ELEMENTAL EVALUATION OF H-S-1 FOR RESOURCE-EFFICIENT CO₂-TO-METHANOL TECHNOLOGY

Carbon dioxide conversion into methanol represents a technologically relevant approach to 
treating CO₂ as a carbon-containing raw material rather than only as an emission stream. 
This study evaluates the elemental composition of a laboratory-prepared H-S-1 (hollow 
silicalite-1) support intended for subsequent Cu–ZnOₓ loading and CO₂ hydrogenation to 
methanol, with emphasis on material purity and resource-efficient catalyst development. 
According to the supplied laboratory regulation, S-1 is selectively recrystallized in 0.30 M 
tetrapropylammonium hydroxide at 170 °C for 72 h, followed by washing, drying and 
calcination. X-ray fluorescence analysis using a Rigaku NEX CG instrument showed 90.3 
mass% SiO₂ and 0.883 mass% Al₂O₃, corresponding to a SiO₂/Al₂O₃ molar ratio of about 
173.5 and an atomic Si/Al ratio of about 86.8. Minor components included SO₃ (1.09 
mass%), ZrO₂ (0.103 mass%), Fe₂O₃ (0.0845 mass%) and TiO₂ (0.0703 mass%), while NiO, 
CuO and ZnO were present only at trace levels. The high-silica composition supports further 
evaluation of H-S-1 as a low-acidity carrier. However, sodium was not reported and must 
be quantified separately, while XRD and TEM/STEM are required to confirm MFI 
crystallinity and hollow morphology. The present results establish a chemical-quality 
checkpoint for an environmental technology aimed at CO₂ utilization; catalytic carbon 
conversion, energy demand and life-cycle environmental benefits remain subjects for 
subsequent study.