Journal
CHEMCATCHEM
Volume 11, Issue 5, Pages 1526-1533Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.201801976
Keywords
Acetylene hydrogenation; catalyst synthesis; ceria; nickel; selective hydrogenation
Categories
Funding
- U.S. Department of Energy [DE-FG02-05ER15712]
- U.S. Air Force Office of Scientific Research [FA9550-18-1-0413]
- Foundation of Jiangxi Educational Committee, China [GJJ160884]
- National Natural Science Foundation of China [21673040]
- China Scholarship Council [201608360178]
- Fujian Province Scholarship Council
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Metallic nickel is known to be an active, but not a selective hydrogenation catalyst for conversion of alkynes to alkenes. On the other hand, nickel oxide is not active. Recently, we have demonstrated that nickel doped into ceria provides an inexpensive catalyst for selective hydrogenation of acetylene in the presence of ethylene. Here, we evaluate various synthesis methods to achieve optimal selective hydrogenation performance. We examined incipient wetness impregnation, coprecipitation, solution combustion, and sol-gel synthesis to study how the method of preparation affects catalytic structure and behavior. Sol-gel synthesis, coprecipitation, and solution combustion synthesis methods favor nickel incorporation into the ceria lattice, while incipient wetness impregnation creates segregated nickel species on the ceria surface. For hydrogenation of acetylene, these nickel surface species lead to poor ethylene selectivity due to ethane and oligomer formation. However, when nickel is incorporated into the ceria lattice, ethane formation is prevented even while achieving 100 % conversion of acetylene. Coke formation is also significantly reduced on these catalysts compared to conventional nanoparticle counterparts. We conclude that sol-gel synthesis provides the optimal method for creating a uniform dopant distribution within the high surface area ceria.
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