Original ResearchPublished 26 June 2026Tuning of Ni metallic sites over strontium hydroxyapatite nanorods for syngas methanationPutrakumar Balla · Prem Kumar Seelam · Daeseob Shin · Junghoon Lee · Rajender Boddula · Ulla Lassi · Sungtak KimFrontiers in Catalysisdoi 10.3389/fctls.2026.1858472