负载Ni-Pt双金属催化剂催化水合肼脱氢性能的研究

发布时间：2018-05-09 13:08

本文选题：水合肼脱氢 + 载体　；参考：《安徽工业大学》2017年硕士论文

【摘要】：随着化石燃料的持续消耗带来的能源危机,新能源的开发和利用成为了未来能源社会的发展方向。氢能,作为一种高效、清洁、来源丰富的二次能源,被认为是未来人类的理想能源之一。然而,由于氢气具有很低的体积能量密度和质量能量密度,安全、高效地储存和运输氢气成为实现氢能社会的一大挑战。为了解决这一难题,开发安全和高效的化学储氢材料替代传统的化石燃料引起了人们广泛的研究兴趣。其中,水合肼具有很高的质量能量密度(8 wt%),而且在室温下呈液态,可以安全地储存和运输。更重要的是,水合肼完全分解的产物只有氢气和氮气,没有其他固体副产物。本文研究内容是开发一种在温和条件下能够高效催化水合肼脱氢的催化剂。实验采用简单的共还原法将Ni、Pt纳米粒子固定于Li Cl改性的g-C_3N_4载体上,在碱性条件下进行水合肼分解。研究结果表明,水合肼脱氢在Ni_6Pt_4/g-C_3N_4纳米片催化剂催化作用下催化性能最好,水合肼分解在50°C、120 mg NaOH情况下1.5 min可完全反应。H2选择性可高达100%。所以催化剂Ni_6Pt_4/g-C_3N_4纳米片具有优越的催化性能。在此催化剂的基础上做了进一步的改进,结果显示,加入Mn(NO_3)_2溶液对g-C_3N_4纳米片载体做进一步的改性,质量分数为50%的Mn(NO_3)_2溶液为2 ml、Ni、Pt金属负载比例为4:6时,制备出的Ni4Pt6/MnO_x-g-C_3N_4纳米片催化剂催化性能最好。此催化剂催化水合肼在50°C、120 mg NaOH情况下完全分解需要时间为1.2 min,H2选择性可高达100%,与Ni_6Pt_4/g-C_3N_4纳米片催化剂相比,催化性能更好,具有很好的应用前景。
[Abstract]:With the sustainable consumption of fossil fuels, energy crisis, the development and utilization of new energy has become the future direction of energy society. Hydrogen energy, as a kind of high efficient, clean and abundant secondary energy, is considered to be one of the ideal energy sources in the future. However, due to the low volume energy density and mass energy density of hydrogen, the safe and efficient storage and transport of hydrogen has become a major challenge to realize hydrogen energy society. In order to solve this problem, the development of safe and efficient chemical hydrogen storage materials instead of traditional fossil fuels has attracted widespread interest. Hydrazine hydrate has a high mass energy density of 8 wtand is liquid at room temperature and can be safely stored and transported. More importantly, hydrazine hydrate completely decomposes the products only hydrogen and nitrogen, no other solid by-products. In this paper, a catalyst for dehydrogenation of hydrazine hydrate under mild conditions was developed. A simple co-reduction method was used to immobilize the nioct Pt nanoparticles onto the g-C_3N_4 support modified by LiCl and decompose hydrazine hydrate under alkaline conditions. The results show that the catalytic performance of hydrazine hydrate dehydrogenation is the best under the catalysis of Ni_6Pt_4/g-C_3N_4 nanoparticles, and the selectivity of 1. 5 min can be up to 100% when the decomposition of hydrazine hydrate is 50 掳C ~ (2) mg / NaOH. Therefore, the catalyst Ni_6Pt_4/g-C_3N_4 nanoparticles have excellent catalytic performance. On the basis of this catalyst, further improvement was made. The results showed that the support of g-C_3N_4 nanoparticles was further modified by adding Mn(NO_3)_2 solution, when the loading ratio of 2 ml / NiPt metal to 50% Mn(NO_3)_2 solution was 4:6, The catalytic performance of the prepared Ni4Pt6/MnO_x-g-C_3N_4 nanocrystalline catalyst is the best. The catalytic activity of this catalyst for the complete decomposition of hydrazine hydrate at 50 掳C ~ (-1) (120 mg / NaOH) was 1.2 min / h ~ (2). Compared with the Ni_6Pt_4/g-C_3N_4 nanoscale catalyst, the catalytic performance of the catalyst was better, and the catalyst had a good prospect of application.
【学位授予单位】：安徽工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O643.36;O623.752

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