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将一种商用活性炭在氮气保护下进行微波处理 ,采用元素分析、XRD、N2 物理吸附和CO化学吸附等表征手段 ,考察了微波处理对活性炭载体的化学组成、物相、表面织构和催化剂钌分散度的影响 .以微波处理的活性炭为载体 ,以钡或钡铯为助剂 ,制备了一系列钌催化剂 ,在SV =10 0 0 0h-1,p =10 0MPa和θ =4 30℃的条件下进行了氨合成活性评价 .结果表明 ,活性炭经微波处理后能有效地脱除非碳成分 ,提高炭载体的稳定性 ,制备的负载型钌催化剂不仅具有较高的钌分散度 ,而且在一定温度范围内能够防止金属粒子烧结 ,从而使催化剂的活性和稳定性明显提高 .例如 ,以未经处理的活性炭为载体制备的4 %Ru Ba Cs/C催化剂 ,其出口氨浓度为 9 2 3% ,经 1 0MPa ,5 2 0℃耐热 36h后 ,其出口氨溶解度下降至 7 39% ;而以经微波处理的活性炭 (CW5 )为载体制备的 4 %Ru Ba Cs/CW 5催化剂 ,出口氨浓度为 16 78% ,经相同条件耐热后 ,其催化活性基本不变 .
A commercial activated carbon was microwaved under the protection of nitrogen. The chemical composition, phase, surface texture and catalyst ruthenium (Ru) were investigated by means of elemental analysis, XRD, N2 physical adsorption and CO chemisorption. Disperse degree.A series of ruthenium catalysts were prepared by using microwave-treated activated carbon as support and barium or barium-cesium as assistant to prepare a series of ruthenium catalysts with SV = 10 000h-1, p = 10 0MPa and θ = 430 ℃ The results showed that the activated carbon can effectively remove non-carbon components after microwave treatment and improve the stability of the carbon support. The prepared supported ruthenium catalyst not only has high ruthenium dispersion, For example, the 4% Ru Ba Cs / C catalyst prepared from untreated activated carbon has an outlet ammonia concentration of 92.3% , The solubility of ammonia in the outlet decreased to 7 39% after heat-resistant at 100 ℃ and 5 2 0 ℃ for 36h, while the 4% Ru Ba Cs / CW 5 catalyst prepared by microwave-treated activated carbon (CW5) concentration 1678% over the same heat conditions, the catalytic activity substantially constant.