摘要
实验研究了反应气流中SO_2对低浓度甲烷在Cu/γ-Al_2O_3颗粒上催化燃烧特性的影响规律,考察了硫在催化剂上的累积作用,探讨了催化剂硫中毒的原因。研究表明:SO_2存在时,燃烧反应时Cu/γ-Al_2O_3催化剂发生硫中毒,且中毒效应随着SO_2浓度的增加而加深;经预硫化处理的催化剂的活性有所下降,且低温段硫中毒效应更为明显,较高的反应温度能够使生成的硫酸盐发生分解,减少对催化剂活性的影响;造成Cu/γ-Al_2O_3催化剂硫中毒的原因是催化剂内有硫酸盐的生成,减少了活性位点及比表面积,阻碍了活性位点对甲烷分子的吸附,从而降低了催化剂活性。
The influences of SO_2 on low concentration methane catalytic combustion over CU/γ-Al_2O_3particles were experimentally studied.Sulfur accumulation effects on catalyst were investigated,and the mechanism of sulfur poisoning effect on catalyst was discussed.The results show that CU/γ-Al_2O_3 particles were poisoned during sulfur-bearing low concentration methane catalytic combustion.The sulfur poisoning effect was intensified with increase of SO_2 concentration.The catalyst activity was slightly reduced after pre-sulfur treatment,and the sulfur poisoning effect was even more obvious in low temperature zone.A higher temperature could promote decomposition of sulfate,and reduce the poisoning effect of SO_2 on catalyst.The major reason of catalyst sulfur poisoning is the generated sulfate on the catalyst surface,reduce the active sites and specific surface area,block the adsorption of methane to active sites,and decrease the catalyst activity.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2014年第9期1771-1774,共4页
Journal of Engineering Thermophysics
基金
国家自然科学基金(No.51206200)
中央高校基本科研业务经费(No.CDJZR12140031)
