摘要
采用共沉淀法制备了 CuO/ZnO/ZrO_2催化剂,研究了 m(CuO):m(ZnO):m(ZrO_2)=70:15:15的催化剂脱除乙烯物料中 CO 的情况。在反应温度90℃、反应压力2 MPa、空速3 000 h^(-1)的条件下,CuO/ZnO/ZrO_2催化剂可将乙烯物料中体积分数为2.4×10^(-6)的 CO 深度脱除至3×10^(-8)以下,它的活性明显优于工业 BR9201(m(CuO):m(ZnO)=30:70)催化剂。采用 X 射线衍射、X 射线光电子能谱、H_2-程序升温还原、高分辨透射电子显微镜等于段对催化剂进行了表征。表征结果显示,CuO/ZnO/ZrO_2催化剂中的 ZrO_2主要以无定形的状态存在。对比工业 BR9201催化剂和 CuO/ZnO/ZrO_2催化剂得知,虽 CuO 质量分数从30%提高到70%,但 CuO 晶粒的尺寸由12.9 nm 减小到6.0 nm,ZrO_2的引入促进了 CuO 活性位的分散,大大提高了催化活性。
A new CuO/ZnO/ZrO2 catalyst with m（CuO） ： m（ZnO） ： m（ZrO2） =70 ： 15 ： 15 was prepared by co-precipitation and was used in removal of trace amount of carbon monoxide in ethylene. Under the conditions： 90 ℃, 2 MPa and GHSV 3 000 h^-1 the CO in ethylene can be reduced from 2.4 × 10^-6（ volume fraction） to lower than 3 × 10^-8. Under the same reaction condition, by using commercial BR9201 CuO/ZnO catalyst with m（CuO） ： m（ZnO） = 30 ： 70, CO in ethylene can only be reduced to level of 3 × 10^-7. Obviously CuO/ZnO/ZrO2 catalyst shows better performance than BR9201 catalyst. The new catalyst was characterized by means of BET, XRD, XPS, H2-TPR and HRTEM. ZrO2 is found to exist in amorphous form. Comparing with BR9201 catalyst, although CuO content in the new catalyst increases from 30% to 70%, by introduction of amorphous ZrO2 to the new catalyst, crystalline size of CuO decreases from 12.9 nm to 6.0 nm, which improve dispersion of active sites and lead to higher efficiency in carbon monoxide removal. So CuO/ZnO/ZrO2 will become a potential industrial catalyst for removal of trace amount of carbon monoxide in ethylene to meet the requirement of ethylene polymerization.
出处
《石油化工》
EI
CAS
CSCD
北大核心
2008年第11期1121-1126,共6页
Petrochemical Technology
关键词
氧化铜
氧化锌
氧化锆
脱除-氧化碳
乙烯
催化剂
copper oxide
zinc oxide
zirconia
removal of carbon monoxide
ethylene
catalyst
