Ni/AC-Al2O3催化CH4-CO2重整反应实验研究

Experimental study on CH4-CO2 reforming reaction catalyzed by Ni/AC-Al2O3

以拟薄水铝石为原料制备了Al2O3,以活性炭(AC)和拟薄水铝石为原料采用机械混合法制备了AC-Al2O3,然后分别以Al2O3和AC-Al2O3为载体通过等体积浸渍法制备镍基催化剂。通过利用TG、BET、SEM对催化剂进行表征和在固定床反应装置上考察催化剂催化活性,研究了掺杂活性炭对催化剂活性的影响。结果表明:未掺杂活性炭的催化剂5Ni/Al2O3,CH4转化率为62.3%,CO2转化率为78.8%;未还原的掺杂活性炭的催化剂5NiO/AC-Al2O3,CH4转化率为72.4%,CO2转化率为84.8%;还原的掺杂活性炭的催化剂5Ni/AC-Al2O3,CH4转化率为78.3%,CO2转化率为88.7%。由此可知,掺杂在载体中的活性炭可以将NiO还原为单质Ni,活性炭的加入可以改善催化剂的催化活性。

Al2O3 was prepared from pseudo-boehmite. AC-Al2O3 was prepared by mechanical mixing with activated carbon(AC)and pseudo-boehmite. Nickel-based catalysts were prepared by incipient wetness impregnation with Al2O3 and AC-Al2O3 as supports,respectively. The catalysts were characterized by TG, BET and SEM, and their catalytic activities were investigated in a fixed bed reactor. The effect of doped AC on the catalytic activity was studied. The results showed that the conversions of CH4 and CO2 were 62.3% and 78.8%, respectively, for the catalyst 5Ni/Al2O3 undoped with AC, 72.4% and 84.8% for the unreduced catalyst 5 NiO/ACAl2O3 doped with AC, respectively, and 78.3% and 88.7% for the reductive catalyst 5Ni/AC-Al2O3 doped with AC, respectively. It can be concluded that the AC doped in the support can reduce NiO to Ni, and the addition of AC can improve the catalytic activity of the catalyst.