Hydrogen generation assemblies and methods of generating hydrogen are disclosed. In some embodiments, the method may include receiving a feed stream in a fuel processing assembly of the hydrogen generation assembly; and generating a product hydrogen stream in the fuel processing assembly from the received feed stream. Generating a product hydrogen stream may, in some embodiments, include generating an output stream in a hydrogen generating region from the received feed stream, and generating the product hydrogen stream in a purification region from the output stream. The method may additionally include receiving the generated product hydrogen stream in a buffer tank of the hydrogen generation assembly; and detecting pressure in the buffer tank via a tank sensor assembly. The method may further include stopping generation of the product hydrogen stream in the fuel processing assembly when the detected pressure in the buffer tank is above a predetermined maximum pressure.

A volume of a reaction chamber is increased to draw a feedstock into the reaction chamber. An energy fluid is flowed into the reaction chamber to mix with the feedstock. As a result of the mixing of the energy fluid with the feedstock, energy is transferred from the energy fluid to the feedstock and causes the feedstock to decompose and form one or more reaction products. The volume of the reaction chamber is decreased to expel the one or more reaction products from the reaction chamber.

A method for synthesizing a MoO.sub.3@Al.sub.2O.sub.3MgO nanocomposite material incudes adding distilled water and ammonium molybdate to a powder mixture of Al(NO.sub.3).sub.3.Math.9H.sub.2O, Mg(Ac).sub.2.Math.4H.sub.2O, and sucrose to form a reaction mixture and heating the reaction mixture to a reaction temperature in a range of 150 C. to 220 C. to form a carbonized product. The method further includes grinding the carbonized product to form a ground carbonized product and calcining the ground carbonized product at a temperature of about 700 C. to 800 C. for a period of 2 to 4 hours to form the MoO.sub.3@Al.sub.2O.sub.3MgO nanocomposite material. The MoO.sub.3 content of the MoO.sub.3@Al.sub.2O.sub.3MgO nanocomposite material ranges from 1 wt. % to 20 wt. % and the MoO.sub.3@Al.sub.2O.sub.3MgO nanocomposite material has a hydrogen generation rate of greater than or equal to 400 mL.Math.min.sup.1.Math.g.sup.1, when used to generate hydrogen from NaBH.sub.4.