The acids in the food begin to attack and dissolve the metal lining of the can, and one of the by-products of this chemical reaction is hydrogen gas.
食品中的酸性物质开始溶解罐的金属内层，这种化学反应会产生氢气。
2
Many factors which may affect the catalytic behavior such as rare earth metal species, calcination temperature, reaction temperature, space speed and feed gas purity were studied.