Synergy between a sulfur-tolerant Pt/Al2O3@sodalite core-shell catalyst and a CoMo/Al2O3 catalyst

A remote control model material was developed, which consists of a sulfur-tolerant Pt/Al2O3@sodalite catalyst and a CoMo/Al2O3 catalyst and which combines the concepts of size-selectivity and hydrogen spillover. The Pt/Al2O3@sodalite with core shell structure was prepared by coating a Pt/Al2O3 core with a nanosized sodalite (SOD) shell. The cages of the SOD are sufficiently small (0.3 nm) to exclude the smallest sulfur-containing molecules (hydrogen sulfide, 0.36 nm), while allowing hydrogen molecules (0.289 nm) and atomic hydrogen to diffuse in and out of the cages to allow hydrogen spillover. The Pt/Al2O3@sodalite core-shell material combined with traditional sulfided cobalt molybdenum showed high activity, stability, and high sulfur resistance in the hydrodesulfurization of dibenzothiophene. The Pt/Al2O3@sodalite core-shell material (where hydrogen spillover starts) is used as active hydrogen emission sources, producing active hydrogen and transporting it to the traditional sulfided cobalt molybdenum catalyst (where the spilled over hydrogen is used). (C) 2018 Elsevier Inc. All rights reserved.