甲烷部分氧化制合成气的研究——不同Ni担载量催化剂的反应活性考察

Syngas production from the partial oxidation of methane—The reactivity of supported catalyst with different nickel content

在微型固定床反应器中，考察了不同担载量的镍系催化剂对甲烷部分氧化制合成气的催化反应行为的影响。结果表明：ｗ（Ｎｉ） ＝ ５ ％ 催化剂上的甲烷部分氧化的活性和ＣＯ 选择性最佳，在８２０ ℃时，该体系能获得９１－３ ％ 的ＣＨ４ 转化率，９７－２ ％ 的ＣＯ 选择性。在实验温度７５０ ～８７０ ℃内，随着反应温度的升高，该催化剂上的催化活性和ＣＯ 选择性均增加。在８７０ ℃时，ＣＨ４ 转化率为９４－３ ％ ，ＣＯ 选择性为９７－６ ％ 。用ＴＰＲ、ＸＲＤ 表征该系列催化剂的物化特性，将ＴＰＲ 和ＸＲＤ 的表征结果（ ｗ（Ｎｉ） ＝ ５ ％ 的催化剂没有ＮｉＯ 晶相，而 ｗ（Ｎｉ） ＝ ８ ％ ～１８ ％ 的催化剂有该晶相） 及反应温度与Ｎｉ 担载量进行关联，可解释反应结果。

The influences of the catalysts with different supported nickel content on catalytic performance were investigated in a fixed bed microreactor. It was shown that the catalyst with 5% nickel gave the best results for the activity and CO selectivity.With this catalyst,a methane convesion of 92 3% and a CO selectivity of 97 2% were obtained at 820℃。In the operating temperature range(750～870℃),catalytic activity and CO selectivity increased with reactive temperature rising,and at 870℃,methane conversion and CO selectivity were,respectively,94 3% and 97 6%. TPR and XDR techniques were used for catalyst characterizations. By relating TPR and XRD results and temperature with supported Ni amount, the reactive results could be explained.