CAJ | 학술논문

通过共沉淀法制备了Al、Zr和Ce改性的Cu-ZnO基低温甲醇合成催化剂,采用氮气物理吸附、H2-TPR、CO2-TPD、N2 O滴定、XRD和TEM等技术对其进行了表征,并考察了改性组分和煅烧温度对其在170℃下合成气制甲醇催化性能的影响。结果表明,经Zr改性的Cu-ZnO基催化剂,其低温甲醇合成性能较好；随着煅烧温度的降低,Cu在催化剂表面的分散度逐渐变大、颗粒逐渐变小,所得到的催化剂其活性也较高；其中,未经煅烧的Cu-ZnO/ZrO2催化剂的活性最佳,其甲醇时空产率为106.02 g/(kg·h),选择性达87.04%。
통과공침정법제비료Al、Zr화Ce개성적Cu-ZnO기저온갑순합성최화제,채용담기물리흡부、H2-TPR、CO2-TPD、N2 O적정、XRD화TEM등기술대기진행료표정,병고찰료개성조분화단소온도대기재170℃하합성기제갑순최화성능적영향。결과표명,경Zr개성적Cu-ZnO기최화제,기저온갑순합성성능교호；수착단소온도적강저,Cu재최화제표면적분산도축점변대、과립축점변소,소득도적최화제기활성야교고；기중,미경단소적Cu-ZnO/ZrO2최화제적활성최가,기갑순시공산솔위106.02 g/(kg·h),선택성체87.04%。
A series of Cu-ZnO-based catalysts modified with Al, Zr, and Ce for the low-temperature methanol synthesis were prepared through co-precipitation and characterized by N2 sorption, H2-TPR, CO2-TPD, N2 O titration, XRD, and high-resolution TEM; the effect of various modifiers and calcination temperature on their catalytic performance in methanol synthesis at 170 ℃ was investigated. The results showed that the Cu-ZnO-based catalyst modified with ZrO2 , among the various modifiers, exhibits the highest activity. Meanwhile, a lower calcination temperature is propitious to get a higher Cu dispersion, a smaller Cu crystal size, and a higher low temperature activity for methanol synthesis; as a result, the uncalcined catalyst exhibits excellent catalytic performance, with a productivity of 106. 02 g/(kg·h) and a selectivity of 87. 04% to methanol.