Preparation method of Pd-M-based metal catalyst for high-purity acetylene hydrogenation for preparing ethylene, and method for preparing ethylene

• Main Authors: WANG FEI, YU HAIPENG, SHI XUEJUN, SHI DONGJUN, WU LIYANG, WU DAOHONG, HUANG WEI, SU ERQIANG, ZHENG QINGQING
• Format: Patent
• Language: Chinese; English
• Published: 21.11.2017
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR RELEVANT APPARATUS; TRANSPORTING

The invention discloses a preparation method of a Pd-M-based metal catalyst for high-purity acetylene hydrogenation for preparing ethylene, and a method for preparing ethylene. The preparation method of the catalyst comprises the following steps: (1) mixing a water-soluble palladium salt, an assistant metal M precursor and water to obtain a mixed solution, wherein the assistant metal M precursor is a water-soluble salt; (2) contacting a carrier with the mixed solution by an equivalent-volume impregnation technology to make metal palladium and the assistant loaded on the carrier; and (3) drying a product obtained in step (2), and carrying out reducing calcination to obtain the Pd-M-based metal catalyst, wherein the reducing calcination is carried out under vacuum diluted hydrogen conditions, and the vacuum diluted hydrogen conditions comprise the vacuum degree of 0.04-0.085 MPa and the hydrogen flow rate of 0.1-10 ml/(gcat.min). The catalyst with the advantages of high active metal dispersiveness and non-agglo