【摘 要】
：
采用并流共沉淀法制备了不同Cu/Zn比的铜锌催化剂前驱体,利用XRD和FT-IR表征手段对前驱体物相组成及同晶取代过程进行分析,XRD和H2-TPR表征手段且结合Bragg公式分析了前驱体经焙烧后的催化剂协同作用及分散性.结果表明,在Cu/Zn=100/0时,前驱体中只有单斜晶系孔雀石Cu2CO3(OH)2物相,焙烧后的催化剂CuO晶型较好、粒径较大、分散度较低；当原料中引入Zn2+并且增大加入量
【机 构】
：
太原理工大学煤科学与技术省部共建国家重点实验室,山西、太原迎泽西大街79号 030024
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采用并流共沉淀法制备了不同Cu/Zn比的铜锌催化剂前驱体,利用XRD和FT-IR表征手段对前驱体物相组成及同晶取代过程进行分析,XRD和H2-TPR表征手段且结合Bragg公式分析了前驱体经焙烧后的催化剂协同作用及分散性.结果表明,在Cu/Zn=100/0时,前驱体中只有单斜晶系孔雀石Cu2CO3(OH)2物相,焙烧后的催化剂CuO晶型较好、粒径较大、分散度较低；当原料中引入Zn2+并且增大加入量时,前驱体在2θ=14.63°、17.46°和24.07°处的特征衍射峰强度明显降低,在31.23°和42.44°处的特征衍射峰偏移至31.89°和42.40°,说明发生同晶取代生成了单斜晶系锌孔雀石(Cu,Zn)2(CO3)(OH)2物相,在1390-1520 cm-1波段内的C-O不对称伸缩振动吸收峰也发生了一定程度的偏移,焙烧后的催化剂在31°～33°、34°～37°范围内形成了平缓、弥散且强度较弱的衍射峰,生成铜锌固溶体,CuO分散在ZnO晶格中,ZnO充分分散了CuO,得到了分散性较好、还原温度较低的催化剂；继续增大Zn2+加入量时,在Cu/Zn=50/50时,在2θ=13.04°处出现了斜方晶系绿铜锌矿(Zn,Cu)5(CO3)2(OH)6物相,在Cu/Zn=40/60时,前驱体仅存绿铜锌矿物相,其分子式为(Zn0.6,Cu0.4)5(CO3)2(OH)6,与Zn5(CO3)2(OH)6在2θ=33.28°处的特征衍射峰相比,偏移至33.88°,在400-600 cm-1波段内M-O特征吸收峰向高波数偏移,焙烧后的催化剂峰型最弥散,峰强度最弱,还原温度最低.
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