铜对γ-Al₂O₃负载铁基费-托合成催化剂还原性能的影响

铜对γ-Al 2 O 3 负载铁基费-托合成催化剂还原性能的影响 Effects of Copper on the Reducibility of γ-Al 2 O 3 Supported Iron Fischer-Tropsch Catalysts 张煜华 ZHANG Yu-hua 1 2 first-author 熊海峰 XIONG Hai-feng 1 2 李金林 LI Jin-lin 1 2 中南民族大学化学与生命科学学院 中南民族大学化学与生命科学学院 College of Chemistry and Life Sciences, South-Central University for Nationalities College of Chemistry and Life Sciences, South-Central University for Nationalities 中南民族大学化学与生命科学学院,湖北,武汉,430074 中南民族大学化学与生命科学学院,湖北,武汉,430074 采用X 射线衍射、氢气程序升温还原、氢气程序升温脱附和氧滴定等技术对浸渍法制备的γ Al2O3负载铜/铁费 托合成催化剂进行了表征.结果表明铁以无定型状态处于催化剂载体表面;铁和γ Al2O3载体之间的相互作用使铁氧化物的还原变得困难,还原度较低.少量铜促进了Fe2O3向Fe3O4的还原,降低了该还原过程的起始温度,增大了铁的还原度,增加了催化剂对氢气的化学吸附.但随着铜含量增大,铜铁之间的相互作用逐渐增强,反而抑制了铁氧化物的还原和催化剂对氢气的化学吸附. The γ-Al 2 O 3 supported iron Fischer\|Tropsch catalysts with different copper loading were prepared using incipient wetness impregnation. the reduction, hydrogen desorption, dispersion and crystalline size of the catalysts were studied by X-ray diffraction （XRD）, hydrogen temperature-programmed reduction (H 2 -TPR), hydrogen temperature-programmed desorption (H 2 -TPD) and oxygen titration （respectively.） It is shown that the metal-support interaction between iron and γ-Al 2 O 3 support affects the （reducibility） of iron oxide, and complete reduction is difficult. A small amount of copper can promote the reduction of Fe 2 O 3 to Fe 3 O 4 . However, intimate interaction occurs between the iron and copper with the （increasing） of copper loading, which causes the reduction of iron oxide more difficult. the metal-metal interaction between iron and copper influences the hydrogen-chemisorption properties of metallic iron. 费托合成 铁 铜 γ-Al2O3 X-射线衍射 氢气程序升温还原 氢气程序升温脱附 氧滴定 Fischer-Tropsch synthesis supported iron catalyst copper promoted γ-Al2O3 XRD（X-ray diffraction） H2-TPR（hydrogen temperature-programmed desorption） H2-TPD（hydrogen temperature-programmed reduction） oxygen titration O643.3 国家自然科学基金（20373090）;湖北省杰出青年人才基金（2003ABB013）;教育部留学归国人员科研启动基金;教育部优秀青年教师资助计划项目;国家民委重点基金资助项目 2004-04-01 2021-04-01 4