Abstract
In this paper, a molecular sieve (VSiO(2)) prepared from modified vermiculite is used as a support, and a multilayer mesoporous catalyst, Ni-VSiO(2), is prepared while the active components are loaded in one step by the precipitation method. The catalyst is further modified by adding additives Ca and Ce to prepare the catalyst Ni-5x-VSiO(2) (x = Ce, Ca) and is used for the dry reforming of methane reaction. The catalyst is characterized by X-ray fluorescence, Brunauer-Emmett-Teller analysis, scanning electron microscopy, hydrogen temperature-programmed reduction test, transmission electron microscopy, thermogravimetric analysis, and other technical means. The result shows that under a normal pressure of 750 °C, the catalyst Ni-Ca-VSiO(2) has good stability. The catalyst Ni-Ce-VSiO(2) has good activity, stability and carbon deposition resistance, and the conversion rates of CO(2) and CH(4) are 88% and 78%, respectively. This is because the mesoporous structure allows Ni nanoparticles to enter the pores of the catalyst support, thereby inhibiting the aggregation of the active component Ni and improving its sintering resistance. CeO(2) additives provide more oxygen vacancies to inhibit the formation of carbon deposits. At the same time, the strong interaction between the active component Ni and the additive CeO(2) is also beneficial to improve its sintering resistance.