The palladium/kieselguhr composites(Pd/K)were prepared by the PdCl_(2) dipping-reducing method.The effects of the preparation conditions on the Pd/K were studied,such as the heat treatment,dipping time,palladium conce...The palladium/kieselguhr composites(Pd/K)were prepared by the PdCl_(2) dipping-reducing method.The effects of the preparation conditions on the Pd/K were studied,such as the heat treatment,dipping time,palladium concentration in solution and number of loading cycles.The pore structure and palladium content of the Pd/K were measured by the Brunauer-Emmett-Teller method and an inductively coupled plasma mass spectrometry.The appearance and palladium element distribution were measured by a scanning electron microscope.It is found that the palladium element is more densely distributed in the irregular and porous parts of the kieselguhr particles,so the kieselguhr is superior to Al_(2)O_(3) as the carrier material.The heat treatment can improve the pore permeability and increase the palladium content for the Pd/K.Increasing the dipping time,palladium concentration in solution and number of loading cycles is beneficial to increase the palladium content of the Pd/K,but more loading cycles may lead to the pore collapse,which obstructs the interaction with the hydrogen isotope gases.A kind of Pd/K was prepared under a set of optimized conditions and was packed in a separation column.This Pd/K was proved to be of high performance and durable by some hydrogen-deuterium separation experiments.展开更多
以不同的添加方式在Ni K MoS2催化剂中加入Mn助剂,考察其合成醇反应性能。结果表明,Mn Ni K MoS2催化剂具有较好的合成低碳混合醇反应性能。共沉淀法以醋酸锰为前驱体加入0 26%的Mn助剂后,C+2醇含量,醇时空产率及选择性均明显提高;分步...以不同的添加方式在Ni K MoS2催化剂中加入Mn助剂,考察其合成醇反应性能。结果表明,Mn Ni K MoS2催化剂具有较好的合成低碳混合醇反应性能。共沉淀法以醋酸锰为前驱体加入0 26%的Mn助剂后,C+2醇含量,醇时空产率及选择性均明显提高;分步沉淀法使Mn的加入量增加到0 66%,醇时空产率明显增加。以浸渍法按化学计量加入Mn助剂考察其含量对催化剂合成醇性能的影响,当Mn Mo(原子比)为1 5时,反应条件为315℃,9 5MPa,6000h-1,醇时空产率和醇选择性分别达到最高值0 338g mL·h和69 6%。300h的稳定性测试结果表明,共沉淀法改性的催化剂具有良好的稳定性。展开更多
基金financially supported by the National Natural Science Foundation of China(22109145)the Foundation of Science and Technology on Surface Physics and Chemistry Laboratory(WDZC202202)the Natural Science Foundation of Sichuan Province(2024NSFTD0018)。
文摘The palladium/kieselguhr composites(Pd/K)were prepared by the PdCl_(2) dipping-reducing method.The effects of the preparation conditions on the Pd/K were studied,such as the heat treatment,dipping time,palladium concentration in solution and number of loading cycles.The pore structure and palladium content of the Pd/K were measured by the Brunauer-Emmett-Teller method and an inductively coupled plasma mass spectrometry.The appearance and palladium element distribution were measured by a scanning electron microscope.It is found that the palladium element is more densely distributed in the irregular and porous parts of the kieselguhr particles,so the kieselguhr is superior to Al_(2)O_(3) as the carrier material.The heat treatment can improve the pore permeability and increase the palladium content for the Pd/K.Increasing the dipping time,palladium concentration in solution and number of loading cycles is beneficial to increase the palladium content of the Pd/K,but more loading cycles may lead to the pore collapse,which obstructs the interaction with the hydrogen isotope gases.A kind of Pd/K was prepared under a set of optimized conditions and was packed in a separation column.This Pd/K was proved to be of high performance and durable by some hydrogen-deuterium separation experiments.
文摘以不同的添加方式在Ni K MoS2催化剂中加入Mn助剂,考察其合成醇反应性能。结果表明,Mn Ni K MoS2催化剂具有较好的合成低碳混合醇反应性能。共沉淀法以醋酸锰为前驱体加入0 26%的Mn助剂后,C+2醇含量,醇时空产率及选择性均明显提高;分步沉淀法使Mn的加入量增加到0 66%,醇时空产率明显增加。以浸渍法按化学计量加入Mn助剂考察其含量对催化剂合成醇性能的影响,当Mn Mo(原子比)为1 5时,反应条件为315℃,9 5MPa,6000h-1,醇时空产率和醇选择性分别达到最高值0 338g mL·h和69 6%。300h的稳定性测试结果表明,共沉淀法改性的催化剂具有良好的稳定性。
