The reducibility of Ni(II) ions in silicoaluminophosphate-11 (NiH-SAPO-11) formed by partial ion exchange of H(I) by Ni(II) was studied by Fourier transform infrared and electron spin resonance spectroscopies. After slow dehydration at temperatures above 473 K under vacuum a Ni(I) species is observed. This Ni(I) species is produced by reduction of Ni(II) by hydroxyl groups and is thermally stable under vacuum at 873 K. Ni(I) is also produced by reduction via gamma-irradiation at 77 K. The location of the Ni(I) species was determined by P-31 and Al-27 electron spin echo modulation and found to have two locations depending on the dehydration temperature. For dehydration at 473 K Ni(I) is in a 10-ring channel near a 6-ring window. For dehydration at 773 K the Ni(I) is located in the center of a hexagonal prism.