Preparation of NiPt/Ti2O3 nanocatalyst and its catalytic performance for hydrogen production from hydrazine hydrate
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摘要: 本研究利用H2还原制备Ti2O3载体后，通过湿化学浸渍-还原法制备NiPt/Ti2O3纳米催化剂进行催化水合肼研究。研究表明，在催化剂的制备过程中，Ni和Pt之间形成了一种合金，该合金的形成使催化剂的催化活性升高，Ti2O3与NiPt合金的相互作用提升了催化剂催化性能和循环稳定性。Ni5Pt5/Ti2O3催化剂催化水合肼产氢的反应的TOF值为1076.1 h−1。Abstract: Hydrazine hydrate is the most promising hydrogen storage material with a hydrogen content of 8.0%. In this paper, after Ti2O3 support was prepared by H2 reduction, NiPt/Ti2O3 nanocatalyst was prepared by wet chemistry impregnation reduction method and used to catalyze hydrazine hydrate. The research shows that an alloy is formed between Ni and Pt during the preparation of the catalyst, and the formation of the alloy increases the catalytic activity of the catalyst. The interaction between Ti2O3 and NiPt alloy is helpful for the catalytic performance and cyclic stability of the catalyst. The TOF value of the Ni5Pt5/Ti2O3 catalyst for hydrogen production from hydrazine hydrate is 1076.1 h−1, which is superior to the reported catalyst performance.
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Key words:
- hydrazine hydrate /
- hydrogen production through decomposition /
- NiPt /
- Ti2O3
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图 1 Ni0.5Pt0.5/Ti2O3催化剂的SEM图像和锚定NiPt NPS在Ti2O3上的粒径分布
Figure 1 SEM images of Ni0.5Pt0.5/Ti2O3 catalyst ((a)，(b)，(c)), and anchored NiPt NPS particle size distribution on Ti2O3 (d)
图 2 Ni0.5Pt0.5/Ti2O3催化剂各元素的面扫描图像
Figure 2 The elemental mapping images of Ni0.5Pt0.5/Ti2O3 catalysts for each element
图 4 Ni0.5Pt0.5/Ti2O3催化剂、未负载金属粒子的Ti2O3催化剂载体和PtNi的XRD图像
Figure 4 XRD patterns of Ni0.5Pt0.5/Ti2O3 catalyst, Ti2O3 catalyst carrier without loaded metal particles and NiPt
图 5 Ni0.5Pt0.5/Ti2O3的XPS总谱图(a)、O 1s (b)、Ni 2p (c)和Pt 4f(d)的XPS光电子能谱谱图
Figure 5 XPS photoelectron spectra of Ni0.5Pt0.5/Ti2O3 spectrum (a), O 1s (b), Pt 4f (c) and Ni 2p (d)
图 6 不同的Ni/Pt物质的量比率下，NiPt/Ti2O3催化剂催化水合肼脱氢性能图(a)；不同的Pt/Ni物质的量比率下，NiPt/Ti2O3所对应的催化剂TOF值图(b)
Figure 6 Catalytic performance of NiPt/Ti2O3 catalyst for dehydrogenation of hydrazine hydrate under different Ni/Pt molar ratios (a); TOF values of catalysts corresponding to NiPt/Ti2O3 under different Pt/Ni molar ratios (b)
图 7 (a) Ni0.5Pt0.5/Ti2O3在不同温度下催化水合肼脱氢速率曲线；(b)呈现的是(a)所对应的阿伦尼乌斯曲线
Figure 7 (a) Ni0.5Pt0.5/Ti2O3 catalytic dehydrogenation rate curves of hydrazine hydrate at different temperatures；(b) Arrhenius curve corresponding to (a)
图 8 Ni0.5Pt0.5/Ti2O3催化水合肼脱氢循环使用性能
Figure 8 Ni0.5Pt0.5/Ti2O3 performance in 1st to 5th runs for decomposition of hydrous hydrazine
表 1 Ni0.5Pt0.5/Ti2O3催化剂的ICP-AES分析
Table 1 ICP-AES analysis results of Ni0.5Pt0.5/Ti2O3 catalyst
Catalyst Ni Pt initial ratio Ni Pt finial ratio NiPt/Ti2O3 5∶5 0.497∶0.502 
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表 2 不同水合肼脱氢催化剂的催化性能
Table 2 Catalytic activities of different catalysts for N2H4·H2O decomposition
Catalyst Selectivity for H2 (100%) TOF/h−1 Ea/(kJ·mol −1) Temperature/℃ Ni0.5Pt0.5/Ti2O3 100 1076.1 47.76 50 Rh55Ni45/Ce(OH) 100 395 38.8 50 Rh34Ni66@ZIF-8 100 140 58.1 50 Pt0.6Ni0.4/PDA-rGO 100 2056 33.39 50 (Ni3Pt7)0.5-(MnOx)0.5/NPC-900 100 706 50.15 50 PtNi/CeO2 100 286 38.7 50 Ni3Pt7/BNG-1000 100 199.4 28.4 30 Ni0.9Pt0.05Rh0.05/La2O3 100 45.9 25 Ni0.58Pt0.42/graphene 100 434 23.9 30 Ni0.9Pt0.1/MIL-101 100 140 48.4 30 (Ni3Pt7)0.5-(MnOx)0.5 100 120 25 Ni/CeO2 100 34 50 CoPt/La(OH)3 100 2400 45.2 50 Ni0.8Pt0.2/DT-Ti3C2Tx 100 1220 64.3 50 Ni-La(OH)3/D-MIL-125 100 2381 36.8 70
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