催化剂英语综述

The oxidation reaction was run until the inhibition 氧化反应运行,直到抑制作用 state was reached. 国家的决赛。 After 3 h, the catalyst 3小时后,催化剂 was reactivated by adding a solution of KOH to 通过添加一个解决方案是重新启用氢氧化钾的 the reaction mixture until pH 9 was attained. 反应混合物直到pH 9日是达到的。 The 这 pH was further kept constant in the usual way after pH值被进一步保持不变在平时的方式 reactivation. 激活。 The reaction restarted immediately 立即的反应重新启动 and the remaining glucose was further oxidized 而剩下的葡萄糖被进一步氧化 (Fig. 3). (图3)。 This result is in agreement with the second 这个结果是一致的第二阶段 hypothesis. 假设。 Since the selectivity towards Dgluconic 对Dgluconic自选择性 acid is very high at the beginning of the 酸是非常高的刚开始的时候 reaction, we assume that this compound constitutes 反应,我们假设这个化合物构成 the main poisoning species. 主要中毒的物种。 Earlier we 开始的时候我们 reported on a similar poisoning effect on Pd/C as 报道了一个类似中毒效应对Pd / C作为 catalyst during the oxidation of D-glucose in acidic 在D-glucose氧化催化剂的酸 medium (reaction carried out without pH control) 进行中(没有反应酸度控制) [ 181. [181。 The ‘free’ carboxyl group of D-gluconic “自由”的D-gluconic硝酸 acid, the only reaction product formed according 酸,唯一的产物反应形成润泽 to HPLC, was considered to be responsible of the 对高效液相色谱(HPLC),被认为是负责任的 poisoning of the active sites of the noble metal 中毒的活性部位的贵金属 catalyst. 催化剂。 Also, electrocatalytic oxidation of D-gIu 综述了电催化氧化D-gIu也 case on a palladium electrode was found to suffer 案件被发现在钯电极承受不了 from the poisoning by ‘free’ gluconic acid [ 181. 从中毒的gluconic '自由酸[181。 However in the electrocatalytic literature, poisoning 然而,在电催化文学、中毒 of platinum electrodes is generally attributed 大体是因为白金电极 to adsorbed CO,+ Most experimental evidence is 对吸附有限公司是最具实验性证据+ based on the oxidation of methanol [ 19,201. 基于[19,201甲醇的氧化。 The 这 initial poisoning species in the case of the oxidation 在初始中毒的情况下物种被氧化 of methanol were adsorbed CHOad which was CHOad甲醇是水中所 supposed to be transformed to adsorbed COad 应该有可能转化为吸附科德签发的公开信 [ 201. [201。 In the case of the oxidation of glucose on a 在这个例子中葡萄糖氧化上 platinum electrode in acidic medium, COad was 白金电极在酸性介质、科德签发的公开信 detected as the major poisoning species [ 21-241. 为最主要的中毒检测[21-241物种。 However, the observation of COad by spectroscopic 然而,观察科德签发的公开信经光谱 methods is much easier than unambiguous 方法是容易得多,比清晰明确 identification of other complicated species such as 识别的物种,如其他的并发症 D-gluconic acid. D-gluconic酸。 The adsorbed COad observed is 观察吸附科德签发的公开信 resulting from C-C bond breaking due to degradation 造成债券打破由于12退化 of D-gluconic acid to a lower aldonic acid. 较低的酸D-gluconic aldonic酸。 Indeed, some arabinonic acid ( < 1%) was formed 事实上,一些arabinonic酸(< 1%)的成立 (Table 1). (表1)。 With the aim to check any poisoning of the 目的是检查任何中毒的 catalyst (5% Pt/C) by adsorbed COad, we have 催化剂(5%)Pt / C吸附科德签发的公开信,我们有 carrie 嘉莉 你的分给得不多哦！这样请不到高手的！