaei

Ni–Cu based catalysts supported on different nanocrystalline powders were prepared and investigated in the high-temperature water gas shift (HTWGS) reaction. The supports were synthesized via a simple solid-state method and the prepared support possessed a BET area in the range of 18.6–239.6 m2 g−1. The active metals (Ni and Cu) were deposited on the catalyst supports via the wet impregnation method. The effects of Ni and Cu loadings, calcination and reduction temperatures, GHSV, and steam/gas molar ratio on the catalytic performance of the catalysts were studied. The results indicated that 7 wt%Ni-7.5 wt%Cu/CeO2–Al2O3 catalyst showed higher CO conversion compared to the other prepared catalysts and also produced a low concentration of methane during the reaction. This catalyst also presented higher stability than 7 wt%Ni-12.5 wt% Cu/CeO2–Al2O3 at 400 °C under a high GHSV value (30,000 (mL. h−1. gcat−1)) during HTWGS reaction. It was found that the increment in Cu loading from 5 wt% to 7.5 wt% decreased the CO conversion about 5.61% at 450 °C but methane concentration decreased significantly from 5.95% to 2.65%. The formation of Ni–Cu alloy in nickel-based catalyst improved the selectivity toward HTWGS reaction.



中文翻译:

介孔纳米晶载体对高温水煤气变换反应中Ni-Cu催化剂性能的影响

制备了负载在不同纳米晶体粉末上的Ni-Cu基催化剂,并在高温水煤气变换(HTWGS)反应中进行了研究。通过简单的固态方法合成载体,制备的载体的BET范围为18.6-239.6 m 2  g -1。经由湿式浸渍法将活性金属(Ni和Cu)沉积在催化剂载体上。研究了镍和铜的负载量,煅烧和还原温度,GHSV以及蒸汽/气体摩尔比对催化剂催化性能的影响。结果表明:7wt%Ni-7.5 wt%Cu / CeO 2 –Al 2 O 3与其他制备的催化剂相比,该催化剂显示出更高的CO转化率,并且在反应过程中还产生了低浓度的甲烷。该催化剂也超过7重量%的Ni-12.5重量%Cu /呈现的CeO更高的稳定性2 -Al 2 ö 3在一较高下GHSV值400°C(30000(毫升的.h -1。g催化剂-1))期间HTWGS反应。发现在450℃下Cu负载量从5重量%增加到7.5重量%将CO转化率降低约5.61%,但是甲烷浓度从5.95%显着降低到2.65%。镍基催化剂中镍铜合金的形成提高了对HTWGS反应的选择性。

更新日期:2020-08-29
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