The composite ZSM—5 zeolite/vermiculite catalyst,in which tiny ZSM—5 zeolite parti- cles embedded in the vermiculite substrate,has been synthesized by hydrothermal method with vermiculite as silicon source.The catal...The composite ZSM—5 zeolite/vermiculite catalyst,in which tiny ZSM—5 zeolite parti- cles embedded in the vermiculite substrate,has been synthesized by hydrothermal method with vermiculite as silicon source.The catalytic behavior of resulting catalyst for xylene isomerization,propylene aromatization and toluene disproportionation is better than that of HZSM—5 zeolite.展开更多
After utilizing an improved method for adding a non-precious promoter to the precious Pd/C catalyst during hydrogenation of benzoic acid, a new understanding concerning regeneration of deactivated Pd/C catalyst has be...After utilizing an improved method for adding a non-precious promoter to the precious Pd/C catalyst during hydrogenation of benzoic acid, a new understanding concerning regeneration of deactivated Pd/C catalyst has been obtained, and an improved process has emerged. The improved process can avoid the conventional technical shortcomings related with hydrogenation of benzoic acid such as the quick decline of catalyst activity in a relatively short period of time and low palladium recovery from the spent catalyst. Furthermore, according to this process, cyclohexane carboxylic acid (CCA) can be produced favorably in a commercial scale at a high selectivity and product yield with a extended catalyst life.展开更多
文摘The composite ZSM—5 zeolite/vermiculite catalyst,in which tiny ZSM—5 zeolite parti- cles embedded in the vermiculite substrate,has been synthesized by hydrothermal method with vermiculite as silicon source.The catalytic behavior of resulting catalyst for xylene isomerization,propylene aromatization and toluene disproportionation is better than that of HZSM—5 zeolite.
文摘After utilizing an improved method for adding a non-precious promoter to the precious Pd/C catalyst during hydrogenation of benzoic acid, a new understanding concerning regeneration of deactivated Pd/C catalyst has been obtained, and an improved process has emerged. The improved process can avoid the conventional technical shortcomings related with hydrogenation of benzoic acid such as the quick decline of catalyst activity in a relatively short period of time and low palladium recovery from the spent catalyst. Furthermore, according to this process, cyclohexane carboxylic acid (CCA) can be produced favorably in a commercial scale at a high selectivity and product yield with a extended catalyst life.
