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首页> 外文期刊>Journal of Sol-Gel Science and Technology >Adsorbent layer for adsorption heat pump prepared with the surface-modified ferroaluminophosphate particles and inorganic silica binder
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Adsorbent layer for adsorption heat pump prepared with the surface-modified ferroaluminophosphate particles and inorganic silica binder

机译：由表面改性的磷酸铝铝颗粒和无机二氧化硅粘合剂制备的用于吸附热泵的吸附剂层

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In this study, we prepared an adsorbent layer for adsorption heat pump by using ferroaluminophosphate (FAPO) particles and inorganic silica binder and characterized the physical properties thereof. We tried two ideas in preparing the adsorbent layer: dual precursor for binder and surface modification of the FAPO particles. The inorganic silica binder was prepared through a sol-gel process by using tetraethoxysilane (TEOS) and methyltriethoxysilane (MTES) as the dual precursor. The surface modification by TEOS molecules on the FAPO particles was done to promote the reactivity between particles and binder. The surface modification to form monolayer of silane was carefully done in a hydrophobic solvent, cyclohexane, preventing the supply of water molecules into the solution. As a result, both the use of dual precursor binder and the surface modification effectively improved the mechanical stability of the layer as shown by higher resistance to mechanical vibration. It was analyzed that the addition of MTES served to enhance the mechanical stability of the adsorbent layer by providing the flexible element, Si-C bonding, in the rigid inorganic matrix. To explain the microstructure analysis by SEM and TEM, and the zeta potential measurement, we proposed a surface reaction model comprising the formation of very thin layer of surface silanol on FAPO particles enhancing the reactivity between the particle and the binder. Both the dual precursor and the surface modification produced no noticeable detrimental effect on the key properties such as water vapor adsorption and thermal conductivity.
机译：在这项研究中，我们使用磷酸铝铁（FAPO）颗粒和无机二氧化硅粘合剂制备了用于吸附热泵的吸附剂层，并对其物理性能进行了表征。在制备吸附剂层时，我们尝试了两种方法：粘合剂的双重前驱体和FAPO颗粒的表面改性。通过使用四乙氧基硅烷（TEOS）和甲基三乙氧基硅烷（MTES）作为双重前体，通过溶胶-凝胶法制备无机二氧化硅粘合剂。通过TEOS分子对FAPO颗粒进行表面改性，以促进颗粒与粘合剂之间的反应性。在疏水溶剂环己烷中仔细进行了形成硅烷单层的表面改性，以防止将水分子供应到溶液中。结果，双重前体粘合剂的使用和表面改性都有效地改善了该层的机械稳定性，这表现为对机械振动的更高抵抗力。据分析，MTES的添加可通过在刚性无机基质中提供柔性元素Si-C键来增强吸附层的机械稳定性。为了解释通过SEM和TEM进行的微观结构分析以及zeta电位测量，我们提出了一种表面反应模型，该模型包括在FAPO颗粒上形成非常薄的表面硅烷醇层，从而增强了颗粒与粘合剂之间的反应性。双重前体和表面改性均未对诸如水蒸气吸附和热导率之类的关键性能产生明显的有害影响。

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