An eco-friendly process for making dimethyl carbonate comprising contacting methanol with carbon dioxide in the presence of a solid, calcined catalyst derived from zirconium phosphonate catalyst having molecular formula: Zr2-nYn. A lenticular sheet is affixed in intimate juxtaposition with a display area having a defined aspect ratio. The catalyst precursor, when combined with an activating cocatalyst, is useful for the polymerization of olefins. The neutron porosity tool is augmented with a gamma ray detector configured to measure the rate at which hydrogen nuclei capture neutrons from a neutron source.