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首页> 外文期刊>Catalysis science & technology >New insights into the effect of nitrogen incorporation in Mo: catalytic hydrogenation vs. hydrogenolysis
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New insights into the effect of nitrogen incorporation in Mo: catalytic hydrogenation vs. hydrogenolysis

机译：氮的影响的新见解公司在莫:催化加氢vs。氢解作用

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The catalytic effect of nitrogen incorporation into Mo on hydrogenation (of -NO2 to -NH2 in nitrobenzene to aniline) and hydrogenolysis (of -C?O in benzaldehyde to toluene) processes has been assessed. Bulk Mo was prepared by temperature programmed reduction of MoO3 (in H-2 to 933 K) and -Mo2N (confirmed by powder XRD) subsequently synthesised by Mo nitridation in N-2/H-2. Two intermediate samples (MoN-1 and MoN-2) with different Mo/N ratio were prepared by altering the duration (1 and 2 h) of the nitridation step. XPS analysis revealed a nitrogen surface enrichment (Mo/N = 2.2 0.9 from MoN-1 to -Mo2N) relative to the bulk (Mo/N = 5.1 2.5). Incorporation of N did not affect morphology and each sample exhibited (by SEM analysis) aggregates (<5 m) of crystals (27-36 nm) with unchanged specific surface area (ca. 4 m(2) g(-1)). Hydrogen chemisorption and release (by TPD) increased with decreasing Mo/N (Mo < MoN-1 < MoN-2 < -Mo2N). Gas phase hydrogenation of nitrobenzene to aniline exhibited increasing rate from Mo -Mo2N, attributed to higher availability of surface heterolytic hydrogen (on Mo-N). In contrast, conversion of benzaldehyde to toluene was favoured by increasing Mo/N (from -Mo2N Mo) where hydrogenolytic -C?O scission is favoured by homolytic hydrogen chemisorption (on Mo). Our results provide the first evidence that N incorporation in Mo structure can control catalytic hydrogenation vs. hydrogenolysis performance.
机译：氮结合的催化效果成钼加氢(no2 - nh2硝基苯和苯胺)和氢解作用- c ?被评估。温度设定减少MoO3 (2933 K)和-Mo2N(经粉末XRD)后来莫渗氮合成的n / 2。MoN-2)与不同的Mo / N比率所准备的改变持续时间(1和2 h)氮化的步骤。氮表面浓缩(Mo / N = 2.2 - 0.9MoN-1 -Mo2N)相对于批量(Mo / N = 5.12.5)。形态和每个样本(通过SEM展出分析)聚合(< 5米)的晶体(27-36纳米比表面积(ca)与不变。4(2) g(1))。(兼总经理)增加与减少Mo / N (Mo

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