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共沉淀法制备的MgO/La2O2CO3催化剂使甲烷氧化偶联(OCM)在炉温460℃时开始反应,且使反应在50℃炉温下至少24 h。助剂Ni的加入降低了起始和最低反应温度,使催化剂在380℃的炉温下开始反应,之后在无热源的情况下可使反应至少24 h。助剂Zn的加入提高了反应活性,使C2的选择性提高了6%,但同时对低温反应不利,反应在炉温100℃下6 h后自动停止。OCM体系中的强放热反应为OCM温和反应提供了热源。催化剂中的La2O2CO3是维持低温甲烷氧化偶联反应的关键H活性组分。
Coprecipitation method prepared MgO / La2O2CO3 catalyst so that the oxidation of methane coupling (OCM) at a furnace temperature of 460 ° C to start the reaction, and the reaction at a furnace temperature of 50 ℃ at least 24 h. The addition of promoter Ni reduces the initial and the lowest reaction temperature, allowing the catalyst to start the reaction at a furnace temperature of 380 ° C, after which time the reaction can be allowed to proceed for at least 24 h in the absence of a heat source. Addition of Zn as additive increased the reactivity and increased the selectivity of C2 by 6%, but at the same time it was unfavorable to low temperature reaction. The reaction was stopped automatically after 6 h at 100 ℃. The strong exothermic reaction in the OCM system provides a heat source for the mild reaction of OCM. La2O2CO3 in the catalyst is the key H active component to maintain the low temperature methane oxidative coupling reaction.