Table 2. Catalytic activity in the decomposition of formaldehyde/water mixtures by Ru complexes^*.

Entry	Catalyst	KOH (equivalents)	TOF50 (h−1)†	Total yield H2 (%)‡	TONmax/duration§
1	1K	—	—	23	115/12 h
2||	1K	2	8,109	56	280/12 h
3||	1K	6	17,500 (first load)	86	430/2 h
4	1K		— (second load)	12	103/2 h
5||	1Aa	6	15,101 (first load)	90	450/12 min
6¶	1Aa	6	12,000 (sixth load)	59	1,787/20 min
7||	1Ab	6	13,520	81	405/15 min
8||	4	6	17,000	90	450/2 h
9	5H2	6	6,000	68	340/4 h
10||	5	6	7,500	75	375/4 h
11||	3a	4	3,537	58	290/4 h
12||	6	4	750	69.5	347/4 h
13||	7	4	4,091	65	325/4 h
14#	1Aa	6	29,764 (first load)	90	450/15 min
15**	1Aa	6	22,000 (second load)	85	765/15 min
16††	1Aa	6	805	92	460/2 h
17‡‡	1Aa	6	—	<5	—/12 h

^*Reaction conditions: formaldehyde (1.0 mmol) c₀=0.47 M, 0.4 mol% [Ru] at 60 °C in water/THF (10:1).

^†TOF values after 50% conversion (1 equivalents H₂ released per formaldehyde unit).

^‡Yield considering 2 equivalents H₂/equivalent HCOH.

^§TON=mmol H₂released per mmol [Ru].

^||Values are an average of three catalytic runs.

^¶Final value after the sixth addition of HCOH aq. to the reaction mixture of entry 5.

^#Paraformaldehyde (1.0 mmol) c₀=0.47 M, 0.4 mol% [Ru] at 60 °C in water/THF (10:1).

^**Final value after the second addition of HCOH to the reaction mixture of entry 14. Average of three runs.

^††Same conditions as in entry 14 under CO_(g) atmosphere. Average of three runs.

^‡‡Same conditions as in entry 16 under air. Average of two runs.