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采用浸渍法制备了SiO2,γ-Al2O3,CaO和TiO2负载的Ni催化剂,以及不同MgO含量的MgO-7.5%Ni/γ-Al2O3催化剂,利用X射线衍射和N2吸附-脱附技术表征了催化剂的结构,在固定床反应器上评价了它们在稻草水蒸气催化重整制合成气反应中的催化性能,考察了反应条件对催化剂性能的影响.结果表明,以γ-Al2O3为载体时Ni催化剂活性最高,其中7.5%Ni/γ-Al2O3催化剂的H2收率可达1071.3ml/g,H2:CO的体积比为1.4:1;同时,MgO的添加进一步提高了该催化剂的性能,当MgO含量为1.0%时,H2收率可达1194.6ml/g,H2:CO体积比可达3.9:1.可见MgO的加入促进了Ni基催化剂上稻草水蒸气催化重整制合成气反应的进行,同时使得合成气中CO发生水-汽转换反应,从而大大提高了合成气中H2含量.
The Ni catalysts supported on SiO2, γ-Al2O3, CaO and TiO2 and the MgO-7.5% Ni / γ-Al2O3 catalysts with different MgO contents were prepared by impregnation method. The catalysts were characterized by X-ray diffraction and N2 adsorption-desorption Structure, and their catalytic performance in the catalytic reforming of straw water vapor to syngas was evaluated on a fixed-bed reactor.The effects of reaction conditions on the performance of the catalyst were investigated.The results showed that the activity of Ni catalyst with γ-Al2O3 as support The highest yield of H2 / CO over 7.5% Ni / γ-Al2O3 catalyst was 1071.3 ml / g and the volume ratio of H2: CO was 1.4: 1. The addition of MgO further enhanced the performance of the catalyst. When the MgO content was 1.0%, the yield of H2 can reach 1194.6ml / g and the volume ratio of H2: CO can reach 3.9: 1. It can be seen that the addition of MgO promotes the catalytic reforming of syngas by straw steam over Ni-based catalyst, The synthesis of CO gas-water vapor shift reaction, thereby greatly increasing the synthesis gas H2 content.