水蒸气对Ni/Ce-Zr-Al-Ox催化剂上CO2重整CH4瓜的影响

采用水热合成-负载法制备了Ni/Ce-Zr-Al-Ox催化剂,测试了该催化剂上CO2重整CH4反应的活性和稳定性,并考察了添加少量水蒸气对CO2重整CH4反应的影响.结果表明,在不含水蒸气的反应气中反应198 h后CH4和CO2的转化率分别为89%和98%,H2/CO摩尔比约为1.00,且没有任何失活.添加3.2%的水蒸气后,CH4转化率提高到94%,CO2转化率不变,H2/CO摩尔比约提高0.06,同时稳定性也很好.计算结果表明,添加少量水蒸气后,CO2重整CH4被促进,逆水煤气反应被抑制,而水蒸气重整CH4没有明显变化.

Effect of Steam on Catalytic Activity of Ni/Ce-Zr-Al-Ox for CO2 Reforming of CH4

A Ni/Ce-Zr-Al-O x catalyst was prepared by hydrothermal synthesis-impregnation method. Its catalytic activity and stability in CO 2 reforming of CH 4 were measured, and the effect of small amount of steam on the reaction was studied. During reaction for 198 h, the CH 4 conversion and CO 2 conversion were 89% and 98% respectively, the product H 2/CO molar ratio was about 1 00, and the catalyst did not show any deactivation without steam. By adding 3 2%steam in the feed gas, the CH 4 conversion and H 2/CO molar ratio increased to 94% and about 1 06 respectively, the CO 2 conversion did not change, and the catalyst showed very stable. The calculation analysis showed that, by adding a small amount of steam in feed gas, the CO 2 reforming of CH 4 was promoted and the steam reforming of CH 4 did not change obviously, while the reverse water gas shift was suppressed.