New equations of state for the binary mixtures H₂ + CH₄, H₂ + N₂, H₂ + CO₂, and H₂ + CO are presented. The results are part of an ongoing research project aiming at an improvement of the GERG-2008 model for the description of hydrogen-rich multicomponent mixtures. The equations are formulated in terms of the reduced Helmholtz energy and allow for the calculation of all thermodynamic properties over the entire fluid surface including the gas phase, liquid phase, supercritical region, and equilibrium states. The mathematical structure of the new mixture models corresponds to the form chosen for the reference model GERG-2008 of Kunz and Wagner [J. Chem. Eng. Data 57, 3032 (2012)]. In this way, the equations can be implemented into the existing framework of the GERG-2008 model. The ranges of validity of the new equations correspond to the normal and extended ranges of validity of the GERG-2008 model.

中文翻译：

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含甲烷，氮，一氧化碳和二氧化碳的二元氢混合物的新状态方程

二元混合物H ₂ + CH ₄，H ₂ + N ₂，H ₂ + CO ₂和H _2的新状态方程提出了+ CO。这些结果是正在进行的研究项目的一部分，该项目旨在改进用于描述富氢多组分混合物的GERG-2008模型。这些方程式是根据降低的亥姆霍兹能量来表示的，可以计算整个流体表面上的所有热力学性质，包括气相，液相，超临界区和平衡态。新混合物模型的数学结构与为Kunz和Wagner的参考模型GERG-2008选择的形式相对应[J. 化学 。数据57，3032（2012）]。这样，可以将方程式实现到GERG-2008模型的现有框架中。新方程的有效性范围对应于GERG-2008模型的正常和扩展有效性范围。