中文摘要：

研究以柠檬酸为络合剂，得到Fe^3＋、Mo^6＋的络合液，以分子筛（HZSM-5）为载体，采用浸渍法制备了系列负载型MoFe／HZSM-5催化剂，对二甲苯选择性氧化为探针反应，测定其催化性能。催化剂的活性评价结果表明：金属原子的最佳配比为n（Mo）：n（Fe）=2．4：1；在600℃焙烧，反应温度为500℃，气体时空速率5500h^-1条件下，对苯二甲醛的选择性达到了最大值85．28％。分别用XRD、FT—IR、DSC对MoFe／HZSM-5进行表征，分析谱图得出了一致性结论，MoFe／HZSM-5的主要活性组分为Fe2（MoO4）3；HZSM-5作为载体，提高了对苯二甲醛的选择性，进而加深了对MoFe／HZSM-5微观结构、性质的了解，MoFe／HZSM-5的高活性、选择性，与其微观结构密不可分，为新型催化剂的研制及其工业应用提供了较好的实验依据。

英文摘要：

MoFe/HZSM-5 catalysts were prepared by the impregnation method, using citric acid to form Fe^3＋ and Mo^6＋ chelates as the impregnated solution. The catalytic performance of MoFe/HZSM-5 was evaluated using the selective oxidation of p-xylene as the probe reaction. The results showed that the optimum Mo ： Fe atomic ratio is 2.4 ： 1, and the terephthaldehyde selectivity reached the maximum value of 85.28% when the calcination temperature, reaction temperate and GHSV was 600, 500℃ and 5500h^-1 , respectively. The XRD, FTIR and DSC analysis showed that the active specie of the MoFe/HZSM-5 catalyst is Fe2 （MoO4）3. Micro-structure and essence disciplinarian of MoFe/HZSM-5 were disclosed, leading to its high activity and selectivity. The HZSM-5 support enhanced the selectivity of terephthaldehyde. This study could provide experimental data for preparation of new type catalyst and the technical reform of industry equipment.