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在自行设计和建立的加压动态分析装置上,研究了工业甲烷化催化剂(Ni/Al_2O_3)上CO的吸附和反应行为。结果表明,在反应温度250℃下催化剂上吸附的CO有可逆吸附和不可逆吸附之分,甲烷的生成是与不可逆吸附的CO作用的结果,而可逆吸附CO则与生成乙烷、丙烷等密切相关。同时发现甲烷化反应过程的发生必须以不可逆吸附的氢存在为前提,且催化剂上不可逆吸附的氢可分为两部分,一部分可以被CO顶出,这部分氢可能起到了诱导CO吸附的作用;另一部分不可逆吸附的氢不能被CO顶出,这部分氢可能是构成催化剂不可缺少的“组分”(或称“促进剂”)。
The adsorption and reaction of CO on industrial methanation catalyst (Ni / Al_2O_3) were investigated on a self-designed and established pressurized dynamic analyzer. The results show that the CO adsorbed on the catalyst at 250 ℃ has reversible adsorption and irreversible adsorption. The formation of methane is the result of the irreversible adsorption of CO. The reversible adsorption of CO is closely related to the formation of ethane and propane . At the same time, it was found that the occurrence of methanation reaction must be premised on the irreversible adsorption of hydrogen, and the irreversible adsorption of hydrogen on the catalyst can be divided into two parts, one part can be CO out, this part of hydrogen may play a role in inducing CO adsorption; The other part of irreversibly adsorbed hydrogen can not be pushed out by CO, and this part of hydrogen may be an “ingredient” (or “promoter”) indispensable to the catalyst.