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·2530·                            精细化工   FINE CHEMICALS                                 第 38 卷

                 在 CO-NO 反应中,由于 CO 的还原能力比活性                    [7]   WANG  B, CAI H  R, SHEN S H.  Single atom  catalysts[J]. Small
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            炭强,同时非均相反应较均相反应更容易进行,因
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            此,CO 更容易转移 Fe(O)上的活性氧,同时也抑制                            analysis of reduction mechanism of Fe 2O 3[J]. Natural Gas Chemical
                                 0
            了炭材料的消耗。在 Fe 的催化下,CO 也可以直接                             Industry (天然气化工), 2021, 46(1): 66-68.
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            还原部分被氧化的 Fe 3 O 4 ,释放更多的活性位点,有                         of NO by activated carbons impregnated with Fe based catalysts[J].
            效地提升了催化剂寿命。                                            International Journal of Hydrogen Energy, 2019, 46: 25265-25275.
                         Fe(O) CO    CO   2  Fe         (9)   [10]  Standardization Administration of the People's Republic of China.
                                                                   Pulps-determination of ash: GB/T 742—1989[S]. Beijing: China
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                 本文采用浸渍法,以 H 2 作为还原剂制备出一系                      [12]  WANG H R, LI X C, ZHU M M, et al. Preparation and evaluation of
                                                                                                   0
            列负载在活性炭载体上以纳米级零价铁作为活性组                                 catalysts of highly dispersed zerovalent iron (Fe ) supported on
                                                                   activated carbon for NO reduction[J]. Fuel, 2021, 303: 121252.
            分的催化剂,研究了催化剂的制备条件(H 2 体积分
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            数,煅烧温度及时间)对催化剂的分散性以及催化                                 zero-valent iron for removal of Pb  from aqueous solution:
                                                                                           2+
            还原 NO 活性的影响。结果表明,纳米级零价铁催                               Reactivity, characterization and mechanism[J]. Water  Research,
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            化剂具有较高的催化还原 NO 活性。随着催化剂制                           [14]  ZHANG S M, ZHANG H Y, ZHANG W M, et al. Induced growth of
            备过程中 H 2 体积分数的增加,催化剂分散性变化较                             Fe-N x active sites  using carbon templates[J]. Chinese Journal of
                                                                   Catalysis, 2018, 39: 1427-1435.
            小,但催化剂的活性逐渐增强。随着催化剂制备还
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            原温度的升高,催化剂的分散性逐渐减弱,催化剂                                 one[J]. Nature, 2015, 525: 325-326.
            的活性呈现出先增加后降低的趋势。随着催化剂制                             [16]  CHENG X X, ZHENG X Y, SU S X, et al. NO reduction by CO over
                                                                   copper catalyst supported on mixed CeO 2 and Fe 2O 3: Catalyst design
            备还原时间的增加,催化剂的分散性及活性逐渐增
                                                                   and activity test[J]. Applied Catalysis B: Environmental, 2018, 239:
                                       0
            强。当反应温度为 325 ℃,Fe /BAC-100%H 2 -700(3)                 481-501.
            催化剂催化还原 NO 活性可以达到 100%。反应过程                        [17]  WANG H R, LI X C, MENG F R, et al. Preparation and evaluation
                                                                   of iron nanoparticles embedded CNTs grown on ZSM-5 as catalysts
                   0
                                                     0
            中,Fe 逐渐被氧化生成 Fe 3 O 4 ,活性组分 Fe 含量                      for NO decomposition[J]. Chemical Engineering Journal, 2020, 392:
            降低致使催化剂失活,失活后的催化剂经再生处                                  123798.
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            理后可以恢复活性。还原 NO 过程中 CO 的加入可以
                                                                   removal from simulated flue gas using a Fe/Gr periodically reversing
            有效的地抑制载体碳材料的消耗,同时也加快了活性                                electro-activated peroxymonosulfate system[J]. Separation and
            氧的转移,减缓了催化剂失活速率,延长了催化剂活                                Purification Technology, 2020, 253: 117389.
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