Preparation of NiPt/SBA-15 nanocatalyst and its catalytic performance for the dehydrogenation of hydrous hydrazine
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摘要: 本研究采用浸渍还原法制备了不同金属比例的NiPt双金属负载SBA-15(介孔二氧化硅)催化剂,对其催化水合肼脱氢性能进行了研究。研究结果表明,在催化剂的制备过程中Pt和Ni形成了合金,两种金属的电子协同效应可以有效地促进催化剂的催化性能,SBA-15与金属活性组分之间的相互作用有助于改善催化剂的催化性能和循环稳定性。Pt6Ni4/SBA-15催化剂催化水合肼脱氢的反应活化能为45.6 kJ/mol,TOF值为2123.3 h−1,优于大部分已经报道的催化剂。Abstract: As the most promising hydrogen storage material, hydrous hydrazine (N2H4·H2O) has attracted extensive attention and interest of researchers. In this paper, NiPt bimetallic supported SBA-15 (mesoporous silica) catalysts with different metal ratios were prepared by a simple impregnation reduction method, and their catalytic hydrous hydrazine dehydrogenation performance was studied. The research results show that Pt and Ni form an alloy during the preparation of the catalyst, the electronic synergistic effect of the two metals can effectively promote the catalytic performance of the catalyst, and the interaction between SBA-15 and the metal active components helps to improve the catalytic performance and cycling stability of catalysts. The activation energy of the Pt6Ni4/SBA-15 catalyst is 45.6 kJ/mol and the TOF value is 2123.3 h−1, which are better than most of the reported catalysts.
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Key words:
- hydrous hydrazine /
- dehydrogenation /
- NiPt /
- SBA-15
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图 7 (a) Pt6Ni4/SBA-15在不同浓度的碱溶液中催化水合肼脱氢产生的气体当量与反应时间曲线,(b) Pt6Ni4/SBA-15催化水合肼脱氢循环使用性能
Figure 7 (a) Pt6Ni4/SBA-15 catalyzed dehydrogenation of hydrous hydrazine in alkaline solutions with different concentrations of gas equivalent versus reaction time under the condition of 323 K; (b) Pt6Ni4/SBA-15 in fives run for decomposition of hydrous hydrazine
表 1 323 K下碱性溶液中水合肼分解制氢各种金属催化剂的催化活性
Table 1 Catalytic performances of various metal catalysts for hydrogen generation from the decomposition of hydrous hydrazine in alkaline solution at 323 K
Catalyst TOF/h−1 Ea/(kJ·mol−1) Ref. Pt6Ni4/SBA-15 2123.3 45.6 this work Ni3Pt7/BNG-1000 199.4 28.4 [27] G4-OH (Pt12Ni48) 240 − [33] Ni84Pt16/graphene 415 40 [34] Ni60Pt40/NC-700 1602 48.3 [16] Ni87Pt13/MA 160 55.7 [14] Ni@Ni-Pt/La2O3 312 56.2 [32] Ni0.8Pt0.2/DT-Ti3C2Tx 1220 67.1 [35] Ni0.9Pt0.1/MIL-101/rGO 960 50.6 [36] Ni88Pt12@MIL‐101 375.1 51.29 [11] Ni3Pt7/graphene 416 49.36 [37] (Ni3Pt7)0.5-(MnOx)0.5/NPC-900 706 50.2 [38] Rh47Ni18P35@MOF-74 715.4 49.39 [39] Ni37Pt63/g-C3N4 570 36.6 [40] Ni0.4Pt0.6/CNTs 1725.3 36.3 [4] Pt0.6Ni0.4/PDA-rGO 2056 33.39 [23] -
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