Hydrated alumina forming matter and preparation method thereof, alumina forming matter, catalyst and preparation method and application thereof and hydrotreating method

The invention provides a hydrated alumina forming matter and a preparation method and application thereof, the hydrated alumina forming matter is prepared from raw materials comprising at least one hydrated alumina, at least one lithium containing compound and at least one cellulose ether, the water absorption rate of the forming matter is 0.4 - 1.5, the delta value is less than 10%, and Q1 is more than 12N/mm. The invention also provides an alumina forming matter and application thereof, the alumina forming matter is prepared by roasting the hydrated alumina forming matter of the invention. The invention further provides a catalyst prepared by using the hydrated alumina forming matter or the alumina forming matter as a carrier and having hydrogenation catalysis effect and a preparation method and application thereof. The invention also provides a hydrocarbon oil hydrotreating method using the catalyst. The alumina forming matter has high strength and strength retention. The catalyst shows a higher catalytic activity in hydrocarbon oil hydrotreating.