Catalytic results for the reductive amination of MEA.

Entry	Catalyst	Conversion (%)	Selectivity (%)
			EDAa	AEEAb	PIPc	DETAd	Otherse
1	Re2–390R	—	—	—	—	—	—
2	Ni15–390R	7.6	40.0	56.2	3.2	0.0	0.6
3	Ni15–Re0.5–390R	22.3	55.6	32.2	5.8	4.3	2.1
4	Ni15–Re1–390R	27.6	60.3	26.2	6.4	4.6	2.5
5	Ni15–Re2–390R	36.6	63.0	20.4	8.1	5.7	2.8
6	Ni15–Re3–390R	37.6	63.6	19.2	8.9	5.2	3.1
7	Ni15–500R	14.5	46.3	37.4	8.5	5.1	2.7
8	Ni15–Re2–500R	43.2	67.7	16.4	8.2	5.5	2.2
9	Ni–Re/Al2O3f	45.4	69.1	12.9	6.6	10.5	0.9
10	Ni–Re/SiO2–Al2O3g	53.0	82.4	9.8	1.1	5.9	0.8
11	Ni15–Re/Al2O3h	50.4	82.1	4.4	5.1	7.7	0.8

^aEthylenediamine.

^bAminoethylethanolamine.

^cPiperazine.

^dDiethylenetriamine.

^e N-(2-Hydroxyethyl)piperazine and N-Aminoethylpiperazine.

^fPatent (US 5750790):²⁶ 170 °C, 12.5 MPa, MEA : NH₃ = 1 : 10.

^gPatent (US 6534441 B1):²⁷ 160 °C, 20.0 MPa, MEA : NH₃ = 1 : 10.

^hThe pilot-scale results of our Ni–Re/Al₂O₃ catalysts: 175 °C, 17.5 MPa, MEA : NH₃ = 1 : 10.