Ruthenium alumina has the characteristics of high selectivity and high stereoselectivity, and is widely used in the petrochemical industry. For example, when purifying hydrogen used in the petrochemical industry, trace CO and CO₂ in hydrogen can be converted into methane, thus protecting the hydrogenation catalyst, avoiding poisoning and failure ‌. In addition, the catalyst is also used in the reaction of DMT hydrogenation to prepare DMCD, showing high conversion and selectivity, mild process conditions, simple equipment, easy to realize industrialization.