Table 3.

Storage capacity of hydrogen hydrate for different promotors^a

Promotor	Promotor concentration (Mol%)	Operating temperature (K)	Operating pressure (MPa)	Hydrogen storage capacity (wt.%)	Label	Reference
THF	3	273.15	14.53	1.875	t	(Cai et al., 2019)
None		250 250	150 450	3.8 4.2	a	(Zhdanov et al., 2019)
CP DHF DXL THP THT THF	5.6 5.6 5.6 5.6 5.6 5.6	278.4 271.5 269.2 272.3 274.5 276.2	10 10 10 10 10 10	0.11 0.16 0.36 0.19 0.5 0.12	k h g e	(Di Profio et al., 2018)
THF THF/carbon THF THF/carbon THF THF/carbon	5 5/70g 5 5/70g 5 5/70g	274 274 274 274 274 274	6.4 6.4 7.4 7.4 8.4 8.4	0.026 0.041 0.033 0.048 0.037 0.082		(Fang et al., 2014)
TBAOH	0.0323	290	20	0.47	f	(Karimi et al., 2014)
THF TBAB	3.5 3.5	279.2 279.2	12 12	0.169 0.052	r	(Veluswamy et al., 2014a)
C2H6 C2H6 C2H6 C2H6 C2H6 C2H6	1 1 1 5 5 5	250 250 250 250 250 250	25 100 250 25 100 250	0.5 1.6 2.4 0.2 0.7 1.25	w	(Belosludov et al., 2012)
THT THT THT Furan Furan Furan	5 5 5 5 5 5	275.1 275.1 275.1 275.1 275.1 275.1	15.4 32 41.8 15.5 32 41.8	0.25 0.43 0.6 0.23 0.47 0.59	n o	(Tsuda et al., 2009)
TBAB TBAB TBAB	1 3 6	279.5 279.5 279.5	13.8 13.8 13.8	0.1 0.22 0.048	p	(Strobel et al., 2007b)
THF THF	2 5.6	270 270	13.8 13.8	0.43 0.438	s	(Strobel et al., 2006)
TBAF TBAF	3.4 1.8	294 294	10 10	0.45 0.34	x	(Trueba et al., 2013)
Ar Ar	1 0.5	235 235	25 50	1.7 2.8	y z	(Zhdanov et al., 2017)
MCH MCH	0.4 1.6	273 274	149 25	1.38 0.6	c q	(Papadimitriou et al., 2008)
${\text{TBPBH}}_4$ TBAOH	2 2.5	285 285	12.1 12.1	0.12 0.14	j i	(Dolotko et al., 2011)
THF	3	255	75	3.44	b	(Sugahara et al., 2010)
TBAB	4	287	16	0.6	d	(Strobel et al., 2009)
THF THF THF THF	5.6 5.6 5.6 5.6	277.15 277.15 277.15 277.15	31.9 10.1 40.5 66.4	0.51 0.19 0.615 0.835	l m	(Ogata et al., 2008)
THF	2	269.5	3.6	0.18	r	(Nagai et al., 2008)
TBABh	4	100	0.1	0.07	t	(Shin et al., 2009)
DMCH MTBE	3 5	275 273	60 70	0.85 0.94	u v	(Martín and Peters, 2009)

^aThe labels in the table correspond to the bars in Figure 8.