Compositions containing hydrofluoroolefin compounds

Provided is a composition containing an HFO compound in which the decomposition and oxidation of the HFO compound are suppressed, the stability is excellent, and the cooling capacity when used as a heat medium is improved compared to when only the HFO compound is used. Specifically, the present invention provides a composition characterized by containing at least one type of HFO compound selected from the group consisting of HFO-1234yf, (E-/Z-) HFO-1234ze, and (E-/Z-) HFO-1225ye, and a chlorine-containing compound, (1) the chlorine-containing compound being at least one type of compound selected from the group consisting of CH2 = CHCl, CHF = CHCl, CH2 = CFCl, CF3Cl, CH3Cl, CF3CH2Cl, CClF = CHCl, and CHF = CCl2, and (2) the content of the chlorine-containing compound being in the range of 1-500000 ppm by mass. 本发明提供一种含有HFO化合物的组合物，其中HFO化合物的分解、氧化被抑制，稳定性优异，并且，与仅使用HFO化合物的情况相比，作为载热体使用时的致冷能力得到提高。具体而言，本发明提供一种组合物，其特征在于：含有选自HFO－1234yf、(E－/Z－)HFO－1234ze和(E－/Z－)HFO－1225ye中的至少一种HFO化合物与含氯化合物，(1)上述含氯化合物为选自CH2＝CHCl、CHF＝CHCl、