【摘要】 采用浆料涂覆法制得Zn Fe2O4-α-Fe2O3/Si C泡沫结构催化剂。研究催化剂床层高度、催化剂负载量和不同负载量结构催化剂组合对催化1-丁烯氧化脱氢性能和床层温升分布的影响。结果表明:催化剂负载量为0.2 g/m L、床层高度为12~36 mm时,随着床层高度的增加,1-丁烯转化率缓慢下降,丁二烯产量呈线性增长趋势;当床层高度为48 mm时,床层入口温升过高,使1-丁烯转化率降低且丁二烯产量显著偏离线性增长关系;降低催化剂负载量可以降低床层入口温升,提高1-丁烯转化率;采用负载量为0.082和0.164 g/m L的结构催化剂组合进行装填时,1-丁烯转化率提高到82%,丁二烯产量回归线性增长关系。在床层高度为48 mm的结构催化剂的最佳氧烯摩尔比为0.85、水烯摩尔比为8~18时,催化剂的氧化脱氢性能变化不大。更多还原

【Abstract】 ZnFe₂O₄-α-Fe₂O₃/SiC foam structured catalyst was fabricated by a slurry-coating method.The influences of catalyst bed height,catalyst loading and the combination of structured catalyst with different catalyst loading on the catalytic performance and temperature rise of the structured catalyst bed were studied.Results showed that when the catalyst loading was 0.2 g/m L,1-butene conversion gradually decreased,but butadiene yield increased linearly with the increase of structured bed height from 12 mm to36 mm.When the height of catalyst bed was 48 mm,the over-high inlet temperature caused the reduction of 1-butene conversion and the deviation of butadiene yield from linearity.Reducing the catalyst loading could lower the inlet temperature rise and improve the 1-butene conversion.When the combination of structured catalysts with catalyst loading of 0.082 and 0.164 g/m L was used,1-butene conversion increased up to 82%and butadiene yield regressed to the linear relationship.The optimum molar ratio of oxygen to 1-buetne on the structured catalyst of 48 mm height was 0.85 and when molar ratio of steam to1-buetne was in the range of 8 to 18,and the catalytic performance remained unchanged.更多还原