摘要
The roles of adsorbed oxygen and lattice oxygen on the surface of VPO catalyst for n butane selective oxidation were experimentally studied by using on line mass spectroscopy (MS) transient response measurement in a fixed bed micro reactor. The results showed that the lattice oxygen led to selective oxidation,while adsorbed oxygen led to deep oxidation. Gaseous oxygen could be adsorbed on the surface of the VPO catalyst and transformed to lattice oxygen but did not directly participate in selective oxidation. The diffusion of lattice oxygen from the bulk phase to the surface might be the rate controlling step of unsteady state oxidation when n butane selective oxidation and VPO catalyst re oxidation were performed separately.Increasing the diffusion rate of the lattice oxygen and usable lattice oxygen capacity in VPO catalyst could remarkably improve the reaction performance in a fixed bed reactor.
The roles of adsorbed oxygen and lattice oxygen on the surface of VPO catalyst for n -butane selective oxidation were experimentally studied by using on-line mass spectroscopy (MS) transient response measurement in a fixed bed micro-reactor. The results showed that the lattice oxygen led to selective oxidation, while adsorbed oxygen led to deep oxidation. Gaseous oxygen could be adsorbed on the surface of the VPO catalyst and transformed to lattice oxygen but did not directly participate in selective oxidation. The diffusion of lattice oxygen from the bulk phase to the surface might be the rate-controlling step of unsteady state oxidation when n-butane selective oxidation and VPO catalyst re-oxidation were performed separately. Increasing the diffusion rate of the lattice oxygen and usable lattice oxygen capacity in VPO catalyst could remarkably improve the reaction performance in a fixed bed reactor.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2003年第6期854-858,共5页
CIESC Journal
基金
国家自然科学基金委
中国石油化工集团公司联合资助重大基金项目 (No 2 9792 0 70 )~~
